TBM-7646-A Kollmorgen
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The Kollmorgen TBM-7646-A is part of the TBM Frameless Motors series and has a rated power of 335 W and a rated speed of 1850 RPM. This motor provides a continuous stall torque of 2.18 N-m, a peak stall torque of 6.74 N-m, and a torque constant of 0.235 N-m/Arms. It operates at a rated voltage of 48 VDC and weighs 1.079 kg.
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Product Description:
The TBM-7646-A is a frameless brushless motor built by Kollmorgen and supplied within the TBM Frameless Motors series. Because the stator and rotor are delivered without a housing or bearings, the active elements can be embedded directly into joints, spindles, or gimbals. This arrangement minimizes the overall envelope while providing continuous torque for coordinated motion axes in industrial automation.
The electromagnetic profile starts with a back-emf constant of 14.2 Vrms/kRPM, indicating the voltage the winding generates for every thousand revolutions per minute and setting the commutation voltage demanded from the drive at a 48 VDC bus. Continuous operation is supported by a winding current of 9.63 Arms that yields a continuous stall torque of 2.18 N-m, establishing steady-state heat dissipation for sizing thermal paths in compact assemblies. Copper losses are governed by a phase resistance of 0.387 ohms, while a phase inductance of 0.63 mH shapes current rise time and influences drive PWM frequency selection. With twelve poles, the electrical frequency equals six times the mechanical speed, and a torque constant of 0.235 N-m/Arms links commanded current to produced torque for current-mode control loops.
The rotor weighs 1.079 kg and carries an inertia of 0.0000819 kg-m², allowing high acceleration without excessive servo gains. During transients, the motor can deliver a peak stall torque of 6.74 N-m, which is useful for overcoming the 0.068 N-m static friction of precision gear trains or couplings. When running at the rated mechanical output, the shaft delivers 335 W of power at a rated speed of 1850 RPM, and viscous damping of 0.0281 N-m/kRPM must be included in load models to predict speed droop. These mechanical figures, combined with the 48 V supply requirement, help match the motor to suitable servo drives and thermal management hardware without unnecessary margin.
Frequently Asked Questions about TBM-7646-A:
Q: What is the rated speed of the TBM-7646-A motor?
A: The TBM-7646-A has a rated speed of 1850 RPM for continuous operation.
Q: What is the continuous stall torque rating for the TBM-7646-A?
A: This motor produces a continuous stall torque of 2.18 N-m, making it capable of maintaining torque without rotation.
Q: What is the rated voltage required for operating the TBM-7646-A motor?
A: The TBM-7646-A operates at a rated voltage of 48 VDC, suitable for standard low-voltage systems.
Q: What is the peak stall torque specification for TBM-7646-A?
A: The peak stall torque for this motor is 6.74 N-m, which indicates the maximum torque it can hold at zero speed.
Q: How many poles does the TBM-7646-A frameless motor contain?
A: This model has 12 poles, affecting its torque and speed characteristics.
