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SE-B4.210.050-00.015 Bosch Rexroth Indramat

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The SE-B4.210.050-00.015 from Bosch Rexroth Indramat is part of the SE Synchronous Servo Motors series and offers a maximum torque of 52.0 Nm with a nominal speed of 5000 rpm. It features a standstill current of 28 A, a torque constant of 0.64 Nm/A, and a thermal time constant of 32 minutes. The motor includes a shaft size of 24 k5 by 50 mm and a winding resistance of 0.27 Ohm.

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Product Description:

The SE-B4.210.050-00.015 is a brushless AC servo motor produced by Bosch Rexroth Indramat and categorized under the SE Synchronous Servo Motors series. Designed for closed-loop motion control in packaging, printing, and material-handling stations, the unit converts drive current into controllable torque with integrated tachogenerator feedback. Its role in industrial automation is to deliver repeatable velocity and position control so machine axes can accelerate, decelerate, and hold loads with high accuracy.

At a nominal speed of 5000 rpm, the rotor can be driven continuously while the stator windings remain within thermal limits. When held motionless, the motor resists external loads with a standstill torque of 18 Nm and draws a standstill current of 28 A. Peak mechanical demand is covered by a maximum torque reserve of 52.0 Nm, which is available for intermittent SM 50/100 duty. Each ampere supplied contributes torque in proportion to the torque constant of 0.64 Nm/A, allowing the controller to predict shaft force from current. Power is delivered through 6.0 mm² conductors at the motor connection area. Rotation is transmitted through a Ø24 k5 × 50 mm shaft fitted with a standard A8 × 7 × 40 feather key. The attached tachogenerator outputs 1.8 V per 1000 rpm with a tolerance of ±5 percent, providing speed feedback directly to legacy converters.

The electrical time constant of 12.0 ms indicates the current rise delay in the windings, while the mechanical time constant of 3.3 ms indicates how quickly the rotor accelerates after torque is applied. System responsiveness is further influenced by a rotor inertia of 4.98 × 10⁻³ kg·m², balancing load matching against overshoot. Continuous operation is supported by a thermal time constant of 32 min, indicating how slowly the frame temperature follows load changes. The winding inductance is 3.3 mH, and the winding resistance is 0.27 Ω. A voltage constant of 68 V per 1000 rpm assists drive tuning by linking applied voltage to flux and back-EMF behavior.

Electrical Time Constant
12.0 ms
Feather Key
A8 x 7 x 40
Inertia Incl. Tachogen.
4.98 x 10^-3 kgm2
Max Torque
52.0 Nm (SM 50/100)
Mechanical Time Constant
3.3 ms
Motor Connection Area
6.0 mm2
Nominal Speed
5000 rpm
Shaft Size
Ø24 k5 x 50 mm
Standstill Current
28 A
Standstill Torque
18 Nm
Tachogenerator Output
1.8 V/1000 rpm ±5%
Thermal Time Constant
32 min
Torque Constant
0.64 Nm/A
Voltage Constant
68 V/1000 rpm
Winding Inductance
3.3 mH
Winding Resistance
0.27 Ohm

Frequently Asked Questions about SE-B4.210.050-00.015:

Q: What is the maximum torque output of the SE-B4.210.050-00.015 servo motor?

A: The SE-B4.210.050-00.015 servo motor is rated for a maximum torque of 52.0 Nm (SM 50/100).

Q: What is the nominal speed specification for the SE-B4.210.050-00.015 servo motor?

A: This model provides a nominal speed of 5000 rpm for continuous operation.

Q: What is the shaft size of the SE-B4.210.050-00.015 servo motor?

A: The shaft size of this motor measures Ø24 k5 x 50 mm.

Q: What is the standstill torque rating of the SE-B4.210.050-00.015?

A: Standstill torque for this unit is rated at 18 Nm.

Q: What is the winding resistance of the SE-B4.210.050-00.015 servo motor?

A: The winding resistance of the SE-B4.210.050-00.015 is specified at 0.27 Ohm.


Internal Product Review

  • ‘‘The SE-B4.210.050-00.015 is a Bosch Rexroth Indramat synchronous servo motor with a 5000 rpm nominal speed and 52.0 Nm maximum torque. Strong low-speed performance from 18 Nm standstill torque pairs well with a fast 3.3 ms mechanical time constant for responsive motion control. A well-tuned servo choice for demanding automation axes where speed and torque both matter.’’

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