Structure for increasing end inductance of motor

Abstract

The utility model provides a structure for increasing end inductance of a motor, which belongs to the technical field of motors and comprises a frame-shaped magnetic conductive block, a through hole is arranged at the center of the magnetic conductive block, the magnetic conductive block comprises a first magnetizer and a second magnetizer which are spliced in a matched manner, and the magnetic conductive block is mounted on a stator slot of a motor stator core. The through hole of the magnetic conductive block is communicated with the stator slot, the winding passes through the through hole of the magnetic conductive block, and in-slot insulation paper is arranged between the magnetic conductive block and the winding. According to the utility model, the influence on a main magnetic circuit is small, under the condition that the original main inductance of the motor is not increased, the inductance of the whole motor is improved by increasing the inductance of the end part through the magnetic conductive blocks, and the increase of the inductance of the motor can reduce the harmonic current caused by a controller, thereby reducing the harmonic loss of the motor, reducing the heating value of the motor and improving the performance of the motor.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and in particular relates to a structure for increasing the inductance of motor ends. Background Art

[0002] In recent years, with the increase in motor power density (the ratio of the maximum power of a motor to its mass or volume), the speed of the motor has become higher and higher, and the power has become greater and greater. High power and high speed will cause the motor inductance to be too small. Too small inductance will cause the harmonic current of the controller to increase, causing additional harmonic losses, resulting in increased motor losses, motor overheating, and performance deterioration.

[0003] Therefore, it is very necessary to develop a structure that increases the inductance of the motor ends and improve the inductance of the motor to reduce the additional loss caused by the harmonic current of the controller. Utility Model Content

[0004] The problem to be solved by the utility model is to provide a structure for increasing the inductance of the motor end.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a structure for increasing the end inductance of the motor, including a magnetic conductive block, the magnetic conductive block is a frame-shaped structure, a through hole is provided in the center of the magnetic conductive block, the magnetic conductive block includes a first magnetic conductive body and a second magnetic conductive body that are spliced ​​together, the magnetic conductive block is installed on the stator slot of the stator core of the motor, the through hole of the magnetic conductive block is connected to the stator slot, the winding is arranged through the through hole of the magnetic conductive block, and an in-slot insulating paper is provided between the magnetic conductive block and the winding.

[0006] Furthermore, the insulating paper in the slot is coated on the inner wall of the through hole of the magnetic conductive block.

[0007] Furthermore, the splicing end of the first magnetic conductor is provided with a first protrusion and a first slot, and the splicing end of the second magnetic conductor is provided with a second protrusion and a second slot. The first protrusion and the second slot cooperate with each other, and the second protrusion and the first slot cooperate with each other to realize the splicing of the first magnetic conductor and the second magnetic conductor.

[0008] After the first magnetic conductor and the second magnetic conductor are spliced ​​together, the magnetic conductor block can surround the winding in a stator slot.

[0009] Due to the adoption of the above technical solution, the utility model has the following beneficial effects:

[0010] (1) The utility model has little impact on the main magnetic circuit. Without increasing the original main inductance of the motor, the end inductance is increased by the magnetic block to improve the inductance of the entire motor. The increase in the motor inductance will reduce the harmonic current caused by the controller, thereby reducing the harmonic loss of the motor, reducing the heat generated by the motor, and improving the performance of the motor.

[0011] (2) The winding at the end is originally an ineffective part in the motor and only serves to connect the windings in the slots. Without adding other coils, the utility model fully utilizes the winding of the ineffective part.

[0012] (3) The utility model rationally utilizes the space inside the motor. The magnetic block is only installed at the winding at the end, which does not lead to an additional increase in the volume of the motor. The inductance of the motor is increased without increasing the volume of the motor.

[0013] (4) The magnetic conductive blocks of the present invention can be installed freely, and different numbers of magnetic conductive blocks can be installed according to different requirements for increasing the end inductance.

[0014] (5) Since the thermal conductivity of the magnetic block is much higher than that of air, the magnetic block of the present invention can enhance the heat dissipation effect of the end winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be described in detail below with reference to the accompanying drawings and in combination with examples. The advantages and implementation methods of the present invention will become more apparent. The contents shown in the accompanying drawings are only used to illustrate the present invention and do not constitute any limitation to the present invention. In the accompanying drawings:

[0016] Figure 1 It is a structural diagram of the present utility model.

[0017] Figure 2 It is a structural schematic diagram of the first magnetic conductor of the utility model.

