JP2001327133A - Capacitor induction motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a capacitor induction motor which can be manufactured with reduced man-hours, employs a concentrated winding to obtain a large short-pitch winding factor and has an improved motor efficiency. SOLUTION: This capacitor induction motor has a rotor 6 and a stator 10 provided outside the rotor 6. The stator 10 comprises a yoke 10a on the outer circumference side and five teeth 10b which are made to protrude from the yoke 10a toward the center and arranged circumferentially with the same intervals so as to have a 5-slot structure. Two teeth 10b with two slots between them are electrically insulated and main windings 11a and 11b are applied to the two teeth 10b as concentrated windings. A tooth 10b between the two main windings 11a and 11b and a tooth 10b adjacent to the one main winding 11b are electrically insulated and auxiliary windings are applied to the teeth 10b as concentrated windings. The windings are connected to each other so as to make the two main windings 11a and 11b apart from each other by a mechanical angle of 144 degrees and have the same polarities and make the two auxiliary windings 12a and 12b apart from each other by a mechanical angle of 144 degrees and have the same polarities.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner rotor type capacitor induction motor for use in an air conditioner or the like, and more particularly, to improving efficiency of a motor by devising a four-pole stator and windings. The present invention relates to a capacitor induction motor as described above.

[0002]

2. Description of the Related Art In general, a capacitor induction motor has a rotor disposed inside a stator having 16 slots (grooves) or 24 slots, and a four-pole distributed winding is provided through a predetermined number of slots. In this distributed winding, the number of slots is large, and the winding is applied over a plurality of slots, so that the number of steps such as coil winding, coil inserter, shaping, insulation, and lacing is large. For this reason, the production cost is increased,
As a result, there is a disadvantage that the processing cost is increased.

Therefore, as shown in FIGS. 4 and 5, 8
There is a method of applying concentrated winding to the teeth of the stator 1 of the slot. The windings of this capacitor induction motor are connected by main windings 2a, 2b, 2c, 2d and auxiliary windings 3a, 3b, 3c, 3d separated by 90 degrees in mechanical angle.
The phase-advancing capacitor 4 is inserted in series with a, 3b, 3c, and 3d.

[0004] When an AC power supply 5 is applied to the above-described parallel-connected circuit, a rotating magnetic field is generated in the stator 1, and a torque acts on the rotor 6 inside the stator 1 to rotate the rotor 6. In FIGS. 4 and 5, a1 to a8 denote each main winding 2
a, 2b, 2c, 2d, and b1 to b8 are terminals of the auxiliary windings 3a, 3b, 3c, 3d.

As described above, the concentrated winding main windings 2a, 2b, 2c, 2d and auxiliary windings 3a, 3
Since b, 3c, and 3d may be wound alternately, not only the number of slots can be reduced as compared with the distributed winding, but also the number of steps can be reduced, so that there is an advantage that the processing cost can be reduced.

[0006]

In the above-mentioned capacitor induction motor, since the number of struts is eight, the short-coil winding factor of concentrated winding is as small as sin 45 °, and this short-coil winding factor is small. Then, there is a problem that the torque constant becomes small and the motor efficiency becomes low.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to form a 4-pole stator with a small number of slots and increase the short-coil winding coefficient of its winding to increase motor efficiency. Another object of the present invention is to provide a capacitor induction motor capable of reducing the cost by reducing the amount of copper wire used.

[0008]

In order to achieve the above object, a capacitor induction motor according to the present invention comprises a stator disposed outside a rotor and having a yoke portion on an outer peripheral side and a center protruding from the yoke portion. The stator has a five-slot configuration composed of five teeth at equal intervals in the circumferential direction. The two teeth of the stator at two slots are electrically insulated, and the main winding is formed by concentrated winding. Auxiliary winding is provided by concentrated winding by electrically insulating the teeth between the two main windings and the adjacent tooth of one main winding, and the two main windings have the same polarity at a mechanical angle of 144 degrees. The two auxiliary windings have the same polarity at a mechanical angle of 144 degrees apart.

