JP2001327134A - 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: The stator 10 of this capacitor induction motor comprises a yoke 10b on the outer circumference side and seven teeth 10a and 10aa which are made to protrude from the yoke 10b toward the center and arranged in a circumference direction so as to have a 7-slot structure. Among the seven teeth, one tooth 10aa, the teeth 10a adjacent to the tooth 10aa and two teeth 10a every two slots apart from the adjacent tooth 10a are electrically insulated respectively and concentrated main windings 11a, 11b, 11c and 11d are applied to the respective four teeth. The tooth 10a adjacent to the main winding 11a, the tooth 10aa of the main winding 11a and two teeth 10a every two slots apart from the tooth 10aa of the main winding 11a are electrically insulated respectively and concentrated auxiliary windings 12a, 12b, 12c and 12d are applied to the respective four teeth. One main winding 11a and one auxiliary winding 12b are applied to one tooth 10aa in common, the windings which face approximately each other have the same polarities and the windings adjacent to them have reverse 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 used for an air conditioner or the like, and more particularly, to improving the motor efficiency 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, which results in an increase in manufacturing costs. Further, there is a disadvantage that the processing cost is increased.

Therefore, as shown in FIG. 3 and FIG.
There is a method in which concentrated winding is applied to each tooth of the stator 1 of the slot. The windings of this capacitor induction motor are connected with auxiliary windings 3a, 3b, 3c, 3d at a mechanical angle of 90 degrees from the main windings 2a, 2b, 2c, 2d.
A phase-advancing capacitor 4 is inserted in series with 3b, 3c and 3d. 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 is generated in the rotor 6 inside the stator 1 to generate a rotating force.

[0004] Incidentally, the reference numerals in FIG. 3 and FIG.
a1 to a8 are terminals of the main windings 2a, 2b, 2c, 2d, and b1 to a8 are terminals of the auxiliary windings 3a, 3b, 3
Terminals c and 3d. As described above, since the concentrated winding main windings 2a, 2b, 2c, 2d and the auxiliary windings 3a, 3b, 3c, 3d may be wound around the teeth of the stator 1, the number of slots is larger than that of the distributed winding. Not only can the number of steps be reduced, but also the number of steps can be reduced, so that there is an advantage that the processing cost can be reduced.

[0005]

However, in the above-described capacitor induction motor, the number of struts is eight, so that the short-coil winding factor of concentrated winding is as small as sin45 °. If the short-coil winding coefficient is small, the torque constant becomes small. If the amount of copper wire used is not increased, the desired efficiency cannot be obtained, and the motor efficiency will be reduced.

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 to increase the motor efficiency by increasing the short winding factor of its winding. 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.

[0007]

In order to achieve the above object, a capacitor induction motor according to the present invention comprises a stator arranged outside a rotor, which protrudes centrally from a yoke portion on the outer peripheral side and from the yoke portion. In addition, a seven-slot structure is formed from seven teeth provided in the circumferential direction, and one tooth among the seven teeth, a tooth next to the tooth, and two teeth every two slots from the next tooth are arranged. Are electrically insulated to form four concentrated winding main windings, and the teeth next to the main winding, the teeth of the main winding and two teeth every two slots from the same tooth are respectively provided. Four auxiliary windings of concentrated winding are formed by electrical insulation, and the one main winding and the auxiliary winding are applied to one common tooth, and the same as the main winding of the common tooth. The polarity of the magnetic pole of the main winding of the tooth next to the main winding is reversed, and the same as the main winding of the tooth next to this shared tooth. The magnetic pole of the main winding of the tooth two slots away from the winding has the opposite polarity, and the magnetic pole of the main winding of the tooth two slots away from the same main winding has the opposite polarity. The magnetic poles of the auxiliary winding of the tooth adjacent to the common tooth and the auxiliary winding of the same tooth are made to have opposite polarities, and the auxiliary winding of the common tooth and the auxiliary tooth of the tooth two slots from the auxiliary winding are set. And the magnetic poles of the auxiliary windings of the teeth placed two slots apart from each other and the auxiliary main windings of the teeth placed two slots away from the auxiliary windings have the opposite polarity.

[0008] The tooth width and the magnetic pole pitch angle of the common tooth for applying the one main winding and the auxiliary winding are made larger than the remaining teeth, or the common tooth for applying the one main winding and the auxiliary winding is used. The tooth width and the magnetic pole pitch angle of each tooth may be the same as those of the remaining teeth. Thus, for example, the short winding factor of the main winding and the auxiliary winding of the common tooth becomes larger than sin51 °, and the short winding factor of the main winding and the auxiliary winding of the remaining tooth becomes s.
larger than in45 ° (sin51 ° or less).

