JP2012157207A - Electric motor stator, compressor, and device - Google Patents

Electric motor stator, compressor, and device Download PDF

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Publication number
JP2012157207A
JP2012157207A JP2011016052A JP2011016052A JP2012157207A JP 2012157207 A JP2012157207 A JP 2012157207A JP 2011016052 A JP2011016052 A JP 2011016052A JP 2011016052 A JP2011016052 A JP 2011016052A JP 2012157207 A JP2012157207 A JP 2012157207A
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Japan
Prior art keywords
coil
stator
neutral point
electric motor
stator winding
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JP2011016052A
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Japanese (ja)
Inventor
Yasuo Nanbu
靖生 南部
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Panasonic Corp
パナソニック株式会社
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Priority to JP2011016052A priority Critical patent/JP2012157207A/en
Publication of JP2012157207A publication Critical patent/JP2012157207A/en
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Abstract

A low-cost and high-insulation stator for a motor that is resistant to magnetization stress even when the stator of the motor is used as a magnetizing yoke for a rotor, and a method for insulating a stator winding.
A strip-like coil end insulating film 13 is inserted between a coil end outer peripheral portion of a stator winding 11 and a plurality of neutral point connecting wires 12 and fixed with a coil end tying thread 14; In this configuration, the coil end of the stator winding 11 and the neutral point connection line 12 are insulated. The stator winding 11 is fixed with a coil end binding thread 14, and a strip-shaped insulation is provided between the coil end outer peripheral portion of the stator winding 11 and a plurality of neutral point connecting wires 12 gathered at a neutral point. Insert a coil end insulating film 13 in which the film is wound around the entire or part of the coil end of the stator winding 11, and the coil end and the coil end insulating film of the stator winding with the coil end binding thread 14. 13 are bundled together.
[Selection] Figure 1

Description

  The present invention relates to a stator of an electric motor used in, for example, an air conditioner, a refrigeration device, a hot water supply device, and an automobile.

  In recent years, brushless motors, which are more efficient than induction motors, have been used for motor elements used for air conditioners, refrigerators, water heaters, automobiles, and the like with the energy saving of the main body. Even in this brushless motor, there is a method of inserting a coil as a means for winding the stator, and the stator of this type of electric motor is provided between different poles of the coil end portion of the stator winding as shown in FIG. There has been proposed one that lowers the generated potential difference and improves insulation performance (see, for example, Patent Document 1). In the stator described in Patent Document 1, the interphase insulating paper 23 is inserted into the coil end portion of the stator winding 21 in the stator core 20 and is fixed with the coil end binding yarn 22, and between different poles where a potential difference occurs. It has a configuration that can ensure insulation.

  Further, as a stator of a hermetic electric compressor, an electric motor using an insulator molded with liquid crystal polymer resin, polyphenylene sulfide resin or the like on the end face of the stator core as shown in FIG. 10 has been proposed (for example, a patent) Reference 2). The stator described in Patent Document 2 has a configuration in which insulation between phases in which a potential difference occurs is secured by mounting an insulator 32 on a stator core 30 and performing salient pole concentrated windings 31.

JP 2006-262629 A JP 2004-52730 A

  As a method for insulating a stator winding of an electric motor, it is generally necessary to insulate a portion having a largest potential difference (between different poles). For example, as shown in the connection diagram of the brushless motor in FIG. Since the potential difference between the phase (U phase, V phase, W phase) and the neutral point is 1 / √3 of the interphase voltage, insulation was not positively performed. However, in applications where the voltage applied to the stator winding is high, the neutral point connection line is insulated from each phase (U phase, V phase, W phase). It is electrically insulated. However, in this method, as the number of electric motors increases, the number of neutral point connection lines gathered to the neutral point increases, resulting in a large work man-hour and a large coil end size. On the other hand, in a brushless motor, a permanent magnet is usually used for a rotor, and there is a method of magnetizing the permanent magnet by applying a high voltage current to a stator winding. In this magnetizing method, the permanent magnet can be magnetized by applying a high current and high current to the stator winding once or twice, but the stator winding is subjected to magnetization stress. Therefore, there is a case where a magnetized spark is generated at a location where the insulation performance of the stator winding is low and the stator has a breakdown voltage failure.

