JP2009303286A - Electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric motor which is reduced in insulation failure of a coil end popping out of the stator terminal part of the small electric motor to thereby enhance quality and improve workability. <P>SOLUTION: In a stator, a plurality of winding rings obtained by winding windings outside are inserted in order through the bottom of a slot from above the slot insulation part with a winding insertion device and are overlapped in at least two layers or more. In the motor, the connection point that is the coil end of the plurality of winding rings and connects the winding terminal parts of the lead-out wires led out from the plurality of winding rings in the space between winding rings adjacent to each other in the circumferential direction, or the returned part in the circumferential direction of the lead-out wire led out from the plurality of winding rings is positioned in at least one position. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an electric motor that is improved in workability by reducing insulation failure in a coil end portion protruding from a stator end portion of a miniaturized electric motor.

  In recent years, compressors mounted on air conditioners, refrigerators and the like have been reduced in size. Along with this, motors used in compressors are also becoming smaller and higher performance. The structure of the stator of the motor used for these is composed of a laminated iron core in which a plurality of iron plates punched out by a punching press or the like are laminated, and a slot for inserting a winding is formed in this stator. Yes. In this slot, a winding ring wound in a predetermined shape by an external winding machine is attached to the slot of the stator by a winding insertion machine and inserted from above the film-like slot insulation.

  The winding ring varies depending on the performance of the motor, the number of poles and the number of phases of the motor, and the size and shape of the winding ring itself vary greatly. In particular, when the number of poles and the number of phases increase, the number of lead lines from the winding ring increases, and the number of connection points between the lead lines or between the lead lines and the lead lines also increases. The lead wire is insulated by covering the winding drawn from the winding ring with an insulating tube. In addition, the connection points between the leader lines or between the lead lines and the lead lines are connected by soldering, welding, caulking terminals, etc., and the connection points are insulated by connection point insulation composed of a film-like insulating sheet. is doing.

  On the other hand, the winding ring inserted in the slot of the stator through the film-like slot insulation has a large amount of windings inserted into the slot due to the small size and high performance of the motor as described above. The amount of winding at the coil end portion that protrudes from the end portion of the stator is also increasing.

  The coil ends of these small, high-performance motors have lead wires drawn from each winding ring, or connection points between the lead wires and lead wires between the windings between the layers. The coil end portion of the electric motor is formed small by a pressure molding machine.

  Such an electric motor in which the connection points between the lead wires or between the lead wires and the lead wire are embedded between the windings between the layers is disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 1-186138). There is something. The configuration of Patent Document 1 is shown in FIG. In FIG. 4, the connection point 12a between the lead wire 22a and the lead wire 7a is inserted into the connection point insulation provided with a folded portion that is folded in two so that both ends of the insulating sheet do not overlap each other. As shown, the coil end portion 10a is embedded between the windings 2a between the layers.

  Another method is disclosed in Japanese Patent Application Laid-Open No. 9-84288. The configuration of Patent Document 2 is shown in FIG. In FIG. 6, the connection point 12b between the lead wire 22b and the lead wire 7b is inserted into the connection point insulation provided with the connection point accommodating portion formed in a horizontal row, and between the layers of the coil end portion 10b shown in FIG. Although it is embedded between the windings 2b which are between phases, it is not completely embedded, but the winding between the phases so that the connection point accommodating portion into which the connection point 12b is inserted exits from the surface of the coil end portion 10b. A horizontal line is formed between the lines 2b. As a result, even if the coil end portion 10b is pressure-molded, the stress on the connection point itself is relieved, and it is possible to reduce insulation failure that breaks through the connection point insulation by protrusions such as solder, welding, and crimping terminals.

JP-A-1-186138 JP-A-9-84288

  However, as described above, since the electric motor has been reduced in size and performance, the usage amount of the winding ring has increased, and the dimensions of the coil end portion have become very strict. Even measures such as Patent Document 1 and Patent Document 2 have caused insulation failure at connection points. In addition, since the lead wire drawn out from the winding ring leads and connects between different phases, the lead wire insulation tube is damaged and insulation failure occurs when the coil end portion has a severe molding dimension. For this reason, the length of each leader line must be as short as possible. In this case, there is a case where the lead wire has to be folded and fixed at the upper end portion of the coil end portion, and in the case where the forming dimension of the coil end portion is very severe, insulation failure tends to occur at the folded portion of the lead wire. In addition, since there are a plurality of connection points embedded in the coil end portion, the molding dimension of the coil end portion may not be included.

