Motor energy-saving method and device based on electric permanent magnet

Abstract

The motor energy-saving method comprises the following steps: annularly arranging a plurality of electric permanent magnets on the inner wall of a motor shell cavity, arranging electrified coils outside the electric permanent magnets, electrifying the electrified coils, providing magnetic fields for a rotor and a stator winding by the magnetic force of the electric permanent magnets, respectively rotating the rotor and increasing the magnetic field of the stator winding. A plurality of supporting platforms are arranged on the inner wall of the motor shell along the circumference, electric permanent magnets are arranged on the supporting platforms, and electrified coils are wound on the electric permanent magnets. The beneficial effects of the invention are that when the power required by the motor rotor is not strong, the required magnetic field can be provided for the rotor only by the magnetic force of the electric permanent magnet, and when the magnetic field of the electric permanent magnet is insufficient, the electromagnetic coil can be electrified to enhance the magnetic field provided by the stator winding. According to the scheme, the excitation loss risk of the electric permanent magnet under the interference of other magnetic fields is overcome, the magnetic field intensity can be adjusted through the magnitude of the input current, and compared with the prior art, the high adjusting capacity and the energy-saving effect are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of motor energy saving, and more specifically to a motor energy saving method and device based on an electropermanent magnet. Background Art

[0002] During operation, the asynchronous motor needs to continuously pass current through the stator winding to generate a magnetic field to drive the rotor to rotate, thereby converting electrical energy into mechanical energy. However, in actual applications, since the motor stator is continuously passed through current and the resistance of the stator winding wire itself causes heat to be generated, the presence of heat further increases the resistance of the stator winding, thereby further generating more heat, resulting in a decrease in motor efficiency. In addition, due to the continuous heat generation, a fan driven by a rotating shaft is required to dissipate the heat from the motor, which further increases energy waste.

[0003] In recent years, permanent magnet motors have been used to a certain extent and have achieved good energy-saving effects. However, permanent magnet motors are expensive and have a certain demagnetization rate, which has a certain impact on their large-scale promotion. Summary of the invention

[0004] The present invention overcomes the deficiencies in the prior art and provides a motor energy-saving method and device based on an electropermanent magnet.

[0005] The purpose of the present invention is achieved through the following technical solutions.

[0006] A motor energy-saving method based on an electropermanent magnet comprises: arranging a plurality of electropermanent magnets in a ring shape on the inner wall of a motor housing cavity, arranging a power-carrying coil outside the electropermanent magnet, and supplying power to the power-carrying coil so that the magnetic force of the electropermanent magnet provides a magnetic field for a rotor and a stator winding, respectively causing the rotor to rotate and increasing the magnetic field of the stator winding.

[0007] 7. The magnetic field strength formed by the permanent magnet is B, the rotor current is I, the length of the rotor coil is L, and the Ampere force F exerted on the rotor is B*I*L.

[0008] When the ampere force required by the rotor is less than or equal to 0.5F, the current is stopped from flowing into the energized coil of the electropermanent magnet, and the current flowing into the rotor coil is adjusted to meet the power demand of the motor;

[0009] When the ampere force required by the rotor is in the range of 0.5F to 2F, the current flowing into the permanent magnet coil and the rotor coil are adjusted simultaneously to provide the required power to the motor.

[0010] A motor energy-saving device based on an electropermanent magnet comprises: a plurality of supporting platforms are arranged along the circumference on the inner wall of a motor housing, an electropermanent magnet is arranged on the supporting platform, and an energized coil is wound around the electropermanent magnet.

[0011] The electropermanent magnet is a columnar structure with an I-shaped cross section.

[0012] The supporting platform comprises a first supporting plate and a second supporting plate. The first supporting plate and the second supporting plate are plate bodies with L-shaped cross sections. The first supporting plate and the second supporting plate are arranged opposite to each other.

[0013] Thermal conductive glue is provided between the electropermanent magnet and the supporting platform.

[0014] The beneficial effects of the present invention are:

[0015] This solution adopts the method of winding electromagnetic coils outside the permanent magnet. When the required power is not strong, the magnetic force of the permanent magnet can provide the required magnetic field for the rotor. When the magnetic field of the permanent magnet is insufficient, the electromagnetic coil can be energized to enhance the magnetic field provided by the stator winding. This solution not only overcomes the risk of demagnetization of the permanent magnet under the interference of other magnetic fields, but also can adjust the magnetic field strength by the current. Compared with the existing technology, it has stronger adjustment ability and energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] Figure 2 is a schematic diagram of the structure of an electropermanent magnet;

[0018] In the figure: 1. motor housing; 2. support platform; 21. first support plate; 22. second support plate; 3. electropermanent magnet; 4. energized coil. DETAILED DESCRIPTION

[0019] Example

[0020] A motor energy-saving method based on an electropermanent magnet comprises: a plurality of electropermanent magnets 3 are arranged in a ring shape on the inner wall of a motor housing 1, a power-carrying coil is arranged outside the electropermanent magnet 3, and the magnetic force of the electropermanent magnet 3 provides a magnetic field for a rotor and a stator winding by energizing the power-carrying coil, thereby respectively rotating the rotor and increasing the magnetic field of the stator winding.

