Controller for permanent magnet synchronous motor

A controller for a permanent magnet synchronous motor comprising:

• a current command means for calculating current command values in respective phases of a stator from a command value of a D-axis current and a command value of a Q-axis current, thereby outputting the command values;
• an input application means for supplying a current to the respective phases based on the current command values in the respective phases;
• a dynamic/regenerative mode judging means for judging whether an operational mode of the permanent magnet synchronous motor is dynamic or regenerative;
• a Q-axis current command means for providing the command value of the Q-axis current;
• and
• a D-axis current command means for outputting the command value of the D-axis current based on the command value of the Q-axis current and a rotation speed in order to generate a dynamic reluctance torque equal to or larger than zero in the permanent magnet synchronous motor, in a case where the dynamic/regenerative mode judging means judges the operational mode to be regenerative and a rotation speed and a torque of the permanent magnet synchronous motor do not exist in a flux-weakening region.

A controller for a permanent magnet synchronous motor comprising:

• a current command means for calculating current command values in respective phases of a stator from a command value of a D-axis current and a command value of a Q-axis current, thereby outputting the command values;
• an input application means for supplying a current to the respective phases based on the current command values in the respective phases;
• a dynamic/regenerative mode judging means for judging whether an operational mode of the permanent magnet synchronous motor is dynamic or regenerative;
• a D-axis current command means for providing the command value of the D-axis current based on values for the regenerative mode in a case where the dynamic/regenerative mode judging means judges the operational mode to be regenerative, and for providing the command value of the D-axis current based on values for the dynamic mode in a case where the dynamic/regenerative mode judging means judges the operational mode to be dynamic;
• and
• a Q-axis current command means for reducing the command value of the Q-axis current in accordance with an increment of the command value of the D-axis current caused by a generation of a reluctance torque in a case where the command value of the D-axis current is not zero.

A controller for a permanent magnet synchronous motor comprising:

• a current command means for calculating current command values in respective phases of a stator from a command value of a D-axis current and a command value of a Q-axis current, thereby outputting the command values;
• an input application means for supplying a current to the respective phases based on the current command values in the respective phases;
• a saturation degree output means for producing a saturation degree indicating an additional amount of the current to be supplied to the respective phases by the input application means;
• a reference output means for outputting a reference value of the saturation degree;
• a judged value output means for outputting a judged value by subtracting the reference value of the saturation degree from the saturation degree;
• a voltage measuring means for measuring a voltage applied to an inverter, thereby outputting a value of the measured voltage;
• a D-axis current maximum value output means for outputting a maximum command value of the D-axis current based on the value of the measured voltage;
• a D-axis current command means for increasing the command value of the D-axis current when the judged value is positive;
• holding the command value of the D-axis current at the maximum value of the D-axis current when the increasing command value of the D-axis current becomes larger than the maximum value of the D-axis current;
• decreasing the command value of the D-axis current when the judged value is negative;
• and holding the command value of the D-axis current at a predetermined minimum value of the decreasing D-axis current when the decreasing command value of the D-axis current becomes smaller than the predetermined minimum value of the D-axis current;
• and
• a Q-axis current command means for providing a command value of the Q-axis current.

A controller for a permanent magnet synchronous motor comprising:

• a current command means for calculating current command values in respective phases of a stator from a command value of a D-axis current and a command value of a Q-axis current, thereby outputting the command values;
• an input application means for supplying a current to the respective phases based on the current command values in the respective phases;
• a voltage measuring means for measuring a voltage applied to an inverter, thereby outputting a value of the measured voltage;
• a D-axis current command means for reducing a maximum command value of the D-axis current provided by the D-axis current command means if the value of the measured voltage decreases;
• and
• a Q-axis current command means for providing a command value of the Q-axis current.

A controller for a permanent magnet synchronous motor comprising:

• a current command means for calculating current command values in respective phases of a stator from a command value of D-axis current and a command value of a Q-axis current, thereby outputting the command values;
• an input application means for supplying a current to the respective phases based on the current command values in the respective phases;
• a saturation degree output means for producing a saturation degree indicating an additional amount of the current to be supplied to the respective phases by the input application means;
• an operational state determining means for outputting one of two operational states where a first of the two operational states is indicative of a state in which operation of the motor is governed by predetermined efficiency requirements, and a second of the two operational states is indicative of a state in which the operation of the motor is governed by predetermined torque requirements;
• a reference output means for outputting a reference value of the saturation degree based on the operational state;
• a judged value output means for outputting a judged value by subtracting the reference value of the saturation degree from the saturation degree;
• a D-axis current command means for leading a current phase and increasing the command value of the D-axis current so that the judged value becomes zero when the judged value is positive;
• and
• a Q-axis current command means for providing a command value of the Q-axis current.

