Initialization damping for a permanent magnet motor

Details Initialization damping for a permanent magnet motor Initialization damping for a permanent magnet motor

1997-02-18

1998-08-18

Sircus, Brian

Electricity: motive power systems

Switched reluctance motor commutation control

318439, H02K 2300

Patent

active

057962278

ABSTRACT:
During the initialization phase, the rotor (or wheel) of a gyroscope is aligned by application of an alignment pulse to insure that it rotates in a known direction upon start up. However, without some means for damping the rotor, the rotor will oscillate about the null position for an excessive period of time. The back emf signal induced in the non-excited winding can be used to generate a feedback signal for modifying the alignment pulse to minimize oscillation. In one variation, the back emf signal is frequency multiplied and inverted, and then combined with the alignment pulse. The combined signal is applied to the winding to rapidly align the wheel.

REFERENCES:
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patent: 5397972 (1995-03-01), Maiocchi
patent: 5428284 (1995-06-01), Kaneda et al.
patent: 5530326 (1996-06-01), Galvin et al.
patent: 5572097 (1996-11-01), Cameron

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