Torque tool with synchronous reluctance motor
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B23Q-005/00
B25B-023/147
B25B-021/00
H02K-007/14
H02K-019/10
출원번호
US-0117511
(2012-05-28)
등록번호
US-9676086
(2017-06-13)
우선권정보
GB-1108995.0 (2011-05-27)
국제출원번호
PCT/GB2012/051200
(2012-05-28)
§371/§102 date
20131113
(20131113)
국제공개번호
WO2012/164276
(2012-12-06)
발명자
/ 주소
Pollock, Charles
Pollock, Helen
출원인 / 주소
Norbar Torque Tools Ltd.
대리인 / 주소
Renner, Otto, Boisselle & Sklar, LLP
인용정보
피인용 횟수 :
0인용 특허 :
21
초록▼
A torque tool includes an electrical machine drive system, an electronic controller and a gear system. The drive system includes a rotor and a stator. The rotor includes a pattern of regions of relatively high magnetic permeability interspersed with regions of relatively low magnetic permeability ex
A torque tool includes an electrical machine drive system, an electronic controller and a gear system. The drive system includes a rotor and a stator. The rotor includes a pattern of regions of relatively high magnetic permeability interspersed with regions of relatively low magnetic permeability extending generally parallel to the motor shaft such that there is a plurality of magnetic poles distributed circumferentially around the motor shaft. The stator includes electrical windings dispersed in slots disposed around an inner surface of the stator, the slots extending generally parallel to the motor shaft such that, when current flows in the windings, a stator magnetic field generated by the current has the same number of magnetic poles as the rotor. The electronic controller is configured to control the current flow in the stator windings to cause the stator poles to rotate in synchronism with rotation of the motor.
대표청구항▼
1. A torque tool for applying a controlled torsional moment to a mechanical device, comprising: an electrical machine drive system comprising a synchronous reluctance motor, the synchronous reluctance motor comprising: a rotor attached to a motor shaft, the rotor having a pattern of regions of relat
1. A torque tool for applying a controlled torsional moment to a mechanical device, comprising: an electrical machine drive system comprising a synchronous reluctance motor, the synchronous reluctance motor comprising: a rotor attached to a motor shaft, the rotor having a pattern of regions of relatively high magnetic permeability extending parallel to the motor shaft, interspersed with regions of relatively low magnetic permeability extending parallel to the motor shaft in such a way that there is a plurality of magnetic poles distributed circumferentially around the motor shaft; anda stator arranged around the rotor and comprising electrical windings dispersed in slots disposed around an inner surface of the stator, the slots extending parallel to the motor shaft such that, when current flows in the windings, a stator magnetic field generated by the current has the same number of magnetic poles as the rotor; andan electronic controller configured to control the current flow in the stator windings to cause the magnetic poles of the stator magnetic field to rotate in synchronism with rotation of the motor until the controlled torsional moment has been applied to the mechanical device,wherein the drive system further comprises a gear system mechanically coupled to the motor shaft and configured to apply the torsional moment to the device. 2. The torque tool of claim 1, wherein each region of relatively low magnetic permeability is a radially extending slot in the rotor. 3. The torque tool of claim 1, wherein each region of relatively high magnetic permeability is a radially extending solid tooth in the rotor. 4. The torque tool of claim 1, wherein the rotor and stator each have six or fewer magnetic poles. 5. The torque tool of claim 1, wherein the rotor and stator each have four magnetic poles. 6. The torque tool of claim 1, wherein the stator comprises eighteen or fewer slots. 7. The torque tool of claim 1, wherein the stator comprises twelve slots. 8. The torque tool of claim 1, wherein each slot contains windings carrying current of at least two different phases. 9. The torque tool of claim 1, wherein a coil pitch of the electrical windings is less than the pitch of the magnetic poles of the stator. 10. The torque tool of claim 1, wherein the electronic controller includes an angle monitor configured to measure the angle turned by the drive system and thereby estimate the angle turned by an output shaft of the gear system and the torque supplied by the gear system. 11. The torque tool of claim 10, further comprising means for communicating the angle turned by the output shaft to a user of the tool. 12. The torque tool of claim 1, wherein the electronic controller includes a torque monitor configured to monitor the current supplied to the drive system and thereby estimate the torque supplied by the drive system and thereby estimate the torque supplied by the gear system. 13. The torque tool of claim 10, wherein the electronic controller includes a current controller configured to reduce the current supplied to the drive system as the estimated torque supplied by the gear system approaches a target torque of the torque tool in order to prevent the supplied torque exceeding the target torque. 14. The torque tool of claim 1, wherein the rotor comprises a plurality of laminated sheets attached to the motor shaft, each sheet being perpendicular to a longitudinal axis of the motor shaft and having the pattern of regions of relatively high magnetic permeability circumferentially interspersed with regions of relatively low magnetic permeability. 15. The torque tool of claim 1, wherein the rotor has no electrical windings or magnets thereon. 16. The torque tool of claim 1, wherein the rotor is formed from steel. 17. The torque tool of claim 1, wherein the electronic controller is configured to provide a sinusoidally varying current to the windings. 18. The torque tool of claim 1, configured to drive the motor shaft at speeds above about 1,000 rpm. 19. The torque tool of claim 1, configured to drive the motor shaft at speeds up to 100,000 rpm. 20. A torque tool comprising a synchronous reluctance motor for driving an output shaft via a gear mechanism. 21. The torque tool of claim 20, further comprising an angle monitor for measuring an angle turned by the motor and thereby estimating an angle turned by the output shaft. 22. The torque tool of claim 1, configured to drive the motor shaft at speeds above about 10,000 rpm.
Bartos Ronald P. (Menomonee Falls WI) Houle Timothy H. (Wauwatosa WI) Johnson J. Herbert (Tipp City OH), Switched reluctance motor with sensorless position detection.
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