Claims
- 1. A cogging torque adjustment method for a power generator including a rotor having a permanent magnet rotated by a transmitted rotary drive force, a stator having a rotor accommodation hole, the rotor being disposed in the accommodation hole, a magnetic core, and a power-generating coil wound around the magnetic core, the magnetic core, stator and rotor constituting a first magnetic circuit, and a part of the stator around and adjacent to the rotor constituting a second magnetic circuit, the method comprising the steps of:prior to forming an inner notch on an inner periphery of the rotor accommodation hole, comparing the magnetic reluctance of the first magnetic circuit to the magnetic reluctance of the second magnetic circuit; when the magnetic reluctance of the first magnetic circuit is smaller, forming the inner notch on the inner periphery of the rotor accommodation hole of the stator within an angular range of ±45° around a magnetic flux direction of the first magnetic circuit at a rotation center of the rotor; and when the magnetic reluctance of the second magnetic circuit is smaller, forming the inner notch on the inner periphery of the rotor accommodation hole of the stator within an angular range of ±45° around a magnetic flux direction of the second magnetic circuit at a rotation center of the rotor.
- 2. A cogging torque adjustment method for a power generator including a rotor having a permanent magnet rotated by a transmitted rotary drive force, a stator having a rotor accommodation hole, the rotor being disposed in the accommodation hole, a magnetic core, and a power-generating coil wound around the magnetic core, the magnetic core, stator and rotor constituting a first magnetic circuit, and a part of the stator around and adjacent to the rotor constituting a second magnetic circuit, the method comprising the steps of:prior to forming a protrusion on an inner periphery of the rotor accommodation hole comparing the magnetic reluctance of the first magnetic circuit to the magnetic reluctance of the second magnetic circuit; when the magnetic reluctance of the first magnetic circuit is greater, forming the protrusion projecting toward the rotor on the inner periphery of the rotor accommodation hole of the stator within an angular range of ±45° around a magnetic flux direction of the first magnetic circuit at a rotation center of the rotor. and when the magnetic reluctance of the second magnetic circuit is greater, forming the protrusion projecting toward the rotor on the inner periphery of the rotor accommodation hole of the stator within angular range of ±45° around a magnetic flux direction of the second magnetic circuit at a rotation center of the rotor.
Priority Claims (2)
Number |
Date |
Country |
Kind |
2000-000925 |
Jan 2000 |
JP |
|
2000-314283 |
Oct 2000 |
JP |
|
CONTINUING APPLICATION DATA
This application is a divisional of U.S. patent application Ser. No. 10/361,164 filed Feb. 6, 2003, which is a divisional of application Ser. No. 09/754,970 filed on Jan. 5, 2001, now U.S. Pat. No. 6,541,882, the content of each of which are incorporated herein by reference.
US Referenced Citations (10)
Foreign Referenced Citations (6)
Number |
Date |
Country |
08-075873 |
Mar 1996 |
JP |
09-203785 |
Aug 1997 |
JP |
10-042532 |
Feb 1998 |
JP |
10-066321 |
Mar 1998 |
JP |
10-108450 |
Apr 1998 |
JP |
11-160463 |
Jun 1999 |
JP |