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US 12,749,992 B2Granted
Motor drive device
AssigneeKabushiki Kaisha Toyota Jidoshokki
InventorShunsuke Sawano
Life of this patent
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Abstract
A motor drive device includes a motor having a rotor, and a control device that controls the motor. The control device calculates a first value based on a d axis current and a q axis current of the motor. The control device calculates a second value by integrating the first value. The control device calculates a third value by performing prescribed control for making the second value equal to zero. The control device performs, based on the third value, position control for causing a rotational position of the rotor to match a designated position.
Claims9
A motor drive device comprising:
- a motor including a rotor, and a stator around which coils of three phases are wound;
- an inverter that drives the motor;
- and
- a control device that controls the inverter, wherein
- the control device performs a normal control for producing torque in the motor and an initial control prior to the normal control, and
- the control device during the initial control
- performs coordinate transformation of a current flowing through the motor into a d axis current and a q axis current,
- calculates a correlation value by integrating a value based on the d axis current and the q axis current, the correlation value correlated with an amount of difference between a position of the rotor and a designated position,
- performs, based on the correlation value, position control for causing an initial position of the rotor to match the designated position,
- performs the position control by generating a magnetic field at the designated position with the q-axis current command value set to zero and the d-axis current command value set to a predetermined value, and
- changes the designated position with passage of time such that the amount of difference decreases.
8 more elements
Dependencies are inferred from the claim text.