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motor

A technology of motors and coils, applied in the direction of winding insulation materials, etc., can solve problems such as partial discharge and reduction of motor insulation performance, and achieve the effect of sharing voltage reduction

Active Publication Date: 2020-08-28
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If such a surge voltage is applied to the motor, partial discharge occurs, and there is a problem that the insulation performance of the motor decreases

Method used

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Embodiment approach 1

[0027] figure 1 It is a schematic diagram of the motor concerning Embodiment 1 for carrying out this invention. exist figure 1 Among them, the motor 1 includes a rotor 2 and a stator 3 . The stator 3 includes a cylindrical core 4 , teeth 5 protruding from the core 4 to the inner peripheral side, and hollow molded coils 6 inserted into the teeth 5 . The motor 1 in this embodiment is a Y-connected concentrated winding motor with three phases and four coils connected in series. The coils on the power supply side are U1, V1, and W1, and the coils on the neutral point side are U2, V2, and W2, U3, V3, and W3, and U4, V4, and W4. Hereinafter, the power supply side coil is referred to as the first coil 7 , and the neutral point side is referred to as the second coil 8 , the third coil 9 , and the fourth coil 10 . These coils are all constituted by molded coils 6 .

[0028] figure 2 It is an equivalent circuit diagram of the motor 1 of this embodiment. exist figure 2 In , t...

Embodiment approach 2

[0046] Figure 7 It is a cross-sectional view of a molded coil according to Embodiment 2 for carrying out the present invention. The structure of the motor in this embodiment is the same as that of Embodiment 1. figure 1 The construction of the motor shown in is the same. exist Figure 7 middle, Figure 7 (a) is a cross-sectional view of the molded coil of the coil on the power feeding part side, Figure 7 (b) is a cross-sectional view of a molded coil of a coil located at a position other than the power feeding part side. Will Figure 7 The dielectric constant of the molding material of the first coil disposed on the feeding part side shown in (a) is ε 1 ,Will Figure 7 The dielectric constant of the molding material of the other coils shown in (b), that is, the second coil, the third coil, and the fourth coil is set to ε 2 . In the motor of this embodiment, so that ε 1 greater than ε 2 The way to select the molding material.

[0047] and, will Figure 7 The thi...

Embodiment approach 3

[0050] Figure 8 It is a schematic diagram of the motor concerning Embodiment 3 for carrying out this invention. The motor 1 in the present embodiment is a Y-connected concentrated winding motor with three phases and four coils connected in series, as in the first embodiment. The coils on the feeder side of each phase are U1, V1, and W1, and the coils on the neutral point side are U2, V2, and W2, U3, V3, and W3, and U4, V4, and W4.

[0051] In this embodiment, the first coil 7 ( U1 , V1 , and W1 ) serving as the power feeding part side coil is composed of the molded coil 6 molded from a molding material similarly to the first embodiment, and the other second coils Coil 8 (coils U2 , V2 , and W2 ), third coil 9 ( U3 , V3 , and W3 ), and fourth coil 10 ( U4 , V4 , and W4 ) are constituted only by winding 13 . That is, with respect to the coils other than the coils located on the power feeding part side, the surroundings of the windings are air with a dielectric constant of 1. ...

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Abstract

The invention provides a motor. The purpose is to reduce sharing voltage of a power supply unit side coil without reducing a space factor of the power supply unit side coil. The motor (1) has a plurality of coils including windings (13) wound around teeth (5), and windings (13) of the power supply unit side coil are molded by a molding material (14), a dielectric constant of the molding material (14) which is used to molded the winding (13) of the power supply unit side coil being higher than the dielectric constant of the periphery of the winding (13) of a coil located outside the power supply unit side.

Description

technical field [0001] The present invention relates to an inverter-driven motor used in electric motors of electric vehicles and hybrid vehicles, hoists of elevators, and the like. Background technique [0002] Inverter-driven motors characterized by high efficiency are widely used along with energy saving. In a motor driven by an inverter, a steep surge voltage may be superimposed on the pulse voltage output from the inverter. Here, the surge voltage refers to a high voltage generated momentarily exceeding a steady state. When such a surge voltage is applied to the motor, partial discharge is generated, and there is a problem that the insulation performance of the motor is lowered. [0003] The steeply rising surge voltage is not equally shared among the coils constituting the motor, but 80% of the surge voltage is concentratedly applied to the coils on the power supply unit side. Therefore, a method has been disclosed in which, in order to increase the withstand voltag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K3/30
CPCH02K3/30
Inventor 开田健冈田真一
Owner MITSUBISHI ELECTRIC CORP
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