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Topics: Servo & Stepper Motors & Drives on Servo Control
Start by
Anshul Sharma
09-22-2013 11:26 PM

Servo & Stepper Motors & Drives

How well is regenerative braking concept applied to Servo & Stepper Motors. How is the power generated during braking used.

I am doing a research on Servo & Stepper Motors & Drives.
Need a help on the above issue
Would appreciate your help and comments on it.

09-23-2013 02:03 AM
Top #2
Barry Payne
09-23-2013 02:03 AM
Stepper are generally sized so there is no phase slip to generate voltage. There are hybrid steppers with encoder feedback which may need regen braking but not standard stepper motors.

Servos usually bleed the excess voltage across a resistor. For many applications the amount of power lost across the resistor when braking is not worth saving. A lot of the losses will actually happen in the motor. For the cases with a lot of regen braking people will use converters to feed back into the grid or gang together the DC bus from multiple drives.
09-23-2013 04:38 AM
Top #3
LC Neo
09-23-2013 04:38 AM
Just to share some thoughts.

Getting things right at beginning is important. In this case, an efficient motor with excellent torque constant, thermal resistance, power to weight ratio, etc is key to avoid losses or waste later.

Pertaining Stepper Motors, Disc Magnet Motor has unique configuration that enables high torque with extreme low inertia, extreme fast acceleration/deceleration, precision positioning with higher pole count, etc. The disc magnet technology gives the rotor a very low inertia and makes it possible to accelerate at rates no other technology is able to match. (Eg. From 4000 rpm to – 4000 rpm in 3 ms.) It's extreme high dynamic performance is comparable to DC servo motor but obtained from a simple stepper motor. High start/stop frequencies allow time saving during the first step and to solve motion problems without applying a ramp. Coupled with microstepping, sinusoidal torque function can be featured with very low harmonic distortion and low detent torque.

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