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
  • NEMA 23
  • NEMA 34
  • NEMA 42
  • NEMA 56

Ordering Information

Ordering Example

BM -130 -MS -E2000H -X

Ordering Options

Motor SeriesMotor Torque Code Connector Option Encoder Resolution with Hall Tracks Motor Options
BM

22
75
130
200
250
500
800
1400
2000
3400
4500

-MS
-D25
E1000H
E2000H
E2500H
E5000H
E1000ASH
BK1
BK2
BK3
BK5
NS
VAC6

Brushless Rotary Servomotors

Option Description
BM22 NEMA 17 brushless servomotor; 0.16 N·m (22.5 oz·in) continuous torque
BM75 NEMA 23 brushless servomotor; 0.51 N·m (72 oz·in) continuous torque
BM130 NEMA 23 brushless servomotor; 1.02 N·m (144 oz·in) continuous torque
BM200 NEMA 23 brushless servomotor; 1.45 N·m (205 oz·in) continuous torque
BM250 NEMA 34 brushless servomotor; 2.3 N·m (322 oz·in) continuous torque
BM500 NEMA 34 brushless servomotor; 3.6 N·m (515 oz·in) continuous torque
BM800 NEMA 42 brushless servomotor; 6.1 N·m (866 oz·in) continuous torque
BM1400 NEMA 42 brushless servomotor; 11.0 N·m (1562 oz·in) continuous torque
BM2000 NEMA 56 brushless servomotor; 14.7 N·m (2,080 oz·in) continuous torque
BM3400 NEMA 56 brushless servomotor; 23.7 N·m (3,360 oz·in) continuous torque
BM4500 NEMA 56 brushless servomotor; 31.6 N·m (4,480 oz·in) continuous torque

Connectors

Option Description
-MS MS connectors for feedback and motor power (not available on BM22)
-D25 D-shell for feedback and motor power (not available on BM250, BM500, BM800, BM1400, BM2000, BM3400, and BM4500)

Feedback

Option Description
-E1000H Encoder, A quad B with marker, 5 VDC, 1000 lines, line-driver output
-E2500H Encoder, A quad B with marker, 5 VDC, 2500 lines, line-driver output
-E5000H Encoder, A quad B with marker, 5 VDC, 5000 lines, line-driver output
-E1000ASH Encoder, amplified sine, 5 VDC, 1000 lines with integral hall sensors

Options (Brushless Rotary Motors)

Option Description
-BK1 Brake, holding torque = 0.8 N·m (112 oz·in), 24 VDC, 0.3 A for BM75, BM130, and BM200
-BK2 Brake; holding torque = 1.7 N·m (240 oz·in), 24 VDC, 0.4 A for BM250, BM500
-BK3 Brake; holding torque = 5.6 N·m (800 oz·in), 24 VDC, 0.7 A for BM800, BM1400
-BK5 Brake; holding torque = 40.7 N·m (5,760 oz·in), 24 VDC, 0.7 A for BM2000, BM3400, BM4500
-NS IP65 rated Nitrile front shaft seal (not available for BM75, BM130, BM200)
-VAC6 Vacuum prep for up to 10-6 Torr

Example: Motor with 2000 line encoder and Nitrile shaft seal: BM250-MS-E2000H-NS

Accessories

Option Description
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 for all BM motors