Motor control apparatus

Details Motor control apparatus Motor control apparatus

2011-08-02

2011-08-02

Masih, Karen (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S561000, C318S701000

Reexamination Certificate

active

07990088

ABSTRACT:
At an initial drive operation after turning on of an electric power source, an ECU sequentially changes each current exciting phase among multiple phases through one complete cycle at a predetermined time schedule, so that a rotational position of a rotor and the corresponding exciting phase coincide with each other at some timing during the initial drive operation, and thereby the rotor is rotated. The ECU counts the A-phase signal and the B-phase signal during the rotation of the rotor in the initial drive operation and learns a relationship among a count value of the A-phase signal and the B-phase signal, a rotational position of the rotor and each exciting one of the plurality of phases at an end of the initial drive operation. When the ECU determines that a result of the learning is erroneous, the ECU re-executes the learning by re-executing the initial drive operation.

REFERENCES:
patent: 7084597 (2006-08-01), Nakai et al.
patent: 7221116 (2007-05-01), Nakai et al.
patent: 2006/0197489 (2006-09-01), Nakai et al.
patent: 2007/0182353 (2007-08-01), Kamio et al.

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