The connection of the windings includes connecting the auxiliary winding and the capacitor in series, connecting the series circuit and the main winding in parallel, and supplying AC power to the parallel circuit. Good. The connection of the windings connects the main winding and the capacitor in parallel, connects the parallel circuit and the auxiliary winding in series, and connects the main winding and the auxiliary winding to the capacitor. It is preferable to supply AC power to the series circuit. Thereby, an appropriate rotating magnetic field is generated as a capacitor induction motor.

[0010] The electrical insulation may be a PET film. Since the PET film is inexpensive, not only can the cost of the motor be reduced, but also the primary leakage magnetic flux can be reduced, so that the torque can be improved.

The above electrical insulation is made of PET, PBT, PPS
It is preferable to insert a thermoplastic resin into the stator or to form a preformed bobbin on the stator. In particular, in the case of a bobbin made of a thermoplastic resin, after the concentrated winding is applied to the bobbin, the bobbin can be easily mounted on the stator, so that not only the manufacturing process can be simplified, but also the processing cost can be reduced. it can.

The main winding and the auxiliary winding are preferably a polyester copper wire or a polyester copper wire coated with polyamide. In particular, in the case of a polyester copper wire overcoated with a polyamide, the above-described electrical insulation can be omitted, so that the cost can be reduced.

[0013]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described in detail with reference to FIG. In FIGS. 1 to 3, A1 to A4 are terminals of the main windings 11a and 11b, and B1 to B4 are terminals of the auxiliary windings 12a and 12b.

In FIG. 1, a stator 10 of a capacitor induction motor according to the present invention is provided with five teeth 10b protruding from a yoke portion 10a at the center at equal intervals in the circumferential direction. The main windings 11a and 11b of the concentrated winding are applied while being insulated, and the main windings 11a and 11b are
The auxiliary windings 12a and 12b of concentrated winding are insulated from the teeth 10b between the main winding 11b and the teeth 10b adjacent to the main winding 11b.
In such a manner that no winding is applied to the remaining one tooth 10b.

As shown in FIG. 2, the main windings 11a, 11b
And the auxiliary windings 12a and 12b are connected in series, respectively, while the capacitor 13 is connected in series to the auxiliary windings 12a and 12b, and this circuit and the main windings 11a and 11b are connected in series. An AC power supply 5 is applied to both ends of 11a and 11b. The winding directions of the main windings 4a and 4b and the auxiliary windings 5a and 5b are the same.

As described above, the main windings 11a and 11b and the auxiliary windings 12a and 12b are concentrated windings based on the consequent pole method, and two main windings 11a and 11b separated by a mechanical angle of 144 degrees. The teeth 10b have the same polarity. In addition, the auxiliary windings 12a and 12b make the mechanical angle 1
The two teeth 10b separated by 44 degrees have the same polarity and form four poles on the stator 10. In addition, inside the stator 10,
For example, a rotor 6 having a cage structure is arranged. No winding is applied to the teeth 10b between the main winding 11a and the auxiliary winding 12b. Further, the width of the yoke portion 10a is
It is good to make it 1/2 or more of the tooth width.

According to the stator 10 having the above configuration, the main winding 1
The magnetic poles by 1a and 11b are the same. For example, if the magnetic field by the main winding 11a is N pole, the magnetic field by the main winding 11b is also N pole. The magnetic flux generated by the main winding 11a is distributed via the teeth 10b having no adjacent winding and the teeth 10b of the auxiliary winding 12a and the yoke portion 10a.
The magnetic pole of the tooth 10b adjacent to 1a, especially the tooth 10b having no winding is an S-pole (see the broken line in FIG. 1).

As described above, the auxiliary windings 12a, 12a
b is the same, for example, its auxiliary winding 12
If the magnetic field by a is an N pole, the magnetic field by the auxiliary winding 12b is also an N pole. The magnetic flux generated by the auxiliary winding 12b is distributed in the same manner as the magnetic flux of the main winding 11a.
0b, in particular, the magnetic pole of the tooth 10b having no winding is an S pole. Further, the magnetic pole of the tooth 10b without the winding is connected to the main winding 11
The magnetic poles are reversed in different sections of the magnetic poles a and 11b and the magnetic poles of the auxiliary windings 12a and 12b.

