JP2000232757A - Magnetization method for motor for compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a magnetization method in which the magnet of a motor for a compressor is magnetized uniformly. SOLUTION: In this magnetization method of a motor 30 for a compressor, 3n pieces [(n) represents a positive number of 2 or higher] of magnetic pole teeth 33a, 33b, etc. are formed in a stator 31, multilayer windings 35Ua, 35Va, etc. which are wound on the magnetic pole teeth 33a, 33b, etc. are three-phase connected, and 2 m pieces [(m) represents a positive number of 2 or higher] of unmagnetized magnets 38a, 38b, etc. which are provided at a rotor 36 are magnetized by the multilayer windings 35Ua, 35Va, etc. In this case, in a first magnetization treatment, the central part of the magnet 38a is situated in the central part of the prescribed magnetic pole tooth 33a, a magnetization current is made to flow, and a magnetization treatment is conducted. In the next magnetization treatment, the rotor 36 is turned by 180 deg./m, the polarity of the current is made reverse from that in the first magnetization treatment, a magnetizing current is made to flow, so that the unmagnetized magnet 33b is magnetized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of magnetizing a motor for a compressor, and more particularly to a method of magnetizing a non-magnetized magnet provided in a rotor. It is.

[0002]

2. Description of the Prior Art A compressor motor 10 has 24 slots 1 as shown in FIG.
1 is provided, and the slot 11
, Three-phase four-pole windings 13U, 13V, and 13W are distributedly wound.

[0003] A rotor 15 having four magnets 14 at an angle of 90 ° is disposed inside the stator 12.
The compressor of the refrigeration cycle is driven.

The magnets 14 of the rotor 15 are fitted into four arc-shaped holes 16 without being magnetized. After the rotor 15 is assembled inside the stator 12, a DC current flows through the windings 13U and the like, and the magnets 14 are attached. It is magnetized.

In order to perform the magnetization, the winding 13U and the like are connected in two phases as shown in FIG. 7, and are magnetized by passing a DC current I0 from a DC power supply 17.

When a DC current I0 is applied to the winding 13U or the like, 24
In the electric motor 10 having the slots 11, the magnetic flux as shown by the arrow in FIG.
4 is magnetized with a uniform magnetization amount M0 as shown by the characteristic curve in FIG.

However, the stator 21 shown in FIG.
When magnetized by the multi-layered windings 24Ua, 24Ub, 24Va, 24b having the slots 22 and the six magnetic pole teeth 23 and connected in two phases, not only an uneven magnetic flux is generated as shown in FIG. As shown in FIG.
This results in lower and different magnetization amounts M1 and M2.

For this reason, the DC current I0 has been increased by about twice in order to increase the amount of magnetization. However, in this case, a multi-layer in which the DC current 2I0 in the same direction flows in the same slot 22 is used. A large mutual attraction force F is generated in the windings 24Ua, 24Va, etc.
a, 24Va, etc. may be deformed as shown in FIG.

When this deformation increases, the windings 24Ua, 24U
Not only does Va and the like come into contact with each other, causing dielectric breakdown, but also a large force is applied to the corner 27a of the insulating bobbin 27 around which the windings 24Ua and 24Va are wound and the root of the flange, which cracks and causes a ground fault. Had the problem of causing

In order to avoid these, the multilayer winding 24Ua, 2
When 4Ub, 24Va, 24b, etc. are connected in three phases as shown in FIG. 13 and a DC current I0 flows from the DC power supply 28, the multilayer windings 24Ua, 24Ub become I0, but the multilayer winding 24V
In the portions of a, 24Vb, 24Wa and 24Wb, the value is 1 / 2I0.

These multilayer windings 24Ua, 24Ub, 24Va,
As shown in FIG.
The portions Ua and 24Ub and the portions such as the multilayer windings 24Va and 24Vb are not only uneven but also have different sizes.

In addition, the multilayer winding 24Ua of the stator 21
Position of 24Ub, 24Va, 24Vb etc. and magnet 2 of rotor 25
There is a problem that the amount of magnetization greatly differs depending on the position of No. 6, and a compressor motor with excellent quality cannot be obtained.

Accordingly, the present invention provides a three-phase connection of the stator multi-layer windings, and magnetizes the magnets of the rotor with the positions of the multi-layer windings in a fixed relationship, thereby removing unmagnetized magnets. It is an object of the present invention to provide a method of magnetizing a compressor electric motor that is magnetized uniformly and with a large magnetization amount.