  Further, in the structure shown in FIG. 10, when coil end insulation is performed, an insulator molded product made of liquid crystal polymer resin, polyphenylene sulfide resin, polybutylene terephthalate resin, etc., and a neutral point connection terminal (not shown) are used. There is a method of electrically insulating with a structure in which the neutral point connection line is not directly touched, but this method requires an increase in the amount of resin used for the insulator or a mold cost for the resin molded product.

  As described above, as the number of poles increases, the number of neutral point connection lines gathering to the neutral point increases as described above, so that the shape of the insulator becomes complicated and the configuration becomes difficult.

  The present invention has been made in view of the above-described conventional problems. The object of the present invention is to use a stator of an electric motor as a magnetizing yoke of a rotor, or to resist magnetization stress and to increase the number of poles. The present invention provides a configuration that is inexpensive and further improves the insulation performance.

  In order to solve the above-described conventional problems, a first invention according to the present application includes a stator core in which a plurality of thin steel plates each having a plurality of slots are stacked, and windings in the slots of the stator core. In a stator of an electric motor composed of a stator winding applied and a binding thread that fixes the stator winding, between a coil end outer peripheral portion of the stator winding and a plurality of neutral point connection lines A stator for an electric motor having a configuration in which a band-shaped coil end insulating film is inserted and a coil end of a stator winding and a coil end insulating film are bundled together with the binding thread.

  Further, according to a second invention of the present application, in the first invention, the coil end insulating film is provided with a neutral point fixing portion, and the neutral point fixing portion is further bent along the coil end end surface. The stator of the electric motor having a configuration in which the coil end of the stator winding and the neutral point connection are insulated together.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the fixing of the electric motor having a shape that is inserted into the coil end insulating film at several locations in the slot of the stator core and prevents lateral displacement. A child.

  A fourth invention according to the present application is a compressor including the stator of the electric motor according to the first to third inventions.

  A fifth invention according to the present application is an apparatus including the stator of the electric motor according to the first to third inventions.

  According to the stator of the electric motor of the present invention, a strip-shaped coil end insulating film is inserted between the coil end of the stator winding and the neutral point connecting line, and the coil end of the stator winding and the neutral point connecting line are inserted. By insulating the gap, it can be characterized by being resistant to magnetization stress and inexpensive and further improving the insulation performance.

Structural sectional view of stator of electric motor of embodiment The perspective view of the stator of the electric motor of an Example Explanatory drawing which shows the coil end insulating film of an Example Explanatory drawing which shows the connection of the stator winding | coil of an Example Explanatory drawing which shows the connection method of the stator winding | coil of an Example Explanatory drawing which shows the coil end insulating film of an Example Structural sectional view of stator of electric motor using coil end insulating film of embodiment Explanatory drawing which shows the coil end insulating film of an Example The perspective view of the stator of the electric motor which shows the prior art 1 The perspective view of the stator of the electric motor which shows the prior art 2