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 connecting an AC power supply to the parallel circuit. Good to supply. The connection of the windings includes connecting the main winding and the capacitor in parallel, and connecting the parallel circuit and the auxiliary winding in series, the main winding and the auxiliary winding and the capacitor. AC power may be supplied to the series circuit of 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 and the torque can be improved.

The above electrical insulation is made of PET, PBT, PPS
It is good that it is a thermoplastic resin containing. The above electrical insulation is P
A bobbin formed using a thermoplastic resin containing ET, PBT, and PPS is preferable. In particular, in the case of a bobbin made of a thermoplastic resin, it is only necessary to attach the bobbin to the stator after applying the concentrated winding to the bobbin, so that the bobbin is excellent in easiness of production and the processing cost can be reduced.

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 polyamide, the above-described electrical insulation can be omitted, and 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. 1 and 2, A1 to A4 are the main windings 11.
a, 11b, 11c, and 11d, and B1 through B4 are terminals of the auxiliary windings 12a, 12b, 12c, and 12d.

In FIG. 1, the stator 10 of the capacitor induction motor of the present invention has six teeth 10a and one 10aa.
And each tooth 10a, 10a
The teeth 10a, 10aa are protruded from the yoke portion 10b to the center and provided in the circumferential direction so that the short winding factor of the concentrated winding applied to a is larger than sin45 °.

As shown in FIGS. 1 and 2, one tooth 1
0aa, a tooth 10a adjacent to the tooth 10aa and two teeth 10a every two slots from the tooth 10a adjacent to the tooth 10aa are electrically insulated so that the main windings 11a, 11b,
Four 11c and 11d are formed. Similarly, the main winding 1
The tooth next to 1a (the tooth on the left side on the paper) 10a, the main winding 11a
The teeth 10aa and the two teeth 10a at every two slots from the tooth 10aa are electrically insulated to form four concentrated winding auxiliary windings 12a, 12b, 12c, and 12d.

Accordingly, one tooth 10aa is provided with both the main winding 11a and the auxiliary winding 12b, and the tooth 10a adjacent to the one tooth 10aa is provided with the auxiliary winding 12a and the main winding 11b. Is applied. The tooth width of the tooth 10aa on which the main winding 11a and the auxiliary winding 12b are applied is made larger than the tooth width of the tooth 10a by applying another winding. The width of the yoke portion 10b is determined in consideration of the width of the teeth 10a, 10aa.

The tooth width of the other teeth 10a is the same, the center angle of the arc of the other teeth 10a is 51 degrees or less (the so-called magnetic pole pitch angle is 51 degrees or less), and the short winding factor is sin51 °. On the other hand, the central angle of the arc of the tooth of 10ba, which is shared by the main winding 11a and the auxiliary winding 12b, is 5
It is made larger than 1 degree (the so-called magnetic pole pitch angle is made larger than 51 degrees), and its short-pitch winding coefficient is made larger than sin 51 degrees.

The main windings 11a, 11b, 11c,
11d and auxiliary windings 12a, 12b, 12c, 12d
Are connected in series as shown in FIGS. 1 and 2, while the capacitor 13 is connected to the auxiliary windings 12a, 12b, 12
The circuit is connected in series with the main windings 11a, 11b, 11c and 11d, and the AC power supply 5 is applied to both ends of the main windings 11a, 11b, 11c and 11d. The main windings 11a and 11c and the main windings 11b and 11d are reversely wound, and the auxiliary windings 12a and 12d are reversed.
c and the auxiliary windings 12b and 12d are reversely wound.

Therefore, the teeth 10aa of the main winding 11a and the teeth 10a of the main winding 11c which are substantially opposite to each other have the same polarity, and the teeth 10a of the main winding 11b and the teeth 10a of the main winding 11a also have the same polarity.
Have the same polarity, and they have the opposite polarity. Similarly, the teeth 10a of the auxiliary winding 12a and the teeth 1 of the auxiliary winding 12c
0a has the same polarity, teeth 10aa of auxiliary winding 12b and 10a of auxiliary winding 12d have the same polarity, and they have the opposite polarity. The rotor 6 having, for example, a cage structure is disposed inside the stator 10.

