High speed motor structure

Abstract

The present invention provides a high-speed motor structure, wherein the stator includes a stator core arranged on the outer ring side of the rotor and a plurality of insulating support blocks arranged circumferentially on the outer ring side of the stator core, wherein the stator core is provided with a plurality of inner tooth slots circumferentially, wherein the number of the inner tooth slots is equal to the number of the insulating support blocks, and a plurality of outer tooth slots corresponding to the positions of the inner tooth slots are formed between the insulating support blocks, wherein each inner tooth slot is divided into two parts radially, and each outer tooth slot is divided into two parts circumferentially, wherein one inner tooth slot and one outer tooth slot are provided for an annular winding coil to be arranged around the stator yoke, and the other inner tooth slot and the other outer tooth slot are provided for another annular winding coil to be arranged around the stator yoke. The present invention can effectively reduce the total length of the winding and reduce the stator resistance value and copper loss by adopting a unique inner tooth slot and outer tooth slot structure, so that it is suitable for application in high-speed motors with short axial length and a small number of poles.

Description

Technical Field

[0001] The invention relates to the field of motors, in particular to a high-speed motor structure. Background Art

[0002] With the rapid development of engineering technology, motors are being used more and more widely. High-speed motors have good application prospects in centrifugal compressors, high-precision grinders, precision electronics industry, light industrial machinery, aerospace, etc. due to their advantages such as high speed, small size, high power density and fast response. They have become one of the research hotspots in the motor field.

[0003] However, compared with conventional motors, the high speed and high frequency of high-speed motors lead to increased eddy current losses in magnetic or conductive materials. The high power density of high-speed motors makes it difficult to dissipate heat from them, which can easily cause demagnetization of the rotor magnets. Therefore, reducing the losses of high-speed motors and improving their heat dissipation efficiency are extremely important for high-speed motors. Summary of the invention

[0004] In view of the problems of high loss, difficult heat dissipation and high temperature rise when high-speed motors are running, the present invention provides a high-speed motor structure, the purpose of which is to reduce motor loss, improve motor heat dissipation efficiency, and solve the shortcomings of the prior art.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A high-speed motor structure comprises a housing, a stator fixed inside the housing, and a rotor located at the center of the stator 7, with an air gap between the rotor and the stator, characterized in that:

[0007] The rotor has a cylindrical permanent magnet;

[0008] The stator includes a stator core arranged on the outer ring side of the rotor and a plurality of insulating support blocks arranged circumferentially on the outer ring side of the stator core. A plurality of internal tooth slots are formed circumferentially inside the stator core, the number of the internal tooth slots being equal to the number of the insulating support blocks, and a plurality of external tooth slots corresponding to the positions of the internal tooth slots are formed between the insulating support blocks. Each internal tooth slot is divided into two parts radially, and each external tooth slot is divided into two parts circumferentially, one of the internal tooth slots and one of the external tooth slots are provided for an annular winding coil arranged around the stator yoke, and the other of the internal tooth slots and the other of the external tooth slots are provided for another annular winding coil arranged around the stator yoke.

[0009] The high-speed motor structure, wherein: the end of the annular winding coil is encapsulated by a heat-conductive insulating material, and the heat-conductive insulating material is in heat-conductive contact with the casing.

[0010] The high-speed motor structure, wherein: the thermally conductive insulating material is a thermally conductive insulating epoxy resin.

[0011] The high-speed motor structure further comprises a magnetic shielding layer arranged between the plurality of insulating support blocks and the housing.

[0012] The high-speed motor structure, wherein: the rotor is composed of parallel magnetized cylindrical permanent magnets and a rotor sheath on the outside thereof.

[0013] The high-speed motor structure, wherein: the permanent magnet is a neodymium iron boron rare earth permanent magnet material.

[0014] The high-speed motor structure, wherein: it also includes a plurality of finger-pressure heat-conducting plates, which are radially arranged at both ends of the rotor, one end of each finger-pressure heat-conducting plate is inserted into the tooth portion on the outer ring side of the stator core, and the other end abuts against the inner side of the magnetic shielding layer.

