Rotary dynamoelectric machine having high-resistance rotor
阅读：420发布：2023-12-13
专利汇可以提供Rotary dynamoelectric machine having high-resistance rotor专利检索，专利查询，专利分析的服务。并且A rotary dynamoelectric machine having a generally annular stator including first and second primary windings oriented at 90* electrical phase relationship with respect to one another, the second winding having approximately 0.845 the number of effective turns of the first winding. An induction rotor of the machine has a cylindrical laminated ferromagnetic core positioned within the stator for rotation about a central axis thereof when the stator is energized by an a.c. power source. The rotor is of single-bar squirrel-cage construction having a plurality of electrically conductive bars each extending the length of the core adjacent the cylindrical surface thereof. Conductive end rings at the ends of the rotor electrically are connected to the ends of the bars at the respective ends of the core. The bars and end rings provide a secondary winding and are physically dimensioned such as to provide this secondary winding with a relatively high resistance, viz., at least twice the resistance of a rotor of conventional commercial design. The windings are interconnected with a source of single-phase a.c. power source to permit the machine to be used either as a self-starting rotary phase converter for supplying three-phase power to a load or as a motor having low inrush current.，下面是Rotary dynamoelectric machine having high-resistance rotor专利的具体信息内容。
1. A rotary dynamoelectric machine having superior electrical characteristics comprising: a generally annular stator including a first primary winding and a second primary winding oriented at 90* electrical phase relationship with respect to said first winding, said second winding having approximately 0.845 the number of effective turns of said first winding, said windings, being adapted to be interconnected to a source of single-phase a.c. power; and an induction rotor including a cylindRical laminated ferromagnetic core positioned within said stator for rotation about a longitudinal central axis thereof when said stator is energized by the power source, said rotor having a plurality of electrically conductive bars each extending the length of the core adjacent the cylindrical surface thereof, and conductive end rings at the ends of said rotor electrically connected to the ends of said bars at the respective ends of the core thereby to provide a secondary winding, the physical dimensions of said bars and said end rings being such that the resistance of said secondary winding, when calculated on a comparative basis with commercial conventionally designed three-phase induction motors of substantially the same horsepower rating and slip as said machine if comprising a motor, is at least approximately two times the resistance of the secondary winding provided by a squirrel-cage motor rotor of conventional commercial design.
2. A rotary dynamoelectric machine as set forth in claim 1 wherein the resistance of said secondary winding is approximately equal to from approximately two to three times the resistance provided by a squirrel-cage motor rotor of conventional commercial design.
3. A rotary dynamoelectric machine as set forth in claim 2 wherein said end rings are each of generally flat, washer-like form, having a generally uniform thickness along the longitudinal central axis of the rotor, said end ring thickness being approximately from two-thirds to one-fourth of the thickness of end rings of a squirrel-cage motor rotor of conventional commercial design.
4. A rotary dynamoelectric machine as set forth in claim 1 wherein said conductive bars are of generally circular cross section.
5. A rotary dynamoelectric machine as set forth in claim 4 wherein each of said bars has a portion of its surface along its length exposed at the periphery of the rotor.
6. A rotary dynamoelectric machine as set forth in claim 1 constituting a rotary phase converter and wherein at least a portion of said first winding is adapted for being connected across the a.c. power source, and wherein said second winding is adapted for being serially connected with a capacitance from one end of a portion of said first winding to an intermediate tap on said first winding, whereby said dynamoelectric machine constitutes a self-starting rotary phase converter providing three-phase a.c. power at three terminals comprising the opposite ends of portions of said first winding and the junctions between the capacitance and said second winding.
7. A rotary dynamoelectric machine as set forth in claim 1 constituting a motor and wherein said first winding is adapted to be connected with a capacitance across said a.c. source, said second winding being adapted to be connected across said source whereby relatively low inrush current is required upon starting.
8. A rotary dynamoelectric machine comprising: a generally annular stator including a first primary winding and a second primary winding oriented at 90* electrical phase relationship with respect to said first winding, said second winding having approximately 0.845 the number of effective turns of said first winding, said windings being adapted to be interconnected with a capacitance to a source of single-phase a.c. power; and an induction rotor including a cylindrical laminated ferromagnetic core positioned within said stator for rotation about a central axis thereof when said stator is energized by the power source, said rotor having a plurality of electrically conductive bars each extending the length of the core adjacent the cylindrical surface thereof and conductive end rings at the ends of said rotor electrically connected to the ends of said bars at the respective ends of the core thereby to provide a secondary winding, said bars and said end rings being configured and dimensioned such as to provide said secondary winding with a relatively high resistance whereby when the first winding is coNnected across the single-phase a.c. power source and the second winding is serially connected with a capacitance from one side of said a.c. source to an intermediate tap on said first winding, the dynamoelectric machine comprises a self-starting rotary phase converter and three-phase a.c. power is provided at three terminals comprising the opposite ends of portions of said first winding and the junction between the capacitance and said second winding; and whereby when said first winding and a capacitance are connected across said a.c. source and said second winding is connected across said a.c. source the dynamoelectric machine comprises a motor requiring relatively low inrush current upon starting.