[0014]

According to a first aspect of the present invention, 3n (n is a positive number of 2 or more) magnetic pole teeth are formed on a stator, and a multi-layer winding wound around the magnetic pole teeth is connected in three phases. In the method of magnetizing a compressor motor for magnetizing 2 m (m is a positive number of 2 or more) unmagnetized magnets provided on the rotor by the multilayer winding, the first magnetizing process is The center of the magnet 1 is positioned at the center of a predetermined magnetic pole tooth, and a magnetizing current is supplied to perform magnetizing processing. In the next magnetizing processing, the rotor is rotated by 180 ° / m to make the polarity of the current the first. Conversely, the present invention provides a method of magnetizing a motor for a compressor, characterized in that a magnetizing current is passed to magnetize an unmagnetized magnet.

According to a second aspect of the present invention, there is provided an electric motor for a compressor, wherein the stator has six magnetic pole teeth, and the rotor has four non-magnetized magnets. The present invention provides a magnetizing method.

Further, in the compressor according to the present invention, the center of one magnet is located at the center of the magnetic pole teeth, and the end of the other magnet is located at the center of the magnetic pole teeth. The present invention provides a method for magnetizing a motor for a vehicle.

Further, the invention of claim 4 provides a method for magnetizing a compressor motor, wherein each magnet is formed in an arc shape.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for magnetizing a compressor motor according to the present invention will be described below with reference to the drawings.

The compressor motor 30 of the present invention is provided with an annular stator 31 as shown in FIG. The stator 31 is formed of a laminated thin iron plate, and has six equally spaced slots 32 formed therein. Six radially extending magnetic pole teeth 33 are provided between the slots 32.
a, 33b, 33c, 33d, 33e, 33f are formed, and an insulating bobbin 34 is mounted on these.

Flanges 34a, 34a are provided on the inner and outer sides of the insulating bobbin 34, and the stator 3
1. Three-phase multilayer windings 35Ua, 35Ub, 35V from the inner peripheral side of 1
a, 35 Vb, 35 Wa, and 35 Wb are wound to generate a rotating magnetic field.

A rotor 36 is provided on the inner periphery of the annular stator 31.
And a compressor (not shown) is rotated by a rotating magnetic field generated by the multilayer winding 35Ua and the like.

The rotor 36 is formed by laminating thin iron plates.
Four arc-shaped holes 37 extending in the axial direction and arranged at equal intervals are formed in the outer peripheral portion so that the arc surface faces the center. Non-magnetized magnets 38a, 38b, 38c, 38d are fitted into the arc-shaped holes 37, and are magnetized by the multilayer winding 35Ua or the like.

Multilayer windings 35Ua, 35Ub, 35Va, 35V
b, 35Wa, 35Wb are connected in three phases as shown in FIG.
The DC current I0 from the DC power supply 39 is applied to the multilayer windings 35Ua, 35U.
Ub, divide to 1 / 2I0 and multi-layer winding 35Va, 35V
b, 35Wa, 35Wb.

The method of magnetizing the electric motor 30 for a compressor constructed as described above will be described with reference to FIGS. 2, 3, 4 and 5. FIG.

A bobbin 34 is mounted on the magnetic pole teeth 33a, 33b, etc. of the stator 31, and a multilayer winding 34Ua, 34Ub, 34
Wrap Va etc. The rotor 3 having the arc-shaped hole 37 fitted with unmagnetized magnets 38a, 38b, 38c, 38d is fitted on the inner periphery of the stator 31 on which the multilayer windings 34Ua, 34Ub and the like are wound.
6 is incorporated.

As shown in FIG. 3, the multilayer winding 35Ua of the stator 31 assembled as described above is positioned on the upper side in the drawing, and the multilayer winding 35Ub is positioned on the lower side. Hereinafter, similarly, the multilayer windings 35Va, 35Vb, 35Wa, and 35Wb are positioned as shown.

Next, the center of the magnet 38a, which is the first magnet of the rotor 36, is wound around the magnetic pole teeth 3 on which the multilayer winding 35Ua is wound.
The center of the magnet 38c, which is the third magnet, is positioned at the center of the magnetic pole tooth 33d around which the multilayer winding 35Ub is wound.

Similarly, the center of the magnet 38b, which is the second magnet, is positioned at the center between the magnetic pole teeth 33b wound with the multilayer winding 35Va and the magnetic pole teeth 33c wound with the multilayer winding 35Wa, that is, at the end. Are aligned with the center of the magnetic pole teeth 33b around which the multilayer winding 35Va is wound and the center of the magnetic pole teeth 33c around which the multilayer winding 35Wa is wound.

