International Journal of Recent Technology and Engineering (IJRTE) ISSN: 2277-3878, Volume-8 Issue-4, November 2019

Optimal Generation of Output for Industrial Motors using Variable Frequency Drive and Gearbox Drive

S.Joseph Francis, S.Karthikeyan, S.Balasundaram, L.Kalaivani, M.Gengaraj,

 used to control the drive speed by decreasing the frequency Abstract: This paper depicts the exploration of output torque of and the appropriate voltage to satisfy the requirement of reduction drive and variable frequency drive (VFD) with electric motor load. If any application required the speed detailed analysis report for the various load conditions. The right requirement, as VFD can increase or decrease the motor selection of VFD will depend on the load requirement and application. The higher the load therefore more torque needed in speed to meet the specified speed requirement. [2]. an application, the higher the current draw of the motor will be. In order to reduce the mechanical components and to Since VFDs are rated by their continuous output current (amps), improve the overall maintenance, the VFD is proficient it is important to select a drive with adequate current to the motor to changing the output speed of the drive without the for optimal performance. The property of Torque is converse effect of gear reduction. By means of gear ratio, the output torque need for any mechanical pulleys. Though, VFD has a is increased by developing the torque with reduced efficiency distinct feature that it has the capability to save the losses. On the other hand, in some applications the gear reduction economy of the user through its unique nature to save play a vital role in reduces the speed while increase the torque and energy by controlling only the power that is required for in many other applications it uses to increase speed with reduced the application. By means of power conversion only, a VFD torque. In recent era, many industrial drives are designed as such can accomplish. As like traditional electric motor, a VFD is that to run at 60% to 100% of rated load. In this scenario the drive would get optimum efficiency is generally obtained nearly 75% of attached, that convert the power to the usable form. The rated load. Thus, a 20 (HP) electric drive has a principle behind the induction motor in which the electrical satisfactory load range of 12 to 20 HP with optimum efficiency is supply is given to its stator and the given input electrical at 7.5 HP. A motor’s efficiency tends to decrease dramatically power is converted to mechanical output power through the below about 50% load. Hence it’s very important to choose the rotating magnetic field and that produced torque by means of drive for the proper application with different loading conditions. slip. In other words a VFD, will convert its incoming power,

a fixed voltage, and frequency, to a variable voltage and Keywords: Torque coefficient, Variable frequency drive, Load, frequency [3]. This feature of VFD is used to vary the speed I. INTRODUCTION of the industrial drive without the need any additional mechanical pulleys of gearboxes. The fig. 1 shows the block diagram of variable frequency drive fed motor. n modern era, the Variable Frequency Drive (VFD) is I finding a variety of applications over the industrial field. It is used to drive the industrial electric motor by controlling the frequency and voltage applied to the motor. Simply it s a type of motor controller that controls the performance parameter of the industrial drive. VFD can be otherwise called as adjustable speed drive, adjustable frequency drive, AC drive, micro drive, and inverter depends upon the application where it is used [1]. The relationship between the Frequency (Hz) and the motor’s speed (RPMs) is linear in other words it is directly proportional. In general, if the Fig. 1. Block Diagram of VFD. frequency is faster this yields the motor speed as faster. If any application which doesn’t require the rated speed the VFD is The vital reason to acquire the VFD is speed control. The major advantage of this type of speed control is for the purpose to process, operation and economic benefits with Revised Manuscript Received on November 15, 2019 proper energy consumption. While considering maintenance * Correspondence Author the VFD is the suitable choice because it not having any S.Joseph Francis, EEE Department, National Engineering College, Kovilpatti, India. Email: [email protected] carbon brushes or mechanical components like pulleys and S.Karthikeyan, EEE Department, National Engineering College, gearboxes etc., Fans and Pumps are the apparent profitable Kovilpatti, India. Email: [email protected] benefits of VFDs. The relationship of the power and velocity S.Balasundaram, EEE Department, National Engineering College, that a pump or fan consumes is directly proportional to the Kovilpatti, India. Email: [email protected] Dr.L.Kalaivani*, EEE Department, National Engineering College, cube of the velocity. For Kovilpatti, India. Email: [email protected] example, if a consumer can run M.Gengaraj, EEE Department, National Engineering College, a fan at 80% of full speed; it Kovilpatti, India.,. Email: [email protected]

