JP6943317B1 - Crossover unit, stator, and rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crossover unit capable of improving productivity and accurately detecting a crossover temperature. SOLUTION: The crossovers 36U, 36V, 36W in which a coil is connected to one end in the length direction and power is input to the other end, and temperature detecting elements 37, 38 fixed to the crossover are provided. In the crossover unit 35, the crossover is made of a round wire, and flat flat portions 36U1, 36V1, 36W1 are provided in a part of a region in the length direction, and the temperature detecting element is fixed in a manner of directly contacting the flat portion. Will be done. [Selection diagram] FIG. 9

Description

The present invention relates to a crossover unit, a stator, and a rotating machine.

Conventionally, as a crossover unit mounted on a stator, a crossover wire in which a winding wound around a stator core is connected to one end in the length direction and power is input to the other end in the length direction. Those provided with a temperature detecting element fixed to a crossover are known.

For example, the crossover unit described in Patent Document 1 includes a coil as a winding wire, a neutral wire as a crossover wire, and a temperature detecting element. The neutral wire consists of a flat wire, a coil is connected to one end in the length direction, and power is input to the other end in the length direction. The temperature detection element is sealed in the resin molded by the mold member and fixed to the neutral wire via the resin.

Japanese Unexamined Patent Publication No. 2018-121389

In the crossover unit described in Patent Document 1, it takes time and effort to form a neutral wire (crossover wire) composed of a flat wire that is hard to be deformed into a predetermined shape, which causes a problem that productivity is lowered. There is. Further, since heat loss occurs in the resin interposed between the neutral wire and the temperature detecting element, there is also a problem that the temperature detection accuracy of the neutral wire is lowered.

The present invention has been made in view of the above background, and an object of the present invention is a crossover unit, a stator, and a rotation capable of improving productivity and accurately detecting the temperature of a crossover. To provide an opportunity.

One aspect of the present invention is a crossover wire to which a winding wound around a stator core is connected to one end portion in the length direction and power is input to the other end portion in the length direction, and a crossover wire. A crossover unit including a temperature detection element to be fixed, wherein the crossover is composed of a round wire and has a flat flat portion in a part of a region in the length direction, and the temperature detection element is the said. It is characterized in that it is fixed in a manner of directly contacting a flat portion.

According to the present invention, there is an excellent effect that the productivity of the crossover unit can be improved and the temperature of the crossover can be detected with high accuracy.

It is a perspective view which shows the state which removed the motor cover in the motor which concerns on embodiment. It is a perspective view which shows the same motor with the motor cover and the flange removed. It is a perspective view which shows the motor with the motor cover and the electrical cover removed from the rear side. It is a perspective view which shows the stator of the motor from the rear side. It is a perspective view which shows the stator from the front side. It is a perspective view which shows the crossover unit of the stator. It is a perspective view which shows the sealing area of the crossover for U phase, the crossover for V phase, and the crossover for W phase in the same crossover unit. It is a perspective view which shows the sealing region of the crossover for U phase, V phase, and W phase together with the 1st temperature detection element and the 2nd temperature detection element. It is sectional drawing which shows the cross section of the mold resin of the crossover unit together with each crossover and each temperature detection element.

Hereinafter, an embodiment of a motor as a rotating machine to which the present invention is applied will be described with reference to each figure.
FIG. 1 is a perspective view showing the motor 1 with the motor cover removed. FIG. 2 is a perspective view showing the motor 1 with the motor cover and the flange (3 in FIG. 1) removed. The motor 1 includes a housing 2, a flange 3, a shaft 9, a rotor (rotor) 10, a stator (stator) 20, an electrical cover 80, and the like.

The shaft-shaped shaft 9 penetrates the shaft hole provided in the center of the rotor core of the cylindrical rotor 10 in the direction of the rotation axis A, and is located on the rotation axis A of the rotor 10. The shaft 9 is rotationally driven around the rotation axis A together with the rotor 10. Hereinafter, the extending direction of the rotation axis A and the direction parallel to the extending direction A are simply referred to as an axial direction.