The center of the magnet 38d is connected to a multilayer winding 35V.
b is wound between the magnetic pole teeth 33e and the magnetic pole teeth 33f around which the multilayer winding 35Wb is wound, that is, the end is a multilayer winding 35V.
b and the central part of the magnetic pole teeth 33e and the multilayer winding 35Wb
Is aligned with the center of the magnetic pole teeth 33f wound.

Thus, the multilayer winding 34 of the stator 31
Ua, 34Ub, etc., that is, the positions of the magnetic pole teeth 33a, 33d, etc. and the unmagnetized magnets 38a, 38c of the rotor 36, etc. are specified.

When such preliminary preparations are completed, the multilayer windings 35Ua, 35Ub, 35Va, 35Vb, 35Wa, 35Wb are
DC current from the DC power supply 39 as shown in FIG.
I0 is passed through the multilayer windings 35Ua and 35Ub, divided into 1 / 2I0, and then passed through the multilayer windings 35Va, 35Vb, 35Wa and 35Wb to perform the first magnetizing process.

In this way, as shown in FIG. 3, a uniform magnetic flux and a large magnetic flux Φ1 are generated at the center of the multilayer windings 35Ua and 35Ub of the compressor motor 30, so that the multilayer winding 3
At the center of 5Va, 35Vb, 35Wa, 35Wb, the magnetic flux is uniform and generates a relatively small magnetic flux Φ2.

As shown in FIG. 3, the unmagnetized magnets 38a and 38c arranged at predetermined positions with the large magnetic flux Φ1 are magnetized with a uniform magnetizing amount M0, and similarly with the small magnetic flux Φ2. The magnets 38b and 38d are magnetized in a state where they are equal but the amount of magnetization is small.

When the first magnetizing process is completed, the rotor 36
Is rotated clockwise by 90 ° as shown in FIG.
The center of d is the center of the magnetic pole teeth 33a, and the center of the magnet 38b
Is aligned with the center of the magnetic pole teeth 33d.

Similarly, the central portion of the magnet 38a is
b, 33c, the ends of which are the magnetic pole teeth 33b, 3c.
The center of the magnet 3d and the center of the magnet 38d are the magnetic pole teeth 33.
e, 33f, the middle part, that is, the ends are the magnetic pole teeth 33e, 3f.
3f is aligned with the center.

Thus, the multilayer winding 34 of the stator 31
Ua, 34Ub, etc., that is, the positions of the magnetic pole teeth 33a, 33d, etc. and the unmagnetized magnets 38a, 38c, etc. of the rotor 36 are rotated 90 ° from the position shown in FIG. 3, ie, electrically reversed. To the location.

Next, the three-phase multilayer windings 35Ua, 35Ub,
2 are connected in a three-phase manner as shown in FIG. 4, and a DC current I0 is supplied from a DC power supply 39.
The current is divided into 1 / 2I0 and the multilayer windings 35Va, 35Vb, 35Wa,
35Wb, and then collectively, multilayer windings 35Ua, 35U
Pour Ub and perform the second magnetization process.

In this way, as shown in FIG. 5, the multilayer windings 35Ua and 35Ub of the compressor motor 30 have the same and opposite magnetic flux Φ11 as that shown in FIG.
Similarly, the opposite and uniform and small magnetic flux Φ22 is generated in the multilayer windings 35Va, 35Vb, 35Wa and 35Wb.

The almost unmagnetized magnets 38d and 38b arranged at predetermined positions by this large magnetic flux Φ11 are magnetized with a uniform magnetizing amount M0 as shown in FIG. 5, and the second magnetizing process is performed. I do.

At this time, similarly, the unmagnetized magnets 38a and 38c are magnetized by the small magnetic flux Φ22. There is no.

Each of the magnets 38a, 38a is
b, 38c and 38d are equal as shown in FIG.
Magnetization occurs with a large magnetization amount M0.

Therefore, the present invention provides a multi-layer winding of the stator with three windings.
Phase connection, the position of the multilayer winding and the position of the rotor magnet are magnetized with a fixed relationship, so the non-magnetized magnets are magnetized evenly and with a large amount of magnetization, resulting in quality. And a compressor motor excellent in the above can be obtained.

