Motor Control Device
AssigneeSanyo Electric Co., Ltd.
InventorYoshio TOMIGASHI
Life of this patent
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Abstract
A motor control device that includes a first speed estimator estimating the rotation speed of the rotor of a permanent-magnet synchronous motor and that controls the motor so that a first estimated rotation speed estimated by the first speed estimator follows the specified speed value further includes a second speed estimator that estimates the rotation speed of the rotor by an estimation method different from that used by the first speed estimator. The motor control device detects synchronization failure based on a comparison between a second estimated rotation speed estimated by the second speed estimator and the first estimated rotation speed or the specified speed value.
Claims3
A motor control device comprising a first speed estimator estimating a rotation speed of a rotor of a permanent-magnet synchronous motor, the motor control device controlling the motor so that a first estimated rotation speed estimated by the first speed estimator follows a specified speed value,
- the motor control device further comprising:
- a second speed estimator estimating the rotation speed of the rotor by an estimation method different from that used by the first speed estimator;
- and
- a synchronization failure detector detecting synchronization failure in the rotor based on a second estimated rotation speed estimated by the second speed estimator and on the first estimated rotation speed or the specified speed value.
Dependencies are inferred from the claim text.