BM Series Brushless Rotary Motor

Description

Design Features

  • Standard NEMA frame sizes
  • Rare-earth magnets maximize performance
  • Skewed stator design minimizes torque ripple and cogging for smooth velocity control over a wide speed range
  • Optional IP65-level construction allows use in harsh environments
  • Optional brake, front shaft seal, and precision gear reducers
  • Follows the 2011/65/EU RoHS 2 Directive

High-Performance Design

The BM series consists of Aerotech's high-performance brushless permanent magnet rotary servomotors. The motors feature rare-earth magnets for maximum torque and acceleration in a small package. A skewed stator design provides low torque ripple and smooth velocity. Unlike DC brush-type servomotors, the BM series are brushless and maintenance free. This makes them ideal for critical applications where downtime cannot be tolerated.

In addition, the BM series motors have very high power density resulting in high torque in a compact package. Optional IP65 sealing make these motors ideal for harsh environments such as machine tool.

Wide Torque Range

The BM motor series covers a wide range of torque and package sizes. Continuous output torque ranges from 0.16 N·m (22.5 oz·in) to 31.6 N·m (280 lb·in), with peak torques to 94.9 N·m (840 lb·in). Standard frame sizes include NEMA 17, 23, 34, 42 and 56. This makes it easy to mount any motor to Aerotech’s gearbox line with no adapter plates. These motors are well-suited to general purpose and high-end servo applications.

Application Flexibility

The standard motor has a 1000-line encoder (4000-line count after quadrature), RS-422 line driver output with Hall effect device outputs for commutation, and MS connectors. Options include increased encoder resolution, sealing for IP65 level protection, brakes, and gearboxes. Standard models can be delivered from stock and custom variations can be engineered to your requirements with minimal lead time.

Need help sizing your motor? Try Aerotech's Motor Sizer software to specify the ideal motor for your application.