Retrieval Number: D8195118419/2019©BEIESP Published By: DOI:10.35940/ijrte.D8195.118419 Blue Eyes Intelligence Engineering 12147 & Sciences Publication

Optimal Generation of Output Torque for Industrial Motors using Variable Frequency Drive and Gearbox Drive hypothetically uses 51% of full load power [4]. C. Determinations of Motor loading At rated load, many conventional electrical drives are II. VARIABLE FREQUENCY DRIVE develop to run at 50% to 100% of rated load. About the half A. Correlation of Voltage and Frequency of the rated load the motor’s efficiency is considerably At rated frequencies, if the applied frequency of an Induction decreased. On the other hand, the choice of good efficiency motor is reduced, the applied voltage also should reduced to should ranges with individual motor drives and it will extend suppress the current drawn by the motor. over a wide range for large larger motors which is shown in (The inductive reactance of an AC magnetic circuit is directly fig 3. While the efficiency reduces significantly with reduced load, the motor drive is considered under loaded. [7]. proportional to the frequency according to the formula XL = 2πfL. Where: f = frequency in hertz, and L= inductive reactance in Henry)

Fig. 3. Motor Efficiency ( as a function of % full load efficiency) The motor get overheat and it will lose some efficicecy it may called as overloaded motors. A service factor has been fixed for many industrial drives which allows intermittent overlaoding. Service factor is a value which indicates the motor overloading condtion under ideal situations. If we take, 20-hp motor with a 1.2 service factor can handle an 24 hp Fig. 2. Relationships of VFD with constant load for minimum periods without sustaining considerable torque and constant power with various damage. However many motors continously running above frequencies the rated load with the service factor of 1.15 which results in Fig. 2 shows the relationship between the frequency versus effeiciency and life span of motor decreases. When the voltage is below nominal value and the cooling is weaken by torque and power. In order to evaluate the relationship ratio elevation, high ambiernt heat or dirty motor surfaces the the applied voltage applied to the motor should divided by motor should be never operated. rated frequency. The ratio should be low at low frequencies and it will increased as the frequency increases.[5] To III. GEAR BOX maintain the constant volts/hertz ratio throughout the range several methods are adopted to adjusts the output voltage A. Gearbox Setup waveform such as microprocessor control , PWM control by are the device which used to reduce the output speed simultaneously change the voltage and frequency. For the while increased the torque value for the electric motor drive above rated frequency, the voltage is kept constant for the or to obtain the required result. [8]. many AC variable speed drives. B. Calculation of Horse power for the Drive Power = Work / Time Power = (Force X Distance) / Time The power value of the drive has been calculated from the torque and speed of the motor. For example, if the drive motor have speed of 2000 RPM then the horsepower is calculated below. Horse power = (2,000 X 6) / 63,025 = 0.190 Here the constant value 63025 is a common constant which makes the unit conversion. [6]. This common constant has been obtained using the 33,000 ft-lbs /min = 1 horsepower. Though horsepower units are a derivative of the 33,000 Fig. 4. Gearbox setup arrangement for Motor ft-lbs/min, for the given speed and torque, it is not significant to accepting how to calculate motor horsepower. Watts is the common unit used for power. The conversion from watts to horsepower is 745.7 watts = 1 hp.

