Aerotech BM Series, Hardware Manual

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BM/BMS Series Hardware Manual Introduction
www.aerotech.com 1-13
Table 1-8: BM250 and BM500 Motor Specifications (NEMA 34 Frame)
Motor Model Units BM250 BM500
Performance Specifications
(1,5)
Stall Torque, Continuous
(2,8)
N-m (oz-in) 2.0 (285) 3.6 (506)
Peak Torque
(3)
N-m (oz-in) 5.0 (712) 8.9 (1,264)
Rated Speed rpm 4,000 4,000
Rated Power Output, Continuous watts 843 1496
Electrical Specifications
(5)
BEMF Constant (Line-Line, Max) Volts
pk
/krpm 23.2 24.7
Continuous Current, Stall
(2,8)
Amp
pk
Amp
rms
10.5
7.4
17.5
12.4
Peak Current, Stall
(3)
Amp
pk
Amp
rms
26.3
18.6 43.8
30.9
N-m/Amp
pk
oz-in/Amp
pk
0.19
27.1 0.20
28.9
Torque Constant
(4,9)
N-m/Amp
rms
oz-in/Amp
rms
0.27
38.4 0.29
40.9
Motor Constant
(2,4)
N-m/ √ W
oz-in/ √ W
0.171
24.24 0.270
38.28
Resistance, 25°C (Line-Line) ohms 1.1 0.5
Inductance (Line-Line) mH 1.30 2.80
Maximum Bus Voltage VDC 340 340
Thermal Resistance C/W 0.94 0.74
Number of Poles P 8 8
Mechanical Specifications
Motor Weight kg (lb) 3.6 (7.92) 5.0 (11.0)
Rotor Moment of Inertia
kg-m
2
oz-in-s
2
7.85x10
-5
0.0111
1.39x10
-4
0.0197
Max Radial Load N (lb) 178 (40) 178 (40)
Max Axial Load N (lb) 89 (20) 89 (20)
Note:
1. Performance is dependent upon heat sink configuration, system cooling conditions, and ambient temperature.
2. 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.
3. Peak torque assumes correct rms current; consult Aerotech.
4. Torque constant and motor constant specified at stall.
5. All performance and electrical specifications ±10%.
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. De-rate continuous torque and continuous current by 10% when using an encoder.
9. All Aerotech amplifiers are rated A
pk
; use torque constant in N-m/A
pk
when sizing.