Specifications

BM Series Specifications

Motor ModelUnitsBM22BM75BM130BM200
Performance Specifications(1,2)
Stall Torque, Continuous(3) N·m 0.16 0.51 1.02 1.45
oz·in 22.5 72 144 205
Peak Torque(4) N·m 0.48 1.3 2.5 3.6
oz·in 68 181 361 512
Rated Speed rpm 3,000 4,000 4,000 4,000
Rated Power Output, Continuous W 50 192 333 455
Electrical Specifications(2)
BEMF Constant (Line-Line, Max) Vpk/krpm 3.9 9 19 18
Continuous Current, Stall(3) Apk 4.9 9.0 6.9 10.3
Arms 3.5 6.4 4.9 7.3
Peak Current, Stall(4) Apk 14.7 22.5 17.3 25.8
Arms 10.4 15.9 12.2 18.2
Torque Constant(5) N·m/Apk 0.032 0.06 0.15 0.14
oz·in/Apk 4.5 8.0 20.9 19.9
N·m/Arms 0.045 0.08 0.21 0.20
oz·in/Arms 6.4 11.4 29.6 28.1
Motor Constant(3, 5) N·m/√W 0.038 0.053 0.098 0.125
oz·in/√W 5.37 7.52 13.84 17.77
Resistance, 25°C (Line-Line) Ω 0.67 1.0 2.0 1.1
Inductance (Line-Line) mH 0.73 0.8 1.8 1.1
Maximum Bus Voltage VDC 80 340 340 340
Thermal Resistance °C/W 6.26 1.41 1.20 0.98
Number of Poles - 8 8 8 8
Mechanical Specifications
Frame Size NEMA 17 23 23 23
Motor Weight kg 0.4 1.1 1.5 2.0
lb 0.88 2.42 3.30 4.40
Rotor Moment of Inertia kg·m2 2.00x10-6 5.20x10-6 9.20x10-6 1.30x10-5
oz·in·s2 0.00028 0.0007 0.0013 0.0018
Max Radial Load N 78 89 89 89
lb 18 20 20 20
Max Axial Load N 39 89 89 89
lb 9 20 20 20
Standards   2011/65/EU RoHS 2 Directive
  1. Performance is dependent upon heat sink configuration, system cooling conditions, and ambient temperature.
  2. All performance and electrical specifications ±10%.
  3. Values shown @ 105°C rise above a 25°C ambient temperature, with motor mounted to a 250 mm x 250 mm x 6 mm aluminum heat sink.
  4. Peak torque assumes correct rms current; consult Aerotech.
  5. Torque constant and motor constant specified at stall.
  6. Maximum winding temperature is 130°C.
  7. Ambient operating temperature range 0°C - 25°C; consult Aerotech for performance in elevated ambient temperatures.
  8. All Aerotech amplifiers are rated Apk; use torque constant in N·m/Apk when sizing.
Motor ModelUnitsBM250BM500
Performance Specifications(1,2)
Stall Torque, Continuous(3) N·m 2.3 3.6
oz·in 322 515
Peak Torque(4) N·m 5.7 9.1
oz·in 805 1,286
Rated Speed rpm 4,000 4,000
Rated Power Output, Continuous W 739 1065
Electrical Specifications(2)
BEMF Constant (Line-Line, Max) Vpk/krpm 28 29
Continuous Current, Stall(3) Apk 10.3 17.5
Arms 7.2 12.4
Peak Current, Stall(4) Apk 25.6 43.8
Arms 18.1 30.9
Torque Constant(5) N·m/Apk 0.22 0.21
oz·in/Apk 31.4 29.4
N·m/Arms 0.31 0.29
oz·in/Arms 44.4 41.6
Motor Constant(3,5) N·m/√W 0.198 0.275
oz·in/√W 28.04 38.94
Resistance, 25°C (Line-Line) Ω 1.1 0.5
Inductance (Line-Line) mH 2.74 1.42
Maximum Bus Voltage VDC 340 340
Thermal Resistance °C/W 0.99 0.74
Number of Poles - 8 8
Mechanical Specifications
Frame Size NEMA 34 34
Motor Weight kg 3.6 5.0
lb 7.92 11.0
Rotor Moment of Inertia kg·m2 7.85x10-5 1.39x10-4
oz·in·s2 0.0111 0.0197
Max Radial Load N 178 178
lb 40 40
Max Axial Load N 89 89
lb 20 20
Standards   2011/65/EU RoHS 2 Directive
  1. Performance is dependent upon heat sink configuration, system cooling conditions, and ambient temperature.
  2. All performance and electrical specifications ±10%.
  3. Values shown @ 105°C rise above a 25°C ambient temperature, with motor mounted to a 250 mm x 250 mm x 6 mm aluminum heat sink.
  4. Peak torque assumes correct rms current; consult Aerotech.
  5. Torque constant and motor constant specified at stall.
  6. Maximum winding temperature is 130°C.
  7. Ambient operating temperature range 0°C - 25°C; consult Aerotech for performance in elevated ambient temperatures.
  8. All Aerotech amplifiers are rated Apk; use torque constant in N·m/Apk when sizing.