In the above embodiment, the stator having six magnetic pole teeth and the rotor having four poles has been described. However, the stator has 3n magnetic pole teeth (n is a positive number of 2 or more) and the rotor has 2 m ( m is 2
It can be applied to those having the above (positive number) poles.

In this case, the rotor must be rotated by 180 ° / m during the second magnetizing process.

Although the multilayer windings 35Ua, 35Ub, etc. are connected in series, they may be connected in parallel.

[0046]

According to the invention of each claim, 3n (n is a positive number of 2 or more) magnetic pole teeth are formed on a stator, and a multi-layer winding wound around the magnetic pole teeth is connected in three phases. In a method of magnetizing a compressor motor in which 2 m (m is a positive number of 2 or more) non-magnetized magnets provided on a rotor by winding are magnetized, the first magnetizing process uses one magnet. The center is positioned at the center of a predetermined magnetic pole tooth, and a magnetizing current is applied to perform magnetizing processing. For the next magnetizing processing, the rotor is rotated by 180 ° / m, and the polarity of the current is reversed in the first direction. Since the non-magnetized magnet is magnetized by flowing the magnetic current, the unmagnetized magnet provided in the rotor can be magnetized uniformly and with a large magnetizing amount.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an outline of a method of magnetizing a compressor motor according to the present invention.

FIG. 2 is an explanatory diagram showing a connection example of multilayer windings when magnetizing the compressor motor of the present invention.

FIG. 3 is an explanatory diagram showing a first example of a magnetizing process of the electric motor for a compressor of the present invention.

FIG. 4 is an explanatory diagram showing another connection example of the multilayer winding at the time of magnetization of the compressor motor of the present invention.

FIG. 5 is an explanatory view showing a second example of the magnetizing process of the electric motor for a compressor of the present invention.

FIG. 6 is an explanatory view showing an example of magnetization of a commonly used magnet.

FIG. 7 is an explanatory diagram showing a connection example of a generally used multilayer winding.

FIG. 8 is an explanatory diagram showing a magnetization characteristic curve according to FIG. 6;

FIG. 9 is an explanatory view showing another example of magnetization of a commonly used magnet.

FIG. 10 is an explanatory view showing an example of the magnetizing action of FIG. 9;

FIG. 11 is an explanatory diagram showing a magnetization characteristic curve according to FIG. 10;

FIG. 12 is an explanatory view showing an example of a magnetizing action according to FIG. 10;

FIG. 13 is an explanatory diagram showing another connection example of a generally used multilayer winding.

FIG. 14 is an explanatory view showing another example of the magnetizing action of a commonly used magnet.

[Explanation of symbols]

10, 30 Compressor motor 11, 22, 32 Slot 12, 31 Stator 24Ua, 24Va, 24Wa, 35Ua, 35Va, 35Wa ...
Multi-layer windings 14, 26, 38a, 38b, 38c, 38d ... Magnets 15, 25, 36 Rotors 17, 28, 39 DC power supplies 23, 33a, 33b, 33c, 33d, 33e, 33f Magnetic pole teeth

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kiyotaka Kawamura 336 Tatehara, Fuji City, Shizuoka Prefecture F-term in Toshiba Fuji Plant (reference) 5H621 AA03 GA01 GA04 GA16 HH01 JK02 5H622 AA03 CA02 CA05 CA13 CB04 CB05 PP03 PP10 PP11 QB01 QB10

Claims (4)

[Claims] 1. A stator having 3n (n is a positive number of 2 or more) magnetic pole teeth formed on a stator, and a multi-layer winding wound around the magnetic pole teeth connected in three phases. 2m pieces (m is 2
In the method of magnetizing the compressor motor for magnetizing the unmagnetized magnet of the above (positive number), in the first magnetizing process, the center of one magnet is positioned at the center of the predetermined magnetic pole teeth, and The magnetizing process is performed by flowing a magnetizing current. In the next magnetizing process, the rotor is rotated by 180 ° / m, and the magnetizing current is caused to flow in the direction opposite to the polarity of the current to magnetize the unmagnetized magnet. A method for magnetizing a motor for a compressor, characterized in that: 2. The mounting of the compressor motor according to claim 1, wherein the stator has six magnetic pole teeth, and the rotor has four unmagnetized magnets. Magnetic method. 3. The compression according to claim 1, wherein the center of one magnet is located at the center of the magnetic pole teeth, and the end of the other magnet is located at the center of the magnetic pole teeth. Method of magnetizing electric motor for machine. 4. The method according to claim 1, wherein each magnet is formed in an arc shape.