Published By: Retrieval Number: D8195118419/2019©BEIESP Blue Eyes Intelligence Engineering DOI:10.35940/ijrte.D8195.118419 12148 & Sciences Publication International Journal of Recent Technology and Engineering (IJRTE) ISSN: 2277-3878, Volume-8 Issue-4, November 2019

The fig.4 shows the reduction of Gear exclusively refers to Fig. 5. Experimental setup of VFD fed Induction motor the speed of the rotary ; by dividing of gear ratio Table- I: Specifications greater than 1:1 the rotational speed of the rotary machine is Parameter Induction Motor VFD reduced. With fewer numbers of teeth meshes and drives a Type 3 phase 3 phase large gear it need increased number of teeth. Voltage 415 V 415 V B. Reduction of Gearbox Current 7.6 A 8 A Frequency 50 Hz 50 Hz The property of Torque is converse effect of gear reduction. By means of gear ratio, the output torque is Power 5 HP 9.7kVA increased by developing the torque with reduced efficiency losses. On the other hand, in some applications the gear The table I represents the specifications of Induction motor reduction play a vital role in reduces the speed while increase as well as VFD for the proposed methodology. The power the torque and in many other applications it uses to increase taken by the VFD is also reported. From these readings, the gear ratio required for gears and torque required for different speed with reduced torque. [9] The fig4. Shows the electrical speeds are also calculated and listed in Table II and III. The used in wind turbines which use gear reduction in torque can be calculated for 80% of full load with the current this manner to convert a relatively slow turbine blade speed value of 5.5A. The VFD and Gearbox torque are calculated to a high speed capable of generating electricity. These for various frequencies from 10Hz to 60Hz and the applications use gearboxes that are assembled opposite of corresponding power and speed can be recorded and those in applications that reduce speed and increase torque tabulated in Table IV. [10]. 푃 푇표푟푞푢푒 = 표푢푡 2휋푁 IV. EXPERIMENTAL RESULTS 60 Where N= Speed of the motor Load test has been conducted in 3 phase Induction Motor 푃표푢푡 = Output power of Induction at various load such as 80%, 60% and 40 % of full Motor load torques at Electrical Machines Laboratory and the 푅푎푡푒푑 푆푝푒푒푑 푆푝푒푒푑 푅푎푡푖표 = 푎푡 50퐻푧 readings are tabulated. 푅푢푛 푛푖푛푔 푆푝푒푒푑

푃표푤푒푟 표푓 퐺푒푎푟 = 푇표푟푞푢푒퐺푒푎푟 푋 퐴푛푔푢푙푎푟 푉푒푙표푐푖푡푦

80% of full load torque: Table- II: Output Torque and Power for various frequencies Sl. No. Frequency I/P Power - Speed in Speed Ratio Torque - Torque- Output (Hz) VFD RPM VFD Gear Power - Gear Watts N-Mt N-Mt Watts 1 10 720 315 4.72 21.26 100.43 3311.12 2 12 880 370 4.02 21.26 85.50 3311.12 3 14 960 412 3.61 21.26 76.78 3311.12 4 16 1200 482 3.09 21.26 65.63 3311.12 5 18 1240 548 2.72 21.26 57.73 3311.12 6 20 1320 607 2.45 21.26 52.12 3311.12 7 22 1400 667 2.23 21.26 47.43 3311.12 8 24 1520 726 2.05 21.26 43.57 3311.12 9 26 1640 779 1.91 21.26 40.61 3311.12 10 28 1832 838 1.78 21.26 37.75 3311.12

Retrieval Number: D8195118419/2019©BEIESP Published By: DOI:10.35940/ijrte.D8195.118419 Blue Eyes Intelligence Engineering 12149 & Sciences Publication

Optimal Generation of Output Torque for Industrial Motors using Variable Frequency Drive and Gearbox Drive