According to the stator 10 constituting the four poles,
For example, if the magnetic field from the main windings 11a and 11c is N-pole, the magnetic field from the main windings 11b and 11d is S-pole. If the magnetic field from the auxiliary windings 12a and 12c is N-pole, the magnetic field from the auxiliary windings 12b and 12d is S-pole.

The teeth 10a on which the main winding 11a and the auxiliary winding 12b are provided have opposite polarities, depending on the application state of the AC power supply 5 (that is, the AC current phase state). It has the same polarity, and it is possible to generate magnetic poles of both the main winding and the auxiliary winding. Accordingly, the two windings substantially facing each other have the same polarity and their magnetic poles change due to the AC current of the AC power supply 5. As a result, a rotating magnetic field is generated in the stator 10.

The short-coil winding coefficients of the main windings 11b, 11c, 11d and the auxiliary windings 12a, 12c, 12d are larger than sin 45 ° and smaller than sin 51 °, respectively. The short turn factor is greater than sin 51 °.

As described above, the main windings 11a, 11b, 11
c, 11d and auxiliary windings 12a, 12b, 12c, 1
Since 2d is a concentrated winding, the processing cost is lower than that of the distributed winding. Also, as compared with the stator 1 shown in FIG.
Since the number of teeth 10b of the stator 10 is as small as seven, the short-section winding coefficient of the winding is much larger than sin 45 °, that is, the effective number of turns (= number of turns × the short-section winding coefficient) is large. In addition, the motor efficiency can be improved, and the cost can be reduced by reducing the amount of copper wire used.

By the way, the connection in the above embodiment is described in connection with the case where the serial system is adopted. However, even if the parallel system is applied, obviously the same effect can be obtained. This parallel system uses the main windings 11a, 11b, 11c, 11d.
Are connected in parallel to the main winding and the capacitor, and the parallel circuit and the auxiliary windings 12a and 12a are connected in parallel.
An AC power supply 5 may be supplied to a series circuit of the main winding, the auxiliary winding, and the capacitor by connecting in series an auxiliary winding in which b, 12c, and 12d are connected in series.

In the embodiment described above, the main winding 11
a, 11b, 11c, 11d and auxiliary windings 12a, 1
2b, 12c and 12d are connected to the teeth 10a via an electrically insulating member.
It is preferable to use a polyester copper wire or a polyester copper wire overcoated with polyamide as the winding. Thereby, it is possible to omit the electric insulating member, and it is possible to reduce the processing cost.

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. This PET film is excellent in shrinkage and can reduce primary leakage magnetic flux. As the electric insulating member, a thermoplastic resin such as PET, PBT, PPS or the like is used, and the thermoplastic resin is insert-formed to insulate the slot.

As the above-mentioned electric insulating member, PET, PB
A bobbin having a predetermined shape is formed using a thermoplastic resin such as T or PPS, and the bobbin is mounted on the stator 10 to insulate the slot. Thus, it is only necessary to attach the bobbin to the stator 10 after applying the concentrated winding to the bobbin, so that the manufacturing process can be simplified and the processing cost can be reduced.

In the embodiment described above, the main winding 11a
The tooth width of the common tooth 10aa to which the auxiliary winding 12b is applied is larger than the tooth width of the other teeth 10a, but the tooth widths of all the teeth are the same, and the short winding factor of each tooth is substantially sin.
(360/7) °. In this case, the cost can be reduced by reducing the amount of copper wire used.

[0029]

According to the present invention described above, the following effects can be obtained. The stator of the capacitor induction motor of the present invention has a configuration of 7 slots, and one of the seven teeth, the tooth next to the tooth and two teeth every two slots from the tooth next to the tooth are respectively provided. Four main windings of concentrated winding are formed by applying electrical insulation, and the tooth next to one main winding, the tooth of this main winding and two teeth every two slots from the same tooth are respectively provided. Four auxiliary windings of concentrated winding are formed by applying electrical insulation, and the above-mentioned one main winding and one auxiliary winding are applied to one common tooth. Since the windings have opposite polarities, the short-coil winding factor of the concentrated winding main winding and the auxiliary winding can be increased at a lower processing cost than that of the distributed winding. Therefore, the torque constant can be increased, the efficiency of the motor can be improved, and 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 plan view illustrating a conventional capacitor induction motor.