A controller for a permanent magnet synchronous motor comprising:

• a current command means for calculating current command values in respective phases of a stator from a command value of a D-axis current and a command value of a Q-axis current, thereby outputting the command values;
• an input application means for supplying a current to the respective phases based on the current command values in the respective phases;
• an operational state determining means for outputting one of two operational states where a first of the two operational states is indicative of a state in which operation of the motor is governed by predetermined efficiency requirements, and a second of the two operational states is indicative of a state in which the operation of the motor is governed by predetermined torque requirements;
• a D-axis current command means for providing a command value of the D-axis current so that a command value of the D-axis current in a case of the first operational state is smaller than a command value of the D-axis current in a case of the second operational state;
• and
• a Q-axis current command means for providing a command value of the Q-axis current.

A controller for a permanent magnet synchronous motor comprising:

• a current command means for calculating current command values in respective phases of a stator from a command value of a D-axis current and a command value of a Q-axis current, thereby outputting the command values;
• an input application means for supplying a current to the respective phases based on the current command values in the respective phases;
• a saturation degree output means for producing a saturation degree indicating an additional amount of the current supplied to the respective phases by the input application means;
• a reference output means for outputting;
• a D-axis reference output means for outputting a reference value of the D-axis in accordance with the saturation degree;
• a Q-axis reference output means for outputting a reference value of the Q-axis in accordance with the saturation degree;
• a D-axis judged value output means for outputting a judged value of the D-axis based on a value obtained by subtracting the reference value of the D-axis from the saturation degree;
• a Q-axis judged value output means for outputting a judged value of the Q-axis based on a value obtained by subtracting the reference value of the Q-axis from a processed value of the saturation degree;
• a D-axis current command means for increasing the command value of the D-axis current in a case where the judged value of the D-axis is positive;
• holding the command value of the D-axis current at a predetermined maximum value in a case where the increasing command value of the D-axis current becomes larger than the predetermined maximum value;
• decreasing the command value of the D-axis current in a case where the judged value of the D-axis is negative;
• and holding the command value of the D-axis current at a predetermined minimum value in a case where the command value of the decreasing command value of the D-axis current becomes smaller than the predetermined minimum value;
• a Q-axis current command means for providing a command value of the Q-axis current;
• and
• a Q-axis current variation means for decreasing the command value of the Q-axis current commanded by the Q-axis current command means and regarding the decreasing command value of the Q-axis current as a varied command value of the Q-axis current in a case where the judged value of the Q-axis is positive and the command value of the D-axis current is the predetermined maximum value;
• and for increasing the command value of the Q-axis current in a case where the judged value of the Q-axis is negative, the command value of the D-axis current is the predetermined maximum value, and the varied command value of the Q-axis current is equal to or smaller than the command value of the Q-axis current commanded by the Q-axis current command means.

A controller for a permanent magnet synchronous motor comprising:

• a current command means for calculating current command values in respective phases of a stator from a command value of a D-axis current and a command value of a Q-axis current, thereby outputting the command values;
• an input application means for supplying a current to the respective phases based on the current command values in the respective phases;
• a saturation degree output means for producing a saturation degree indicating an additional amount of the current to be supplied to the respective phases by the input application means;
• a reference output means for outputting a reference value of the saturation degree based on the operational state;
• a judged value output means for outputting a judged value obtained by subtracting the reference value of the saturation degree from the saturation degree;
• a first D-axis current command means for leading a current phase and increasing the command value of the D-axis current so that a judged value becomes zero if the judged value is positive;
• a failure detection means for detecting a failure of a circuit or an operation associated with the control of the motor;
• a second D-axis current command means for calculating the command value of the D-axis current based on a predetermined table or operation equation;
• a Q-axis current command means for providing a command value of the Q-axis current;
• and
• a D-axis current selection means for selecting the command value of the D-axis current output from the first D-axis current command means in a case where the failure detection means does not detect a failure of a circuit or an operation;
• and for selecting the command value of the D-axis current output from the second D-axis current command means in a case where the failure detection means detects a failure of a circuit or an operation.

A controller for a permanent magnet synchronous motor comprising:

• a current command means for calculating current command values in respective phases of a stator from a command value of a D-axis current and a command value of a Q-axis current, thereby outputting the command values;
• an input application means for supplying a current to the respective phases based on the current command values in the respective phases;
• a dynamic/regenerative mode judging means for judging whether an operational mode of the permanent magnet synchronous motor is dynamic or regenerative;
• a Q-axis current command means for providing the command value of the Q-axis current;
• and
• a D-axis current command means for outputting the command value of the D-axis current based on the command value of the Q-axis current and a rotation speed in order to generate a dynamic reluctance torque equal to or larger than zero in the permanent magnet synchronous motor, in a case where the dynamic/regenerative mode judging means judges the operational mode to be regenerative and a rotation speed and a torque of the permanent magnet synchronous motor do not exist in a flux-weakening region and, in a case where the dynamic/regenerative mode judging means judges the operational mode to be dynamic, the D-axis current command means outputs the command value of the D-axis current in an inverse code with respect to the code in the regenerative operational mode.