Of both ends of the shaft 9 in the axial direction, the end on the drive output side (the end to which the motor gear or the like is fixed) protrudes from the end face of the rotor 10. Hereinafter, of both sides in the axial direction, the side that is the drive output side is referred to as the front side, and the opposite side is referred to as the rear side. Further, the circumferential direction centered on the rotation axis A is simply referred to as a circumferential direction. Further, the radial direction centered on the rotation axis A is simply referred to as the radial direction.

A flange 3 protruding in the radial direction from the outer peripheral surface of the housing 2 is fixed to the front end of the housing 2. A motor cover (not shown) is bolted to the front side of the flange 3. The motor cover is provided with a shaft hole, and is exposed to the outside by penetrating the end portion of the shaft 9 on the drive output side. Each of both ends in the axial direction of the cylindrical housing 2 is provided with an opening. Of these openings, the opening on the front side is closed by the motor cover described above. Further, the opening on the rear side is closed by the electrical cover 80.

The housing 2 made of a cast product functions as a motor housing for accommodating the rotor 10 and the stator 20, and holds the cylindrical stator 20 on the inner peripheral surface. The cylindrical rotor 10 is housed in the hollow of the stator 20 held in the housing 2. The rotor 10 is a magnet-embedded type (IPM: embedded magnet type (IPM: Interior permanent Magnet) rotor, but may be a surface magnet type (SPM: Surface Permanent Magnet) rotor. May be a rotor without a permanent magnet.

FIG. 3 is a perspective view showing the motor 1 with the motor cover and the electrical cover (80 in FIG. 1) removed from the rear side. An electrical component is arranged on the rear side of the housing 2, and the electrical component is covered with an electrical cover (80 in FIG. 2). A rotation detector (resolver) 30 for detecting the rotation speed of the rotor 10, a crossover unit 35, and the like are arranged in the electrical unit.

FIG. 4 is a perspective view showing the stator 20 from the rear side. FIG. 5 is a perspective view showing the stator 20 from the front side. The stator 20 includes a cylindrical stator core 21, a plurality of coils 22 as windings wound around the stator core 21, and a crossover unit 35. On the inner peripheral surface of the stator core 21, a plurality of teeth (tooth portions) 21a projecting from the outside to the inside in the radial direction and extending in the axial direction are arranged in a manner in which they are arranged at predetermined intervals in the circumferential direction.

FIG. 6 is a perspective view showing the crossover unit 35. The crossover unit 35 includes a U-phase crossover 36U, a V-phase crossover 36V, a W-phase crossover 36W, a U-phase terminal 40U, and a V-phase terminal 40V, W in a three-phase AC power supply. It is equipped with a phase terminal 40W or the like. Four crossover lines 36U, four crossover lines 36V, and four crossover lines 36W are arranged. Of the four crossover lines 36U, two are formed into a shape in which one end side in the length direction extends in the circumferential direction and the other side extends from the front side to the rear side. With respect to such a shape, the other two crossover lines 36U are formed in a point-symmetrical shape centered on the rotation axis (A in FIG. 1). The crossover 36V and the crossover 36W are also formed in the same manner as the crossover 36U.

The U phase is an example of the first phase in the present invention, the V phase is an example of the second phase in the present invention, and the W phase is an example of the third phase in the present invention. The relationship between the phase and the first phase, the second phase, and the third phase is not limited to the above-mentioned example.

Each of the crossover 36U, the crossover 36V, and the crossover 36W is composed of an enamel wire as a round wire (electric wire having a circular cross section). Each of the crossover wire 36U, the crossover wire 36V, and the crossover wire 36W made of enamel wire as a round wire is easily deformed as compared with the crossover wire made of a flat wire (a wire having a rectangular cross section) and is easily formed. NS. Therefore, according to the motor 1 according to the embodiment, the crossover 36U, the crossover 36V, and the crossover 36W can be easily formed, and the productivity of the crossover unit 35 can be improved.

