Permanent magnet motor rotor pole

Abstract

The application discloses a permanent magnet motor rotor magnetic pole, which comprises a rotor yoke, a magnetic pole box, a permanent magnet, a magnetic pole pressing block, a copper strip and an end ring. The magnetic pole box is adopted, and four damping holes, two large and two small, are arranged on each magnetic pole box. Two kinds of copper strips are respectively arranged in the damping holes. The copper strip is longer than the two ends of the rotor of the motor, and is welded and fixed at the junction of the copper strip and the magnetic pole box to form two closed loops. The damping holes added on the magnetic pole box of the rotor can reduce the magnetic flux leakage of the rotor of the motor, improve the operation efficiency of the motor, and form a loop with the end ring through the added copper strip to constitute a damping winding. The smoothness and dynamic response capability of the motor during operation are effectively improved, the current of the motor during asynchronous starting is reduced, and the reliability of the operation of the pod is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of pod permanent magnet motor, and particularly relates to a permanent magnet motor rotor magnetic pole. BACKGROUND

[0002] The pod propeller is a highly integrated propelling device, and realizes integrated integration of the motor and the propeller and direct driving of the power device. Since the working environment thereof is harsh, the requirement for protection of the magnetic pole is high, rusting of the magnetic steel is avoided, and then the working performance and service life of the propeller are affected.

[0003] At present, the pod propelling motor requires high torque density when running. The traditional pod propelling motor rotor magnetic pole structure adopts a magnetic pole box type permanent magnet synchronous motor. The permanent magnet is arranged in the magnetic pole box which is formed by laminating silicon steel sheets. Two magnetic pole boxes are fixed on the rotor yoke through a pressing block. In this way, the motor has a wide speed regulation range and strong overload capacity.

[0004] The scheme has the following disadvantages: the magnetic leakage of the motor is large, the rotor is seriously heated, the operation efficiency of the motor is reduced, the smoothness and dynamic response capability of the motor during operation are poor, the starting current of the motor is large when the motor is started asynchronously, and the reliability and stability of the motor need to be improved. SUMMARY

[0005] In order to solve the above problems in the prior art, the application provides a permanent magnet motor rotor magnetic pole, which reduces the magnetic leakage of the motor and improves the efficiency and operation stability of the motor.

[0006] The technical scheme adopted by the application to solve the technical problem is as follows: a permanent magnet motor rotor magnetic pole, comprising a plurality of magnetic pole boxes installed on the outer side of a rotor yoke and permanent magnets arranged in the magnetic pole boxes, two adjacent magnetic pole boxes are fixed through a magnetic pole pressing block, two damping holes are arranged on the left and right sides of each magnetic pole box, each magnetic pole box has a total of four damping holes, a copper bar is arranged in each damping hole, and an end ring connecting the copper bars is arranged at the end of the rotor.

[0007] Further, the two damping holes on each side of the magnetic pole box are arranged in a small one on top and a large one on bottom.

[0008] Further, the two damping holes on each side of the magnetic pole box are arranged in a small one on top and a large one on bottom.

[0009] The copper bar of the permanent magnet motor rotor magnetic pole is 40 mm long at each end of the rotor of the motor, and the copper bars arranged in the damping holes are welded and fixed at the junction of the copper bars and the magnetic pole box, and form two closed loops with the two end rings.

[0010] The beneficial effects of the present application are that the damping holes added on the magnetic pole box can reduce the magnetic leakage of the motor rotor, reduce the rotor iron loss and the heat generation of the rotor, improve the operation efficiency of the motor, the copper bars and the end ring form a loop to constitute a damping winding, which can effectively improve the smoothness and dynamic response capability of the motor during operation, can reduce the current during asynchronous starting of the motor, and improve the reliability of the pod operation. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a structural schematic diagram of the present application;

[0012] Figure 2 is a rotor magnetic pole diagram of the first embodiment of the present application;

[0013] Figure 3 is a rotor magnetic pole diagram of the second embodiment of the present application.

[0014] The reference signs are as follows: 1 - magnetic pole box, 2 - copper bar, 3 - permanent magnet, 4 - magnetic pole pressing block, 5 - end ring. EMBODIMENT

[0015] The present application will be further described below in conjunction with the drawings and specific embodiments.

[0016] The embodiments of the present application will be described in detail below with reference to the drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application. For example, although the various components in the drawings are drawn in a specific proportion, these proportion relationships are only exemplary, and those skilled in the art can adjust them as needed to adapt to specific application occasions.

[0017] It should be noted that in the description of the present application, the terms "center", "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore cannot be understood as limiting the application.

[0018] In addition, it should also be noted that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the connection between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0019] According to one example of the present application, as shown in Figure 1 The permanent magnet motor rotor magnetic pole disclosed by the present application is composed of a magnetic pole box 1, a copper strip 2, a permanent magnet 3, a magnetic pole pressing block 4, and an end ring 5. Two adjacent magnetic pole boxes 1 on the outer side of the rotor yoke are fixed by the magnetic pole pressing block 4. Each magnetic pole box 1 is provided with two damping holes on the left and right sides, and each magnetic pole box 1 is provided with a total of four damping holes. As shown in Figure 2 The two damping holes on each side are small and large, and the small damping hole is close to the rotor air gap. The copper strip 2 is placed in the damping hole. The end ring 5 is arranged at the end of the rotor to connect the copper strips 2. The copper strip 2 is 40 mm longer than the two ends of the rotor of the motor. Different diameter copper strips 2 are respectively placed in the damping holes. The copper strips 2 and the magnetic pole boxes 1 are welded and fixed at the junction, and two large loops are formed with the two end rings 5.

[0020] Another embodiment of the present application is shown in Figure 3 The two damping holes on each side of the magnetic pole box 1 are the same size and arranged on the left and right sides. The copper strip 2 is 40 mm longer than the two ends of the rotor of the motor. Different diameter copper strips 2 are respectively placed in the damping holes. The copper strips 2 and the magnetic pole boxes 1 are welded and fixed at the junction, and two large loops are formed with the two end rings 5.

[0021] The above embodiments only exemplarily illustrate the principles and effects of the present application, and part of the embodiments are applied. For ordinary skilled in the art, without departing from the inventive concept, a number of modifications and improvements can be made, which are within the scope of protection of the present application.

Claims

1. A permanent magnet machine rotor pole, characterized by: It includes multiple magnetic pole boxes (1) installed outside the rotor yoke and permanent magnets (3) placed in the magnetic pole boxes (1), two adjacent magnetic pole boxes (1) are fixed through magnetic pole pressing blocks (4), both sides of the magnetic pole boxes (1) are provided with two damping holes, copper bars (2) are placed in the damping holes, and end rings (5) connecting the copper bars (2) are arranged at the end of the rotor.

2. A permanent magnet machine rotor pole according to claim 1, characterized in that The two damping holes on each side of the magnetic pole box (1) are arranged in small and large sizes from top to bottom, wherein the small damping hole on the top is close to the rotor air gap.

3. A permanent magnet machine rotor pole according to claim 1, characterized in that The two damping holes on each side of the magnetic pole box (1) are arranged in the same size from left to right.

4. A magnetic pole for a rotor of a permanent magnet electric machine according to claim 2 or 3, characterized in that The copper bar (2) is longer than the two ends of the rotor, the copper bar (2) in the damping hole is welded and fixed at the junction of the copper bar (2) and the magnetic pole box (1), and two closed loops are formed with the two end rings (5).

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