The present invention includes a yoke portion formed in an annular shape, a tooth portion extending radially from the yoke portion, a slot constituted by the yoke portion and the tooth portion, and slot insulation inserted so as to cover the slot. A stator in which a plurality of winding rings wound externally are inserted into a slot in order from the bottom of the slot by means of a winding insertion device from above the slot insulation, and inserted so as to overlap at least two layers. In
A plurality of winding rings protrude from both end portions of the stator to form a coil end portion, and the plurality of windings are formed in a gap between the winding rings adjacent to each other in the circumferential direction of the coil end portion. An electric motor in which at least one connection point connecting the winding ends of the lead wire drawn out from the ring is embedded is used.

Alternatively, a yoke portion formed in an annular shape, a tooth portion extending in the radial direction from the yoke portion, a slot constituted by the yoke portion and the tooth portion, and slot insulation is inserted so as to cover the slot. In the stator, a plurality of winding rings wound around the outside are inserted into the slot sequentially from the bottom of the slot by means of a winding insertion device from above the slot insulation, and inserted so as to overlap at least two layers.
A plurality of winding rings protrude from both end portions of the stator to form a coil end portion, and the plurality of windings are formed in a gap between the winding rings adjacent to each other in the circumferential direction of the coil end portion. Let the electric motor which located the turning part of the peripheral direction of the leader line pulled out from the wheel at least one place.

  Further, in the above-described electric motor, a lead wire provided with a terminal for connecting to the external power supply connection portion is provided at a desired fixing position at the coil end portions of the plurality of winding rings protruding from both ends of the stator. It is assumed that the length of the lead wire on the opposite terminal side that is fixed and extends in the circumferential direction of the coil end from the lead wire fixing position is substantially the same.

By using the present invention, with the recent miniaturization and high performance of electric motors, the amount of windings inserted into the slots of the stator is increased, and the molding dimensions of the coil end portion of the stator are very strict.
In the gap between the winding ring and the winding ring adjacent to each other in the circumferential direction of the coil end portion of the plurality of winding rings protruding from both ends of the stator, the lead wires drawn from the plurality of winding rings, or By embedding at least one connection point connecting the lead wire and the lead wire, it is possible to reduce an insulation failure that breaks through the insulating tube and the connection point insulation due to stress associated with the pressure forming of the coil end portion. .

  In addition, at the connection point embedded between the windings that are the phases of each layer of the coil end portion as in the past, the connection point hinders the molding dimension at the point where the connection point is embedded no matter how much pressure molding is applied. Although it could not be made smaller, it can be easily formed into a desired molding dimension by embedding it in the gap between the winding rings adjacent in the circumferential direction of the coil end portion, and stress during pressure molding It is possible to make the molding dimension of the coil end portion smaller by reducing the amount of.

  Similarly, a plurality of winding rings are drawn out into the gap between the winding rings adjacent to each other in the circumferential direction of the coil end portions of the plurality of winding rings protruding from both ends of the stator. By disposing at least one folded portion in the circumferential direction of the leader line, it is possible to reduce insulation failure that breaks through the insulating tube due to stress associated with pressure forming of the coil end portion. Thereby, since there is little stress at the time of pressure molding, it is possible to make the molding dimension of a coil end part smaller. Further, unlike the conventional case, the lead wire portion is not turned back, and the lead wire is not drawn long in the circumferential direction of the upper end portion of the coil end portion, so that insulation failure between different phases can be reduced.

In addition, the lead wire provided with a terminal for connection to the external power supply connection portion is fixed at a desired fixing position at the upper end of the coil end portion, and the non-terminal side port extending in the coil end portion circumferential direction from the fixing position of the lead wire By making all the outgoing lengths substantially the same, the connection point insulation between the lead wire and the lead wire is fixed at one place on the surface of the upper end of the coil end portion. Thereby, the embedding work of the connection point can be reduced and the connection point can be fixed at one place, so that the workability can be improved. In addition, since the connection point is not embedded between the windings that are the phases of each layer, the size of the coil end portion can be reduced, and the insulation failure between the connection point and the winding can be reduced. Furthermore, since the lead wire length can be shortened, the material cost can be reduced. Therefore, it is possible to obtain an electric motor with reduced insulation defects, excellent quality, reduced material costs, and improved workability.
In the case where the molding dimensions of the coil end part are strict and the connection point insulation has already been inserted in the gap between the winding ring adjacent to the coil end part in the circumferential direction and the embedded space is not secured. It is particularly effective.