Motor ModelUnitsBM800BM1400
Electrical Specifications(1,2)
Stall Torque, Continuous(3) N·m 6.1 11.0
  oz·in 866 1562
Peak Torque(4) N·m 15.3 27.6
  oz·in 2166 3905
Rated Speed rpm 3,000 3,000
Rated Power Output, Continuous W 1446 2529
Electrical Specifications(2)
BEMF Constant (Line-Line, Max) Vpk/krpm 69 69
Continuous Current, Stall(3) Apk 11.9 20.5
Arms 8.4 14.5
Peak Current, Stall(4) Apk 29.8 51.3
Arms 21.0 36.2
Torque Constant(5) N·m/Apk 0.51 0.54
oz·in/Apk 72.8 76.2
N·m/Arms 0.73 0.76
oz·in/Arms 103 107.8
Motor Constant(3,5) N·m/√W 0.439 0.713
oz·in/√W 62.24 100.93
Resistance, 25°C (Line-Line) Ω 1.2 0.5
Inductance (Line-Line) mH 3.8 1.7
Maximum Bus Voltage VDC 340 340
Thermal Resistance °C/W 0.67 0.54
Number of Poles - 8 8
Mechanical Specifications
Frame Size NEMA 42 42
Motor Weight kg 6.6 10.7
lb 14.52 23.54
Rotor Moment of Inertia kg·m2 3.00x10-4 5.60x10-4
oz·in·s2 0.0425 0.0793
Max Radial Load N 222 222
lb 50 50
Max Axial Load N 89 89
lb 20 20
Standards   2011/65/EU RoHS 2 Directive
  1. Performance is dependent upon heat sink configuration, system cooling conditions, and ambient temperature.
  2. All performance and electrical specifications ±10%.
  3. Values shown @ 105°C rise above a 25°C ambient temperature, with motor mounted to a 250 mm x 250 mm x 6 mm aluminum heat sink.
  4. Peak torque assumes correct rms current; consult Aerotech.
  5. Torque constant and motor constant specified at stall.
  6. Maximum winding temperature is 130°C.
  7. Ambient operating temperature range 0°C - 25°C; consult Aerotech for performance in elevated ambient temperatures.
  8. All Aerotech amplifiers are rated Apk; use torque constant in N·m/Apk when sizing.
Motor ModelUnitsBM2000BM3400BM4500
Performance Specifications(1,2)
Stall Torque, Continuous(3) N·m 14.7 23.7 31.6
oz·in 2,080 3,360 4,480
Peak Torque(4) N·m 44.1 71.2 94.9
oz·in 6,240 10,080 13,440
Rated Speed rpm 2,400 2,400 2,400
Rated Power Output, Continuous W 3282 5073 6789
Electrical Specifications(2)
BEMF Constant (Line-Line, Max) Vpk/krpm 99.0 99.0 113.1
Continuous Current, Stall(3) Apk 16.5 26.7 31.1
Arms 11.7 18.9 22.0
Peak Current, Stall(4) Apk 49.7 80.3 93.5
Arms 35.1 56.7 66.1
Torque Constant(5) N·m/Apk 0.89 0.89 1.01
lb·in/Apk 7.9 7.9 9.0
N·m/Arms 1.25 1.25 1.43
lb·in/Arms 11.1 11.1 12.7
Motor Constant(3,5) N·m/√W
lb-in/√W
1.13
10.0
1.86
16.5
2.31
20.5
Resistance, 25°C (Line-Line) Ω 0.54 0.20 0.17
Inductance (Line-Line) mH 3.50 1.60 1.50
Maximum Bus Voltage VDC 340 340 340
Thermal Resistance °C/W 0.78 0.80 0.69
Number of Poles - 6 6 6
Mechanical Specifications
Frame Size NEMA 56 56 56
Motor Weight kg 15 23 30
lb 33.0 49.9 66.9
Rotor Moment of Inertia kg·m2 1.25x10-3 2.23x10-3 3.24x10-3
lb·in·s2 0.0111
0.0197 0.0287
Max Radial Load N 668 668 668
lb 150 150 150
Max Axial Load N 223 223 223
lb 50 50 50
Standards   2011/65/EU RoHS 2 Directive
  1. Performance is dependent upon heat sink configuration, system cooling conditions, and ambient temperature.
  2. All performance and electrical specifications ±10%.
  3. Values shown @ 130°C rise above a 25°C ambient temperature, with motor mounted to a 250 mm x 250 mm x 6 mm aluminum heat sink.
  4. Peak torque assumes correct rms current; consult Aerotech.
  5. Torque constant and motor constant specified at stall.
  6. Maximum winding temperature is 155°C.
  7. Ambient operating temperature range 0°C - 25°C; consult Aerotech for performance in elevated ambient temperatures.
  8. All Aerotech amplifiers are rated Apk; use torque constant in N·m/Apk when sizing.
  • Torque Speed Curves 1
  • Torque Speed Curves 2

