Rotor assembly of self-starting permanent magnet synchronous motor

Abstract

A rotor assembly of a self-starting permanent magnet synchronous motor, comprising a transmission shaft (1) and rotor laminations (2). A plurality of rotor laminations (2) are provided and are sequentially stacked; a plurality of cast aluminum bar slots (3) are formed in the outer periphery of each rotor lamination (2) along the trajectory of the rotor lamination (2); a shaft hole (4) is formed in the center of the rotor lamination (2), and a plurality of magnetic steel groove units are formed in the rotor lamination (2) and between the shaft hole (4) and the cast aluminum bar slots (3); the plurality of magnetic steel groove units are distributed around the shaft hole (4); each magnetic steel groove unit is composed of a plurality of magnetic steel single grooves (5); adjacent magnetic steel single grooves (5) are spaced apart and are not communicated with each other; and a steel magnet is provided in each magnetic steel single groove (5).

Description

A self-starting permanent magnet synchronous motor rotor assembly Technical Field

[0001] The utility model belongs to the technical field of motors and relates to a permanent magnet synchronous motor, in particular to a self-starting permanent magnet synchronous motor rotor assembly. Background Art

[0002] The starting and operation of the permanent magnet synchronous motor are formed by the interaction of the magnetic fields generated by the stator winding, rotor cage winding and permanent magnets.

[0003] As we all know, when a permanent magnet synchronous motor is stationary, an external current needs to be passed into the stator winding to generate a stator rotating magnetic field. The stator rotating magnetic field rotates relative to the rotor, generating current in the cage winding, forming a rotor rotating magnetic field. The asynchronous torque generated by the interaction between the stator rotating magnetic field and the rotor rotating magnetic field causes the rotor to accelerate from a standstill.

[0004] From the above, we know that the permanent magnet synchronous motor requires an external current control system to start working, and the startup is also relatively slow, which affects the working efficiency of the motor. Summary of the Invention

[0005] The purpose of this utility model is to address the above-mentioned problems existing in the prior art and provide a self-starting permanent magnet synchronous motor rotor assembly. By improving the rotor plate structure in the rotor assembly, the permanent magnet synchronous motor can achieve high efficiency, low cost, low voltage starting and fast starting speed.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a self-starting permanent magnet synchronous motor rotor assembly, which includes a transmission shaft and a rotor plate, characterized in that the rotor plates are in a plurality and are stacked in sequence, the outer periphery of the rotor plate is provided with a plurality of cast aluminum guide bar grooves along its trajectory, the middle part of the rotor plate is provided with an axial hole, and the rotor plate is provided with a plurality of groups of magnetic steel slot units between the axial hole and the cast aluminum guide bar groove, the plurality of groups of magnetic steel slot units are distributed circumferentially around the axial hole, each of the magnetic steel slot units is composed of a plurality of magnetic steel single slots, adjacent magnetic steel single slots are provided at intervals and are not connected to each other, and each magnetic steel single slot is provided with a magnetic steel.

[0007] In the above-mentioned self-starting permanent magnet synchronous motor rotor assembly, a plurality of fixing holes are provided between the shaft hole and the magnetic steel slot unit.

[0008] In the above-mentioned self-starting permanent magnet synchronous motor rotor assembly, each group of the magnetic steel slot units has two single magnetic steel slots, and the two single magnetic steel slots are located on the same horizontal line.

[0009] In the above-mentioned self-starting permanent magnet synchronous motor rotor assembly, an end edge reinforcement groove is extended from the outer end of the magnetic steel single slot, and the end edge reinforcement groove is inclined relative to the magnetic steel single slot.

[0010] Compared with the existing technology, the self-starting permanent magnet synchronous motor rotor assembly has the following advantages:

[0011] 1. Save costs, no need to set up an external current control system, and realize the self-starting of the motor;

[0012] 2. The motor has high starting efficiency and fast starting, and can achieve low voltage starting. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG1 is a schematic diagram of the structure of a rotor plate.

[0014] FIG2 is a schematic structural diagram of the rotor assembly of the self-starting permanent magnet synchronous motor.