A U-phase coil (22) is connected to one end of each of the four crossovers 36U in the length direction. Further, a terminal 40U is fixed to the other end of each of the four crossover lines 36U by caulking. A U-phase power supply output from an external power supply is input to the terminal 40U. A coil (22) for the V phase is connected to one end in the length direction of each of the four crossovers 36V. Further, a terminal 40V is fixed to the other end of each of the four crossover lines 36V by caulking. A V-phase power supply output from an external power supply is input to the terminal 40V. A W-phase coil (22) is connected to one end of each of the four crossovers 36W in the length direction. Further, a terminal 40W is fixed to the other end of each of the four crossover lines 36W by caulking. A W-phase power supply output from an external power supply is input to the terminal 40W.

The crossover unit 35 includes a mold resin 39, a first temperature detecting element (thermistor) described later, and a second temperature detecting element (thermistor) described later.

A part of the length direction in two of the four crossovers 36U, a part of the length of two of the four crossovers 36V, and a part of the length of the four crossovers 36W. A part of the two regions is covered with a mold resin 39 as a sealing body and sealed. Hereinafter, the region covered by the mold resin 39 in each crossover is referred to as a sealing region.

FIG. 7 is a perspective view showing a sealing region of the crossover 36U, the crossover 36V, and the crossover 36W. As shown, one of the four crossovers 36U comprises a flat flat portion 36U1 in the sealing region. Further, one of the four crossover lines 36V is provided with a flat flat portion 36V1 in the sealing region. Further, one of the four crossover lines 36W has a flat flat portion 36W1 in the sealing region. Each of the flat portion 36U1, the flat portion 36V1, and the flat portion 36W1 is formed by press working.

FIG. 8 is a perspective view showing the sealing region of the crossover 36U, the crossover 36V, and the crossover 36W together with the first temperature detecting element 37 and the second temperature detecting element 38. The shapes of the first temperature detecting element 37 and the second temperature detecting element 38 are flat as shown in the drawing. The first temperature detecting element 37 is sandwiched between the flat portion 36U1 of the crossover line 36U and the flat portion 36V1 of the crossover line 36V, and is arranged so as to be in direct contact with the flat portion 36U1 and the flat portion 36V1. Further, the second temperature detecting element 38 is sandwiched between the flat portion 36V1 of the crossover 36V and the flat portion 36W1 of the crossover 36W, and is arranged in such a manner that it directly contacts the flat portion 36V1 and the flat portion 36W1. ..

In the crossover unit 35, unlike the crossover unit described in Patent Document 1, between the first temperature detecting element 37 and the flat portion 36U1 and between the first temperature detecting element 37 and the flat portion 36V1. No resin is used. Therefore, the heat of the flat portion 36U1 and the flat portion 36V1 is satisfactorily transferred to the first temperature detecting element 37 without causing heat loss due to the resin. Therefore, according to the motor 1 according to the embodiment, the temperatures of the crossover 36U and the crossover 36V can be accurately detected by the first temperature detecting element 37.

Further, in the crossover unit 35, unlike the crossover unit described in Patent Document 1, between the second temperature detecting element 38 and the flat portion 36V1 and between the second temperature detecting element 38 and the flat portion 36W1. No resin is used. Therefore, the heat of the flat portion 36V1 and the flat portion 36W1 is satisfactorily transferred to the second temperature detecting element 38 without causing heat loss due to the resin. Therefore, according to the motor 1 according to the embodiment, the temperatures of the crossover 36V and the crossover 36W can be accurately detected by the second temperature detecting element 38.

Since the first temperature detecting element 37 has a flat shape, the contact area with the flat portion 36U1 and the flat portion 36V1 is increased and the amount of heat conduction per unit time is increased as compared with the case where the first temperature detecting element 37 has a cylindrical shape. .. As a result, the first temperature detecting element 37 can quickly and accurately detect the temperature change of the crossover 36U and the crossover 36V. The second temperature detecting element 38 can also quickly and accurately detect the temperature changes of the crossover 36V and the crossover 36W for the same reason as the first temperature detecting element 37.