Therefore, the main windings 11a and 11b and the auxiliary windings 12a and 12b are driven by the AC current of the AC power supply 5.
b, the magnetic pole of the tooth 10b also changes. As a result, a rotating magnetic field is generated in the stator 10. Also,
The short winding factor of each of the main windings 11a and 11b and the auxiliary windings 12a and 12b is sin72 °.

As described above, the number of teeth 10b of the stator 10 is as small as five, and even if the winding is not applied to all the teeth 10b,
Not only can four poles be formed, but also the number of concentrated windings (coils) can be reduced, so that manufacturing costs can be reduced. Also, the main windings 11a, 11b
In addition, since the auxiliary windings 12a and 12b are concentrated windings, the processing cost can be reduced as compared with the distributed winding.
Further, since the short-turn winding coefficient is larger than that of the related art, that is, the effective number of turns (= the number of turns × the short-turn winding coefficient) increases, the torque increases and the motor efficiency can be improved. In addition, since the amount of copper wire used can be reduced, the cost can be reduced.

Incidentally, the connection in the above embodiment (see FIG. 2)
Has described the case where the serial system is adopted, but the same effect can be obviously obtained by applying the parallel system as shown in FIG.

In this parallel system, the main winding 14 and the capacitor 15 are connected in parallel, and the parallel circuit and the auxiliary winding 16 are connected in series. The AC power supply 5 may be supplied to the series circuit with the AC power supply 15. The main winding 14 corresponds to the main windings 11a and 11b shown in FIG. 2, and the auxiliary winding 16 corresponds to the auxiliary windings 12a and 12b shown in FIG.

In the above embodiment, the main winding 11
a, 11b and the auxiliary windings 12a, 12b are applied to the teeth 10b via an electrical insulating member. As the windings, a polyester copper wire or a polyester copper wire overcoated with polyamide may be used. As a result, the electric insulating member can be omitted, and the processing cost can be reduced.

An inexpensive PET film is used as the electric insulating member, and the PET film is mounted on the stator 10 to insulate the slots. Since this PET film is excellent in shrinkage, primary leakage magnetic flux can be reduced.

The electric insulating member is made of PE
Using a thermoplastic resin such as T, PBT, PPS, etc., the thermoplastic resin is insert-molded on the stator 10 to insulate the slots. Furthermore, PE is used as the electric insulating member.
A bobbin of a predetermined shape is formed using a thermoplastic resin such as T, PBT, PPS, etc., and the bobbin is mounted on the stator 10 to insulate the slot. As a result, in manufacturing,
After applying the concentrated winding to the bobbin, it is only necessary to mount the bobbin on the stator 10, so that the manufacturing process can be simplified and the processing cost can be reduced.

[0026]

According to the present invention described above, the following effects can be obtained. The present invention relates to an inner rotor type capacitor induction motor, in which a stator having a five-slot configuration is provided with a yoke part on the outer peripheral side and five teeth projecting from the yoke center and equally spaced in a circumferential direction. The two windings of the stator are electrically insulated from the two teeth placed in two slots, and the main winding is formed by concentrated winding, and the teeth between the two main windings and the adjacent tooth of one main winding are provided. Auxiliary winding is provided by concentrated winding with electrical insulation, and the two main windings are
Since the two auxiliary windings are of the same polarity at a mechanical angle of 144 degrees apart from each other at 44 degrees and have the same polarity at a mechanical angle of 144 degrees, the number of coils is reduced because there are teeth on the four-pole stator where no winding is applied. Therefore, the number of processing steps and the like can be reduced, and the manufacturing cost can be reduced. Further, since the short winding coefficient of each of the main winding and the auxiliary winding, which are concentratedly wound at a lower processing cost than the distributed winding, is as large as sin 72 °, the torque is increased and the motor efficiency can be increased. In addition, there is an effect that the cost can be reduced by reducing the amount of copper wire used.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a capacitor induction motor illustrating an embodiment of the present invention.