  The present invention provides a stator core in which a plurality of thin steel plates having a plurality of slots are stacked, a stator winding in which a winding is provided in a slot of the stator core, and fixing the stator winding In a stator of an electric motor composed of a binding thread, a strip-shaped coil end insulating film is inserted between the outer periphery of the coil end of the stator winding and a plurality of neutral connection lines, and fixed with the binding thread. This is a stator of an electric motor having a configuration in which a coil end of a child winding and a coil end insulating film are bundled together.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a structural sectional view of a stator of an electric motor according to an embodiment of the present invention. As shown in this figure, the stator of the electric motor of the present invention includes a stator core 10 in which a plurality of thin steel plates each having a plurality of slots are stacked, and a stator winding in which windings are provided in the slots of the stator core. The wire 11 and the stator winding 11 are connected to the lead wire 15. Further, the stator winding 11 is fixed with a coil end tie thread 14, and a plurality of neutral point connecting lines gathered at the coil end outer peripheral portion of the stator winding 11 and the neutral point in the stator of this electric motor. 12, a coil end insulating film 13 in which a coil-shaped insulating film is arranged so as to wind all around or part of the coil end of the stator winding 11 is inserted, and the stator winding is wound with a coil end binding thread 14. The coil end and the coil end insulating film 13 are bundled together.

  FIG. 2 is a perspective view of the stator of the electric motor shown in FIG. 1 according to an embodiment of the present invention. As shown in this figure, a plurality of neutral point connecting wires 12 drawn out from the slot are insulated from the stator winding 11 by a coil end insulating film 13 and are further bound by a coil end binding thread 14. .

  Next, the operation of the electric motor configured as described above will be described. Since the coil end of the stator winding 11 and the neutral point connection line 12 are electrically insulated by the coil end insulating film 13, there is an effect of improving the dielectric strength. For example, a rotor in which a permanent magnet is arranged On the other hand, when the stator winding 11 is a magnetized yoke, the occurrence of magnetized sparks can be suppressed since it is not easily affected by the magnetizing stress. In addition, when the stator of the motor is handled, even if scratches, indentations, metal foreign matters, etc. are mixed into the coil end of the stator winding 11, the coil end insulating film 13 is electrically insulated and the same as described above. It is possible to improve the insulation performance.

  FIG. 3 is a view showing the coil end insulating film 13 according to one embodiment of the present invention. This coil end insulating film is mainly made of polyethylene terephthalate resin having a thickness of 0.075 mm to 0.3 mm. However, resin members such as polyethylene naphthalate resin and polyphenylene sulfide resin can obtain the same effect as polyethylene terephthalate resin. .

  FIG. 4 is a diagram showing the connection of the stator windings according to one embodiment of the present invention. This connection is a connection diagram in the case where the number of poles is 6 and the stator is 9 slots. In such a connection method, the total number of neutral point connection lines gathered at the neutral point is nine. When the number of poles further increases, the number of neutral point connection lines increases, and when the stator is used in a magnetized yoke, insulation performance is required, so that the present invention provides a more effective effect.

  FIG. 5 shows an embodiment of the present invention and shows the connection diagram shown in FIG. 4 and a method of connecting the stator windings. As shown in this figure, it is necessary to connect all 9 slot neutral point connection lines to one neutral point, but all these neutral line connection lines are inserted into the neutral point insulation tube 16. Yes. Furthermore, as a method of insulating the coil end of the stator winding, the coil end insulating film 13 shown in FIG. By means, it is possible to insulate the coil end of the stator winding from the neutral point connection line.

  6 is a view showing a coil end insulating film 13 according to an embodiment of the present invention, and FIG. 7 is a structural sectional view of a stator of an electric motor using the coil end insulating film shown in FIG. 6 (between A and A). It is. The coil end insulating film 13 is obtained by adding a neutral point fixing portion to the shape of the coil end insulating film 13 shown in FIG. 3 and bending the neutral point fixing portion into an L shape along the end surface of the coil end. Here, the neutral point connecting line 12 collected at the neutral point and the neutral point insulating tube 16 shown in FIG.

  In the coil end insulating film 13 shown in FIG. 3, it is necessary to fix the neutral point insulating tube 16 at the outer periphery of the coil end. In the coil end insulating film 13 shown in FIG. It becomes possible to place it on the end face, and the neutral point insulating tube 16 is stabilized, so that the workability of winding is improved, and the effect of making a low-priced product is obtained.

