Motor control device and motor control method

A motor control device which controls a phase current of a motor by using a drive voltage supplied to the motor, comprising

• a control initiation-stop determiner configured to switch a state of the drive voltage to a stop state in which a control is stopped, a start state in which the control is executed, or an initiation state;
• and
• a drive voltage controller configured to control the drive voltage based on the state switched by the control initiation-stop determiner, wherein
• when the state of the drive voltage is to be transitioned from the stop state to the start state, the control initiation-stop determiner switches the state of the drive voltage to the initiation state during the transition from the stop state to the start state,
• the drive voltage controller controls the drive voltage such that the phase current increases or decreases in the initiation state as time elapses,
• the control initiation-stop determiner switches the state of the drive voltage to the stop state when temperature of a switching element configured to generate the drive voltage exceeds a threshold, and
• the control initiation-stop determiner sets a duration of the initiation state based on a value of the temperature exceeding the threshold such that a first duration set based on a first value of the temperature that is larger than a second value of the temperature is longer than a second duration set based on the second value.

A motor control method performed by a motor control device which controls a phase current of a motor by using drive voltage supplied to the motor, comprising:

• a control initiation-stop determination step of switching a state of the drive voltage to a stop state in which a control is stopped, a start state in which the control is executed, or an initiation state;
• and
• a drive voltage control step of controlling the drive voltage based on the state switched by the control initiation-stop determination step, wherein
• in the control initiation-stop determination step, when the state of the drive voltage is to be transitioned from the stop state to the start state, the state of the drive voltage is switched to the initiation state during the transition from the stop state to the start state,
• in the drive voltage control step, the drive voltage is controlled such that the phase current increases or decreases in the initiation state as time elapses, and
• in the control initiation-stop determination step, the state of the drive voltage is switched to the stop state when the phase current exceeds a threshold,
• wherein in the control initiation-stop determination step, a duration of the initiation state is set based on a value of the phase current exceeding the threshold such that a first duration set based on a first value of the phase current that is larger than a second value of the phase current is longer than a second duration set based on the second value.

A motor control method performed by a motor control device which controls a phase current of a motor by using drive voltage supplied to the motor, comprising:

• a control initiation-stop determination step of switching a state of the drive voltage to a stop state in which a control is stopped, a start state in which the control is executed, or an initiation state;
• and
• a drive voltage control step of controlling the drive voltage based on the state switched by the control initiation-stop determination step, wherein
• in the control initiation-stop determination step, when the state of the drive voltage is to be transitioned from the stop state to the start state, the state of the drive voltage is switched to the initiation state during the transition from the stop state to the start state,
• in the drive voltage control step, the drive voltage is controlled such that the phase current increases or decreases in the initiation state as time elapses,
• in the control initiation-stop determination step, the state of the drive voltage is switched to the stop state when temperature of a switching element configured to generate the drive voltage exceeds a threshold, and
• in the control initiation-stop determination step, a duration of the initiation state is set based on a value of the temperature exceeding the threshold such that a first duration set based on a first value of the temperature that is larger than a second value of the temperature is longer than a second duration set based on the second value.