Novel potting type permanent magnet synchronous motor

Abstract

The invention discloses a novel potting type permanent magnet synchronous motor, which comprises a casing, and a stator iron core and a rotor which are arranged in the casing, the stator iron core comprises a plurality of sections of segmented iron cores which are fixedly connected with each other, a front end cover and a rear end cover are respectively arranged at the front part and the rear part of the casing, an oil pump for extracting cooling oil is arranged on the casing, and the rotor is arranged on the casing. The oil pump is connected with a condenser, and a through hole for a motor shaft to extend out is formed in the rear end cover, so that the groove fullness rate can be increased, the torque pulsation can be improved, and the magnetic demagnetization resistance can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and particularly to a novel potted permanent magnet synchronous motor. Background Art

[0002] At present, permanent magnet synchronous motors are widely used. However, such motors still have problems such as low slot fill factor, insufficient anti-demagnetization ability, and unstable insulation performance of the rotor, which may cause current harmonics and affect the stable operation of the motor. Mechanical vibration and temperature rise: Due to poor insulation, the mechanical vibration of the motor may increase, accompanied by a temperature rise, which will not only reduce the efficiency of the motor but also accelerate the wear of the equipment. Summary of the Invention

[0003] The purpose of the present invention is to provide a novel potted permanent magnet synchronous motor, which can improve the slot fill factor, improve torque ripple, and enhance the anti-demagnetization ability.

[0004] A novel potted permanent magnet synchronous motor provided according to the present invention includes a housing, a stator core and a rotor installed in the housing. The stator core includes multiple segmented cores fixedly connected to each other. The front end cover and the rear end cover are respectively installed at the front and rear of the housing. An oil pump for extracting cooling oil is installed on the housing, and the oil pump is connected to a condenser. A through hole for the motor shaft to extend out is opened on the rear end cover.

[0005] Further, the stator is insulated by a potting process.

[0006] Further, the rotor includes multiple permanent magnet blocks fixedly connected to each other.

[0007] Further, the multiple segmented cores are connected by welding.

[0008] Further, the multiple permanent magnet blocks are connected by welding.

[0009] Further, the outer surface of the rotor is designed with sinusoidalization.

[0010] Further, the potting process includes the steps of:

[0011] S1: Place the stator on the workbench of the potting machine and fix the stator with a fixing device;

[0012] S2: Preheat the motor stator coil, the mold and the potting adhesive, with a preheating temperature of 60 °C and a preheating time of at least 1 hour;

[0013] S3: Mix the A and B components of the potting adhesive in proportion and stir evenly;

[0014] S4: Inject the mixed glue into the stator through a glue filling device to ensure that the glue fully fills the gaps in the stator windings;

[0015] S5: Let the poured insulating material cure under certain temperature and time conditions.

[0016] Furthermore, before step S1, it is also necessary to remove the dirt and grease on the surface of the stator.

[0017] Furthermore, between step S3 and step S4, it is also necessary to remove the air bubbles and voids in the insulating material.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. The stator core adopts a segmented design, which can reduce eddy current losses. The segmented design can reduce the cross-sectional area of the core, thereby reducing eddy current losses and improving the efficiency of the motor; The multi-segment segmentation scheme can divide the stator core into several segments of different lengths according to the size and power requirements of the motor. This flexibility enables the segmented core structure to be widely applied to motors of various specifications and requirements; High winding stability: Since the winding length is shorter, the stator core is subjected to less pressure, which improves the stability of the winding. At the same time, the stator core is evenly stressed, further ensuring the stable performance of the motor.

[0020] 2. The rotor adopts a segmented design, which can reduce the magnetic steel loss and improve the anti-demagnetization ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the novel potted permanent magnet synchronous motor described in the embodiment of the present invention;

[0022] Figure 2 is a cross-sectional structural diagram of the novel potted permanent magnet synchronous motor described in the embodiment of the present invention.

[0023] In the figure, 1 - housing; 2 - stator core; 3 - front end cover; 4 - rear end cover; 5 - motor shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0025] Combined with Figure 1 and Figure 2, which shows a new type of encapsulated permanent magnet synchronous motor of the present invention, including a motor housing 1, a stator core 2 and a rotor installed in the motor housing 1. The stator core 2 includes multiple segments of segmented cores fixedly connected to each other. A front end cover 3 and a rear end cover 4 are respectively installed at the front and rear of the motor housing 1. An oil pump for extracting cooling oil is installed on the motor housing 1, and the oil pump is connected to a condenser. A through hole for the motor shaft 5 to extend out is provided on the rear end cover 4.

[0026] The stator is insulated by an encapsulation process.