FIG. 4 is a schematic connection diagram for explaining winding connection of a stator of the capacitor induction motor shown in FIG. 3;

[Explanation of symbols]

 Reference Signs List 5 AC power supply 6 Rotor 10 Stator 10a, 10aa Teeth 10b Yoke part 11a, 11b, 11c, 11d Main winding 12a, 12b, 12c, 12d Auxiliary winding 13 Capacitor

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02K 3/46 H02K 3/46 B (72) Inventor Wepon Pompanijarune 1116, Suenaga, Takatsu-ku, Kawasaki City, Kanagawa Prefecture No. 1 Fujitsu General Co., Ltd. (72) Inventor Thaler Guson Chatton 1116, Suenaga, Takatsu-ku, Kawasaki, Kanagawa Prefecture Incorporated Fujitsu General Co., Ltd. (72) Hidetaka Terakubo 1116, Suenaga, Takatsu-ku, Kawasaki, Kanagawa Fujitsu, Ltd. In General (72) Inventor Takashi Suzuki 1116 Suenaga, Takatsu-ku, Kawasaki, Kanagawa Prefecture Inside Fujitsu General Co., Ltd. (72) Inventor Hiroyuki Okudera 1116, Suenaga, Takatsu-ku, Kawasaki City, Kanagawa Prefecture Intranet Fujitsu General Co., Ltd. (72) Inventor Soma Yuji 1116 Suenaga, Takatsu-ku, Kawasaki City, Kanagawa Prefecture Fujitsu General Co., Ltd. (72) Inventor Yuji Kawai 1116, Suenaga, Takatsu-ku, Kawasaki City, Kanagawa Prefecture Incorporated Fujitsu General Co., Ltd. (72) Akihiro Ito 1116, Suganaga, Takatsu-ku, Kawasaki City, Kanagawa Prefecture F-term in Futtsu General Co., Ltd. Reference) 5H002 AA06 AA09 AE07 5H013 DD01 DD03 LL00 LL05 5H603 AA00 AA01 BB01 BB06 BB08 BB12 CA01 CA04 CB01 CB22 CB26 CC11 CC17 CD21 CE01 CE13 FA01 FA22 FA26 FA27 FA29 5H604 AA08 BB01 DB03 CC19 DA14

Claims (7)

[Claims] 1. A stator arranged outside a rotor protrudes from a yoke portion on an outer peripheral side to a center from the yoke portion, and
Seven teeth are provided in the circumferential direction and seven slots are provided. One tooth among the seven teeth, the tooth next to the tooth, and two teeth every two slots from the adjacent tooth are provided. Each is electrically insulated to form four concentrated winding main windings,
The teeth adjacent to the one main winding, the teeth of the main winding and two teeth every two slots from the same tooth are electrically insulated to form four concentrated winding auxiliary windings, The one main winding and the auxiliary winding are applied to one common tooth, and the magnetic poles of the main winding of the common tooth and the main winding of the tooth next to the same main winding have opposite polarities, The magnetic poles of the main winding of the tooth next to the shared tooth and the main winding of the tooth placed two slots from the same main winding are reversed in polarity. 2
The magnetic pole of the main winding of the tooth placed in the slot has the opposite polarity, the auxiliary winding of the tooth adjacent to the common tooth and the auxiliary winding of the same tooth has the opposite polarity, and the auxiliary winding of the common tooth has the opposite polarity. The auxiliary magnetic pole of the tooth located two slots from the wire and the auxiliary winding is reversed in polarity.
A capacitor induction motor, wherein the magnetic poles of the auxiliary winding of the tooth placed in the slot and the auxiliary main winding of the tooth placed two slots from the auxiliary winding have opposite polarities. 2. The tooth width and the magnetic pole pitch angle of the common tooth on which the one main winding and the auxiliary winding are applied are made larger than the remaining teeth, or the one main winding and the auxiliary winding are applied. 2. The capacitor induction motor according to claim 1, wherein the tooth width and the magnetic pole pitch angle of the common teeth are the same as those of the remaining teeth. 3. The method 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.
While connecting the main winding and the capacitor in parallel,
2. The capacitor induction motor according to claim 1, wherein the parallel circuit and the auxiliary winding are connected in series, and AC power is supplied to a series circuit of the main winding, the auxiliary winding and a capacitor. 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, which is a thermoplastic resin containing S. 6. The electrical insulation is made of PET, PBT, PP.
The capacitor induction motor according to claim 1, wherein the bobbin is formed using a thermoplastic resin containing S. 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.