Self-starting permanent magnet motor for washing machine

Abstract

The motor comprises a rotor, the rotor comprises a rotating shaft, a permanent magnet cage, an air guide structure and a bearing, the rotating shaft is arranged on the axis of the motor, the rotating shaft is axially connected with the permanent magnet cage and the bearing, the permanent magnet cage comprises an end plate, a permanent magnet rod body, a fixing piece and a magnetic isolation body, and the permanent magnet rod body is arranged on the end plate. The end plates are end structures of permanent magnet cages and are axially fixed on the rotating shaft, a plurality of permanent magnet rod bodies are connected between the end plates, the permanent magnet rod bodies are fixed on the end plates through fixing pieces, the permanent magnet rod bodies are circumferentially distributed at the edges of the end plates, the permanent magnet rod bodies are obliquely arranged relative to the axis, and all the permanent magnet rod bodies are arranged in parallel; and the rotating shaft between the end plates is also sleeved with a magnet isolator. Directional arrangement of the magnetic pole direction is realized by arranging a plurality of regularly arranged permanent magnet rod bodies, so that self-starting is realized, and the load is reduced.

Description

Technical Field

[0001] The utility model relates to a structural improvement of a motor, in particular to a self-starting permanent magnet motor for a washing machine. Background Art

[0002] The motor used in a washing machine is a power output device that drives the impeller drum of the washing machine. With the improvement of living standards, the noise requirements for washing machines are also increased. Therefore, permanent magnet motors are gradually used in washing machines. Permanent magnet motors have low working noise and can directly output power, reducing the transmission structure. Since the washing machine drum contains foreign matter and water, the starting pressure of the motor is high. At startup, a larger current is required, which puts great pressure on the circuit structure, is prone to heat, and long-term work affects its life. Therefore, it is necessary to improve the structure of the motor to reduce the starting pressure. Utility Model Content

[0003] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art and to provide a self-starting permanent magnet motor for a washing machine.

[0004] The technical solution adopted by the utility model to solve the above problems is: the motor includes a rotor, the rotor includes a rotating shaft, a permanent magnet cage, an air guide structure and a bearing, the rotating shaft is arranged on the axis of the motor, the permanent magnet cage and the bearing are axially connected on the rotating shaft, the permanent magnet cage includes an end plate, a permanent magnet rod body, a fixing piece and a magnetic isolation body, the end plate is the end structure of the permanent magnet cage and is axially fixed on the rotating shaft, a plurality of permanent magnet rod bodies are connected between the end plates, the permanent magnet rod bodies are fixed on the end plates by fixing pieces, the permanent magnet rod bodies are circumferentially distributed at the edges of the end plates, the permanent magnet rod bodies are arranged obliquely relative to the axis, all the permanent magnet rod bodies are arranged in parallel, and a magnetic isolation body is also sleeved on the rotating shaft between the end plates. The directional arrangement of the magnetic pole direction is achieved by setting up multiple permanent magnet bars with a regular arrangement, and because of the skewed setting, the magnetic induction direction between it and the stator coil is also inclined to the axial direction, so it has a driving force to drive the rotor to rotate and gradually increase the speed, realizing self-starting. During the starting process, the speed can be gradually increased in conjunction with current control, realizing the requirement of reducing the load on the circuit. The cutting magnet can block the magnetism of the permanent magnet bar from being transmitted to the opposite side of the axial direction, reducing interference and achieving normal and efficient operation.

[0005] Furthermore, the permanent magnet rod body is a magnet material of neodymium iron boron material, and its end surface is flush with the end plate surface, and the fixing piece passes through the end plate to fix the permanent magnet rod body. The permanent magnet material used has stable magnetic properties, and it is connected to the end plate through the fixing piece to form a stable connection structure, which is balanced on the circumference, has good dynamic balance, and has small working vibration.

[0006] Furthermore, the wind guide structure is fixed on the outer end surface of the end plate, and the wind guide structure includes a plurality of wind guide blades, which are fixedly arranged on the surface of the end plate and are distributed around the axis. The function of the wind guide blades is to form flowing air at the end of the rotor, improve the air flow efficiency inside the motor, and increase the heat dissipation effect.

[0007] Furthermore, the rotating shaft is connected to the motor housing through a bearing, and the rotating shaft rotates with the bearing. A positioning snap ring is arranged near the bearing to fix the relative position of the bearing on the rotating shaft. The bearing is fixed in position by the positioning snap ring to prevent the rotating shaft from axial movement.

[0008] Furthermore, the permanent magnet cage is embedded with silicon steel sheets, which are stacked and provided with grooves for accommodating the permanent magnet rods, and the permanent magnet rods are fixed in the grooves. The silicon steel sheets have good magnetic conductivity and have a good fixing effect on the permanent magnet rods, forming a good integrated structure for the rotor as a whole.

[0009] Compared with the prior art, the utility model has the following advantages and effects: the design is a structural improvement of a washing machine motor, mainly improving the permanent magnet structure of the rotor. The structure is easy to assemble, has good integrity, has low vibration during operation, can effectively achieve self-starting, reduces circuit load, and prolongs the working life. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the lateral structure of the rotor.

