초록 ▼

Disclosed is a pole-change type motor that provides a variable-speed (two-pole or four-pole type) operation system capable of reducing the load of the motor of the normal operation system and improving the cooling efficiency. In case of a quick operation, the motor switches over to the two-pole type

Disclosed is a pole-change type motor that provides a variable-speed (two-pole or four-pole type) operation system capable of reducing the load of the motor of the normal operation system and improving the cooling efficiency. In case of a quick operation, the motor switches over to the two-pole type according to the control of a relay section. At this time, the load of the motor is reduced by offsetting an abnormal magnetic field distribution formed due to the same polarity of adjacent main windings using compensation windings of an opposite polarity. If the quick operation is needed, the motor switches over to the two-pole type, and operates at a high speed to achieve the quick cooling. Then, if a standard operation is possible with the lapse of the predetermined time, the motor switches over to the four-pole type, and operates at a low speed to achieve an effective cooling.

대표청구항 ▼

1. A pole-change type motor comprising:a rotor;a stator for generating a torque of the rotor so as to perform a high-speed or low-speed operation of the motor through a pole change; anda relay section for controlling the pole change of the stator according to a load on the motor, the relay section c

1. A pole-change type motor comprising:a rotor;a stator for generating a torque of the rotor so as to perform a high-speed or low-speed operation of the motor through a pole change; anda relay section for controlling the pole change of the stator according to a load on the motor, the relay section comprising:a first relay section for switching to control an on/off operation of the motor;a second relay section for switching to change the pole of the stator from a two-pole type to a four-pole type and vice versa by changing wiring of the first and fourth main windings;a third relay section for switching to change a polarity by changing wiring of the first to fourth auxiliary windings, and the first and second compensation windings; anda fourth relay section for switching to control a start torque during a four-pole operation according to the switching operation of the third relay section.2. The pole-change type motor of claim 1, wherein the stator comprises:first to fourth main windings for generating the torque of the rotor by two poles or four poles;first to fourth auxiliary windings for generating a start torque and a rotative torque by supplying a magnetic flux orthogonal to a magnetic flux generated by the first to fourth main windings; andfirst and second compensation windings for compensating for a magnetic flux distortion generated between the same poles of the first to fourth main windings during a two-pole operation.3. The pole-change type motor of claim 2, wherein the first and second compensation windings are connected between the adjacent windings of the same polarity among the first to fourth main windings during the two-pole operation.4. The pole-change type motor of claim 2, wherein the first and second compensation windings are disconnected from the first to fourth main windings during a four-pole operation.5. The pole-change type motor of claim 2, wherein the first and second compensation windings compensate for a magnetic flux distortion generated in the first to fourth main windings.6. The pole-change type motor of claim 1, wherein the third relay section switches over to the first and second compensation windings during the two-pole operation.7. The pole-change type motor of claim 1, wherein the third relay section switches over to the first to fourth auxiliary windings during the four-pole operation.8. The pole-change type motor of claim 1, wherein the fourth relay section is turned on for a predetermined time during the four-pole operation according to the switching operation of the third relay section.9. The pole-change type motor of claim 1, the start torque according to the switching operation of the fourth relay section is controlled by changing wiring of a capacitor connected to the first auxiliary winding during the four-pole operation.10. The pole-change type motor of claim 1, wherein the wiring of first to fourth main windings is changed to form four poles through the second relay section during a standard operation of the rotor.11. The pole-change type motor of claim 1, wherein wiring of first to fourth main windings is changed to form two poles through a second relay section during a quick operation of the rotor.12. The pole-change type motor of claim 1, wherein during the high-speed operation of the rotor, the rotor initially operates by four poles during a predetermined number of rotations, and with the lapse of the predetermined number of rotations, the rotor operates by two poles through the pole change.13. A pole-change type motor comprising:a rotor;a stator including first to fourth main windings for generating a torque of the rotor by two poles or four poles, first to fourth auxiliary windings for smoothly effecting generation of a start torque and a rotative torque through an interaction by supplying a magnetic flux orthogonal to a magnetic flux generated by the first to fourth main windings, and first and second compensation windings for compensating for a magnetic flux distortion generated between the same poles of the first to fourth main windings during a two-pole operation; anda relay section for changing a polarity of the first to fourth main windings from the two poles to the four poles and vice versa, and switching a connection state of the first and second compensation windings.14. A pole-change type motor comprising:a rotor;a stator including first to fourth main windings for generating a torque of the rotor by two poles or four poles, first to fourth auxiliary windings for smoothly effecting generation of a start torque and a rotative torque through an interaction by supplying a magnetic flux orthogonal to a magnetic flux generated by the first to fourth main windings, and first and second compensation windings for compensating for a magnetic flux distortion generated between the same poles of the first to fourth main windings during a two-pole operation; anda relay section including a first relay section for switching to control an on/off operation of the motor, a second relay section for controlling to change a polarity of the stator from a two-pole type to a four-pole type and vice versa by changing wiring of the first to fourth main windings, a third relay section for controlling to apply a power to the first and second compensation windings during the two-pole operation and to apply the power to the first to fourth auxiliary windings during the four-pole operation, and a fourth relay section for controlling a connection of a capacitor to increase the start torque of an initial operation for a predetermined time during the four-pole operation.15. A pole-change type motor comprising:a rotor;a stator for generating rotor torque so as to perform a high-speed or low-speed motor operation depending on a selected number of poles; anda relay section for selecting the number of stator poles according to a load on the motor, wherein the relay section comprises:a first relay for controlling an on/off operation of the motor;a second relay for selecting the number of the stator poles by changing wiring of the main windings according to the load of the motor; anda third relay for selecting the number of the stator poles by selectively changing wiring of the auxiliary windings and the compensation windings according to the load of the motor.16. The pole-change type motor of claim 15, wherein the stator comprises:a plurality of main windings for generating the rotor torque depending on the selected number of stator poles;a plurality of auxiliary windings for supplying a magnetic flux orthogonal to a magnetic flux generated by the main windings; anda plurality of compensation windings for compensating for a magnetic flux distortion generated between same poles of the main windings.17. The pole-change type motor of claim 15, wherein the third relay switches over to the compensation windings if two stator poles are selected.18. The pole-change type motor of claim 15, wherein the third relay switches over the auxiliary windings if four stator poles are selected.19. The pole-change type motor of claim 15, further comprising a fourth relay between the third relay and the auxiliary windings.20. A pole-change type motor comprising:a rotor;a stator including a plurality of main windings for generating rotor torque depending on a number of stator poles, a plurality of auxiliary windings for supplying a magnetic flux orthogonal to a magnetic flux generated by the main windings, and a plurality of compensation windings for compensating for a magnetic flux distortion generated between same poles of the main windings; anda relay section changing wiring of the main windings and alternatively switching to the auxiliary windings and the compensation windings.21. The pole-change type motor of claim 20, wherein the relay section changes the wiring of the main windings and alternatively switches to the auxiliary windings and the compensation windings according to a load on the motor.22. The pole-change type motor of claim 20, wherein the relay section connects the main windings with the compensation windings in parallel or in series according to a torque intensity generated by the stator.23. The pole-change type motor of claim 20, wherein the relay section comprises:a first relay for controlling an on/off operation of the motor;a second relay for changing wiring of the main windings; anda third relay for alternatively switching to the auxiliary windings and the compensation windings.24. The pole-change type motor of claim 20, wherein the relay section switches over to the compensation windings during a two-pole operation.25. The pole-change type motor of claim 20, wherein the relay section switches over to the auxiliary windings during a four-pole operation.