Synchronous reluctance motor |
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| 申请号 | US3576455D | 申请日 | 1969-11-05 | 公开(公告)号 | US3576455A | 公开(公告)日 | 1971-04-27 |
| 申请人 | GEN TIME CORP; | 发明人 | INGENITO MICHAEL J; | ||||
| 摘要 | A synchronous reluctance motor particularly useful as a clock drive motor. The motor includes a stator having an airgap and a rotor having spaced teeth of magnetic material which travel in a circular path and pass through the airgap of the stator. A magnetic flux is established periodically in the stator airgap in timed relation to an approaching tooth. The timing is such that flux buildup in the airgap occurs when an approaching tooth is closer to the airgap than a receding tooth, and the flux is approximately zero when the tooth is at the center of the airgap. Hence, there is no retarding force on a tooth as it leaves the airgap. The pulsating flux is established, in one embodiment, by a power source which supplies periodic current pulses to the stator winding. In another embodiment, the power source has a sinusoidal wave form, and a magnetic shunt paralleling the stator airgap converts the sinusoid into a series of current pulses for energizing the stator winding. | ||||||
| 权利要求 | 1. A synchronous motor system including: a stator of magnetic material providing at least a pair of opposed pole faces with an airgap therebetween; a rotor having a plurality of teeth of magnetic material adapted to rotate through said airgap; means for producing individual magnetic flux pulses, having a selected duty cycle significantly less than unity in said airgap; said flux pulses drawing successive ones of said teeth into said airgap to drive said motor. 2. A motor system according to claim 1 wherein the magnetic working area ratio of said rotor is substantially the same as said flux pulse duty cycle. 3. A synchronous motor according to claim 1, wherein: said teeth are radially extending for rotation through the airgap about an axis of rotation generally parallel to a line joining the pole faces. 4. A synchronous motor as set forth in claim 3, wherein the rotor teeth extend radially outwardly from a hub and have their peripheral ends offset in the direction of rotation at an angle to a radius of the rotor thereat. 5. A synchronous motor as called for in claim 4, wherein the pole faces are elongated in a direction generally normal to the direction of movement of rotor teeth through the airgap. 6. A synchronous motor as defined in claim 3, wherein the pole faces are elongated in a direction generally normal to the direction of movement of rotor teeth through the airgap and the axis of the peripheral end of each rotor tooth in said airgap forms an angle with said direction of elongation of the pole face. 7. A synchronous motor according to claim 6, wherein the peripheral end of each tooth immediately prior to entering the airgap is generally parallel to the elongated pole face. 8. A synchronous motor system including: a stator of magnetic material providing at least a pair of opposed pole faces with an airgap therebetween; a stator winding magnetically coupled to said stator; a rotor having a plurality of teeth of magnetic material adapted to rotate through said airgap; means for energizing said stator winding with successive current pulses at a selected current pulse duty cycle said current pulses establishing successive individual flux pulses in said airgap having a duty cycle significantly less than unity; said flux pulses drawing successive ones of said teeth into said airgap to drive said motor. 9. A motor system according to claim 8 wherein the magnetic working area ratio of said rotor is substantially the same as said current pulse duty cycle. 10. A motor system according to claim 8 wherein said means for energizing said stator winding includes: a source of electrical power; means coupled between said source of power and said stator winding for converting said source power into successive current pulses. 11. A motor system according to claim 10 wherein said source power is sinusoidal and said means for converting said source power into successive current pulses includes rectifier means. 12. A motor system according to claim 11 wherein the distance between adjacent teeth is at least two times the width of a single tooth. 13. A synchronous motor systEm as set forth in claim 10, wherein: said converting means comprises electronic switching means connected in circuit with the stator winding. 14. A synchronous motor system as defined in claim 13, wherein: said electronic switching means includes a pair of electrodes in series circuit with the stator winding and a control electrode responsive to said source of electrical power for periodically rendering the series circuit conductive between said electrode pair. 15. A synchronous motor system as claimed in claim 14, wherein: said source of electrical power includes electromechanical timing means electrically coupled to said switching means for establishing a frequency of oscillation of said source. 16. A synchronous motor system including: a stator of magnetic material providing at least a pair of opposed pole faces with an airgap therebetween; a rotor having a plurality of teeth of magnetic material adapted to rotate through said airgap; means for producing magnetic flux pulses in said airgap; said means including a source of current cyclically variable in amplitude and establishing a current cycle, and saturable magnetic shunt means affixed to said stator and parallel to said pole faces to divert a portion of the flux in said stator from said airgap during a significant portion of the current cycle, thereby to provide time-displaced flux pulses at the airgap constituting a flux duty cycle significantly less than unity: said flux pulses drawing successive ones of said teeth into said airgap to drive said motor. 17. A synchronous motor system as defined in claim 16, wherein: the shunt is operable to make the duty cycle of flux through the shunt means is greater than the duty cycle of flux at the airgap. 18. A synchronous motor system including: a stator of magnetic material, said stator including a base leg; a pair of parallel side legs, and end legs projecting inwardly toward each other from said side legs to form an airgap therebetween; a stator winding magnetically coupled to said stator; a rotor having a plurality of teeth of magnetic material adapted to rotate through said airgap; means for energizing said stator winding with a source of current cyclically variable in amplitude and establishing a current cycle; means for producing magnetic flux pulses in said airgap; said means including saturable magnetic shunt means disposed between said side legs of said stator to divert a portion of the flux in said stator from said airgap during a significant portion of the current cycle thereby to provide individual flux pulses at the airgap having a duty cycle significantly less than unity, said flux pulses drawing successive ones of said teeth into said airgap to drive said motor. 19. A motor system according to claim 18 wherein the cross-sectional area of said magnetic shunt means is substantially less than the cross-sectional area of said stator legs. 20. A motor system according to claim 18 wherein said means for energizing said stator winding includes a source of sinusoidal current connected to said stator winding. 21. A motor system according to claim 18 wherein: said magnetic shunt means saturates before the flux in said stator reaches its maximum value but after the flux in said stator reaches a significant portion of such maximum value. 22. A motor system according to claim 18 wherein: the magnetic working area ratio of said rotor teeth is approximately 1:3; and the duty cycle of said magnetic flux pulses is approximately 1: 2. |
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