Synchronous motor driving apparatus

Details Synchronous motor driving apparatus Synchronous motor driving apparatus

2007-10-02

2007-10-02

Leykin, Rita (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Field winding circuits

C318S521000, C318S700000, C318S710000, C318S712000

Reexamination Certificate

active

11206211

ABSTRACT:
A synchronous motor driving apparatus having a power converter which applies AC variable voltages having variable frequency to a synchronous motor includes a pulsating current application unit for applying pulsating current to the synchronous motor and a magnetic pole position presumption unit. The magnetic pole position presumption unit detects two current values ΔIdcp1and ΔIdcp2on the positive side and two current values ΔIdcn1and ΔIdcn2on the negative side of the pulsating current and presumes the magnetic pole position of the synchronous motor on the basis of difference between change rates of ΔIdcp1→ΔIdcp2and ΔIdcp1→ΔIdcp2.

REFERENCES:
patent: 6320349 (2001-11-01), Kaneko et al.
patent: 6441572 (2002-08-01), Batzel
patent: 6696812 (2004-02-01), Kaneko et al.
patent: 8-13196 (1996-02-01), None
patent: 2002-78392 (2002-03-01), None

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