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EM-V Series Electromagnets and Electromagnet Power Supplies EM-V Series Electromagnets and Electromagnet Power Supplies Introduction The Lake Shore EM-4V and EM-7V electromagnets (EM-V Series) produce magnetic fields with a variety of indexed air gap and pole cap configurations. The EM-V Series are ideally suited for integration into customer-designed magnetic test platforms for applications including magneto-optical studies, magnetic hysteresis studies, in- line annealing, Hall effect studies, susceptibility measurements, spin magnetic resonance demonstrations, and biological studies. The EM-V Series magnet coupled with a Lake Shore magnet power supply (MPS) and teslameter form a versatile laboratory electromagnet capable of producing magnetic fields up to 3.26 T and supporting very fast ramp rates of up to 1 T/s. This system, with true bipolar MPS power output, provides rapid uniform magnetic field ramping and field reversal to avoid discontinuities that occur during zero crossover when using unipolar power supplies. ExactGAP™ indexed gap settings The EM-V Series electromagnets feature ExactGAP™ indexed pole settings. The ExactGAP™ pole gap indexing makes it fast and easy to reconfigure the magnet gap for the required sample or option size without having to re-calibrate the magnet after changing the gap. EM-4V, EM-7V Features Choose from 6 repeatable gap widths by unbolting the top plate and clicking the selector into place. The EM-V Series incorporate water- ™ Indexed pole gap settings (ExactGAP ) allow repeatable air gap cooled coils and precision yokes made of magnetically soft, ultra-pure changes without having to re-calibrate between changes steel, assuring precise pole cap alignment as well as excellent field Exceptional field intensities achieved with cylindrical or tapered homogeneity and stability. pole caps Water-cooled coils provide excellent field stability and uniformity Removable pole caps facilitate variable pole face configurations exactgap™ and easy pole cap exchange magnet indexing Accurate pole alignment by precise construction of the air gap adjustment mechanism Choose from 6 repeatable The EM-4V/EM-7V yoke designed for optimum air gap gap widths by accessibility for both top and bottom of the magnet unbolting the Compact size of the EM-4V permits convenient bench-top top plate and mounting clicking the Optional optical access pole caps available selector into place 2 | Electromagnets and Electromagnet Power Supplies WWW.LAKESHORE.COM Transform your MCS-EMP modules and options electromagnet into a modular Electronic measurement modules characterization system FastHall™ Hall effect The EM-V Series can be upgraded to a modular characterization (Others to come) system (MeasureReady™ MCS-EMP). This transforms the electromagnet into a complete measurement solution using options to enable sample inserts (for both magnet and electrical experiments), sample temperature control options, preconfigured Temperature options measurement module options, and MeasureLINK™-MCS software GlideLOCK™ oven to control data collection and analysis. CCR/CCR-O MCS-EMP modular characterization system Shown with optional sample holder in GlideLOCK™ mount Temperature control Electromagnet Sample options (power supply High performance sample holder/insert & cards not shown) Room temperature top-side optical access Manual rotation Compatible measurement instruments 155 precision current/voltage source 372/3708 AC resistance bridge Electromagnet system controller (ESC) Add your own third-party instruments MeasureLINK™-MCS software MeasureLINK™-MCS software is the key component of each MeasureReady™ MCS system. It facilitates field control, temperature control, measurement sequencing, and integration functions. This flexible software allows the user to monitor the real-time performance of the MCS-EMP and to construct measurement sequences from a set of predefined controls. The menu- driven graphical user interface (GUI) provides the ability to control field and temperature to a specific setpoint or to loop these parameters through a range of settings with a specified step value. The sequences can be saved and recalled for use in repeated measurements. Please see the MCS-EMP catalog for more details WWW.LAKESHORE.COM Electromagnets and Electromagnet Power Supplies | 3 EM-V Series electromagnet specifications The EM-V Series electromagnets produce EM-4V typical field uniformity variable magnetic fields with a variety Magnet configuration Uniformity 1% cylindrical volume of air gap and pole cap configurations. Pole cap Air gap over 1 cm3 Diameter Length They are ideal for applications including mm (in) mm (in) mm (in) mm (in) magneto-optical studies, magnetic 102 (4.0) 51 (2.0) ±0.15% 18 (0.7) 51 (2.0) 102 (4.0) 25 (1.0) ±0.05% 64 (2.5) 25 (1.0) hysteresis studies, in-line annealing, 76 (3.0) 25 (1.0) ±0.06% 46 (1.8) 25 (1.0) Hall effect studies, susceptibility 51 (2.0) 25 (1.0) ±0.35% 18 (0.7) 25 (1.0) measurements, spin magnetic resonance 51 (2.0) 13 (0.5) ±0.16% 36 (1.4) 13 (0.5) demonstrations, and biological studies. EM-7V typical field uniformity Magnet configuration Uniformity 1% cylindrical volume Pole cap Air gap over 1 cm3 Diameter Length mm (in) mm (in) mm (in) mm (in) 51 (2.0) 16 (0.6) ±0.11% 28 (1.1) 16 (0.6) 51 (2.0) 25 (1.0) ±0.33% 10 (0.4) 25 (1.0) 102 (4.0) 16 (0.6) ±0.03% 74 (2.9) 16 (0.6) 102 (4.0) 25 (1.0) ±0.03% 66 (2.6) 25 (1.0) 102 (4.0) 38 (1.5) ±0.05% 48 (1.9) 38 (1.5) 102 (4.0) 51 (2.0) ±0.08% 23 (0.9) 51 (2.0) NOTE: The third column gives uniformity over one cubic centimeter volume centered in the magnet gap. The last two columns give the cylindrical volume within which the magnetic field deviates by less than 1% from the central field. The cylindrical volume is coaxial with the magnet poles and centered in the gap. EM-4V EM-7V Air gaps With no pole caps 57.5, 62, 70, 75, 78, and 100 mm With 2 in pole caps 7.5, 12, 20, 25, 28, and 50 mm 0.25 Ω per coil 1.00 Ω per coil Coil resistance, nominal (0.5 Ω total wired in series) (0.5 Ω total wired in parallel) 0.23 Ω per coil 0.92 Ω per coil Coil resistance, cold (0.46 Ω total wired in series) (0.46 Ω total wired in parallel) 0.27 Ω per coil 1.08 Ω per coil Coil resistance, maximum (0.54 Ω total wired in series) (0.54 Ω total wired in parallel) Integrated pole diameter 100 mm (4 in) 178 mm (7 in) Available pole cap diameters 50 mm (2 in) 100 mm (4 in) and 50 mm (2 in) Cooling water Tap water or closed cooling system Water flow rate 7.6 L/min (2 gal/min) 11.4 L/min (3 gal/min) Pressure drop 200 kPa (30 psi) 220 kPa (32 psi) Water chiller cooling capacity 2.5 kW (8,530 BTU/h) 5.0 kW (17,060 BTU/h) Water inlet temperature 15 °C to 25 °C (59 °F to 77 °F) Coil over temperature limit 45 °C (113 °F) Coil spacing, nominal 121 mm (4.75 in) 178 mm (7 in) Coil size-width, nominal 121 mm (4.75 in) 132 mm (5.2 in) Coil size-diameter, nominal 311 mm (12.25 in) 445 mm (17.5 in) Current ±70 A ±135 A (maximum continuous operating) ±35 V (approximately 38 V at maximum ±70 V (approximately 38 V at maximum Voltage, nominal coil temperature) coil temperature) Continuous input power, nominal 2.5 kVA (2.65 kVA at max temperature) 9.45 kVA (10.125 kVA at max temperature) Suggested power supply Lake Shore Model 643 Lake Shore Model 648 Size Height 77 cm (30.3 in) 52.7 cm (20.8 in) Width 78.7 cm (31 in) 78.7 cm (31 in) Depth 88.9 cm (35 in) 88.9 cm (35 in) Weight 201.9 kg (445 lb) 635 kg (1400 lb) Shipping weight 215.5 kg (475 lb) 660 kg (1500 lb) 0.97 m × 0.58 m × 0.56 m 0.86 m × 1.22 m × 1.19 m Shipping dimensions (38 in × 23 in × 22 in) (34 in × 48 in × 47 in) 4 | Electromagnets and Electromagnet Power Supplies WWW.LAKESHORE.COM EM-4V 78.7 cm (31 in) 67.8 cm Gap Index 6 63.6 cm Gap Index 1 (26.7 in) (25 in) 7.8 cm10.8 cm 11.7 cm 39.4 cm (3.1 in) (4.3 in) (4.6 in) (15.5 in) Ø31.1 cm Lift point (12.3 in) 46 cm MAGNET (18.1 in) 30.5 cm 30.5 cm (12 in) (12 in) 77 cm (30.3 in) 88.9 cm 31.1 cm (35 in) (12.3 in) BASE EM-7V 78.7 cm (31 in) 81.7 cm Gap Index 6 77.5 cm Gap Index 1 (32.2 in) (30.5 in) 55.9 cm 10.3 cm 13 cm 15.5 cm (22 in) (4.1 in) (5.1 in) (6.1 in) Ø44.5 cm (17.5 in) Lift point 52.7 cm (20.8 in) MAGNET 30.5 cm 30.5 cm (12 in) (12 in) 88.9 cm 31.1 cm (35 in) (12.3 in) BASE WWW.LAKESHORE.COM Electromagnets and Electromagnet Power Supplies | 5 EM-V Series field plots EM-7V no pole caps field plot EM-7V 100 mm (4 in) pole caps field plot Gap 1 – 57.5 mm 0.7 Gap 1 – 146.5 mm 1.4 Gap 2 – 62 mm Gap 2 – 151 mm Gap 3 – 70 mm Gap 3 – 159 mm Gap 4 – 75 mm 0.6 1.2 Gap 5 – 78 mm Gap 4 – 164 mm Gap 6 – 100 mm 0.5 1.0 0.4 0.8 Field (T) Field (T) 0.3 0.6 0.2 0.4 0.1 0.2 Typical results Typical results 0.0 0.0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 Current (A) Current (A) EM-7V 50 mm (2 in) pole caps field plot EM-7V remanent field mm 1 – 7.5 Gap 40 3 – 12 mm Gap 2 2 in pole caps m – 20 m Gap 3 2.5 mm 4 – 25 Gap 30 mm 5 – 28 2 Gap mm – 50 Field (T) 1.5 6 20 Gap Remanent eld (mT) 1 10 0.5 4 in pole caps No pole caps Typical results 0 0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 0 20 40 60 80 100 120 140 160 180 Current (A) Air gap (mm) 6 | Electromagnets and Electromagnet Power Supplies WWW.LAKESHORE.COM EM-7V 100 mm (4 in) pole caps field plot EM-4V no pole caps field plot EM-4V 50 mm (2 in) pole caps field plot 0.8 3.0 Gap 1 – 57.5 mm m 2.75 – 7.5 m Gap 2 – 62 mm Gap 1 0.7 Gap 3 – 70 mm 2.5 mm – 12 Gap 4 – 75 mm ap 2 Gap 5 – 78 mm G 0.6 2.25 Gap 6 – 100 mm 2.0 mm 20 – 0.5 p 3 1.75 Ga m 5 m – 2 4 0.4 1.5 ap G m 8 m Field (T) 2 Field (T) – 1.25 5 ap 0.3 G 1.0 0 mm – 5 ap 6 0.2 0.75 G
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