FIG. 9 is a cross-sectional perspective view showing a cross section of the mold resin 39 together with each crossover and each temperature detecting element. The mold resin 39 is molded in the following manner. That is, the first temperature detection element 37 is sandwiched between the flat portion 36U1 and the flat portion 36V1, the second temperature detection element 38 is sandwiched between the flat portion 36V1 and the flat portion 36W1, and each flat portion (36U1). , 36V1, 36W1) and each temperature detection element (37, 38) are sealed. According to such an embodiment, the mold resin 39 has the first temperature detection element 37 in good contact with the flat portion 36U1 and the flat portion 36V1 and the second temperature detection element 38 in good contact with the flat portion 36V1 and the flat portion 36W1. Maintain the state of letting. According to the motor 1, by maintaining the above-mentioned state, the temperature of each crossover (36U, 36V, 36W) can be stably detected over a long period of time.

Examples of the method for molding the mold resin 39 include injection molding. As the injection molding mold, it is desirable to use a mold having a positioning pin that abuts from the outside in the radial direction with respect to the flat portion 36U1 and a positioning pin that abuts from the inside in the radial direction with respect to the flat portion 36W1. By using such a mold, the mold can be easily positioned. In addition, the first temperature detecting element 37 is surely sandwiched between the flat portion 36U1 and the flat portion 36V1, and the second temperature detecting element 38 is surely sandwiched between the flat portion 36V1 and the flat portion 36W1. In this state, each flat portion and each temperature detecting element can be resin-sealed.

Although an example in which the present invention is applied to the motor 1 as a rotating machine has been described, the present invention can also be applied to a generator (dynamo) as a rotating machine.

The present invention is not limited to the above-described embodiment, and a configuration different from the embodiment may be adopted as long as the configuration of the present invention can be applied. The present invention exerts a peculiar action and effect for each aspect described below.

[First aspect]
In the first aspect, a winding (for example, a coil 22) wound around a stator core (for example, a stator core 21) is connected to one end in the length direction, and a power supply is input to the other end in the length direction. A crossover unit including a crossover wire (for example, a crossover wire 36U, 36V, 36W) and a temperature detection element (for example, a first temperature detection element 37, a second temperature detection element 38) fixed to the crossover wire. (For example, a crossover unit 35), wherein the crossover consists of a round wire (for example, an enamel wire) and is a flat portion (for example, flat portions 36U1, 36V1) flat in a part of the length direction. 36W1) is provided, and the temperature detecting element is fixed in a manner of directly contacting the flat portion.

According to the first aspect, it is possible to easily form a crossover wire made of a round wire, which is easily deformable, as compared with a crossover wire made of a flat wire, so that the productivity of the crossover unit can be improved. can. Further, according to the first aspect, since the resin is not interposed between the crossovers in contact with each other and the temperature detecting element, heat loss due to the resin can be avoided and the temperature of the crossovers can be detected with high accuracy. ..

[Second aspect]
The second aspect is a crossover unit having the configuration of the first aspect and characterized in that the shape of the temperature detecting element is a flat shape.

According to the second aspect, the flat temperature detecting element has a larger contact area with the flat portion of the crossover and a larger amount of heat conduction per unit time than the cylindrical temperature detecting element. Therefore, the temperature change of the crossover can be detected quickly and accurately.

[Third aspect]
A third aspect is a crossover unit comprising the configuration of the second aspect and a sealing body (for example, a mold resin 39) molded in a manner of sealing the temperature detecting element and the flat portion. ..

According to the third aspect, the sealed body can maintain a state in which the temperature detecting element and the flat portion of the crossover are in close contact with each other.

[Fourth aspect]
The fourth aspect comprises the configuration of the third aspect. Further, in the fourth aspect, the temperature detecting element includes at least a first temperature detecting element and a second temperature detecting element, and the first phase power source of the three-phase power source is input as the crossover for the first phase. A crossover (for example, a crossover 36U), a second-phase crossover (for example, a crossover 36V) to which a second-phase power supply is input, and a third-phase crossover (for example, a crossover wire 36V) to which a third-phase power supply is input. The sealant includes the flat portion of the crossover for the first phase (for example, the flat portion 36U1) and the flat portion of the crossover for the second phase (for example, the flat portion 36V1). The flat first temperature detecting element is sandwiched between the two, and between the flat portion of the crossing wire for the second phase and the flat portion (for example, the flat portion 36W1) of the crossing wire for the third phase. The flat portion of the crossover wire for the first phase, the first temperature detection element, the flat portion of the crossover wire for the second phase, and the second temperature are sandwiched between the two flat portions. It is a crossover unit characterized in that it is molded in a manner of sealing the flat portion of the detection element and the crossover for the third phase.