Dimensions

  • NEMA 17 [BM22]
  • NEMA 23 [BM75, BM130, BM200]
  • NEMA 34 [BM250, BM500]
  • NEMA 42 [BM800, BM1400]
  • NEMA 56 [BM2000, BM3400, BM4500]

Ordering Information

Ordering Example

BM130 -D25 -E2500H -BK -HF -3.8 -

Ordering Options

Series ConnectorsFeedbackBrakeCable TypeCable LengthShaft Seal
BM22
BM75
BM130
BM200
BM250
BM500
BM800
BM1400
BM2000
BM3400
BM4500

-MS
-D25
-D25-9D
-D25-FLB
-D25-5DU
-D25-9D-CMS
-D25-4TS

-E1000H
-E2000H
-E2500H
-E5000H
-E1000ASH
-BK -HF -xx -NS


NEMA Brushless Rotary Servomotors

Option Description
BM22 NEMA 17 brushless rotary servomotor
BM75 NEMA 23 brushless rotary servomotor
BM130 NEMA 23 brushless rotary servomotor
BM200 NEMA 23 brushless rotary servomotor
BM250 NEMA 34 brushless rotary servomotor
BM500 NEMA 34 brushless rotary servomotor
BM800 NEMA 42 brushless rotary servomotor
BM1400 NEMA 42 brushless rotary servomotor
BM2000 NEMA 56 brushless rotary servomotor
BM3400 NEMA 56 brushless rotary servomotor
BM4500 NEMA 56 brushless rotary servomotor

Connectors (Required)

Option Description
-MS Integral cable w/MS connector for Fbk and Mtr (-MS); not available for BM22
-D25 Integral cable w/D25 Fbk and 4D Mtr (-D25); only available on BM22, BM75, BM130, and BM200
-D25-9D Integral cable w/D25 Fbk, 4D Mtr, and 9D Limit (-D25-9D); only available on BM75, BM130, and BM200
-D25-FLB Integral cable w/D25 Fbk, Fly Leads for Mtr, and 9D Limit (-D25-FLB); only available on BM75, BM130, and BM200
-D25-5DU Integral cable w/D25 Fbk, 5D Mtr, and 9D Limit (-D25-5DU); only available on BM75, BM130, and BM200
-D25-9D-CMS Integral cable w/D25 Fbk, 4D Mtr, and 9D Limit - CMS Only (-D25-9D-CMS); only available on BM75, BM130, and BM200
-D25-4TS Integral cable w/D25 Fbk, 4TS Mtr, and 9D Limit (-D25-4TS); only available on BM75, BM130, and BM200

Feedback (Required)

Option Description
-E1000H 1000 lines/rev TTL incremental encoder w/Hall tracks (-E1000H); not available for BM22
-E2000H 2000 lines/rev TTL incremental encoder w/Hall tracks (-E2000H); not available for BM3400 or BM4500
-E2500H 2500 lines/rev TTL incremental encoder w/Hall tracks (-E2500H); not available for BM22
-E5000H 5000 lines/rev TTL incremental encoder w/Hall tracks (-E5000H); not available for BM22
-E1000ASH 1000 lines/rev 1 Vpp incremental encoder w/Hall tracks (-E1000ASH); not available for BM22, BM2000, BM3400 or BM4500

Brake (Optional)

Option Description
-BK Holding brake (-BK); not available on BM4500

Cable Type (Optional)

Option Description
-HF High flex cable; only available on BM75, BM130, and BM200

Cable Length (dm) (Optional)

Option Description
-xx Cable length in decimeters (3.8 dm is default); only available on BM75, BM130, and BM200

Shaft Seal (Optional)

Option Description
-NS Nitrile front shaft seal; only available on BM250, BM500, BM800 and BM1400

Vacuum Preparation (Optional)

Option Description
-VAC6 Vacuum preparation to 10-6 Torr

Accessories (Optional)

Option Description
MC-HPD25-M Connector; HPD motor power mate
MC-DB25-F Connector; DB25 motor feedback mate
MCM1-3 Connector; MS motor power mate (BM2000, BM3400, BM4500)
MCM-3 Connector; MS motor power mate (BM75, BM130, BM200, BM250, BM500, BM800, BM1400)
MCF-3 Connector; MS motor feedback mate

Note: Accessories are ordered as separate line items.