[0027] The rotor includes multiple segments of permanent magnet steel fixedly connected to each other.

[0028] The multiple segments of segmented cores are connected by welding.

[0029] The multiple segments of permanent magnet steel are connected by welding.

[0030] The outer surface of the rotor is designed with sinusoidalization.

[0031] The sinusoidalization design of the rotor surface means that in the motor design, the magnetic field distribution on the rotor surface is close to a sinusoidal waveform. This design is mainly to optimize the operating performance of the motor, improve efficiency and reduce harmonics.

[0032] To achieve the sinusoidalization design of the rotor surface, magnetic line channels can be set in the area between the permanent magnets and the outer circle of the iron core of the motor rotor. The sizes and shapes of these magnetic line channels are precisely designed so that the magnetic field passing through the outer circle of the rotor can be close to a sinusoidal distribution. Specifically, the permanent magnets can be divided into several equal parts, each part corresponding to a magnetic line channel, and then the circumferential dimensions of each magnetic line channel are set to achieve the effect of sinusoidal distribution.

[0033] The encapsulation process includes the steps:

[0034] S1: Place the stator on the workbench of the potting machine, and fix the stator with a fixing device;

[0035] S2: Preheat the motor stator coil, mold and potting adhesive. The preheating temperature is 60°C, and the preheating time is at least 1 hour;

[0036] S3: Mix the A and B agents of the potting adhesive in proportion and stir evenly;

[0037] S4: Inject the mixed glue into the stator through the potting equipment to ensure that the glue fully fills the gaps of the stator winding;

[0038] S5: Let the poured insulating material cure under certain temperature and time conditions.

[0039] Before step S1, it is also necessary to remove the dirt and grease on the stator surface.

[0040] It is also necessary to exclude air bubbles and voids in the insulating material between step S3 and step S4.

[0041] The beneficial effects of the present invention are as follows:

[0042] 1. The stator core adopts a segmented design, which can reduce eddy current loss. The segmented design can reduce the cross-sectional area of the core, thereby reducing eddy current loss and improving the efficiency of the motor. The multi-segment segmentation scheme can divide the stator core into several segments of different lengths according to the size and power requirements of the motor. This flexibility enables the segmented core structure to be widely applied to motors of various specifications and requirements. High winding stability: Since the winding length is short, the stator core is subjected to less pressure, which improves the stability of the winding. At the same time, the stator core is uniformly stressed, further ensuring the stable performance of the motor.

[0043] 2. The rotor adopts a segmented design, which can reduce the loss of permanent magnets and improve the anti-demagnetization ability.

[0044] The above are only the preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A new type of potted permanent magnet synchronous motor, characterized in that: It includes a casing and a stator core and a rotor installed in the casing. The stator core includes multiple segmented cores fixedly connected to each other. A front cover and a rear cover are respectively installed at the front and rear of the casing. An oil pump for extracting cooling oil is installed on the casing. The oil pump is connected to a condenser. A through hole is opened on the rear cover from which the power supply shaft extends.

2. The novel encapsulated permanent magnet synchronous motor according to claim 1 is characterized in that: The stator is insulated by a potting process.

3. The novel potted permanent magnet synchronous motor according to claim 1 is characterized in that: The rotor comprises a plurality of sections of permanent magnetic steel fixedly connected to each other.

4. The novel potted permanent magnet synchronous motor according to claim 1 is characterized in that: The multiple segments of the segmented iron core are connected by welding.

5. The novel potted permanent magnet synchronous motor according to claim 3 is characterized in that: Multiple sections of permanent magnet steel are connected by welding.

6. The novel potted permanent magnet synchronous motor according to claim 5 is characterized in that: The outer surface of the rotor adopts a sinusoidal design.

7. The novel potted permanent magnet synchronous motor according to claim 2 is characterized in that: The potting process comprises the steps of: S1: Place the stator on the workbench of the glue filling machine and fix the stator with a fixing device; S2: Preheat the motor stator coil, mold and potting glue at 60°C for at least 1 hour; S3: Mix the A and B agents of the potting glue in proportion and stir evenly; S4: Inject the mixed glue into the stator through the glue filling equipment to ensure that the glue fully fills the gaps in the stator windings; S5: Allow the poured insulation material to solidify under certain temperature and time conditions.

8. The novel potted permanent magnet synchronous motor according to claim 7 is characterized in that: Before step S1, dirt and grease on the stator surface need to be removed.

9. The novel potted permanent magnet synchronous motor according to claim 7 is characterized in that: It is also necessary to remove bubbles and voids in the insulating material between step S3 and step S4.

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