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Implementation of Redundancy in Stepper Motors

Categories: Latest NewsRelease time: 2015-09-25 09:47:00
Source: ZHAOWEIEditor: ZHAOWEI Author: ZHAOWEI

  Some of the recent research activities in the area of electric motor drives for critical applications (such as aerospace and nuclear power plants) are focused on looking at various fault tolerant motor and drive topologies. After discussing different solutions, this paper focuses on a miniature PM stepper motor design which falls in this fault tolerant category by providing an increased redundancy.

8MM metal planetary DC motor

What is a fault tolerant motor?

The specifications of a fault tolerant motor include:

•     Higher redundancy, by using identical motor segments on the same shaft.

•     Electrically isolated phases to prevent phase to phase short-circuit.

•     Magnetically uncoupled windings to avoid reduction

of performance in the case of a failure of the other phases.

•     Physically isolated phases to prevent propagation

of the fault into the neighboring phases and to increase the

thermal insulation.

Conclusion

The specific and patented design of some existing small miniature motor (down to Ø6mm) meets, with very little adaptation, the specifications for a fault-tolerant, robust, reliable motor with the degree of redundancy which is crucial in safety-critical applications that rely on the failure free operation of electric motor drives.

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