  The present invention will be described with reference to FIG. FIG. 1 is a front view of the motor as viewed from above. The stator 1 is a laminated iron core in which a plurality of iron plates obtained by punching electromagnetic steel sheets by a punching press or the like are stacked. The laminated iron core has a yoke portion formed in an annular shape, a tooth portion extending radially from the yoke portion, and a slot 3 for inserting a winding ring 6 composed of the yoke portion and the tooth portion. Is formed. A winding ring 6 wound and formed in a predetermined shape by an external winding machine is inserted into the slot 3 from above the film-like slot insulation 4 attached to the slot 3 of the stator 1. FIG. 2 shows a state where the winding ring 6 is inserted into the slot 3 of the stator 1 of the electric motor shown in FIG. The insertion method of the winding ring 6 shown in FIG. 2 into the slot 3 is performed by a so-called distributed winding method. In addition, the electric motor shown in FIG. 1 forms a three-phase two-pole.

  In FIG. 2, only the winding ring 6 of the V-phase coil of the outermost peripheral layer inserted into the slot 3 of the stator 1 is shown as an example. In the electric motor shown in FIG. 1, the winding ring 6 wound outside is inserted from the top of the slot insulation 4 mounted in the slot 3 in the order of the outer layer winding, the middle layer winding, and the inner layer winding by the winding insertion machine. To do. In this embodiment, the outer layer winding is a V-phase coil, the middle layer winding is a W-phase coil, and the inner layer winding is a U-phase coil. Interphase insulation 9 is installed between the layers of each winding ring 6 to insulate the phases. In addition, the black circle of the interphase insulation 9 in FIG. 1 has shown the location where the connection part which connects the interphase insulation 9 which insulates the coil end part of the winding ring | wheel 6 which protruded from the both ends of the stator 1 is inserted. .

  A winding ring 6 is inserted into the stator 1 of the electric motor of FIG. 1 by a winding insertion machine, and the winding ring 6 protrudes from both ends of the stator 1 to form a coil end portion 10. A lead wire 7 having a terminal 8 for connection to an external power supply connection portion is provided at one upper end portion of the coil end portion 10 at a desired lead wire fixing position 13 at the upper end of the coil end portion 10. It is fixed by an end tie string. In the embodiment of FIG. 1, the lead wire 22 drawn from the winding end of each winding ring 6 is covered with an insulating tube and insulated. In FIG. 1, the lead lines 22 drawn from the respective winding wheels 6 are indicated by dotted lines.

  This facilitates the routing in the circumferential direction between different phases of the upper end of the coil end portion 10 of the lead wire 22. In the present embodiment, the coil end binding string that binds the winding ring 6 of the coil end portion 10 and each connection point is omitted for convenience. However, only the lead wire fixing position 13 is shown in order to clarify the position where the lead wire 7 is fixed.

The winding ring 6 of each layer in the coil end portion 10 of the winding ring 6 in FIG. 1 is the V-phase coil of the outer layer winding, and the winding end portion of the lead wire Y drawn from one side is drawn from the other phase. Connected to the winding ends of the lead wires Z and X to form a neutral point 11, and the winding end portion of the lead wire V drawn from the other side is connected to the opposite terminal side of the lead wire 7V to connect the connection point 12V. Forming.
In addition, the winding end of the lead wire Z drawn from one of the W-phase coils of the middle layer winding is connected to the winding end of the lead wires Y and X drawn from the other phase to form the neutral point 11 The winding end of the lead wire W drawn from the other side is connected to the opposite terminal side of the lead wire 7W to form a connection point 12W.
Similarly, the winding end portion of the lead wire X drawn from one side of the U-phase coil of the inner layer winding is connected to the winding end portions of the lead wires Y and Z drawn from the other phase, and the neutral point 11 is connected. The winding end of the lead wire U that is configured and drawn out from the other is connected to the opposite terminal side of the lead wire 7U to form a connection point 12U.