[0015] The high-speed motor structure, wherein: one end of the finger-pressure heat-conducting plate inserted into the stator core is located between adjacent inner tooth slots.

[0016] The high-speed motor structure, wherein: the stator core and the magnetic shielding layer are made of silicon steel sheets, and the finger-pressure heat-conducting plate is made of a non-magnetic material with good thermal conductivity.

[0017] The present invention adopts a unique inner tooth slot and outer tooth slot structure, which can effectively reduce the total length of the winding and reduce the stator resistance and copper loss, so that it is suitable for application in high-speed motors with a short axial length and a small number of poles; the present invention also reduces the eddy current loss in the aluminum casing through a magnetic shielding layer, and improves the heat dissipation efficiency through a finger pressure heat conductive plate, so that the present invention has the advantages of low eddy current loss, large heat dissipation area and high heat dissipation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the radial structure of the motor of the present invention;

[0019] Figure 2 It is a schematic diagram of the axial structure of the motor of the present invention.

[0020] Figure 3 It is a schematic diagram of the structure of the motor finger-pressure heat-conducting plate of the present invention.

[0021] Explanation of the accompanying drawings: 1-permanent magnet; 2-rotor sleeve; 3-housing; 4-magnetic shielding layer; 5-insulating support block; 6-stator core; 7-stator; 8-annular winding coil; 9-rotor; 10-thermal conductive insulating material; 11-finger pressure heat conductive plate; A, B, C-incoming terminal of the three-phase circuit of the motor; X, Y, Z-outgoing terminal of the three-phase circuit of the motor. DETAILED DESCRIPTION

[0022] like Figure 1 , Figure 2As shown, the present invention provides a high-speed motor structure, comprising an aluminum housing 3, a stator 7 fixed to the inner side of the housing 3, and a rotor located at the center of the stator 7, with an air gap of a certain thickness between the rotor and the stator 7, wherein:

[0023] The rotor is composed of a parallel magnetized cylindrical permanent magnet 1 and a rotor sheath 2 outside thereof;

[0024] The stator 7 includes a stator core 6 arranged on the outer ring side of the rotor and a plurality of (e.g., 12, 18 or 24) insulating support blocks 5 arranged circumferentially on the outer ring side of the stator core 6. A plurality of inner tooth slots (the number of which is equal to the number of insulating support blocks 5) are formed circumferentially inside the stator core 6, and a plurality of outer tooth slots corresponding to the positions of the plurality of inner tooth slots are formed between the plurality of insulating support blocks 5. Each inner tooth slot is divided into two parts along the radial direction, and each outer tooth slot is divided into two parts along the circumferential direction. One of the inner tooth slots and one of the outer tooth slots are provided for an annular winding coil 8 to be arranged around the stator yoke, and the other inner tooth slot and the other outer tooth slot are provided for another annular winding coil 8 to be arranged around the stator yoke (in the figure, A, B, and C respectively represent the incoming end of the three-phase circuit of the motor, and X, Y, and Z respectively represent the outgoing end of the three-phase circuit of the motor); the end of the annular winding coil 8 is encapsulated by a thermally conductive insulating material 10, and the thermally conductive insulating material 10 is in thermal contact with the housing 3;

[0025] A magnetic shielding layer 4 is arranged between the plurality of insulating support blocks 5 and the housing 3 to reduce eddy current losses in the housing 3;

[0026] A plurality of finger-pressure heat-conducting plates 11, such as Figure 3 As shown, they are radially arranged at both ends of the rotor, one end of each finger pressure heat conductive plate 11 is inserted into the tooth portion on the outer ring side of the stator core 6, and the other end is abutted against the inner side of the magnetic shielding layer 4; one end of the finger pressure heat conductive plate 11 inserted into the stator core 6 is located between adjacent inner tooth slots, which can quickly conduct the heat generated in the annular winding coil 8 and dissipate the heat to the outside through the magnetic shielding layer 4 and the casing 3.