11 30 1840 909 1.64 21.26 34.80 3311.12 12 32 2080 968 1.54 21.26 32.68 3311.12 13 34 2160 1029 1.45 21.26 30.74 3311.12 14 36 2248 1.37 1084 21.26 29.18 3311.12 15 38 2400 1.31 1135 21.26 27.87 3311.12 16 40 2640 1.22 1218 21.26 25.97 3311.12 17 42 2640 1.17 1269 21.26 24.93 3311.12 18 44 2680 1.12 1324 21.26 23.89 3311.12 19 46 2920 1.07 1392 21.26 22.73 3311.12 20 48 3040 1.03 1440 21.26 21.97 3311.12 21 50 2960 1.00 1488 21.26 21.26 3311.12 22 52 3200 0.95 1563 21.26 20.24 3311.12 23 54 3280 0.91 1627 21.26 19.44 3311.12 24 56 3320 0.89 1680 21.26 18.83 3311.12 25 58 3360 0.85 1759 21.26 17.98 3311.12 26 60 3520 0.82 1805 21.26 17.53 3311.12 60% of full load torque: Table- III: Output Torque and Power for various frequencies Sl. No. Frequency I/P Power - Speed in Speed Ratio Torque - Torque- Output (Hz) VFD RPM VFD Gear Power - Gear Watts N-Mt N-Mt Watts 1 10 560 315 4.72 16.13 76.20 2512.15 2 12 520 370 4.02 16.13 64.87 2512.15 3 14 640 412 3.61 16.13 58.26 2512.15 4 16 840 483 3.08 16.13 49.69 2512.15 5 18 880 548 2.72 16.13 43.80 2512.15 6 20 1040 607 2.45 16.13 39.54 2512.15 7 22 1040 667 2.23 16.13 35.98 2512.15 8 24 1240 726 2.05 16.13 33.06 2512.15 9 26 1280 776 1.92 16.13 30.93 2512.15 10 28 1440 838 1.78 16.13 28.64 2512.15 11 30 1520 909 1.64 16.13 26.40 2512.15 12 32 1680 968 1.54 16.13 24.79 2512.15 13 34 1600 1029 1.45 16.13 23.33 2512.15 14 36 1760 1.37 1084 16.13 22.14 2512.15 15 38 1880 1.31 1135 16.13 21.15 2512.15 16 40 2040 1.23 1212 16.13 19.80 2512.15 17 42 2080 1.17 1269 16.13 18.91 2512.15 18 44 2160 1.12 1324 16.13 18.13 2512.15 19 46 2240 1.07 1392 16.13 17.24 2512.15 20 48 2320 1.03 1442 16.13 16.64 2512.15 21 50 2280 1.00 1488 16.13 16.13 2512.15 22 52 2360 0.95 1563 16.13 15.36 2512.15 23 54 2480 0.91 1627 16.13 14.75 2512.15 24 56 2560 0.89 1680 16.13 14.29 2512.15 25 58 2600 0.85 1759 16.13 13.64 2512.15 26 60 2720 1805 0.82 16.13 13.30 2512.15

Published By: Retrieval Number: D8195118419/2019©BEIESP Blue Eyes Intelligence Engineering DOI:10.35940/ijrte.D8195.118419 12150 & Sciences Publication International Journal of Recent Technology and Engineering (IJRTE) ISSN: 2277-3878, Volume-8 Issue-4, November 2019

40% of full load torque: Sl. Frequency I/P Power Speed Speed Torque - Torque- Output No. (Hz) - VFD in Ratio VFD Gear Power - RPM Gear Watts N-Mt N-Mt Watts 1 10 380 320 4.73 10.14 47.94 1605.78 2 12 480 375 4.03 10.14 40.91 1605.78 3 14 480 412 3.67 10.14 37.24 1605.78 4 16 480 486 3.11 10.14 31.57 1605.78 5 18 500 548 2.76 10.14 28.00 1605.78 6 20 520 607 2.49 10.14 25.27 1605.78 7 22 620 665 2.28 10.14 23.07 1605.78 8 24 720 726 2.08 10.14 21.13 1605.78 9 26 800 776 1.95 10.14 19.77 1605.78 10 28 980 838 1.81 10.14 18.31 1605.78 11 30 960 906 1.67 10.14 16.93 1605.78 12 32 1040 968 1.56 10.14 15.85 1605.78 13 34 1040 1029 1.47 10.14 14.91 1605.78 14 36 1160 1084 1.40 10.14 14.15 1605.78 15 38 1200 1135 1.33 10.14 13.52 1605.78 16 40 1240 1196 1.27 10.14 12.83 1605.78 17 42 1300 1258 1.20 10.14 12.20 1605.78 18 44 1420 1319 1.15 10.14 11.63 1605.78 19 46 1440 1383 1.09 10.14 11.09 1605.78 20 48 1360 1436 1.05 10.14 10.68 1605.78 21 50 1160 1513 1.00 10.14 10.14 1605.78 22 52 1292 1561 0.97 10.14 9.83 1605.78 23 54 1512 1618 0.94 10.14 9.48 1605.78 24 56 1608 1675 0.90 10.14 9.16 1605.78 25 58 1720 1757 0.86 10.14 8.73 1605.78 26 60 1680 1805 0.84 10.14 8.50 1605.78