[0011] Figure 2 It is a schematic diagram of the cross-sectional structure of the rotor.

[0012] Figure 3 It is a schematic diagram of the end face structure of the rotor.

[0013] In the figure: 1. rotor, 2. rotating shaft, 3. permanent magnet cage, 4. air guide structure, 5. bearing, 6. end plate, 7. permanent magnet rod, 8. fixing part, 9. magnetic separator, 10. air guide plate, 11. positioning clamp ring, 12. silicon steel sheet. DETAILED DESCRIPTION

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.

[0015] A self-starting permanent magnet motor for a washing machine, the motor comprises a rotor 1, the rotor 1 comprises a rotating shaft 2, a permanent magnet cage 3, an air guide structure 4 and a bearing 5, the rotating shaft 2 is arranged on the axis of the motor, the permanent magnet cage 3 and the bearing 5 are axially connected to the rotating shaft 2, the permanent magnet cage 3 comprises an end plate 6, a permanent magnet rod body 7, a fixing piece 8 and a magnetic isolation body 9, the end plate 6 is the end structure of the permanent magnet cage 3 and is axially fixed on the rotating shaft 2, a plurality of permanent magnet rod bodies 7 are connected between the end plates 6, the permanent magnet rod bodies 7 are fixed on the end plates 6 by the fixing piece 8, the permanent magnet rod bodies 7 are circumferentially distributed at the edge of the end plates 6, the permanent magnet rod bodies 7 are arranged obliquely relative to the axis, all the permanent magnet rod bodies 7 are arranged in parallel, and a magnetic isolation body 9 is also sleeved on the rotating shaft 2 between the end plates 6.

[0016] The permanent magnet bar body 7 is made of NdFeB magnet material, and its end surface is flush with the surface of the end plate 6 . The fixing piece 8 passes through the end plate 6 to fix the permanent magnet bar body 7 .

[0017] The air guide structure 4 is fixed on the outer end surface of the end plate 6. The air guide structure 4 includes a plurality of air guide blades 10. The air guide blades 10 are protruding from the surface of the end plate 6 and are fixedly arranged. The air guide blades 10 are distributed in a circle with the axis as the center.

[0018] The rotating shaft 2 is connected to the motor housing via a bearing 5 , and the rotating shaft 2 rotates with the bearing 5 . A positioning snap ring 11 is provided near the bearing 5 , and the positioning snap ring 11 fixes the relative position of the bearing 5 on the rotating shaft 2 .

[0019] The permanent magnet cage is embedded with silicon steel sheets 12, which are stacked and have grooves for accommodating the permanent magnet rods 7. The permanent magnet rods 7 are fixed in the grooves.

[0020] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary rather than restrictive. The scope of the present invention is defined by the claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim involved.

[0021] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A self-starting permanent magnet motor for a washing machine, characterized in that: The motor comprises a rotor (1), the rotor (1) comprising a rotating shaft (2), a permanent magnet cage (3), an air guide structure (4) and a bearing (5), the rotating shaft (2) being arranged on the axis of the motor, the permanent magnet cage (3) and the bearing (5) being axially connected on the rotating shaft (2), the permanent magnet cage (3) comprising an end plate (6), a permanent magnet rod body (7), a fixing piece (8) and a magnetic isolation body (9), the end plate (6) being the end structure of the permanent magnet cage (3) and being axially fixed on the rotating shaft (2), a plurality of permanent magnet rod bodies (7) being connected between the end plates (6), the permanent magnet rod bodies (7) being fixed on the end plates (6) through the fixing piece (8), the permanent magnet rod bodies (7) being circumferentially distributed at the edge of the end plates (6), the permanent magnet rod bodies (7) being arranged obliquely relative to the axis, all the permanent magnet rod bodies (7) being arranged in parallel, and a magnetic isolation body (9) being sleeved on the rotating shaft (2) between the end plates (6).

2. The self-starting permanent magnet motor for a washing machine according to claim 1, characterized in that: The permanent magnet bar body (7) is made of a magnet material of neodymium iron boron, and its end surface is flush with the surface of the end plate (6). The fixing piece (8) passes through the end plate (6) to fix the permanent magnet bar body (7).

3. The self-starting permanent magnet motor for a washing machine according to claim 1, characterized in that: The wind guide structure (4) is fixed on the outer end surface of the end plate (6), and the wind guide structure (4) includes a plurality of wind guide plates (10). The wind guide plates (10) are protruding from the surface of the end plate (6) and are fixedly arranged. The wind guide plates (10) are distributed in a circle with the axis as the center.

4. The self-starting permanent magnet motor for a washing machine according to claim 1, characterized in that: The rotating shaft (2) is connected to the motor housing via a bearing (5), and the rotating shaft (2) rotates along with the bearing (5). A positioning snap ring (11) is provided adjacent to the bearing (5), and the positioning snap ring (11) fixes the relative position of the bearing (5) on the rotating shaft (2).

5. The self-starting permanent magnet motor for a washing machine according to claim 1, characterized in that: A silicon steel sheet (12) is embedded in the permanent magnet cage. The silicon steel sheet (12) is stacked and provided with a groove for accommodating the permanent magnet rod body (7). The permanent magnet rod body (7) is fixed in the groove.

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