  In other words, one of the winding ends of the lead wires Y, Z, and X drawn from each phase of the V phase, the W phase, and the U phase is connected at one point to form a neutral point 11 and insulated. It is a connection point. Also, the other end of the lead wires V, W, U of the lead wires V, W, U drawn from the V-phase, W-phase, and U-phase are connected to the opposite terminal sides of the lead wires 7V, 7W, 7U for insulation. Connection points 12V, 12W, and 12U are provided. In addition, the connection points 12V, 12W, and 12U that are connected to the opposite terminals of the lead wires 7V, 7W, and 7U and are insulated are the coil end tie strings on the surface of the upper end portion of the coil end portion 10 in this embodiment. Is fixed in one place. As a result, it is not necessary to forcibly embed the connection point between the windings even in the case of a small molding size that is severely formed by a pressure molding machine, so the coil end part 10 is finished by soldering, welding, caulking terminals, etc. The connected portion breaks through the insulation and does not come into contact with the winding ring 6 to cause insulation failure.

  Further, the lead wire 7 fixed at a desired lead wire fixing position 13 at the upper end of the coil end portion is led out from each phase of the V phase, W phase, and U phase extending in the circumferential direction at the upper end of the coil end portion 10. The lengths of the lead wires 7V, 7W, 7U connected to the lines V, W, U from the lead wire fixing position 13 are substantially the same length. FIG. 3 shows the V-phase, W-phase, and U-phase extended from the upper end of the coil end portion 10 of the lead wire 7 fixed at a desired lead wire fixing position 13 at the upper end of the coil end portion. Only the lead wire 7 is shown in order to make it easy to understand that the lengths L of the lead wires 7V, 7W, 7U connected to the lead wires V, W, U are the same.

  As shown in FIG. 3, the lengths L of the lead wires 7V, 7W, 7U from the lead wire fixing position 13 are substantially the same length, so that a connection point is provided on the surface of the upper end portion of the coil end portion 10. The position to be fixed can be set to one place, and workability can be improved. Further, as shown in FIG. 1, connection points 12V, 12W, 12U of the lead wires 7V, 7W, 7U connected to the lead wires V, W, U from the respective phases of the V phase, the W phase, and the U phase. The coil end portion 10 is not embedded between the windings and only one neutral point 11 is provided, so that the size of the coil end portion can be reduced and the insulation between the connection point and the winding is poor. Can be reduced. Further, the length L of the lead wire 7 from the lead wire fixing position 13 can be made shorter than before, and the material cost can be reduced.

  As a result, the connection points 12V, 12W and 12U between the lead wires V, W and U drawn from the respective phases at the coil end portion 10 and the lead wires 7V, 7W and 7U can be fixed together in one place. The workability can be improved without fixing the connecting points of the lead wires and lead wires drawn out from the respective phases of the V phase, the W phase, and the U phase as in the prior art.

  Also, the connection point where one of the winding ends of the lead wires Y, Z, and X drawn from the V-phase, W-phase, and U-phase is combined at one place to be the neutral point 11 will be described first. As described above, when the coil end portion 10 is formed to be small by pressure molding, if the connection point is embedded and formed between the windings between the layers of the winding ring 6, stress is applied to the connection point itself, and soldering and welding are performed. The insulation is broken by the projection of the connection point connected by the crimping terminal or the like, and comes into contact with the winding ring 6 to cause the insulation failure.

  In FIG. 1, the connection point is embedded in a place where the coil end portion 10 is molded by a pressure molding machine and is formed at the lowest molding rate. In the coil end portion 10, the lowest forming ratio (the ratio of the winding wire diameter × the number of turns to the coil end section sectional dimension) is the winding adjacent to the circumferential direction of the winding ring 6 inserted in each layer. The position that becomes the gap between the ring 6 and the winding ring 6 is the lowest. In the embodiment of FIG. 1, it is an interelectrode portion of each layer.

