Method and apparatus for controlling a motor

Details Method and apparatus for controlling a motor Method and apparatus for controlling a motor

2009-06-22

2011-11-08

Masih, Karen (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S503000, C318S606000

Reexamination Certificate

active

08054019

ABSTRACT:
The invention concerns a method and an apparatus for controlling a three-or-more-phase motor driven by a frequency converter. In the method, a change-over switch of the frequency converter is controlled to a continuously conducting state and at the same time the phase voltages or phase currents of the other phases are controlled by switching the change-over switches in those motor phases at a switching frequency substantially higher than the frequency of the fundamental wave of the phase voltage or phase current. The apparatus comprises in conjunction with the frequency converter a number of change-over switches, at least one change-over switch for each motor phase. The change-over switches comprise controllable change-over contacts. The apparatus further comprises in conjunction with the frequency converter means for determining the motor phase currents and means for controlling the change-over contacts.

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patent: 2002/0175649 (2002-11-01), Reutlinger
patent: 2006/0267515 (2006-11-01), Burke et al.
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patent: 2000-316291 (2000-11-01), None

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