In the fourth aspect, the encapsulant has the first temperature detection element in good contact with the flat portion for the first phase and the flat portion for the second phase, and the second temperature detection element is flat for the second phase. Maintain a state in which the portion and the flat portion for the third phase are in good contact with each other. According to the fourth aspect, by maintaining the above-mentioned state, the temperature of each crossover can be detected accurately and stably over a long period of time.

[Fifth aspect]
A fifth aspect is a stator (for example, a stator 20) including a stator core, a winding wound around the stator core, and a crossover unit including a crossover and a temperature detection element, wherein the crossover unit is a first. The stator is a crossover unit according to any one of the first to fourth aspects.

According to the fifth aspect, the productivity of the stator can be increased by increasing the productivity of the crossover unit.

[Sixth aspect]
A sixth aspect is a rotor (for example, rotor 10) that rotates around a rotation axis (for example, rotation axis A), a shaft (for example, shaft 9) that penetrates the center of the rotor, and a circumferential direction around the rotation axis. A rotary machine (for example, a motor 1) including a stator that surrounds the rotor along the rotor, wherein the stator is the stator of the fifth aspect.

According to the sixth aspect, the productivity of the motor 1 can be increased by increasing the productivity of the stator.

1: Motor (rotator), 9: Shaft, 10: Rotor, 21a: Stator core, 20: Stator, 22: Coil (winding), 35: Crossover unit, 36U: Crossover wire (crossover wire for the first phase) ), 36V: Crossover (crossover for the second phase), 36W: Crossover (crossover for the third phase), 36U1: Flat part, 36V1: Flat part, 36W1: Flat part, 37: First temperature Detection element, 38: Second temperature detection element, 39: Molded resin (sealing body), A: Rotating axis

Claims (6)

A crossover wire in which a winding wound around a stator core is connected to one end in the length direction and power is input to the other end in the length direction.
A crossover unit including a temperature detecting element fixed to the crossover.
The crossover is composed of a round wire and has a flat flat portion in a part of the length direction.
A crossover unit characterized in that the temperature detecting element is fixed in a manner of directly contacting the flat portion. The crossover unit according to claim 1, wherein the temperature detecting element has a flat shape. The crossover unit according to claim 2, further comprising the temperature detecting element and a sealing body molded in a manner of sealing the flat portion. As the temperature detecting element, at least a first temperature detecting element and a second temperature detecting element are provided.
As the crossover, a crossover for the first phase to which the first phase power supply of the three-phase power supply is input, a crossover wire for the second phase to which the second phase power supply is input, and a third phase power supply are input. Equipped with a crossover for the third phase
The sealing body sandwiches the flat first temperature detecting element between the flat portion of the crossover for the first phase and the flat portion of the crossover for the second phase, and the second phase. The flat portion of the crossover for the first phase is sandwiched between the flat portion of the crossover for the third phase and the flat portion of the crossover for the third phase. , The flat portion of the first temperature detecting element, the crossover wire for the second phase, the second temperature detecting element, and the flat portion of the crossover wire for the third phase are sealed. The crossover unit according to claim 3, wherein the crossover unit is characterized. A stator including a stator core, a winding wound around the stator core, and a crossover unit including a crossover wire and a temperature detecting element.
A stator according to any one of claims 1 to 4, wherein the crossover unit is the crossover unit according to any one of claims 1 to 4. A rotary machine including a rotor that rotates around a rotation axis, a shaft that penetrates the center of the rotor, and a stator that surrounds the rotor along a circumferential direction centered on the rotation axis.
A rotating machine, wherein the stator is the stator according to claim 5.

Images