This embodiment will be described with reference to FIG. The stator 1 in FIG. 1 has three phases and two poles and has 36 slots. The outer layer winding is a V-phase coil. 1-NO. 18, NO. 19-NO. A winding ring 6 is inserted into 36. NO. 36, NO. 1 and NO. 18, NO. There are two gaps between 19 and the gap.
The middle layer winding is a W-phase coil and the slot NO. 13-NO. 30, NO. 31-NO. A winding ring 6 is inserted into 12. NO. 12, NO. 13 and NO. 30, NO. Two places in the gap with 31 are the gaps.
The inner layer winding is a U-phase coil. 7-NO. 24, NO. 25-NO. A winding ring 6 is inserted into 6. NO. 6, NO. 7 and NO. 24, NO. There are two gaps in the gap with 25. Interphase insulation 9 is installed between the layers of the winding ring 6 to insulate the phases.

  Therefore, in FIG. 1, the slot NO. 36, NO. 1 and NO. 18, NO. No. 19 gap, W-phase coil slot NO. 12, NO. 13 and NO. 30, NO. 31 gap, U-phase coil NO. 6, NO. 7 and NO. 24, NO. It is better to embed the connection point in the gap between the winding ring 6 and the winding ring 6. In this embodiment, the slot NO. 36, NO. By embedding the neutral point 11 between the gaps of one gap, the stress applied to the connection point itself can be reduced even if the coil end portion 10 is very small and has a severe molding size. It is possible to reduce the occurrence of insulation failure due to breakage of the connection point insulation. In other words, the coil end portion 10 can be easily pressure-molded to have a desired molding dimension.

  In the present embodiment of FIG. 1, one of the winding ends of the lead wires V, W, U drawn from the V phase, W phase, and U phase is connected at one point, and the neutral point 11 The other end is a connection point that is insulated, and the other is connected to the opposite terminal side of each lead wire 7V, 7W, 7U and insulated as a connection point 12V, 12W, 12U. The upper end portion of each of the two pieces is put together at one place and fixed with a coil end tied string.

  In the embodiment of FIG. 1, the connection point embedded in the gap between the winding ring 6 and the winding ring 6 is one point of the neutral point 11, but at least the lead terminals 7V, 7W, 7U of each phase Even if the connection points 12V, 12W, 12U, which are connected to the side and insulated, are embedded in the gap between the winding ring 6 and the winding ring 6, the stress applied to the connection point itself can be reduced, and solder, welding, caulking terminals It can be reduced that the insulation at the connection point is damaged due to the projections such as the like, resulting in poor insulation. In addition, although the embedding position of each connection point is embedded in the part of the gap between the winding ring 6 and the winding ring 6, the same effect can be obtained by embedding in the vicinity of the clearance between the winding ring 6 and the winding ring 6.

  In addition, the lead wires V, W, and U drawn from the V-phase, W-phase, and U-phase are provided with insulating tubes, but as described above, the coil end portion 10 is formed by a pressure molding machine. In the coil end portion 10 formed into a small shape, the lead wires V, W, U are extended in the circumferential direction of the coil end portion and connected to the lead wires 7V, 7W, 7U of each phase, or the lead wires Y, Z, X are connected. When connecting at the neutral point 11 extending in the circumferential direction of the coil end portion, it may be necessary to provide the folded portion 14 in the middle of the wiring work. When each lead wire 22 (same as V, W, U, Y, Z, and X) is folded between the windings that are phases of each layer and is pressure-molded, each lead wire 22 is formed when the forming dimension is very small and severe. Stress is applied to the folded portion of the lead wire, breaking through the insulating tube of the lead wire 22 and contacting between different phases, resulting in poor insulation.

  In FIG. 1, it arrange | positions so that the folding | turning part 14 of each leader line 22 may come to the place where the shaping | molding rate is the lowest when the coil end part 10 was shape | molded small with the press molding machine. In the coil end portion 10, the lowest forming ratio (the ratio of the winding wire diameter × the number of turns to the coil end section sectional dimension) is the winding adjacent to the circumferential direction of the winding ring 6 inserted in each layer. The position where there is a gap between the ring 6 and the winding ring 6 is the lowest. In the embodiment of FIG. 1, it is an interelectrode portion of each layer. The inter-electrode portion of each phase in the embodiment of FIG. 1 is as described above.

  Therefore, in FIG. 1, the slot NO. 36, NO. 1 and NO. 18, NO. No. 19 gap, W-phase coil slot NO. 12, NO. 13 and NO. 30, NO. 31 gap, U-phase coil NO. 6, NO. 7 and NO. 24, NO. The coil end portion 10 is formed into a very small and strict size by disposing at least one folded portion 14 of each lead wire in the gap between the winding ring 6 and the winding ring 6. However, the stress applied to the folded portion 14 of each lead wire 22 can be reduced, and the insulation tube can be prevented from being damaged and causing poor insulation.