[0027] In a preferred embodiment, the permanent magnet 1 is a neodymium iron boron rare earth permanent magnet material, the rotor sleeve 2 is a high mechanical strength GH4169 nickel-based alloy, the stator core 6 and the magnetic shielding layer 4 are silicon steel sheets, the annular winding coil 8 is a copper wire, and the insulating support block 5 is an insulating pad with high thermal conductivity and high mechanical strength and a glass fiber reinforcement layer (GTR, GHR, GSR), the casing 3 is an aluminum alloy with good thermal conductivity and high mechanical strength, the finger pressure heat conductive plate 11 is a non-magnetic and thermally conductive material such as aluminum and copper, and the thermally conductive insulating material 10 is a thermally conductive insulating epoxy resin.

[0028] The present invention adopts a unique inner tooth slot and outer tooth slot structure, which can effectively reduce the total length of the winding and reduce the stator resistance and copper loss, so that it is suitable for application in high-speed motors with a short axial length and a small number of poles; the present invention also reduces the eddy current loss in the aluminum casing through a magnetic shielding layer, and improves the heat dissipation efficiency through a finger pressure heat conductive plate, so that the present invention has the advantages of low eddy current loss, large heat dissipation area and high heat dissipation efficiency.

[0029] The above description is only illustrative rather than restrictive of the present invention. Those skilled in the art will understand that many modifications, changes or equivalents may be made without departing from the spirit and scope defined by the claims, but all will fall within the scope of protection of the present invention.

Claims

1. A high-speed motor structure, comprising a housing, a stator fixed inside the housing, and a rotor located at the center of the stator, with an air gap between the rotor and the stator, characterized in that: The rotor has a cylindrical permanent magnet, and the permanent magnet is a neodymium iron boron rare earth permanent magnet material; The stator includes a stator core arranged on the outer ring side of the rotor and a plurality of insulating support blocks arranged circumferentially on the outer ring side of the stator core. A plurality of inner tooth slots are formed circumferentially inside the stator core, the number of the inner tooth slots being equal to the number of the insulating support blocks, and a plurality of outer tooth slots corresponding to the positions of the inner tooth slots are formed between the insulating support blocks. Each inner tooth slot is divided into two parts radially, and each outer tooth slot is divided into two parts circumferentially, one inner tooth slot and one outer tooth slot are provided for an annular winding coil to be arranged around the stator yoke, and the other inner tooth slot and the other outer tooth slot are provided for another annular winding coil to be arranged around the stator yoke; the end of the annular winding coil is encapsulated by a thermally conductive insulating material, and the thermally conductive insulating material is in thermally conductive contact with the casing.

2. The high-speed motor structure according to claim 1, characterized in that: The thermally conductive insulating material is a thermally conductive insulating epoxy resin.

3. The high-speed motor structure according to claim 1, characterized in that: Also included is a magnetic shielding layer, which is arranged between the plurality of insulating support blocks and the housing.

4. The high-speed motor structure according to claim 1, characterized in that: The rotor is composed of parallel magnetized cylindrical permanent magnets and a rotor sleeve on the outer side thereof.

5. The high-speed motor structure according to claim 3, characterized in that: It also includes a plurality of finger-pressure heat-conducting plates, which are radially arranged at both ends of the rotor, one end of each finger-pressure heat-conducting plate is inserted into the tooth portion on the outer ring side of the stator core, and the other end abuts against the inner side of the magnetic shielding layer.

6. The high-speed motor structure according to claim 5, characterized in that: One end of the finger-pressure heat-conducting plate inserted into the stator core is located between adjacent inner tooth slots.

7. The high-speed motor structure according to claim 6, characterized in that: The stator core and the magnetic shielding layer are made of silicon steel sheets, and the finger-pressure heat-conducting plate is made of a non-magnetic material with good thermal conductivity.

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