    FIG. 8 is a view showing the coil end insulating film 13 according to one embodiment of the present invention. This coil end insulating film is further added with a lateral misalignment preventing projection in the shape shown in FIG. 6, and the lateral misalignment preventing projection is inserted into the slots of the stator winding at several locations (four locations in FIG. 6). Furthermore, winding workability is improved, and the effect of making a low-priced product can be obtained.

  Even if the stator of the electric motor of the present invention is used as a magnetizing yoke of a rotor, it is strong against magnetizing stress, and even if the number of poles is increased, it can be provided that the insulation performance is further improved at a low cost.

DESCRIPTION OF SYMBOLS 10 Stator iron core 11 Stator winding 12 Neutral point connection line 13 Coil end insulating film 14 Coil end binding thread 15 Lead wire 16 Neutral point insulating tube 20 Stator core 21 Stator winding 22 Coil end binding thread 23 Interphase Insulating paper 30 Stator core 31 Salient pole concentrated winding 32 Insulator

Claims (5)

  1. Consists of a stator core in which a plurality of thin steel plates each having a plurality of slots are laminated, a stator winding in which a winding is provided in a slot of the stator core, and a binding thread for fixing the stator winding In the stator of the electric motor, a strip-shaped coil end insulating film is inserted between the coil end outer peripheral portion of the stator winding and a plurality of neutral point connecting wires, and the stator winding is bound by the binding thread. An electric motor stator having a configuration in which a coil end and a coil end insulating film are bundled together.
  2. 2. A stator for an electric motor according to claim 1, wherein a neutral point fixing portion is provided on the coil end insulating film, and the neutral point fixing portion is further bent along the end surface of the coil end. The stator of the electric motor comprising a configuration in which the coil end and the neutral point connection portion of the coil are insulated together.
  3. The stator of the electric motor according to claim 1, wherein the stator has a shape that is inserted into the coil end insulating film at a plurality of slots in the stator core and prevents lateral displacement.
  4. A compressor comprising the stator of the electric motor according to any one of claims 1 to 3.
  5. The apparatus which comprises the stator of the electric motor as described in any one of Claims 1 thru | or 3.
JP2011016052A 2011-01-28 2011-01-28 Electric motor stator, compressor, and device Pending JP2012157207A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104184224A (en) * 2013-05-20 2014-12-03 现代摩比斯株式会社 Engine with distributed winding stator

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5540609U (en) * 1978-09-06 1980-03-15
JPS5763460U (en) * 1980-10-01 1982-04-15
JPS63265536A (en) * 1987-04-23 1988-11-02 Hitachi Ltd Armature winding for rotary electric machine
JPH0321969U (en) * 1989-07-07 1991-03-06
JP2006271051A (en) * 2005-03-23 2006-10-05 Matsushita Electric Ind Co Ltd Stator for brushless motor
JP2007306721A (en) * 2006-05-12 2007-11-22 Oriental Motor Co Ltd Stator coil insulating structure of dynamo-electric machine
JP2010115058A (en) * 2008-11-07 2010-05-20 Daikin Ind Ltd Compressor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5540609U (en) * 1978-09-06 1980-03-15
JPS5763460U (en) * 1980-10-01 1982-04-15
JPS63265536A (en) * 1987-04-23 1988-11-02 Hitachi Ltd Armature winding for rotary electric machine
JPH0321969U (en) * 1989-07-07 1991-03-06
JP2006271051A (en) * 2005-03-23 2006-10-05 Matsushita Electric Ind Co Ltd Stator for brushless motor
JP2007306721A (en) * 2006-05-12 2007-11-22 Oriental Motor Co Ltd Stator coil insulating structure of dynamo-electric machine
JP2010115058A (en) * 2008-11-07 2010-05-20 Daikin Ind Ltd Compressor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104184224A (en) * 2013-05-20 2014-12-03 现代摩比斯株式会社 Engine with distributed winding stator

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