Self-starting surface-mounted permanent magnet synchronous motor
By adding conductive closed-circuit loops in the squirrel cage of the surface-mount permanent magnet synchronous motor, the induction start-up ring is used to achieve the motor self-starting and normal operation, the problem of high motor failure rate in harsh environments in the prior art is solved, and efficiency and reliability are improved.
Patent Information
- Application Number
- CN202420348173.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-26
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-02-26
AI Technical Summary
When the existing surface-mount permanent magnet synchronous motor is used at a fixed speed, the failure rate of the controller and the inverter has increased significantly in harsh environments, and the use efficiency is low, which increases the operating cost.
A self-starting surface-mounted permanent magnet synchronous motor is used to add a conductive closed loop in the squirrel cage, and an induction start ring is used to generate induced current during startup, generating torque to make the motor run. After the rotor speed increases, the induced current decreases until the induction magnetic field of the rotor is synchronized with the stator core magnetic field.
It realizes normal start-up and operation of the motor in harsh environments, reduces the failure rate, improves the use efficiency, and saves operating costs.
Smart Images
Figure CN222674009U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of electromechanical technology, in particular to a self-starting surface-mounted permanent magnet synchronous motor. Background Art
[0002] At present, with the development of science and technology, permanent magnet motors have been widely used due to their large weight-to-volume-to-power ratio and high efficiency. According to the speed change, they are divided into adjustable speed motors and fixed speed motors. According to the starting (or power supply) method, they are divided into direct starting and variable frequency starting. According to the position of the permanent magnet, they are divided into surface mount type and built-in type.
[0003] In the use of surface-mounted permanent magnet synchronous motors, variable frequency starting and controller starting are commonly used. However, under some conditions, the motor does not need to change the speed, that is, the motor works at a fixed speed, and the controller and inverter are only used temporarily at the start. The control circuit only starts the motor to complete the task, which is inefficient and increases the operating cost. The most important thing is that the inverter or controller has a significantly increased failure rate in harsh environments, such as high temperature, low temperature, humidity, and corrosion, and may even be unusable. Surface-mounted motors are currently still started with the help of control circuits, such as the commonly used DC brushless motors. Utility Model Content
[0004] The purpose of the utility model is to provide a self-starting surface-mounted permanent magnet synchronous motor to solve the problems raised in the above background technology.
[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0006] Self-starting surface-mounted permanent magnet synchronous motor, including:
[0007] Rotor core;
[0008] A squirrel cage, wherein a plurality of mounting holes are evenly opened on the surface of the squirrel cage;
[0009] A plurality of magnets, wherein the magnets are installed inside the mounting hole;
[0010] A stator core has a plurality of windings evenly mounted inside.
[0011] As a further solution of the utility model: the rotor core is installed on the outside of the squirrel cage, the stator core is installed on the inside of the squirrel cage, one side surface of the magnet fits the inner surface of the rotor core, and the other side surface of the magnet fits the outer surface of the stator core.
[0012] As a further solution of the utility model: the rotor core is installed on the inner side of the squirrel cage, the stator core is installed on the outer side of the squirrel cage, one side surface of the magnet fits the outer surface of the rotor core, and the other side surface of the magnet fits the inner surface of the stator core.
[0013] As a further solution of the utility model: the number of the magnets is equal to the number of the mounting holes.
[0014] Compared with the prior art, the beneficial effects of the utility model are:
[0015] The utility model adds an induction starting ring, i.e., a squirrel cage, to start the synchronous motor asynchronously. A conductive closed loop is added at the interval and around each magnet. The direction of the closed loop is perpendicular to the magnetic field. When starting, the squirrel cage ribs cut the rotating magnetic field of the stator core to generate an induced current. This induced current interacts with the stator core to generate torque to make the motor run. As the rotor speed increases, the current gradually decreases until the rotor's induced magnetic field is synchronized with the stator core magnetic field. At this time, the induced current of the squirrel cage ribs tends to zero, and the motor starts and runs normally. At this time, the magnetic field of the magnet replaces the magnetic field of the squirrel cage to make the motor continue to run. This utility model is particularly suitable for low-speed, high-torque surface permanent magnet motors. It can directly replace the combination of asynchronous motors and reducers in many occasions and equipment. It is both energy-saving and simple. The cross-section of the squirrel cage spaced in the magnet can have different shapes according to needs. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of a first embodiment of a self-starting surface-mounted permanent magnet synchronous motor;
[0017] Figure 2 An exploded view of a first embodiment of a self-starting surface-mounted permanent magnet synchronous motor;
[0018] Figure 3 It is a structural schematic diagram of a second embodiment of a self-starting surface-mounted permanent magnet synchronous motor;
[0019] Figure 4 It is an exploded view of the second embodiment of the self-starting surface-mounted permanent magnet synchronous motor.