[0015] In the figure, 1. transmission shaft; 2. rotor plate; 3. cast aluminum guide bar groove; 4. shaft hole; 5. single magnetic steel slot; 6. fixing hole; 7. end edge reinforcement groove. Implementation Method

[0016] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0017] As shown in Figures 1 and 2, the self-starting permanent magnet synchronous motor rotor assembly includes a transmission shaft 1 and rotor plates 2. The rotor plates 2 are in a plurality and are stacked in sequence. A plurality of cast aluminum guide bar slots 3 are provided along the outer periphery of the rotor plates 2 along their tracks. An axial hole 4 is provided in the middle of the rotor plates 2. The rotor plates 2 are provided with a plurality of groups of magnetic steel slot units between the axial hole 4 and the cast aluminum guide bar slots 3. The plurality of groups of magnetic steel slot units are circumferentially distributed around the axial hole 4. Each magnetic steel slot unit is composed of a plurality of magnetic steel single slots 5. Adjacent magnetic steel single slots 5 are spaced apart and not connected to each other. A magnetic steel is provided in each magnetic steel single slot 5.

[0018] To be more specific, a plurality of fixing holes 6 are provided between the shaft hole 4 and the magnetic steel slot unit. The fixing holes 6 are distributed circumferentially, and fixing members are provided in the fixing holes 6 , and baffles for positioning the magnetic steel are connected through the fixing members.

[0019] In this embodiment, each group of magnetic steel slot units includes two single magnetic steel slots 5 , and the two single magnetic steel slots 5 are located on the same horizontal line.

[0020] In order to improve the performance of the motor, an end edge reinforcement groove 7 is extended from the outer end of the magnetic steel single slot 5, and the end edge reinforcement groove 7 is inclined relative to the magnetic steel single slot 5.

[0021] Compared with the permanent magnet synchronous motors currently on the market, the permanent magnet synchronous motor with the present rotor assembly has the following advantages: (1) the self-starting effect of the motor is achieved by adopting the cast aluminum winding rotor sheet 2, which can eliminate the need for an external control system and save costs; (2) the segmented arrangement of the magnetic steel single slot 5 reduces the cost of the large volume of magnetic steel brought about by the integrated magnetic steel slot, thereby improving the starting efficiency of the motor and enabling low-voltage starting.

[0022] Specifically, in this example, the self-starting permanent magnet synchronous motor with the rotor assembly is mainly used in the field of aerators.

[0023] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0024] Although this document frequently uses terms such as transmission shaft 1, rotor plate 2, cast aluminum guide slot 3, shaft hole 4, magnetic steel single slot 5, fixing hole 6, and end edge reinforcement slot 7, the use of other terms is not excluded. These terms are used solely to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A self-starting permanent magnet synchronous motor rotor assembly, the rotor assembly comprising a transmission shaft (1) and a rotor sheet (2), characterized in that: The rotor sheets (2) are provided in a plurality of layers in sequence, the outer periphery of the rotor sheets (2) is provided with a plurality of cast aluminum guide grooves (3) along its trajectory, the middle part of the rotor sheets (2) is provided with an axial hole (4), and the rotor sheets (2) are provided with a plurality of groups of magnetic steel groove units between the axial hole (4) and the cast aluminum guide grooves (3), the plurality of groups of magnetic steel groove units are circumferentially distributed around the axial hole (4), each of the magnetic steel groove units is composed of a plurality of magnetic steel single grooves (5), adjacent magnetic steel single grooves (5) are provided at intervals and are not connected to each other, and each magnetic steel single groove (5) is provided with a magnetic steel.

2. A self-starting permanent magnet synchronous motor rotor assembly according to claim 1, characterized in that: A plurality of fixing holes (6) are provided between the shaft hole (4) and the magnetic steel slot unit.

3. The self-starting permanent magnet synchronous motor rotor assembly according to claim 1, characterized in that: There are two magnetic steel single slots (5) in each group of magnetic steel slot units, and the two magnetic steel single slots (5) are located on the same horizontal line.

4. The self-starting permanent magnet synchronous motor rotor assembly according to claim 1, characterized in that: An end edge reinforcement groove (7) is extended from the outer end of the magnetic steel single groove (5), and the end edge reinforcement groove (7) is inclined relative to the magnetic steel single groove (5).

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