CN215580592U - Squirrel-cage rotor for three-phase two-stage permanent magnet synchronous motor - Google Patents
Squirrel-cage rotor for three-phase two-stage permanent magnet synchronous motor Download PDFInfo
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- CN215580592U CN215580592U CN202121587657.4U CN202121587657U CN215580592U CN 215580592 U CN215580592 U CN 215580592U CN 202121587657 U CN202121587657 U CN 202121587657U CN 215580592 U CN215580592 U CN 215580592U
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Abstract
The utility model discloses a squirrel-cage rotor for a three-phase two-stage permanent magnet synchronous motor, which comprises a core body and a squirrel-cage winding arranged on the core body in a matching way, and is characterized in that: the magnetic steel piece filling device is characterized in that four cavities are arranged in the core body, the filled magnetic steel pieces are contained in the cavities, N-pole magnetic steel pieces are filled in two adjacent cavities, S-pole magnetic steel pieces are filled in the other two adjacent cavities, and a magnetic separation bridge is arranged between the cavities filled with the same-pole magnetic steel pieces. The utility model optimizes the structure of the rotor assembly through optimized design, and improves the running balance of the motor by reducing the stray loss of the motor, thereby increasing the starting traction torque.
Description
Technical Field
The utility model relates to the technical field of synchronous motors, in particular to a self-starting three-phase two-stage permanent magnet synchronous motor.
Background
In recent years, permanent magnet synchronous motors have been developed more rapidly, and are characterized by high power factor and high efficiency, and the permanent magnet synchronous motors gradually replace the most common alternating current asynchronous motors in many occasions. The permanent magnet synchronous motor is generally composed of a stator, a rotor, an end cover, a machine body and other components, the structure of the stator is generally the same as that of a common induction motor, and a falling structure is generally adopted to reduce iron loss during the operation of the motor. The rotor core is usually of a solid structure, and can also be formed by lamination. The permanent magnet synchronous motor is different from other motors in the magnetic structure of a rotor, so that the running performance, a control system, a manufacturing process and a use occasion of the permanent magnet synchronous motor are different.
The rotor magnetic circuit structure of the permanent magnet synchronous motor can be divided into a surface type rotor magnetic circuit structure, and the structure is simple in design and manufacturing process, low in cost, wide in application and particularly suitable for rectangular wave permanent magnet synchronous motors. But the rotating surface can not be provided with a starting winding, has no asynchronous starting capability and can not be used for asynchronously starting the permanent magnet synchronous motor; in addition, the permanent magnet rotor comprises a convex permanent magnet rotor, a cage-type winding permanent magnet rotor, a built-in rotor magnetic circuit structure and the like.
The existing permanent magnet synchronous motor reflects the synchronous rotating speed of the motor according to the number of magnetic poles, the 2-pole synchronous rotating speed is 3000r/min, the 4-pole synchronous rotating speed is 1500r/min, the number of the magnetic poles is the number of the magnetic poles formed after the motor winding is electrified, the magnetic poles are divided into four poles, namely 2 poles, 4 poles, 6 poles, 8 poles and the like, the rotating speeds output at different levels are different, and the rotating speed of the permanent magnet synchronous motor is equal to the frequency (50 Hz) 60/pole logarithm theoretically. Namely 3000 rpm for a 2 pole motor, 1500 rpm for a 4 pole, 1000 rpm for a 6 pole, and 750 rpm for an 8 pole.
If the frequency of the three-phase alternating current is 50Hz, the synchronous rotating speed of the synthetic magnetic field is 50r/s, namely 3000r/min, if the rotating magnetic field of the motor is not only a pair of magnetic poles, the relationship between the synchronous rotating speed n and the magnetic pole pair number p of the magnetic field can be obtained through further analysis: n =60f/p.f is frequency, in hz.n, in r/min. ns has a strict relation with the frequency (f) of the alternating current and the pole pair number (P) of the motor, and ns = f/P.
Therefore, when selecting the motor, it is necessary to consider how much starting torque is loaded, for example, the torque for starting with a load is larger than the torque for starting without load. However, under the condition of constant power, the larger the rotation speed is, the smaller the torque corresponding to the motor is, so that the existing two-stage permanent magnet synchronous motor can meet more no-load operation requirements, but in the actual use process, after the load is completed, the torque of load starting cannot meet the existing use requirements generally.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a squirrel cage rotor for a three-phase two-stage permanent magnet synchronous motor, which is used for solving the technical problems, optimizing the structure of a rotor component, and improving the running balance of the motor by reducing the stray loss of the motor so as to increase the starting traction torque.
