Abnormality detecting system and abnormality detecting method for rotor position detection means, and motor control system

A method for detecting an abnormality in rotor position detecting means, comprising:

• calculating an instantaneous speed and an average speed of a motor on the basis of an output value from the rotor position detecting means;
• calculating an absolute value of a difference between the instantaneous speed and the average speed;
• comparing the calculated absolute value with a set value;
• and
• responsive to a determination that the absolute value of the difference is greater than the set value, signaling an abnormality in the rotor position detecting means.

A method for detecting an abnormality in rotor position detecting means, comprising;

• calculating an average speed of a motor on the basis of an output value from the rotor position detecting means;
• comparing the calculated average speed with a set value;
• and
• responsive to a determination that the average speed is greater than the set value, signaling an abnormality in the rotor position detecting means.

A motor control system comprising:

• rotor position detecting means for detecting a magnetic pole position of a motor and for generating pole position signals representative of the detected magnetic pole position,
• torque instruction value detecting means for detecting a torque command to the motor and for generating a torque command signal,
• a PWM signal control device for outputting a PWM signal based on the pole position and torque command signals,
• an inverter for converting direct current from a battery to alternating current and for outputting an alternating current corresponding to the PWM signal from the PWM signal control device to the motor,
• speed calculating means for calculating instantaneous speed and average speed of the motor based on the pole position signals,
• abnormality detecting means for comparing an absolute value of a difference between the instantaneous speed and average speed of the motor with a set value and for determining an abnormality in the rotor position detecting means as an absolute value of the difference greater than the set value, and
• interruption means for, responsive to a determination of an abnormality by the abnormality detecting means interrupting a PWM signal from the PWM signal control device.

An apparatus for rotor position sensing with abnormality detection, comprising:

• rotor position detecting means for detecting a magnetic pole position of a motor;
• speed calculating means for calculating average speed of the motor on the basis of an output value generated by the rotor position detecting means;
• and
• abnormality detecting means for comparing the calculated average speed with a set value and for determining an abnormality in the rotor position detecting means as a calculated average speed greater than the set value.

A motor control system comprising:

• rotor position detecting means for detecting a magnetic pole position of a motor and for generating pole position signals representative of the detected magnetic pole position;
• torque instruction value detecting means for detecting a torque command to the motor and for generating a torque command signal;
• a PWM signal control device for outputting a PWM signal based on the pole position and torque command signals;
• an inverter for converting direct current from a battery to alternating current and for outputting an alternating current corresponding to the PWM signal from the PWM signal control device to the motor;
• speed calculating means for calculating average speed of the motor based on the pole position signals;
• abnormality detecting means for comparing the calculated average speed with a set value and for determining an abnormality in the rotor position detecting means as a calculated average speed greater than the set value;
• and
• interruption means for, responsive to a determination of an abnormality by the abnormality detecting means, interrupting a PWM signal from the PWM control device.