Consolidated Experimental Results: Table- IV: Consolidated Torque Values for different speed 80% of FL Torque 60% of FL Torque 40 % of FL Torque 80% of FL Torque 60% of FL Torque 40 % of FL Torque Speed in Torque- Torque- Torque- Torque- Torque- Torque- Power- Power- Power- Power- Power- Power- RPM VFD Gear VFD Gear VFD Gear VFD Gear VFD Gear VFD Gear N-Mt N-Mt N-Mt N-Mt N-Mt N-Mt N-Mt N-Mt N-Mt N-Mt N-Mt N-Mt 315 21.26 100.43 16.13 76.20 10.14 47.94 720 3311.12 560 2512.2 380 1605.78 370 21.26 85.50 16.13 64.87 10.14 40.91 880 3311.12 520 2512.2 480 1605.78 412 21.26 76.78 16.13 58.26 10.14 37.24 960 3311.12 640 2512.2 480 1605.78 482 21.26 65.63 16.13 49.69 10.14 31.57 1200 3311.12 840 2512.2 480 1605.78 548 21.26 57.73 16.13 43.80 10.14 28.00 1240 3311.12 880 2512.2 500 1605.78 607 21.26 52.12 16.13 39.54 10.14 25.27 1320 3311.12 1040 2512.2 520 1605.78 667 21.26 47.43 16.13 35.98 10.14 23.07 1400 3311.12 1040 2512.2 620 1605.78 726 21.26 43.57 16.13 33.06 10.14 21.13 1520 3311.12 1240 2512.2 720 1605.78 779 21.26 40.61 16.13 30.93 10.14 19.77 1640 3311.12 1280 2512.2 800 1605.78 838 21.26 37.75 16.13 28.64 10.14 18.31 1832 3311.12 1440 2512.2 980 1605.78 909 21.26 34.80 16.13 26.40 10.14 16.93 1840 3311.12 1520 2512.2 960 1605.78 968 21.26 32.68 16.13 24.79 10.14 15.85 2080 3311.12 1680 2512.2 1040 1605.78 1029 21.26 30.74 16.13 23.33 10.14 14.91 2160 3311.12 1600 2512.2 1040 1605.78 1084 21.26 29.18 16.13 22.14 10.14 14.15 2248 3311.12 1760 2512.2 1160 1605.78

Retrieval Number: D8195118419/2019©BEIESP Published By: DOI:10.35940/ijrte.D8195.118419 Blue Eyes Intelligence Engineering 12151 & Sciences Publication

Optimal Generation of Output Torque for Industrial Motors using Variable Frequency Drive and Gearbox Drive

1135 21.26 27.87 16.13 21.15 10.14 13.52 2400 3311.12 1880 2512.2 1200 1605.78 1218 21.26 25.97 16.13 19.80 10.14 12.83 2640 3311.12 2040 2512.2 1240 1605.78 1269 21.26 24.93 16.13 18.91 10.14 12.20 2640 3311.12 2080 2512.2 1300 1605.78 1324 21.26 23.89 16.13 18.13 10.14 11.63 2680 3311.12 2160 2512.2 1420 1605.78 1392 21.26 22.73 16.13 17.24 10.14 11.09 2920 3311.12 2240 2512.2 1440 1605.78 1440 21.26 21.97 16.13 16.64 10.14 10.68 3040 3311.12 2320 2512.2 1360 1605.78 1488 21.26 21.26 16.13 16.13 10.14 10.14 2960 3311.12 2280 2512.2 1160 1605.78 1563 21.26 20.24 16.13 15.36 10.14 9.83 3200 3311.12 2360 2512.2 1292 1605.78 1627 21.26 19.44 16.13 14.75 10.14 9.48 3280 3311.12 2480 2512.2 1512 1605.78 1680 21.26 18.83 16.13 14.29 10.14 9.16 3320 3311.12 2560 2512.2 1608 1605.78 1759 21.26 17.98 16.13 13.64 10.14 8.73 3360 3311.12 2600 2512.2 1720 1605.78 1805 21.26 17.53 16.13 13.30 10.14 8.50 3520 3311.12 2720 2512.2 1680 1605.78

