Low-speed large-torque motor

Abstract

The low-speed large-torque motor comprises a stator and a rotor, the rotor is provided with at least one accommodating unit, the accommodating unit is symmetrically arranged about a symmetry axis, the symmetry axis is a center line penetrating through the center of the rotor in the radial direction, and the accommodating unit comprises a first accommodating cavity and a second accommodating cavity which are used for accommodating magnetic steel. The second containing cavity is located on the side, close to the peripheral edge of the rotor, of the first containing cavity in the radial direction of the rotor, the first containing cavity is provided with a first cavity part and a second cavity part which are communicated, and the first cavity part and the second cavity part are arranged in a V shape in the radial direction of the rotor. The communicating and connecting position of the first cavity part and the second cavity part is arranged close to the center of the rotor in the radial direction, the second containing cavity is in a linear shape in the radial direction of the rotor, and the two ends of the second containing cavity extend in the perpendicular direction of the symmetry axis. The magnetic force density and the torque can be improved, the torque fluctuation is reduced, and the rotating speed of the motor is stable.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and particularly relates to a low-speed high-torque motor. Background Art

[0002] At present, in the machinery manufacturing industry, systems such as machine tools, heavy mining machinery, construction machinery, electric power machinery, petroleum machinery, and ship propulsion that require low-speed high-torque transmission can adopt a drive mode of a speed reducer combined with a high-speed motor. However, this system has some disadvantages. On the one hand, due to mechanical reasons such as the gear transmission structure of the speed reducer, the overall transmission efficiency of the system is reduced; on the other hand, due to the presence of the speed reducer, the overall volume of the drive system is relatively large. Some equipment that requires low-speed high-torque transmission can also directly adopt a permanent magnet motor with low speed and high torque. Currently, the low-speed high-torque permanent magnet motors on the market generally have problems such as unstable speed and large torque fluctuations. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a low-speed high-torque motor, which can improve the magnetic force density, increase the torque, reduce the torque fluctuation, and make the motor speed stable.

[0004] A low-speed high-torque motor according to an embodiment of the first aspect of the utility model includes a stator and a rotor. The rotor has at least one accommodation unit. The accommodation unit is symmetrically arranged about a symmetry axis, and the symmetry axis is a center line passing through the center in the radial direction of the rotor. The accommodation unit includes a first accommodation cavity and a second accommodation cavity for accommodating magnetic steel. In the radial direction of the rotor, the second accommodation cavity is located on the side of the first accommodation cavity close to the outer peripheral edge of the rotor. The first accommodation cavity has a first cavity portion and a second cavity portion that communicate with each other. In the radial direction of the rotor, the first cavity portion and the second cavity portion are arranged in a V shape, and the communication intersection position of the first cavity portion and the second cavity portion is arranged close to the center in the radial direction of the rotor. In the radial direction of the rotor, the second accommodation cavity is arranged in a straight line, and both ends of the second accommodation cavity extend along the vertical direction of the symmetry axis.

[0005] A low-speed high-torque motor according to an embodiment of the utility model has at least the following beneficial effects:

[0006] By arranging the accommodation unit, which includes the first accommodation cavity and the second accommodation cavity, the first accommodation cavity and the second accommodation cavity are beneficial for accommodating more magnetic steel. The angle cooperation of the V-shaped magnetic steel and the straight-line magnetic steel helps to improve the magnetic force density, greatly reduce the cogging torque, and reduce the torque fluctuation. Compared with the traditional low-speed high-torque motor, the motor of the utility model has high manufacturing processability, high power density, and high control stability.

[0007] According to some embodiments of the present invention, the included angle formed between the first cavity portion and the second cavity portion is in the range of 108° - 126°.

[0008] According to some embodiments of the present invention, the ratio of the outer diameter of the stator to the outer diameter of the rotor is 1:0.55 - 0.75.

[0009] According to some embodiments of the present invention, the accommodating unit forms magnetic poles, the stator is provided with slots, and the number combination of the slots and the magnetic poles is one of 36 / 32, 36 / 40, 48 / 40.

[0010] According to some embodiments of the present invention, the magnet is one of concentric circular arc-shaped magnets or offset arc-shaped magnets.

[0011] According to some embodiments of the present invention, the rotor has tooth portions, coils are wound around the tooth portions, a slot is formed on one side of the tooth portions, and the coils are accommodated in the slots.

[0012] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0013] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, where:

[0014] Figure 1 is a schematic structural diagram of a low-speed high-torque motor according to an embodiment of the present invention;

[0015] Figure 2 is Figure 1 a schematic partial structural diagram of a low-speed high-torque motor shown.

[0016] Reference numerals: 100 - stator, 110 - rotor, 120 - accommodating unit, 130 - axis of symmetry, 140 - magnet, 150 - first accommodating cavity, 160 - second accommodating cavity, 170 - first cavity portion, 180 - second cavity portion, 190 - slot, 200 - tooth portion. Detailed Embodiments

[0017] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0018] In the description of the present utility model, it should be understood that with respect to the orientation description, such as the upper, lower, front, rear, left, right, etc., the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0019] In the description of the present utility model, the meaning of several is one or more, the meaning of multiple is two or more. Understandings such as greater than, less than, exceeding, etc. do not include the present number, and understandings such as above, below, within, etc. include the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0020] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0021] The following describes a low-speed high-torque motor according to an embodiment of the present utility model with reference to the drawings.