  In the present embodiment of FIG. 1, the position of the turn-back portion 14 of each lead wire 22 is such that the lead wire X drawn from the U-phase coil of the inner layer winding toward the neutral point 11 is connected to the neutral point 11. A folded portion 14 is provided in front. This turn-up portion 14 has a slot NO. 36, NO. 1 is wound between the poles of the gap between the winding ring 6 and the winding ring 6. Similarly, the turn-back portion 14 is provided before the lead wire U drawn out from the U-phase coil of the inner layer winding toward the lead wire 7U is connected to the lead wire 7U. This turn-up portion 14 has a slot NO. 18, NO. Folded between the poles of the gap between 19 winding ring 6 and winding ring 6. The folded portion 14 of each lead wire 22 has a folded portion located between the gaps between the winding ring 6 and the winding ring 6, but is positioned near the gap between the winding ring 6 and the winding ring 6. But there are similar effects.

  Although the electric motor of this embodiment is a three-phase two-pole as shown in FIG.1 and FIG.2, it can also be used for a single-phase electric motor. In addition, it is effective in multi-pole motors and in-phase winding rings where there are many connection points and a lot of connection points must be embedded in the coil ends, or in motors where there are many folded portions of each lead wire. It can be used in various electric motors with severe end portion molding dimensions.

The schematic diagram which showed arrangement | positioning of the main components of the electric motor of this embodiment. The figure which inserts the winding ring shown in FIG. 1 in the slot of a stator. The figure which shows the non-terminal side length L from the lead wire fixed position of the lead wire shown in FIG. The figure which showed the connection point of conventional embodiment. The figure which embedded the connection point shown in FIG. 4 in the coil end part. The figure which showed the connection point of another conventional embodiment. The figure which embedded the connection point shown in FIG. 6 in the coil end part.

Explanation of symbols

1, 1a ... Stator 2, 2a, 2b ... Winding 3 ... Slot 4, 4a ... Slot insulation 6 ... Winding wheel 7, 7U, 7V, 7W, 7a, 7b .... Lead wire 8 ... Terminal 9 ... Interphase insulation 10, 10a, 10b ... Coil end 11 ... Neutral point 12, 12U, 12V, 12W, 12a, 12b ... Connection point 13 ... Lead wire fixing position 14 ... Leader line folding portion 22, 22a, 22b, U, V, W, X, Y, Z ... Leader wire

Claims (3)

A yoke part formed in an annular shape, a tooth part extending in the radial direction from the yoke part, a slot constituted by the yoke part and the tooth part, and slot insulation is inserted so as to cover the slot, In the stator, a plurality of winding rings wound around the outside are inserted into the slot sequentially from the bottom of the slot by a winding insertion device from above the slot insulation, and inserted so as to overlap at least two layers.
A plurality of winding rings protrude from both end portions of the stator to form a coil end portion, and the plurality of windings are formed in a gap between the winding rings adjacent to each other in the circumferential direction of the coil end portion. An electric motor characterized in that at least one connection point connecting winding ends of a lead wire drawn out from a ring is embedded. A yoke part formed in an annular shape, a tooth part extending in the radial direction from the yoke part, a slot constituted by the yoke part and the tooth part, and slot insulation is inserted so as to cover the slot, In the stator, a plurality of winding rings wound around the outside are inserted into the slot sequentially from the bottom of the slot by a winding insertion device from above the slot insulation, and inserted so as to overlap at least two layers.
A plurality of winding rings protrude from both end portions of the stator to form a coil end portion, and the plurality of windings are formed in a gap between the winding rings adjacent to each other in the circumferential direction of the coil end portion. An electric motor characterized in that a circumferential folding portion of a leader line drawn from a ring is positioned at at least one location. A lead wire provided with a terminal for connecting to an external power supply connection portion is fixed to a coil end portion of a plurality of winding rings protruding from both ends of the stator at a desired fixing position. 3. The electric motor according to claim 1, wherein the lengths of the lead wires on the side opposite to the terminal extending in the circumferential direction of the coil end from the fixed position of the lead wires are substantially the same.

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