Title: Method of estimating magnetic pole position in synchronous motor
Application Number: 200610139555 Application Date: 2006.09.26
Publication Number: 1941606 Publication Date: 2007.04.04
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H02P6/18
Applicant(s) Name: Denso Corp. Address:
Inventor(s) Name:
Attorney & Agent: wangyang
Abstract:
    In a method of estimating a magnetic pole position in a synchronous motor, an alternating current voltage having alpha- and beta-axes components in an alphabeta coordinates system representing a two-phase alternating current coordinates system is applied to the motor, and alpha- and beta-axes components of an alternating current are detected from the motor. A wave height of the alternating current changing with time is approximated to a wave height not depending on time, so that a differentiated value of the wave height with respect to time is substantially set at zero. An induced voltage of the motor is calculated from the components of the alternating current voltage and the components of the alternating current. The magnetic pole position is estimated from the induced voltage.
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