9. A self-starting rotary phase converter comprising: a generally annular stator including a first primary winding and a second primary winding oriented at 90* electrical phase relationship with respect to said first winding, said second winding having approximately 0.845 the number of effective turns of said first winding, at least a portion of said first winding being adapted to be connected across a source of single-phase a.c. power, said second winding being serially connected with a capacitance from one end of a portion of said first winding to an intermediate tap on said first winding; and an induction rotor including a cylindrical laminated ferromagnetic core positioned within said stator for rotation about a central axis thereof when said stator is energized by said a.c. source, said rotor being of single-bar construction having a plurality of electrically conductive bars each extending the length of the core adjacent the cylindrical surface thereof, and conductive end rings at the ends of said rotor electrically connected to the ends of said bars at the respective ends of the core thereby to provide a secondary winding, the physical dimensions of said bars and said end rings being such that the resistance of said secondary winding, when calculated on a comparative basis with commercial conventionally designed three-phase induction motors of substantially the same horsepower rating and slip if said machine constituted a motor, is approximately at least two times the resistance of the secondary winding provided by a squirrel-cage motor rotor of conventional commercial design, whereby said rotary phase converter provides three-phase a.c. power at three terminals comprising the opposite ends of portions of said first winding and the junction between the capacitance and said second winding.
10. A rotary phase converter as set forth in claim 9 wherein the resistance of said secondary winding is approximately equal to from approximately two to three times the resistance provided by a squirrel-cage motor rotor of conventional commercial design.
11. A rotary phase converter as set forth in claim 9 wherein said first winding is constituted by a set of coils, at least one of said coils having a plurality of taps thereon, said intermediate tap comprising a preselected one of said plurality of taps, thereby to provide substantial phase balance of said three-phase a.c. power provided.
12. A rotary phase converter as set forth in claim 11 wherein said plurality of taps comprises a first tap located at approximately the midpoint of said first winding and a second of said taps located at approximately one-fourth of the span of said first winding between one end thereof and said first tap.
13. A rotary phase converter as set forth in claim 12 wherein said plurality of taps comprises a third tap located at approximately the midpoint of the span of said first winding between said first and second taps.
14. A rotary phase converter as set forth in claim 11 wherein said bars of the rotor are each partially exposed along the length thereof at said cylindrical surface of the core.
15. A rotary phase converter as set forth in claim 11 wherein each of said windings comprises multiple sets of coils associated with poles of said convertEr, said first winding having four such sets of coils connected end-to-end and constituting four portions of said first winding, there being a first junction between the first and second portions, a middle second junction between the second and third portions, and a third junction between the third and fourth portions, said second portion being provided with ones of said taps, said second winding also having four sets of interconnected coils.
16. A rotary phase converter as set forth in claim 15 wherein opposite ends of the second and third portions of said first winding are connected across the single-phase a.c. source which has a first voltage, the four sets of coils of said second winding being adapted for being connected in series with the capacitance from said second junction and said intermediate tap, two of the terminals for providing said three-phase a.c. power being constituted by opposite ends of the first and fourth portions of said first winding whereby said three-phase a.c. power is provided at a second voltage which is substantially twice said first voltage.
17. A rotary phase converter as set forth in claim 16 wherein the sets of coils of said second winding define a midpoint thereof at the junction between two of the sets of coils thereof whereby three-phase a.c. power of a voltage substantially equal to said first voltage is also provided at three terminals comprising said midpoint and said first and third junctions.
18. A rotary phase converter as set forth in claim 15 wherein opposite ends of the first and fourth portions of said first winding are connected across the single-phase a.c. source which has a first voltage, the four sets of coils of said second winding being connected such that there are two parallel-connected pairs of series-connected pairs thereof, all four of which sets are connected in series with the capacitance from one side of said a.c. source and said intermediate tap, two of the three terminals for providing said three-phase a.c. power being constituted by said second and third junctions whereby said three-phase a.c. power is provided at a second voltage which is substantially one-half said first voltage.