[0018] Figure 3 It is a structural schematic diagram of the second magnetic conductor of the utility model.

[0019] Figure 4 It is a schematic diagram of the magnetic circuit formed by the magnetic conductive block of the utility model.

[0020] In the picture:

[0021] 1. Winding; 2. Motor stator core; 3. Insulation paper in the slot; 4. Magnetic block; 5. Stator slot; 41. First magnetic conductor; 42. Second magnetic conductor; 411. First protrusion; 412. First slot; 421. Second protrusion; 422. Second slot. DETAILED DESCRIPTION

[0022] like Figures 1 to 3As shown, the utility model provides a structure for increasing the inductance of the motor end, including a magnetic block 4, which is a rectangular frame structure. A rectangular through hole is provided in the center of the magnetic block 4, and the magnetic block 4 includes a first magnetic conductor 41 and a second magnetic conductor 42 that are spliced ​​together. The splicing end of the first magnetic conductor 41 is provided with a first protrusion 411 and a first slot 412, and the splicing end of the second magnetic conductor 42 is provided with a second protrusion 421 and a second slot 422. The first protrusion 411 and the second slot 422 cooperate with each other, and the second protrusion 421 and the first slot 412 cooperate with each other to realize the splicing of the first magnetic conductor 41 and the second magnetic conductor 42.

[0023] The magnetic block 4 is fixed to the stator slot 5 of the motor's stator core 2. The through hole of the magnetic block 4 is connected to the stator slot 5 and is coaxially arranged. In this embodiment, the through hole of the magnetic block 4 is consistent in size and shape with the stator slot 5. After the first magnetic conductor 41 and the second magnetic conductor 42 are spliced ​​together, the magnetic block 4 can enclose the winding in a stator slot 5.

[0024] A single winding 1 is arranged through the through hole of the magnetic conductive block 4 , and an in-slot insulating paper 3 is arranged between the magnetic conductive block 4 and the winding. The in-slot insulating paper 3 is coated on the inner wall of the through hole of the magnetic conductive block 4 .

[0025] Working process:

[0026] When the end inductance of the motor needs to be increased, a magnetic conductive block 4 is installed on each stator slot 5 of the motor stator core. During installation, the first magnetic conductive body 41 and the second magnetic conductive body 42 are spliced ​​on the outside of the winding 1, and the winding 1 passes through the through hole formed in the middle of the magnetic conductive block 4. In this way, a magnetic field will be formed in the magnetic conductive block 4 surrounding the outside of the winding 1, as shown in FIG. Figure 4 As shown, since the entire magnetic conductive block 4 forms a completely closed magnetic circuit, it short-circuits the magnetic field generated by the winding 1 at the corresponding end. That is, most of the magnetic field of the winding 1 at the corresponding end passes through the corresponding magnetic conductive block 4. The magnetic field in the magnetic conductive block 4 increases the magnetic field strength at the end of the winding 1, that is, increases the end inductance of the winding 1. The first magnetic conductive body 41 and the second magnetic conductive body 42 are made of laminated silicon steel sheets, which can reduce the eddy current loss generated by the magnetic field.

[0027] In addition, the spliced ​​magnetic conductive blocks 4 can be installed as needed, and when there is no need to increase the end inductance, the magnetic conductive blocks 4 can be removed.

[0028] The above embodiments of the present invention are described in detail, but the above contents are only preferred embodiments of the present invention and should not be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A structure for increasing the inductance of a motor end, characterized by: It includes a magnetic conductive block, which is a frame-shaped structure. A through hole is provided in the center of the magnetic conductive block. The magnetic conductive block includes a first magnetic conductive body and a second magnetic conductive body that are spliced ​​together. The magnetic conductive block is installed on the stator slot of the motor stator core. The through hole of the magnetic conductive block is connected to the stator slot. The winding is arranged through the through hole of the magnetic conductive block. In-slot insulating paper is provided between the magnetic conductive block and the winding.

2. The structure for increasing the end inductance of a motor according to claim 1, characterized in that: The insulating paper in the slot is coated on the inner wall of the through hole of the magnetic conductive block.

3. The structure for increasing the end inductance of a motor according to claim 1, characterized in that: The splicing end of the first magnetic conductor is provided with a first protrusion and a first slot, and the splicing end of the second magnetic conductor is provided with a second protrusion and a second slot. The first protrusion and the second slot cooperate with each other, and the second protrusion and the first slot cooperate with each other to realize the splicing of the first magnetic conductor and the second magnetic conductor.

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