Motor magnetic pole position correction method
AssigneeOkuma Corporation
InventorYoichi Kawai
Life of this patent
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Abstract
A motor magnetic pole position correction method includes preventing a movement of a movable element of a direct drive motor by mechanical brake (step S9), generating a command that designates a position spaced or separated from the present position (step S10), detecting a torque command value of the direct drive motor (step S12), determining a magnetic pole position correction value based on a comparison between the detected torque command value and a predetermined threshold value (steps S14 and S16), storing the determined magnetic pole position correction value in a memory (step S18), and performing motor control using an electrical angle offset value obtained based on the magnetic pole position correction value stored in the memory.
Claims6
A motor magnetic pole position correction method for correcting a relative positional relationship between a movable element position of a direct drive motor and a movable element position detection value detected by a position detector attached to the direct drive motor, the method comprising:
- a step of preventing movement of a movable element of the direct drive motor by a mechanical brake;
- a step of inputting a position command that designates a position different from a present value as a commanded movable element position of the direct drive motor;
- a step of detecting a torque command value of the direct drive motor;
- a step of determining a magnetic pole position correction value based on a comparison between the detected torque command value and a predetermined threshold value;
- a step of storing the determined magnetic pole position correction value in a memory;
- and
- a step of performing motor control using an electrical angle offset value obtained based on the magnetic pole position correction value stored in the memory.
Dependencies are inferred from the claim text.