MAGNETIZING MOTOR AND MAGNETIZING METHOD THEREOF

Abstract

A magnetizing motor having a permanent magnet body covering an outer circumferential surface of a rotor body, includes a speed detecting unit that detects a speed of the magnetizing motor; and a controlling unit that compares the speed detected by the speed detecting unit with a reference speed, and outputs a magnetizing control signal based on the result of the comparison.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The above, and other objects, features, and advantages of the present invention will be made apparent form the following description of the preferred embodiments, given as nonlimiting examples, with reference to the accompanying drawings in which:

FIG. 1 is a driving circuit diagram showing a magnetizing motor in accordance with the prior art;

FIG. 2 is a graph showing a function of the magnetizing motor of FIG. 1

FIG. 3 is a circuit diagram showing a magnetizing motor according to the present invention;

FIG. 4 is a waveform showing a current applied to a magnetizing coil of FIG. 3 according to a first embodiment of the present invention;

FIG. 5 is a waveform showing an rpm of the magnetizing motor of FIG. 4 according to time;

FIG. 6 is a waveform showing a current applied to a magnetizing coil of FIG. 3 according to a second embodiment of the present invention;

FIG. 7 is a flowchart showing a magnetizing method for a magnetizing motor according to the first embodiment of the present invention;

FIG. 8 is a flowchart showing a magnetizing method for a magnetizing motor according to the second embodiment of the present invention; and

FIG. 9 is a waveform showing an rpm of the magnetizing motor of FIG. 8 according to time.

Claims

1. A magnetizing motor having a permanent magnet body covering an outer circumferential surface of a rotor body, said magnetizing motor comprising: a speed detecting unit that detects a speed of the magnetizing motor; anda controlling unit that compares the speed detected by the speed detecting unit with a reference speed, and outputs a magnetizing control signal based on the result of the comparison.

2. The magnetizing motor of claim 1, wherein when the detected speed is consistent with the reference speed, the controlling unit outputs a magnetizing control signal to generate a magnetizing current of several cycles for a constant time.

3. The magnetizing motor of claim 1, wherein when the detected speed is consistent with the reference speed, the controlling unit outputs a magnetizing control signal to generate a magnetizing current of one cycle with a constant interval.

4. The magnetizing motor of claim 1, further comprising a storing unit that stores a reference speed to generate a magnetizing current.

5. The magnetizing motor of claim 1t wherein the reference speed corresponds to 75%-80% of a synchronous speed.

6. The magnetizing motor of claim 1, further comprising: a switching unit switched by the magnetizing control signal, that conducts a magnetizing current of several cycles for a constant time; anda magnetizing coil that generates flux by the magnetizing current of several cycles and thus magnetizes the permanent magnet body.

7. The magnetizing motor of claim 1, further comprising: a switching unit switched by the magnetizing control signal, that conducts a magnetizing current of one cycle for a constant time with a constant interval; anda magnetizing coil that generates flux by the magnetizing current of one cycle and thus magnetizes the permanent magnet body.

8. A magnetizing motor having a permanent magnet body covering an outer circumferential surface of a rotor body, said magnetizing motor comprising: a speed detecting unit that detects a speed of the magnetizing motor;a controlling unit that compares the speed detected by the speed detecting unit with a reference speed, and outputs a magnetizing control signal based on the result of the comparison;a switching unit switched by the magnetizing control signal, that conducts a magnetizing current of several cycles for a constant time; anda magnetizing coil that generates flux by the magnetizing current of several cycles and magnetizes the permanent magnet body.

9. The magnetizing motor of claim 8, wherein when the detected speed is consistent with the reference speed, the controlling unit outputs a magnetizing control signal to generate a magnetizing current of several cycles for a constant time,

10. The magnetizing motor of claim 8, further comprising a storing unit that stores a reference speed to generate a magnetizing current.

11. The magnetizing motor of claim 8, wherein the reference speed corresponds to 75%-80% of a synchronous speed.

12. A magnetizing motor having a permanent magnet body covering an outer circumferential surface of a rotor body, the magnetizing motor comprising: a speed detecting unit that detects a speed of the magnetizing motor;a controlling unit that compares a speed detected by the speed detecting unit with a reference speed, and outputs a magnetizing control signal based on the result of the comparison;a switching unit switched by the magnetizing control signal, that conducts a magnetizing current of one cycle for a constant time with a constant interval; anda magnetizing coil that generates flux by the magnetizing current of one cycle and thus magnetizes the permanent magnet body,

13. The magnetizing motor of claim 12, wherein when the detected speed is consistent with the reference speed, the controlling unit outputs a magnetizing control signal to generate a magnetizing current of one cycle for a constant time with a constant interval.

14. The magnetizing motor of claim 12, further comprising a storing unit that stores a reference speed to generate a magnetizing current.

15. The magnetizing motor of claim 12, wherein the reference speed corresponds to 75%-80% of a synchronous speed.

16. A magnetizing method for a magnetizing motor having a permanent magnet body covering an outer circumferential surface of a rotor body, the method comprising: detecting a speed of the rotor;comparing the detected speed with a reference speed; andwhen the detected speed is consistent with the reference speed, applying a magnetizing current of several cycles to a magnetizing coil for a constant time, thereby magnetizing the permanent magnet body.

17. The method of claim 16, further comprising storing a reference speed preset to generate a magnetizing current.

18. The method of claim 16, wherein the reference speed corresponds to 75%-80% of a synchronous speed.

19. A magnetizing method for a magnetizing motor having a permanent magnet body covering an outer circumferential surface of a rotor body, the method comprising: detecting a speed of the rotor;comparing the detected speed with a reference speed; andwhen the detected speed is consistent with the reference speed, applying a magnetizing current of one cycle to a magnetizing coil for a constant time with a constant interval, thereby magnetizing the permanent magnet body.

20. The method of claim 19, further comprising storing a reference speed preset to generate a magnetizing current.

21. The method of claim 19, wherein the reference speed corresponds to 75%-80% of a synchronous speed.