Method for detecting/adjusting synchronous motor rotor position

• US 20060113949A1
• Filed: 01/27/2005
• Published: 06/01/2006
• Est. Priority Date: 01/30/2004
• Status: Active Grant

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Asao, Yoshihito, Nishimura, Shinji, Utsumi, Yoshinobu
• Granted Patent: US 7,388,346 B2
• Time in Patent Office: Days
• US Class Current: 318/723
• CPC Class Codes: H02K 19/36 Structural association of synchronous generators with auxiliary electric devices influencing the characteristic of the generator or controlling the generator, e.g. with impedances or switches
• CPC Class Codes: H02P 21/06 Rotor flux based control involving the use of rotor position or rotor speed sensors

Abstract

To obtain an adjustment method of rotor position detection of a synchronous motor with excellent productivity. An adjustment method of rotor position detection of a synchronous motor, wherein a synchronous motor having a stator wound around a stator coil and a rotor provided with magnetic poles, and a rotational position detector having a sensor rotor fixed to the rotor and a sensor stator disposed opposite to the sensor rotor for detecting a rotational position of the rotor are provided, and wherein an amount of deviation between the rotational position of the synchronous motor determined from an output of the rotational position detector and an actual rotational position of the synchronous motor is adjusted, the method comprising: a step of detecting the amount of deviation during rotation of the synchronous motor; and a step of mechanically adjusting a relative position between the rotational position detector and the synchronous motor based on a detected value of the amount of deviation, is provided.

Claims

1-6. -6. (canceled)

7. An adjustment method of rotor position detection of a synchronous motor, wherein

a synchronous motor having a stator wound around a stator coil and a rotor provided with magnetic poles, and

a rotational position detector having a sensor rotor fixed to said rotor and a sensor stator disposed opposite to the sensor rotor for detecting a rotational position of said rotor are provided, and wherein

an amount of deviation between said rotational position of said synchronous motor determined from an output of said rotational position detector and an actual rotational position of said synchronous motor is adjusted, said method comprising:

a step of detecting said amount of deviation during rotation of said synchronous motor; and

a step of mechanically adjusting a relative position between said rotational position detector and said synchronous motor based on a detected value of said amount of deviation.

8. The adjustment method of rotor position detection of a synchronous motor according to claim 7, further comprising:

a step of detecting the amount of deviation again after performing said step of adjusting the position of said rotational position detector by mechanically shifting in a rotational direction.

9. The adjustment method of rotor position detection of a synchronous motor according to claim 7, wherein said mechanical adjustment for adjusting the amount of deviation of said rotational position detector is performed while said synchronous motor is stopped.

10. The adjustment method of rotor position detection of a synchronous motor according to claim 7, wherein said mechanical adjustment for adjusting the amount of deviation of said rotational position detector is performed while said synchronous motor is rotating.

11. An adjustment method of rotor position detection of a synchronous motor, wherein

an amount of deviation between a rotational position of said synchronous motor determined from an output of a rotational position detector of said synchronous motor, on which vector control is performed, and an actual rotational position of said synchronous motor is adjusted, said method comprising:

a step of making a d-axis current command and a q-axis current command zero regardless of a torque command based on a phase correction command for commanding adjustment for a rotational position deviation;

a step of converting from three-phase current values of said synchronous motor to d-axis and q-axis currents;

a step of determining a difference between said d-axis current command and said q-axis current command and said d-axis and q-axis currents;

a step of determining a d-axis voltage command and a q-axis voltage command based on said difference;

a step of estimating said amount of deviation based on said d-axis voltage command and said q-axis voltage command; and

a step of adjusting a position of said rotational position detector based on said estimated amount of deviation by mechanically shifting in a rotational direction.

12. The adjustment method of rotor position detection of a synchronous motor according to claim 11, further comprising:

a step of detecting the amount of deviation again after performing said step of adjusting the position of said rotational position detector by mechanically shifting in a rotational direction.

13. The adjustment method of rotor position detection of a synchronous motor according to claim 11, wherein said mechanical adjustment for adjusting the amount of deviation of said rotational position detector is performed while said synchronous motor is stopped.

14. The adjustment method of rotor position detection of a synchronous motor according to claim 11, wherein said mechanical adjustment for adjusting the amount of deviation of said rotational position detector is performed while said synchronous motor is rotating.

15. An adjustment method of rotor position detection of a synchronous motor, wherein

an amount of deviation between a rotational position of said synchronous motor determined from an output of a rotational position detector of said synchronous motor, on which vector control is performed, and an actual rotational position of said synchronous motor is adjusted, said method comprising:

a step of making a d-axis current command and a q-axis current command zero regardless of a torque command based on a phase correction command for commanding adjustment for a rotational position deviation;

a step of converting from three-phase current values of said synchronous motor to d-axis and q-axis currents;

a step of determining a difference between said d-axis current command and said q-axis current command and said d-axis and q-axis currents;

a step of determining a d-axis voltage command and a q-axis voltage command based on said difference;

a step of estimating said amount of deviation by determining the amount of offset in which said d-axis voltage command becomes zero; and

a step of adjusting a position of said rotational position detector based on said estimated amount of deviation by mechanically shifting in a rotational direction.

16. The adjustment method of rotor position detection of a synchronous motor according to claim 15, further comprising:

a step of detecting the amount of deviation again after performing said step of adjusting the position of said rotational position detector by mechanically shifting in a rotational direction.

17. The adjustment method of rotor position detection of a synchronous motor according to claim 15, wherein said mechanical adjustment for adjusting the amount of deviation of said rotational position detector is performed while said synchronous motor is stopped.

18. The adjustment method of rotor position detection of a synchronous motor according to claim 15, wherein said mechanical adjustment for adjusting the amount of deviation of said rotational position detector is performed while said synchronous motor is rotating.