Claims
- 1. A power generator comprising:
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; and further comprising a protrusion projecting toward the rotor formed 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.
- 2. The power generator according to claim 1, wherein the protrusion is formed within an angular range of ±10° around the magnetic flux direction of the first magnetic circuit at the rotation center of the rotor.
- 3. The power generator according to claim 2, wherein the protrusion is formed in the magnetic flux direction of the first magnetic circuit at the rotation center of the rotor.
- 4. The power generator according to claim 1, further comprising an oscillating weight, and a power-generating gear train that provides said transmitted rotary drive force to the rotor by transmitting a rotation of the oscillating weight.
- 5. A timepiece comprising:
a power generator comprising:
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; and further comprising a protrusion projecting toward the rotor formed 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; a time display; and a processor for actuating said time display by an electric energy generated by the power generator.
- 6. An electronic device comprising:
a power generator comprising:
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; and further comprising a protrusion projecting toward the rotor formed 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 a processor actuated by an electric energy generated by the power generator.
- 7. A power generator comprising:
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; and further comprising a protrusion projecting toward the rotor formed 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.
- 8. The power generator according to claim 7, wherein the protrusion is formed within an angular range of ±10° around the magnetic flux direction of the second magnetic circuit at the rotation center of the rotor.
- 9. The power generator according to claim 8, wherein the protrusion is formed in the magnetic flux direction of the second magnetic circuit at the rotation center of the rotor.
- 10. The power generator according to claim 7, further comprising an oscillating weight, and a power-generating gear train that provides said transmitted rotary drive force to the rotor by transmitting a rotation of the oscillating weight.
- 11. A timepiece comprising:
a power generator comprising:
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; and further comprising a protrusion projecting toward the rotor formed 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; a time display; and a processor for actuating said time display by an electric energy generated by the power generator.
- 12. An electronic device comprising:
a power generator comprising:
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; and further comprising a protrusion projecting toward the rotor formed 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; and a processor actuated by an electric energy generated by the power generator.
- 13. 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.
- 14. 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
[0001] This application is a divisional of U.S. patent application Ser. No. 09/754,970 filed Jan. 5, 2001, the contents of which are incorporated herein by reference.
Divisions (1)
|
Number |
Date |
Country |
Parent |
09754970 |
Jan 2001 |
US |
Child |
10361164 |
Feb 2003 |
US |