19. A motor comprising: a generally annular stator including a first primary winding and a second primary winding oriented at 90* electrical phase relationship with respect to said first winding, said second winding having approximately 0.845 the number of effective turns of said first winding, said first winding being adapted to be connected in series with a capacitance across a source of single-phase a.c. power, said second winding being connected across said a.c. source; and an induction rotor including a cylindrical laminated ferromagnetic core positioned within said stator for rotation about a central axis thereof when said stator is energized by said a.c. source, said rotor being of a single-bar construction having a plurality of electrically conductive bars each extending the length of the core adjacent the cylindrical surface thereof, and conductive end rings at the ends of said rotor electrically connected to the ends of said bars at the respective ends of the core thereby to provide a secondary winding, the physical dimensions of said bars and said end rings being such that the resistance of said secondary winding, when calculated on a comparative basis with commercial conventionally designed three-phase induction motors of substantially the same horsepower rating and slip as said motor, is approximately at least two times the resistance of the secondary winding provided by a squirrel-cage motor rotor of conventional commercial design, whereby said motor requires relatively low inrush current upon starting.
20. A motor as set forth in claim 19 wherein the resistance of said secondary winding is approximately equal to from approximately two to three times the resistance provided by a squirrel-cage motor rotor of conventional commercial design.
21. A motor as set forth in claim 19 wHerein each of said windings comprises a plurality of sets of coils, the sets of coils of said second winding defining two sections thereof, said sections being adapted alternatively for connection in parallel for normal operation of said motor on said a.c. power source having a first voltage, or for connection in series for normal operation of said motor on said a.c. power source having a second voltage substantially twice said first voltage.
22. A motor as set forth in claim 19 wherein said first winding includes a midpoint, one end of said second winding being adapted to be connected to said midpoint whereby said motor is adapted to be operated alternatively from a source of three-phase a.c. power by connecting thereto the opposite ends of said first winding and the remaining end of said second winding.
23. A motor as set forth in claim 19 wherein said motor is adapted to be operated from a source of two-phase a.c. power by connecting said first winding across one phase of said two-phase source and said second winding across the other phase of said two-phase a.c. source.
24. A motor system having extremely low inrush current upon motor starting, comprising: a motor, including a generally annular stator including a first primary winding and a second primary winding oriented at 90* electrical phase relationship with respect to said first winding, said second winding having approximately 0.845 the number of effective turns of said first winding, said first winding having a pair of sections each having half the number of effective number of turns of said second winding; an induction rotor including a cylindrical laminated ferromagnetic core positioned within said stator for rotation about a central axis thereof, said rotor having a plurality of peripheral parallel slots extending generally axially at the cylindrical surface of the core, respective electrically conductive bars in said slots each extending the length of said slots to provide single-bar construction, and conductive end rings at the ends of said rotor electrically connected to the ends of said bars at the respective ends of the core thereby to provide a secondary winding, the physical dimensions of said bars and said end rings being such as to provide said secondary winding with a relatively high resistance; and a capacitance; means for connecting one end of said first winding to one side of a source of single-phase a.c. power and the other end of said first winding through said capacitance to the other side of said a.c. source; and means for connecting the sections of said second winding in series circuit relationship across said a.c. source for starting of said motor, and for connecting said sections in parallel circuit relationship across said a.c. source for running of said motor following starting whereby the maximum inrush current upon motor starting is of approximately the same magnitude as the current supplied to said motor during normal full-load running thereof.
25. The method of operating a three-phase a.c. electrical load from a source of single-phase power comprising: winding the stator of a rotary dynamoelectric machine with a first primary winding and a second primary winding oriented at 90* electrical phase relationship with respect to said first winding and having approximately 0.845 the number of effective turns of said first winding; providing a single-bar rotor for rotation in the bore of said stator, the rotor having a laminated magnetic core and a plurality of electrically conductive bars each extending the length of the core and conductive end rings at the ends of the rotor electrically connected to the ends of the bars at the respective ends of the core thereby to provide a secondary winding; restricting the physical dimensions of said bars and said end rings such that the resistance of said secondary winding, when calculated on a comparative basis with commercial conventionally designed three-phasE induction motors of substantially the same horsepower rating and slip as said machine if comprising a motor, is approximately equal to from two to three times the resistance of the secondary winding provided by a squirrel-cage motor rotor of conventional commercial design; connecting said first winding to said a.c. source and said second winding in series with a capacitance from one side of said a.c. source to an intermediate tap on said first winding; and connecting said load to three terminals comprising the opposite ends of portions of said first winding and the junction between the capacitance and said second winding whereby three-phase a.c. power is supplied to said load.
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