[0021] The magnetic field strength formed by the permanent magnet is B, the rotor current is I, the length of the rotor coil is L, and the Ampere force F exerted on the rotor is B*I*L.

[0022] When the ampere force required by the rotor is less than or equal to 0.5F, the current is stopped from flowing into the energized coil of the electropermanent magnet, and the current flowing into the rotor coil is adjusted to meet the power demand of the motor;

[0023] When the ampere force required by the rotor is in the range of 0.5F to 2F, the current flowing into the permanent magnet coil and the rotor coil are adjusted simultaneously to provide the required power to the motor.

[0024] A motor energy-saving device based on an electropermanent magnet comprises: a plurality of support platforms 2 are arranged along the circumference on the inner wall of a motor housing 1, an electropermanent magnet 3 is arranged on the support platform 2, and an energized coil 4 is wound around the electropermanent magnet 3.

[0025] The electropermanent magnet 3 is a columnar structure with an I-shaped cross section.

[0026] The supporting platform 2 includes a first supporting plate 21 and a second supporting plate 22 . The first supporting plate 21 and the second supporting plate 22 are plates with L-shaped cross sections. The first supporting plate 21 and the second supporting plate 22 are arranged opposite to each other.

[0027] Thermal conductive glue is provided between the electropermanent magnet 3 and the supporting platform 2 .

[0028] like Figure 1 and Figure 2 As shown, the working principle of this scheme is as follows: an electropermanent magnet 3 is arranged on the inner wall of the motor housing 1, and the electropermanent magnet 3 is energized through the energized coil 4 to generate a magnetic field to drive the rotor of the motor, and the magnetic field force is increased on the stator winding of the motor to make it have stronger power for driving.

[0029] Furthermore, the cross section of the electropermanent magnet 3 is an I-shaped structure, and the first support plate 21 and the second support plate 22 match its shape for clamping and limiting. The thermal conductive glue arranged between the electropermanent magnet 3 and the support platform 2 is used for heat conduction.

[0030] The embodiments of the present invention are described in detail above, but the contents described are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A motor energy saving method based on electropermanent magnets, characterized in that: include: A plurality of permanent magnets are arranged in a ring shape on the inner wall of the motor housing cavity, and a power-carrying coil is arranged outside the permanent magnet. By energizing the power-carrying coil, the magnetic force of the permanent magnet provides a magnetic field for the rotor and stator windings, thereby respectively rotating the rotor and increasing the magnetic field of the stator winding.

2. The method for energy saving of a motor based on an electropermanent magnet according to claim 2, characterized in that: The magnetic field strength formed by the permanent magnet is B, the rotor current is I, the length of the rotor coil is L, and the Ampere force F exerted on the rotor is B*I*L. When the ampere force required by the rotor is less than or equal to 0.5F, the current is stopped from flowing into the energized coil of the electropermanent magnet, and the current flowing into the rotor coil is adjusted to meet the power demand of the motor; When the ampere force required by the rotor is in the range of 0.5F to 2F, the current flowing into the permanent magnet coil and the rotor coil are adjusted simultaneously to provide the required power to the motor.

3. A motor energy-saving device based on an electropermanent magnet, characterized in that: include: A plurality of supporting platforms are arranged along the circumference of the inner wall of the motor housing, and an electro-permanent magnet is arranged on the supporting platform, and an energized coil is wound around the electro-permanent magnet.

4. The electric motor energy-saving device based on an electropermanent magnet according to claim 3 is characterized in that: The electropermanent magnet is a columnar structure with an I-shaped cross section.

5. The electric motor energy-saving device based on an electropermanent magnet according to claim 4, characterized in that: The support platform includes a first support plate and a second support plate. The first support plate and the second support plate are plates with L-shaped cross sections. The first support plate and the second support plate are arranged opposite to each other.

6. The electric motor energy-saving device based on an electropermanent magnet according to claim 3, characterized in that: Heat-conducting glue is provided between the electropermanent magnet and the supporting platform.

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