Self-starting three-phase permanent magnet low-speed synchronous motor

Abstract

The utility model discloses a self-starting three-phase permanent magnet low-speed synchronous motor, and belongs to the technical field of permanent magnet motors. Comprising a casing and a front cover fixedly connected with the casing through bolts, and further comprises a rotating shaft rotationally connected to the casing; the stator part is fixedly connected in the shell; the rotor part is fixedly connected to the rotating shaft, and the rotor part is rotationally connected with the stator part; the stator part consists of a plurality of groups of stator punching sheets; stator grooves and positioning grooves are formed in the stator punching sheets; the rotor part is composed of a plurality of groups of rotor punching sheets, and the rotor punching sheets are provided with shaft holes and magnetic steel holes. A permanent magnet is connected in the magnetic steel hole; according to the utility model, a traditional squirrel-cage cast aluminum auxiliary starting structure is abandoned, self-starting is realized by adjusting the magnetic field cooperation of the stator and the rotor, the starting current is small, and the starting time is effectively shortened compared with that of a traditional motor; and during low-speed operation, torque output is stable, meanwhile, additional loss caused by a squirrel-cage cast aluminum structure is reduced, and the energy utilization efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to permanent magnet motor technical field especially relates to a self starting three phase permanent magnet low speed synchronous motor. BACKGROUND

[0002] Permanent magnet synchronous motor has simple structure, small size, high efficiency, high power factor and other advantages, is widely used in household appliances and industrial equipment.

[0003] Low speed three phase permanent magnet synchronous motor, on September 15, 2023, the publication number for CN219697391U, including motor and mounting frame, motor bottom is provided with base, both sides of base are provided with two groups of mounting holes, both sides of mounting frame are provided with two groups of arc grooves, first sliding slot is provided in arc groove, a plurality of groups of fixed holes are arranged on the both sides of arc groove, adjusting rod is arranged on the inner side of arc groove, first sliding block is arranged on the both sides of adjusting rod, mounting rod is arranged in adjusting rod, pull block is arranged at the one end of mounting rod, fixed ring is arranged on the outer side of one end of adjusting rod, fixed rod is arranged on the one side of fixed ring, second sliding slot is arranged in adjusting rod, second sliding block and spring are arranged in second sliding slot.The utility model discloses through being provided with mounting rod and mounting hole, the installation and dismounting of motor can be more convenient and fast;By being provided with arc groove and fixed ring, the motor can be adjusted according to the angle of different device's demand.

[0004] But the above permanent magnet synchronous motor adopts the structure of squirrel cage cast aluminum combined with internal insertion magnetic sheet to realize starting, but this structure can increase the loss of motor, reduce efficiency, and the squirrel cage structure is prone to failure, which can affect the reliability and service life of the motor. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the problem in the above background art and provides a self starting three phase permanent magnet low speed synchronous motor.

[0006] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] A self starting three phase permanent magnet low speed synchronous motor, including the casing and front cover, the front cover is fixedly connected with the casing through bolt, still include:

[0008] The rotating shaft is rotatably connected to the casing.

[0009] The stator part is fixedly connected in the casing.

[0010] The rotor part is fixedly connected to the rotating shaft, and the rotor part is rotatably connected to the stator part.

[0011] The stator part is composed of a plurality of stator punching sheets, and the stator punching sheet is provided with a stator slot and a positioning slot.

[0012] The rotor part is composed of multiple groups of rotor laminations, and the rotor laminations are provided with shaft holes and magnetic steel holes;

[0013] Permanent magnets are connected in the magnetic steel holes.

[0014] Preferably, the first bearing is fixedly connected to the casing, and the rotating shaft is rotationally connected to the first bearing.

[0015] Further, the second bearing is fixedly connected to the front cover, and the rotating shaft is rotationally connected to the second bearing.

[0016] Preferably, the oil seal is fixedly connected to the front cover, and the oil seal is rotationally connected to the rotating shaft.

[0017] Further, the first sealing ring is fixedly connected to the front cover.

[0018] Still further, the second sealing ring is fixedly connected to the front cover, and the second sealing ring is attached to the casing.

[0019] Still further, the third sealing ring is fixedly connected to the front cover, and the third sealing ring is attached to the inner wall of the casing.

[0020] Compared with the prior art, the self-starting three-phase permanent magnet low-speed synchronous motor has the following beneficial effects:

[0021] The parts not involved in the device are the same as or can be realized by the prior art, the traditional squirrel cage cast aluminum auxiliary starting structure is abandoned, self-starting is realized by adjusting the cooperation of the stator and the rotor magnetic field, the starting current is small, and the starting time is effectively shortened compared with the traditional motor; and when running at low speed, the torque output is stable, and the application reduces the additional loss caused by the squirrel cage cast aluminum structure, and improves the energy utilization efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 A structure diagram of the self-starting three-phase permanent magnet low-speed synchronous motor is provided.

[0023] Fig. 2 A structure diagram of the self-starting three-phase permanent magnet low-speed synchronous motor is provided.

[0024] In the figure: 1, stator part; 101, stator lamination; 1011, stator slot; 1012, positioning slot; 2, rotor part; 201, rotor lamination; 2011, magnetic steel hole; 2012, shaft hole; 3, machine shell; 301, first bearing; 302, second bearing; 4, front cover; 401, bolt; 5, enameled wire; 6, rotating shaft; 601, oil seal; 602, first sealing ring; 7, permanent magnet; 8, power line; 9, third sealing ring; 10, second sealing ring. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0026] Embodiment 1

[0027] Referring to Figs. 1-2 A self-starting three-phase permanent magnet low-speed synchronous motor, comprising a machine shell 3 and a front cover 4, the front cover 4 is fixedly connected with the machine shell 3 through a bolt 401, and further comprising:

[0028] A rotating shaft 6 is rotatably connected to the machine shell 3.