Hence, according to load requirements, gear motors or VFD V. RESULT AND DISCUSSION may be used. Form the results, it is observed that the torque is maintained constant for VFD as shown in fig 5, but Gear motor requires variable torques. And power is maintained constant for Gear motor, but VFD requires varying power.

Fig. 7 Speed versus Power for VFD and Gear based Motor for 80%, 60 and 40 % of full load torques Fig.5. Speed versus Torque for VFD and Gear based

Motor for 80%, 60 and 40 % of full load torques  Motors that are significantly oversized and under

loaded—replace with more efficient, properly sized

models at the next opportunity, such as scheduled plant downtime.  Motors that are moderately oversized and under loaded—replace with more efficient, properly sized models when they fail.  Motors that are properly sized but standard efficiency—replace most of these with energy-efficient models when they fail. The cost-effectiveness of an energy-efficient motor purchase depends on the number of hours the motor is used, the price of electricity, and the price premium of buying an energy-efficient motor. Use Attachment B, the "Motor Energy Savings Calculation Form," to determine the cost-effectiveness of motor change out options.  VFDs can easily get a motor to produce full torque at any speed from full speed down to zero. The difficulty is in motor cooling. An inexpensive standard motor can Fig.6 Speed versus Power for VFD and Gear based Motor probably not operate continuously at much less than half for 80%, 60 and 40 % of full load torques speed without overheating. It is generally always better to Up to rated frequency (or speed), Gear motors requires higher use fixed gear so that the motor operates at full speed for torques and above rated speed, VFD requires higher torques the highest machine speed as shown in fig 6. Similarly, up to rated frequency (or speed), that is required. Gear motors requires higher power and above rated speed VFD requires higher power as shown in fig. 7.

Published By: Retrieval Number: D8195118419/2019©BEIESP Blue Eyes Intelligence Engineering DOI:10.35940/ijrte.D8195.118419 12152 & Sciences Publication International Journal of Recent Technology and Engineering (IJRTE) ISSN: 2277-3878, Volume-8 Issue-4, November 2019

 Use adjustable speed only to reduce from the highest AUTHORS PROFILE machine speed to lower speeds. Don't use a variable speed S.Joseph Francis is studying pre final year drive just to operate at a reduced constant speed. Electrical and Electronics Engineering in National  For 1/8 Hp, a DC speed controller and a permanent-magnet Engineering College, Kovilpatti. His area of interest is industiral drives and machines. DC motor or even a commutator DC motor will probably be less expensive than A VFD. DC motors can also have difficulty with the continuous low-speed operation.  A gear system will reduce the speed and INCREASE

torque by the inverse ratio. A VFD will reduce speed and K.Karthikeyan is studying pre final year Electrical MAINTAIN torque. and Electronics Engineering in National Engineering  VFD also allows ADJUSTING speed; a gearbox will only College, Kovilpatti. His area of interest is industiral drives and machines. CHANGE speed to a fixed value.  It is suggested that, below the rated frequency, VFD may be used and above the rated frequency, Gear motors may S.Bala Sundaram is studying pre final year be used. Electrical and Electronics Engineering in National Engineering College, Kovilpatti. His area of interest VI. CONCLUSION is industiral drives and machines.

