Driving device for synchronous motor

A driving device for a motor comprising:

• a synchronous motor;
• an inverter impressing an arbitrary AC on said motor;
• a means for providing said motor with a rotation number command;
• a means for calculating AC phase of said motor based on said rotation number command;
• a means for providing a current command Id* on dc axis, which is assumed as a magnetic pole axis inside said motor, and a current command Iq* on qc axis, which is orthogonal to said dc axis;
• a means for calculating voltage commands on said dc/qc axes based on said current commands and said rotation number command;
• and
• a means for calculating a state quantity corresponding to an axis error between said d axis, which is an actual magnetic pole axis of said motor, and said dc axis, and correcting said AC phase using said state quantity;
• wherein said driving device for a motor sends a control signal to said inverter based on said voltage commands to control said motor, and said Iq* is generated based on the state quantity corresponding to the axis error between said d axis and said dc axis when said Iq* of the qc axis component is calculated.

A driving device for a motor comprising:

• a synchronous motor;
• an inverter impressing an arbitrary AC on said motor;
• a means for providing said motor with a rotation number command;
• a means for calculating AC phase of said motor based on said rotation number command;
• a means for providing a current command Id* on dc axis, which is assumed as a magnetic pole axis inside said motor, and a current command Iq* on qc axis, which is orthogonal to said dc axis;
• a means for calculating voltage commands on said dc/qc axes based on said current commands and said rotation number command;
• and
• a means for calculating a state quantity corresponding to an axis error between said d axis, which is an actual magnetic pole axis of said motor, and said dc axis, and correcting said AC phase using said state quantity;
• wherein said driving device for a motor sends a control signal to said inverter based on said voltage commands to control said motor, and said Iq* is generated based on a correcting quantity for correcting said AC phase when said Iq* of the qc axis component is calculated.