[0029] A stator part 1 is fixedly connected in the machine shell 3.

[0030] A rotor part 2 is fixedly connected to the rotating shaft 6, and the rotor part 2 is rotatably connected with the stator part 1.

[0031] The stator part 1 is composed of a plurality of stator laminations 101, and the stator lamination 101 is provided with a stator slot 1011 and a positioning slot 1012.

[0032] The rotor part 2 is composed of a plurality of rotor laminations 201, and the rotor lamination 201 is provided with a shaft hole 2012 and a magnetic steel hole 2011.

[0033] The magnetic steel hole 2011 is connected with a permanent magnet 7.

[0034] The stator part 1 is connected with an enameled wire 5 with a power line 8, and the power line 8 is connected with an external three-phase alternating current power supply.

[0035] The machine shell 3 is fixedly connected with a first bearing 301, and the rotating shaft 6 is rotatably connected with the first bearing 301.

[0036] The front cover 4 is fixedly connected with a second bearing 302, and the rotating shaft 6 is rotatably connected with the second bearing 302.

[0037] Referring to Figs. 1-2When three-phase alternating current power is turned on, the current will pass through the stator part 1 through the power line 8, and the three-phase alternating current generates a rotating magnetic field in the winding in the stator slot 1011; the fundamental wave and each harmonic wave of the rotating magnetic field interact with the rotor part 2;

[0038] The rotor part 2 is composed of a plurality of rotor laminations 201 provided with magnetic steel holes 2011, and the permanent magnets 7 connected in the magnetic steel holes 2011 generate a constant magnetic field; at the initial stage of starting, the harmonic waves of the stator rotating magnetic field interact with the magnetic field of the permanent magnets 7 to generate a starting torque, so as to promote the rotor part 2 fixed on the rotating shaft 6 to start rotating; with the gradual increase of the rotor rotating speed, the synchronous action of the fundamental wave of the stator rotating magnetic field and the magnetic field of the permanent magnets 7 gradually increases, and finally the motor enters a stable synchronous operation state.

[0039] The front cover 4 is fixedly connected with an oil seal 601, and the oil seal 601 is rotationally connected with the rotating shaft 6.

[0040] The plurality of oil seals 601 connected on the front cover 4 further ensure the sealing property between the rotating shaft 6 and the front cover 4.

[0041] The front cover 4 is fixedly connected with a first sealing ring 602.

[0042] The first sealing ring 602 fixedly connected on the front cover 4 further ensures the sealing property between the rotating shaft 6 and the front cover 4.

[0043] The front cover 4 is fixedly connected with a second sealing ring 10, and the second sealing ring 10 is attached to the shell 3.

[0044] The second sealing ring 10 fixedly connected on the front cover 4 further ensures the sealing property between the front cover 4 and the shell 3.

[0045] The front cover 4 is fixedly connected with a third sealing ring 9, and the third sealing ring 9 is attached to the inner wall of the shell 3.

[0046] The third sealing ring 9 fixedly connected on the front cover 4 further ensures the sealing property between the front cover 4 and the shell 3.

[0047] The utility model discloses discard traditional squirrel cage type cast aluminum auxiliary starting structure, and realizes self starting through adjusting stator and rotor magnetic field cooperation, and the starting current is small, and the starting time is shortened 20 %-30 % compared with traditional motor. And when running at low speed, torque output is stable, and the application reduces the additional loss of squirrel cage type cast aluminum structure, and improves energy utilization efficiency.

[0048] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and inventive concept of the present application, can make equivalent substitutions or changes within the technical range disclosed by the present application, which should be encompassed in the protection scope of the present application.

Claims

1. A self-starting three-phase low-speed synchronous motor with permanent magnets, comprising a casing (3) and a front cover (4) fixed to the casing (3) by means of bolts (401), characterised in that, Also include: The rotating shaft (6), rotationally connected in the casing (3); Stator (1), fixedly connected in the casing (3); Rotor (2), fixedly connected to the rotating shaft (6), and the rotor (2) and the stator (1) are rotationally connected; The stator (1) is composed of a plurality of stator lamination (101), the stator lamination (101) is provided with stator slot (1011) and positioning groove (1012); The rotor (2) is composed of a plurality of rotor lamination (201), the rotor lamination (201) is provided with shaft hole (2012) and magnetic steel hole (2011); The magnetic steel hole (2011) is connected with permanent magnet (7).

2. A self-starting three-phase low-speed synchronous motor according to claim 1, characterized in that, The casing (3) is fixedly connected with the first bearing (301), the rotating shaft (6) and the first bearing (301) are rotationally connected.

3. A self-starting three-phase low-speed synchronous motor according to claim 2, characterized in that The front cover (4) is fixedly connected with the second bearing (302), the rotating shaft (6) and the second bearing (302) are rotationally connected.

4. A self-starting three-phase low-speed synchronous motor with permanent magnets according to claim 1, characterized in that, The front cover (4) is fixedly connected with the oil seal (601), the oil seal (601) and the rotating shaft (6) are rotationally connected.

5. A self-starting three-phase low-speed synchronous motor with permanent magnets according to claim 4, characterized in that, The front cover (4) is fixedly connected with the first sealing ring (602).

6. A self-starting three-phase low-speed synchronous motor according to claim 5, characterized in that The front cover (4) is fixedly connected with the second sealing ring (10), the second sealing ring (10) and the casing (3) are attached.

7. A self-starting three-phase low-speed synchronous motor with permanent magnets according to claim 6, characterized in that The front cover (4) is fixedly connected with the third sealing ring (9), the third sealing ring (9) and the inner wall of the casing (3) are attached.

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