This paper portrayed the survey details about the output torque of Gear reduction drive and variable frequency drive Dr.L.Kalaivani received her Ph.D. degree in (VFD) with detailed analysis report for the various load Information and Communication Engineering from conditions. From this investigation, the right selection of Anna University, Chennai, Tamilnadu, India. She VFD was acquired for the suitable load requirement and works as a Professor in Department of Electrical and Electronics Engineering, National Engineering application. The higher the load therefore more torque College, kovilpatti, Tamilnadu, India. She is a needed in an application. However the VFD as well as the member of various professional bodies and organized gearbox reduction motor drive should be rated by their varied funded workshops and seminars. She acted as Co-Investigator and completed one funded project. She has wide continuous output current (amps), it is important to select a publications in SCI, Scopus indexed Journals & Conferences. She is an drive with adequate current to the motor for optimal expert member in NBA and enhances the TLP. Currently, her research performance. It is clear that, gear reduction has the opposite interests include Wireless networks and soft computing. effect on torque. M.Gengaraj Pursuing his Ph.D degree in Power Electronics and Drives from Anna University, REFERENCES Chennai, Tamilnadu, India. He works as an Assistant Professor in Department of Electrical and Electronics 1. Agamloh Emmanuel, "Power and efficiency measurement of Engineering, National Engineering College, motor-variable frequency drive systems", IEEE Transactions on kovilpatti, Tamilnadu, India. He is a member of ISTE Industry Applications, vol. 53, no. 1, pp. 766-773, Jan/Feb 2017. and organized various workshops. He has three 2. JTE Fernando, AT Almeida, G Baoming, Impact of voltage sags and international conferences publications. Currently, his continuous unbalance on variable-speed drive, pp. 1-6, 2010. H. Poor, research interests include power converters, industrial drives and soft An Introduction to Signal Detection and Estimation. New York: computing. Springer-Verlag, 1985, ch. 4. 3. Agamloh Emmanuel, S. Peele, J. Grappe, "A Min analysis of voltage magnitude deviation and unbalance on standard and premium efficient induction motors", IEEE Pulp and Paper Industry Conference, June 2012. 4. Rotating electrical machines part 2-3: specific test methods for determining the losses of converter-fed AC machines, pp. 60034-2, 2013. 5. S. Seok, A. Wang, M. Y. Michael Chuah, D. J. Hyun, J. Lee, D. M. Otten, J. H. Lang, S. Kim, "Design Principles for Energy-Efficient Legged Locomotion and Implementation on the MIT Cheetah Robot", IEEE/ASME Transactions on Mechatronics, vol. 20, no. 3, pp. 1117-1129, Jun. 2015 6. S. Seok, A. Wang, D. Otten, S. Kim, "Actuator design for high force proprioceptive control in fast legged locomotion", International Conference on Intelligent Robots and Systems, pp. 1970-1975, 2012. 7. T. A. Funk, N. M. Saprunova, E. V. Belousov, A. M. Zhuravlev, "Indirect determination of the displacement components in an electric motor drive", Russian Electrical Engineering, vol. 86, no. 12, pp. 716-748, 2015 8. T. Verstraten, R. Furnemont, G. Mathijssen, B. Vanderborght, D. Lefeber, "Energy Consumption of Geared DC Motors in Dynamic Applications: Comparing Modeling Approaches", IEEE Robotics and Automation Letters, vol. 1, no. 1, pp. 524-530, Jan. 2016. 9. M. A. Grigor'ev, "Synthesis of electric drives realizing limit operating regimes in terms of operation speed and overload capacity", Russian Electrical Engineering, vol. 86, no. 12, pp. 694-696, 2015. 10. A. V. Pavlenko, I. V. Vasyukov, V. S. Puzin, V. P. Grinchenkov, A. V. Bol'shenko, "Designing of the output stage of the impulse power source", Russian Electrical Engineering, vol. 86, no. 8, pp. 453-458, 2015.

Retrieval Number: D8195118419/2019©BEIESP Published By: DOI:10.35940/ijrte.D8195.118419 Blue Eyes Intelligence Engineering 12153 & Sciences Publication