[0022] Refer to Figure 1 and Figure 2 As shown in [relevant figures], a low-speed high-torque motor according to an embodiment of the present utility model includes a stator 100 and a rotor 110. The rotor 110 has at least one accommodation unit 120. The accommodation unit 120 is symmetrically arranged about a symmetry axis 130, and the symmetry axis 130 is a center line passing through the center in the radial direction of the rotor 110. The accommodation unit 120 includes a first accommodation cavity 150 and a second accommodation cavity 160 for accommodating a permanent magnet 140. In the radial direction of the rotor 110, the second accommodation cavity 160 is located on the side of the first accommodation cavity 150 closer to the outer peripheral edge of the rotor 110. The first accommodation cavity 150 has a first cavity portion 170 and a second cavity portion 180 that are communicated. In the radial direction of the rotor 110, the first cavity portion 170 and the second cavity portion 180 are arranged in a V shape, and the communication intersection position of the first cavity portion 170 and the second cavity portion 180 is arranged close to the center in the radial direction of the rotor 110. In the radial direction of the rotor 110, the second accommodation cavity 160 is arranged in a straight line, and both ends of the second accommodation cavity 160 extend along the vertical direction of the symmetry axis 130.

[0023] In some embodiments of the present utility model, the included angle formed between the first cavity portion 170 and the second cavity portion 180 is in the range of 108° - 126°. This angle design is beneficial to reducing torque fluctuation and achieving a high rotor 110 flux.

[0024] In some embodiments of the present utility model, the ratio of the outer diameter of the stator 100 to the outer diameter of the rotor 110 is 1:0.55 - 0.75. Therefore, the outer diameters of the stator 100 and the rotor 110 with this ratio contribute to arranging the accommodating unit 120 and obtaining a relatively high magnetic force density.

[0025] In some embodiments of the present utility model, the accommodating unit 120 forms magnetic poles, and the stator 100 is provided with slots 190. The number combination of the slots 190 and the magnetic poles is one of 36 / 32, 36 / 40, 48 / 40.

[0026] Therefore, with this number combination of the slots 190 and the magnetic poles, the motor obtains a very low cogging torque and a high voltage coefficient and efficiency.

[0027] According to the design requirements of the motor, the permanent magnet 140 can be selected from a concentric circular arc-shaped permanent magnet 140 or an offset arc-shaped permanent magnet 140.

[0028] In some embodiments of the present utility model, the rotor 110 has tooth portions 200. Coils are wound around the tooth portions 200, and slots 190 are formed on one side of the tooth portions 200 to accommodate the coils.

[0029] A stator 100 of a low-speed high-torque motor of the present utility model has an outer diameter of 650 mm and a thickness of 80 mm. The stator 100 is provided with 36 slots 190, and the rotor 110 is a permanent magnet motor with 32 poles. The torque output by the motor is tested.

[0030] Moreover, through an electromagnetic design software, it is determined that the magnetic flux density is in the range of 0.85 - 1.25 T. The motor is subjected to a load test, and relevant data is measured using a rotational speed and torque measuring instrument. It can be seen that the present utility model can improve the magnetic force density, greatly reduce the cogging torque of the slots 190, and reduce torque fluctuation, as compared with traditional low-speed high-torque motors.

[0031] Moreover, the manufacturing processability of the motor of the present utility model is high, the power density of the motor is high, and the control stability is high.

[0032] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0033] The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art in the said technical field, various changes can be made without departing from the gist of the present utility model.

Claims

1. A low speed and high torque motor, characterized in that: The invention comprises a stator (100) and a rotor (110), wherein the rotor (110) has at least one accommodating unit (120), wherein the accommodating unit (120) is symmetrically arranged about a symmetry axis (130), wherein the symmetry axis (130) is a center line passing through the center of the rotor (110) in a radial direction, and wherein the accommodating unit (120) comprises a first accommodating cavity (150) and a second accommodating cavity (160) for accommodating a magnetic steel (140), wherein the second accommodating cavity (160) is located on the outer side of the first accommodating cavity (150) close to the rotor (110) in a radial direction of the rotor (110). On one side of the peripheral edge, the first accommodating cavity (150) has a first cavity portion (170) and a second cavity portion (180) that are connected. In the radial direction of the rotor (110), the first cavity portion (170) and the second cavity portion (180) are arranged in a V shape, and the connecting intersection position of the first cavity portion (170) and the second cavity portion (180) is arranged close to the center of the rotor (110) in the radial direction. In the radial direction of the rotor (110), the second accommodating cavity (160) is in a straight shape, and both ends of the second accommodating cavity (160) extend in a direction perpendicular to the symmetry axis (130).

2. A low speed and high torque motor according to claim 1, characterized in that: An included angle formed between the first cavity portion (170) and the second cavity portion (180) is in the range of 108°-126°.

3. A low speed and high torque motor according to claim 1, characterized in that: The ratio of the outer diameter of the stator (100) to the outer diameter of the rotor (110) is 1:0.55-0.

75.

4. A low speed and high torque motor according to claim 1, characterized in that: The accommodating unit (120) forms a magnetic pole, the stator (100) is provided with a slot (190), and the number of the slot (190) and the magnetic pole is matched to one of 36 / 32, 36 / 40, and 48 / 40.

5. A low speed and high torque motor according to claim 4, characterized in that: The rotor (110) has a tooth portion (200), a coil is wound around the tooth portion (200), and a slot (190) is formed on one side of the tooth portion (200), and the slot (190) accommodates the coil.

6. A low speed and high torque motor according to claim 1, characterized in that: The magnetic steel (140) is one of a concentric tile-shaped magnetic steel (140) or a biased tile-shaped magnetic steel (140).

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