MOTOR DRIVE DEVICE
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United States of America Patent
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Issued Date -
Jan 23, 2025
app pub date -
Mar 7, 2024
filing date -
Mar 7, 2024
priority date (Note) -
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status (Latency Note)
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Abstract
An embodiment provides a motor drive device including: a power conversion circuit having a configuration in which a plurality of arms including a series circuit of positive and negative semiconductor switching elements are connected in parallel to each other and configured to drive a motor; a controller configured to generate and output on/off signals for each of the semiconductor switching elements constituting the power conversion circuit by PWM control; a current detection unit configured to detect a current flowing through the power conversion circuit; a current limit unit configured to stop an operation of the controller when the current reaches a threshold; and a position estimation unit configured to estimate a rotational position of the motor using a motor current and a motor voltage, the position estimation unit being configured to correct the motor voltage used for estimation of the rotational position in a carrier cycle of the PWM control in which the operation of the controller is stopped.
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