Electric motor and a method therefor

Details Electric motor and a method therefor Electric motor and a method therefor

2007-06-26

2009-10-06

Leykin, Rita (Department: 2837)

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

C318S671000, C318S592000, C310S015000, C310S012060, C310S036000, C310S0400MM, C700S063000

Reexamination Certificate

active

07598697

ABSTRACT:
A motor and a method for serves finding the position of an armature in relation to a stator of the motor. In the method and the motor the armature is driven by an exciting field which is produced by exciting windings of the stator, and the armature is caused by the exciting field to perform an oscillatory motion, whose progression is detected by a position measuring means for measuring positions of the armature and is evaluated to determine the relative position, with the steps of:designation of a target value signal, applicable for a target oscillation, to a commutation means for current flow in the exciting windings;modification of a designating commutation offset value in the commutation means within a value range essentially corresponding to the distance between the two adjacent poles of the armature, the designating commutation offset value defining an assumed relative position with reference to at least one exciting winding of the stator;causing flow of current through the exciting windings on the basis of the respective designating commutation offset value and of the target value signal so that the armature is driven to perform a oscillatory motion corresponding to the target oscillation; andfinding at least one actual commutation offset value in the case of which the oscillation amplitude of the oscillation motion is at its maximum.

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Doo-Hee Jung and In-Joong Ha: “An Efficient Method for Identifying the Initial Position of a PMSM with an Incremental Encoder”, IEEE Transactions on Industrial Electronics, vol. 45, Issue 4, pp. 682-685 (Aug. 1998).

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