[0020] In the figure: 1. Rotor core; 2. Squirrel cage; 3. Mounting hole; 4. Magnet; 5. Stator core; 6. Winding. DETAILED DESCRIPTION
[0021] See also Figure 1 and Figure 2 The first embodiment of the utility model is a self-starting surface-mounted permanent magnet synchronous motor, comprising:
[0022] Rotor core 1;
[0023] A cage 2, a rotor core 1 is mounted on the outside of the cage 2, and a plurality of mounting holes 3 are evenly opened on the surface of the cage 2;
[0024] A plurality of magnets 4, the number of the magnets 4 is equal to the number of the mounting holes 3, and the magnets 4 are mounted inside the mounting holes 3;
[0025] The stator core 5 is installed inside the cage 2, one side surface of the magnet 4 is in contact with the inner surface of the rotor core 1, and the other side surface of the magnet 4 is in contact with the outer surface of the stator core 5, and a plurality of windings 6 are evenly installed inside the stator core 5;
[0026] When the motor starts, the cage 2 induces the magnetic field of the stator core 5 to generate torque to start the motor. The width of the magnets 4 in the cage 2 cannot be too large, because if it is too large, the area of the magnets 4 will be reduced, thereby reducing the magnetic flux of the stator core 5. The cage ribs, that is, the cross-sectional area of the area between two adjacent magnets 4 in the cage 2, should be sufficient to generate the starter torque. In order to neither reduce the cross-section of the cage 2 nor the area of the magnets 4, the cage ribs can be increased in different shapes. The materials of the cage 2 are different, and the required cross-sectional area is also different. In order to improve the characteristics of the starting torque, the density of the cage ribs can be increased.
[0027] It is applicable to surface-mounted permanent magnet motors, both hidden and convex. According to the winding status, it is also applicable to concentrated windings and distributed windings. Some surface-mounted motors have reversed or reversed stator windings, which means that the rotating magnetic fields they produce are opposite or uneven, so asynchronous starting is not suitable, because the torques induced by the rotor core 1 will cancel each other out and cannot start normally. According to the power supply provided, it can be driven directly by AC or three-phase power, or it can be driven by frequency conversion or controller.
[0028] Figure 3 and Figure 4 The second embodiment of the present invention is a self-starting surface-mounted permanent magnet synchronous motor, comprising:
[0029] Rotor core 1;
[0030] A cage 2, a rotor core 1 is installed inside the cage 2, and a plurality of mounting holes 3 are evenly opened on the surface of the cage 2;
[0031] A plurality of magnets 4, the number of the magnets 4 is equal to the number of the mounting holes 3, and the magnets 4 are mounted inside the mounting holes 3;
[0032] The stator core 5 is installed on the outside of the squirrel cage 2, one side surface of the magnet 4 is in contact with the outer surface of the rotor core 1, and the other side surface of the magnet 4 is in contact with the inner surface of the stator core 5, and a plurality of windings 6 are evenly installed inside the stator core 5.
[0033] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A self-starting surface-mounted permanent magnet synchronous motor, characterized in that: include: Rotor core (1); A squirrel cage (2), wherein a plurality of mounting holes (3) are evenly arranged on the surface of the squirrel cage (2); A plurality of magnets (4), wherein the magnets (4) are mounted inside the mounting holes (3); A stator core (5), wherein a plurality of windings (6) are evenly mounted inside the stator core (5); The rotor core (1) is mounted on the outside of the cage (2), the stator core (5) is mounted on the inside of the cage (2), one side surface of the magnet (4) is in contact with the inner surface of the rotor core (1), and the other side surface of the magnet (4) is in contact with the outer surface of the stator core (5); The rotor core (1) is mounted on the inner side of the cage (2), the stator core (5) is mounted on the outer side of the cage (2), one side surface of the magnet (4) is in contact with the outer surface of the rotor core (1), and the other side surface of the magnet (4) is in contact with the inner surface of the stator core (5).
2. The self-starting surface-mounted permanent magnet synchronous motor according to claim 1, characterized in that: The number of the magnets (4) is equal to the number of the mounting holes (3).