FIG. 2 is a schematic connection diagram for explaining winding connection of a stator of the capacitor induction motor shown in FIG.

FIG. 3 is a schematic connection diagram of a capacitor induction motor for explaining another example of the winding connection of the present invention.

FIG. 4 is a schematic plan view illustrating a conventional capacitor induction motor.

FIG. 5 is a schematic connection diagram for explaining winding connection of a stator of the capacitor induction motor shown in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Stator 10a Yoke part 10b Teeth 11a, 11b, 14 Main winding 12a, 12b, 16 Auxiliary winding 5 AC power supply 6 Rotor 13, 15 Capacitor

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Summit Loudon Sac 1116, Suenaga, Takatsu-ku, Kawasaki, Kanagawa Prefecture Inside Fujitsu General Co., Ltd. (72) Inventor Thaler Guson Chatton 1116, Suenaga, Takatsu-ku, Kawasaki, Kanagawa Prefecture Stock Company Within Fujitsu General (72) Inventor Akihiro Ito 1116, Suenaga, Takatsu-ku, Kawasaki, Kanagawa Prefecture Inside Fujitsu General Co., Ltd. (72) Takashi Suzuki 1116, Suenaga, Takatsu-ku, Kawasaki City, Kanagawa Prefecture Incorporated Fujitsu General Co., Ltd. (72) Inventor Hiroyuki Okudera 1116, Suenaga, Takatsu-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Fujitsu General Limited (72) Inventor Yuji Soma 1116, Suenaga, Takatsu-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Fujitsu General Limited (72) Inventor Yuji Kawai, Takatsu-ku, Kawasaki, Kanagawa Prefecture 1116 Suencho Stock Association Inside Fujitsu General Co., Ltd. (72) Inventor Hidetaka Terakubo 1116, Suenaga, Takatsu-ku, Kawasaki-shi, Kanagawa Prefecture F-term in Fujitsu General Co., Ltd. FA02 FA15 FA27 FA29 5H604 AA08 BB01 BB09 BB14 CC01 CC05 CC16 DA16 DA17 DA20 PB01 PB03

Claims (7)

[Claims] 1. A stator arranged outside a rotor has a five-slot configuration including a yoke part on an outer peripheral side and five teeth projecting from the yoke part to the center and equally spaced in a circumferential direction. The two windings of the stator are electrically insulated from the two teeth and the main winding is formed by concentrated winding, and the teeth between the two main windings and the adjacent tooth of one main winding are electrically connected. Insulating and auxiliary windings are provided by concentrated winding, the two main windings have the same polarity at a mechanical angle of 144 degrees, and the two auxiliary windings have the same polarity at a mechanical angle of 144 degrees. A capacitor induction motor. 2. The circuit according to claim 1, wherein the auxiliary winding and the capacitor are connected in series, the series circuit and the main winding are connected in parallel, and AC power is supplied to the parallel circuit. 2. The capacitor induction motor according to 1. 3. A series circuit of the main winding, the auxiliary winding, and the capacitor, wherein the main winding and the capacitor are connected in parallel, and the parallel circuit and the auxiliary winding are connected in series. 2. The capacitor induction motor according to claim 1, wherein AC power is supplied to the motor. 4. The capacitor induction motor according to claim 1, wherein the electrical insulation is a PET film. 5. The electrical insulation is made of PET, PBT, PP.
The capacitor induction motor according to claim 1, wherein the stator is insert-molded with a thermoplastic resin containing S. 6. The electrical insulation is made of PET, PBT, PP.
2. The capacitor induction motor according to claim 1, wherein the bobbin is formed of a thermoplastic resin containing S and mounted on the stator. 7. The capacitor induction motor according to claim 1, wherein the main winding and the auxiliary winding are a polyester copper wire or a polyester copper wire coated with polyamide.