High-torque-density permanent magnet direct drive motor
By using an inner rotor and outer stator structure and a single-layer full-pitch winding design, the motor pole ratio is increased, solving the problems of low efficiency and difficult maintenance of traditional motor structures. This achieves high torque density and efficient drive, meeting the special requirements of robot joints.
Patent Information
- Application Number
- CN202423007071.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-12-06
AI Technical Summary
In the existing technology, traditional high-torque motors have low efficiency and are prone to wear and tear, mechanical gearboxes are difficult to maintain, and low-speed high-torque motors are large in size and expensive.
It adopts an inner rotor and outer stator structure. The inner rotor surface is equipped with radially magnetized permanent magnets, and the outer stator surface is equipped with a single-layer full-pitch winding. The pole ratio is increased to improve the magnetic load, eliminating the need for a gear reducer and directly driving the motor to increase torque density.
The structure is simplified, the torque density of the motor is increased, safety and reliability are enhanced, costs are reduced, control precision is improved, and the requirements of special working conditions such as robot joints are met.
Smart Images
Figure CN223527868U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to motor technical field especially relates to a high torque density permanent magnet direct drive motor. BACKGROUND
[0002] High torque density motor is often needed at the joint of robot, the current structure type one is through gear reduction device and enlargies the torque of traditional permanent magnet motor, another is to design the large size low speed large torque motor, and then reaches the technical requirement.
[0003] The traditional reduction motor structure is composed of motor and mechanical gear box, the overall efficiency is low, and the mechanical gear box is prone to friction loss, lubrication and vibration noise and other problems, and is difficult to maintain and replace, and the large size low speed large torque motor is large in size, occupies more space, uses more materials, and results in increased manufacturing cost. SUMMARY
[0004] The utility model discloses a high torque density permanent magnet direct drive motor to solve the problems in the above background technology, realize the output of larger torque under smaller size, and improve the torque density of motor.
[0005] To achieve the above object, the utility model adopts the following technical scheme:
[0006] A high torque density permanent magnet direct drive motor, comprising an inner rotor and an outer stator, wherein:
[0007] The outer surface of the inner rotor is provided with a radial magnetization permanent magnet, and the permanent magnet is provided with M pairs of magnetic poles, so that the inner rotor generates M pairs of excitation magnetic field, and M is a positive integer.
[0008] The inner surface of the outer stator is provided with N stator slots, and each stator slot is provided with a winding, and the winding is a single-layer full-pitch winding, so that the outer stator generates a pair of armature magnetic field, and N=M+1.
[0009] As an optional scheme, the permanent magnet is tightly attached or nested on the outer surface of the inner rotor.
[0010] As an optional scheme, M=17, and N=18.
[0011] The utility model has the advantages of:
[0012] The high torque density permanent magnet direct drive motor simplifies the structure of the inner rotor and the outer stator, increases the pole ratio of the motor, increases the magnetic load of the motor, and thus increases the torque of the motor, that is, improves the torque density of the motor. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1It is the structural schematic view of the high-torque-density permanent magnet direct drive motor provided by the embodiment of the utility model.
[0014] In the drawings:
[0015] 1, inner rotor; 2, outer stator; 3, permanent magnet; 4, stator slot; 5, winding. DETAILED DESCRIPTION
[0016] The utility model will be further explained in detail in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all the structures.
[0017] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; 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 communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0018] In the utility model, unless otherwise explicitly specified and limited, the first feature is "on" or "below" the second feature, which can include the direct contact of the first and second features, or the contact of the first and second features through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0019] In the description of the embodiment, the terms "up", "down", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the utility model.
[0020] In addition, the terms "first", "second" and the like are only used to distinguish in description, and have no special meaning.
[0021] Please refer to Figure 1As shown, the embodiment provides a high torque density permanent magnet direct drive motor, comprising an inner rotor 1 and an outer stator 2, wherein:
[0022] The outer ring surface of the inner rotor 1 is provided with a radially magnetized permanent magnet 3, and the permanent magnet 3 is provided with M pairs of magnetic poles, so that the inner rotor 1 generates M pairs of excitation magnetic fields, and M is a positive integer;
[0023] The inner ring surface of the outer stator 2 is provided with N stator slots 4, and each stator slot 4 is provided with a winding 5, and the winding 5 is a single-layer full-pitch winding, so that the outer stator 2 generates a pair of pole armature magnetic field, N=M+1.
[0024] Optionally, the permanent magnet 3 is tightly attached or nested on the outer ring surface of the inner rotor 1.
[0025] The embodiment takes M=17, N=18 as an example, that is, the pole pair number pr of the inner rotor 1 is 17, the pole pair number ps of the outer stator 2 is 1, and the number of stator slots 4 N=pr+ps=18, which conforms to the magnetic field modulation principle.
[0026] Since the magnetic load B of the permanent magnet motor is approximately (pr / ps)*B1+B2, wherein B1 is the magnetic density amplitude of the modulation magnetic field, and B2 is the magnetic density amplitude of the fundamental magnetic field, the magnetic load of the motor can be increased by increasing the pole ratio (pr / ps) of the motor as much as possible, and the torque of the motor is positively correlated with the magnetic load, so the torque of the motor can be increased, that is, the torque density is higher.
[0027] Therefore, the structure of the gear reduction box can be omitted, the risk of gear reduction box failure can be avoided, the safety and reliability can be improved, the production cost can be reduced, the efficiency of the entire transmission system can be improved, the control accuracy of the motor can be improved, and the requirements of special working conditions such as robot joints can be met.
[0028] Obviously, the above-mentioned embodiments of the utility model are only examples for clearly explaining the utility model, and are not limited to the embodiments of the utility model. For ordinary skilled persons in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claims.
Claims
1. A high torque density permanent magnet direct drive motor, characterized by, It comprises an inner rotor (1) and an outer stator (2), wherein: The outer circle surface of the inner rotor (1) is provided with radially magnetized permanent magnets (3), and M pairs of magnetic poles are arranged on the permanent magnets (3), so that the inner rotor (1) generates M pairs of excitation magnetic fields, and M is a positive integer; The inner circle surface of the outer stator (2) is provided with N stator slots (4), and each stator slot (4) is provided with a winding (5), and the winding (5) is a single-layer full-pitch winding, so that the outer stator (2) generates a pair of armature magnetic fields, and N=M+1.
2. The high torque density permanent magnet direct drive electric motor of claim 1, wherein, The permanent magnets (3) are tightly attached or nested on the outer circle surface of the inner rotor (1).
3. The high torque density permanent magnet direct drive electric motor of claim 1, wherein, M=17, N=18.