Motor drive control device and motor drive control method
According to an aspect of the present disclosure, a motor drive control device driving a motor using position information detected by one sensor includes: a current detection unit detecting a magnitude of a coil current flowing through a coil of the motor; a rotation position detection unit detecting a rotation position of the motor based on the position information; and a hunting determination unit determining, based on the magnitude of the coil current, the rotation position of the motor, and a driving command for driving the motor, whether or not the motor is in a hunting condition.
1. A motor drive control device driving a motor using position information detected by one sensor, comprising:
a current detection unit detecting a magnitude of a coil current flowing through a coil of the motor;
a rotation position detection unit detecting a rotation position of the motor based on the position information; and
a hunting determination unit determining, based on the magnitude of the coil current, the rotation position of the motor, and a rotational speed command signal as a driving command for driving the motor, whether or not the motor is in a hunting condition, wherein
the hunting determination unit includes:
a current determination unit determining that the first determination condition is satisfied when the coil current is larger than the first current threshold; and
a position determination unit determining that the second determination condition is satisfied when a pseudo rotational speed of the motor obtained based on the detection result of the rotation position of the motor is slower than the predetermined rotational speed and the pseudo rotational speed of the motor is slower than the rotational speed specified by the rotational speed command signal, wherein
the hunting determination unit determines that the motor is in the hunting condition when the first determination condition is satisfied and the second determination condition is satisfied.
2. The motor drive control device according to claim 1 , wherein
the hunting determination unit determines that the motor is in the hunting condition when the first determination condition and the second determination condition are satisfied for a predetermined time.
3. The motor drive control device according to claim 1 , further comprising:
a predrive circuit driving an inverter circuit supplying power to the motor, wherein
the predrive circuit includes an overcurrent determination unit comparing the coil current with a second current threshold to determine whether or not the motor is in an overcurrent state, and
the second current threshold is larger than the first current threshold.
4. The motor drive control device according to claim 1 , further comprising:
a predrive circuit driving an inverter circuit supplying power to the motor; and
a motor control unit outputting to the predrive circuit a drive control signal for controlling the drive of the motor based on the driving command, wherein
the motor control unit outputs the drive control signal for stopping the motor when the hunting determination unit determines that the motor is in the hunting condition.
5. The motor drive control device according to claim 4 , wherein
the motor control unit maintains a state of outputting the drive control signal for stopping the motor for a predetermined first period of time when the hunting determination unit determines that the motor is in the hunting condition, and
the predetermined first period of time is longer than a predetermined second period of time from the time a control is performed to stop the motor when the motor is locked to the time a control is performed to restart the motor.
6. A motor drive control device driving a motor using position information detected by one sensor, comprising:
a current detection unit detecting a magnitude of a coil current flowing through a coil of the motor;
a rotation position detection unit detecting a rotation position of the motor based on the position information;
a hunting determination unit determining, based on the magnitude of the coil current, the rotation position of the motor, and a rotational speed command signal as a driving command for driving the motor, whether or not the motor is in a hunting condition, and
a predrive circuit driving an inverter circuit supplying power to the motor, wherein
the hunting determination unit includes:
a current determination unit determining that the first determination condition is satisfied when the coil current is larger than the first current threshold; and
a position determination unit determining that the second determination condition is satisfied when a pseudo rotational speed of the motor obtained based on the detection result of the rotation position of the motor is slower than the predetermined rotational speed and the pseudo rotational speed of the motor is slower than the rotational speed specified by the rotational speed command signal, wherein
the hunting determination unit determines that the motor is in the hunting condition when the first determination condition is satisfied and the second determination condition is satisfied, wherein:
the predrive circuit includes an overcurrent determination unit comparing the coil current with a second current threshold to determine whether or not the motor is in an overcurrent state, and
the second current threshold is larger than the first current threshold.
7. A motor drive control device driving a motor using position information detected by one sensor, comprising:
a current detection unit detecting a magnitude of a coil current flowing through a coil of the motor;
a rotation position detection unit detecting a rotation position of the motor based on the position information;
a hunting determination unit determining, based on the magnitude of the coil current, the rotation position of the motor, and a rotational speed command signal as a driving command for driving the motor, whether or not the motor is in a hunting condition;
a predrive circuit driving an inverter circuit supplying power to the motor; and
a motor control unit outputting to the predrive circuit a drive control signal for controlling the drive of the motor based on the driving command, wherein
the hunting determination unit includes:
a current determination unit determining that the first determination condition is satisfied when the coil current is larger than the first current threshold; and
a position determination unit determining that the second determination condition is satisfied when a pseudo rotational speed of the motor obtained based on the detection result of the rotation position of the motor is slower than the predetermined rotational speed and the pseudo rotational speed of the motor is slower than the rotational speed specified by the rotational speed command signal, wherein
the hunting determination unit determines that the motor is in the hunting condition when the first determination condition is satisfied and the second determination condition is satisfied, wherein
the motor control unit maintains a state of outputting the drive control signal for stopping the motor for a predetermined first period of time when the hunting determination unit determines that the motor is in the hunting condition, and
the predetermined first period of time is longer than a predetermined second period of time from the time a control is performed to stop the motor when the motor is locked to the time a control is performed to restart the motor.