The technical problem solved by the utility model can be realized by adopting the following technical scheme:
the squirrel cage rotor comprises a core body and squirrel cage windings installed on the core body in a matching mode, four cavities are formed in the core body, filled magnetic steel pieces are contained in the cavities, N-pole magnetic steel pieces are filled in two adjacent cavities, S-pole magnetic steel pieces are filled in the other two adjacent cavities, and magnetic bridges are arranged between the cavities filled with the same-pole magnetic steel pieces.
And magnetic isolation gaps are formed between the two ends of the magnetic steel piece filled in the cavity and the inner wall of the cavity.
The squirrel-cage winding comprises a rotor unit, a rotor groove is formed in the periphery of the rotor unit, a guide bar part is filled and poured in the rotor groove, and a squirrel-cage end ring is arranged on the rotor unit in an axially and outwards extending mode.
The guide strip part and the squirrel cage end ring are formed by integrally pouring the same materials.
The axial length dimension of the squirrel cage end ring is 2 times or more than the radial thickness dimension of the squirrel cage end ring.
The included angle between two adjacent cavities for filling the N-pole magnetic steel pieces is 95-100 degrees, the included angle between two adjacent cavities for respectively filling the N-pole magnetic steel pieces and the S-pole magnetic steel pieces is 80-85 degrees, and the four cavities are arranged at intervals in a rhombic shape.
The thickness of the magnetic isolation bridge is 0.8 mm-1.2 mm.
The thickness dimension of the magnetic isolation bridge is 1.0 mm.
The quantity of the magnetic steel pieces in a single cavity is 1-5 pieces and arranged in the same pole, and the magnetic steel pieces are made of neodymium iron boron magnetic steel materials.
The number of the magnetic steel pieces in a single cavity is 2-4, and the magnetic steel pieces are arranged in the same pole.
Compared with the prior art, the utility model has the following outstanding advantages and effects: the utility model optimizes the structure of the rotor assembly through optimized design, and improves the running balance of the motor by reducing the stray loss of the motor, thereby increasing the starting traction torque.
The features of the present invention will be apparent from the accompanying drawings and from the detailed description of the preferred embodiments which follows.
Drawings
FIG. 1 is a first schematic sectional view of the present invention;
FIG. 2 is a schematic overall sectional view of the present invention;
FIG. 3 is a schematic diagram of a chamber structure according to the present invention;
FIG. 4 is a partial structural view of a rotor unit according to the present invention;
wherein, 1, the core body; 2. a magnetic steel member; 3. a squirrel cage winding; 31. a bar guiding part; 32. a squirrel cage end ring; 33. a rotor unit; 34. a rotor groove; 4. a cavity; 41. a magnetic isolation gap; 5. and a magnetic isolation bridge.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the utility model easy to understand, the utility model is further explained below by combining the specific drawings.
Referring to fig. 1 to 4, the squirrel cage rotor for the three-phase two-stage permanent magnet synchronous motor provided in this embodiment is used to form a permanent magnet motor with an inner rotor structure in cooperation with a stator; the squirrel-cage magnetic steel cage comprises a core body 1 and a squirrel-cage winding 3 which is installed on the core body 1 in a matching mode, wherein four cavities 4 are formed in the core body 1, filled magnetic steel pieces 2 are contained in the cavities 4, N-pole magnetic steel pieces 2 are filled in two adjacent cavities 4, S-pole magnetic steel pieces 2 are filled in the other two adjacent cavities 4, and a magnetic isolation bridge 5 is arranged between the cavities 4 filled with the same-pole magnetic steel pieces 2; the design of a built-in rotor magnetic circuit structure is adopted, the magnetic steel piece 2 is positioned in the rotor, a pole shoe made of ferromagnetic substances is arranged between the outer surface of the magnetic steel piece 2 and the stator, the pole shoe is arranged by adopting a squirrel cage winding, and preferably a cast aluminum cage; the structure plays a role in damping or starting, particularly increases starting and steady-state effects, adopts a structural design of a built-in magnetic steel piece, is protected by a pole shoe formed by a squirrel-cage winding arranged outside, and helps to improve the power density of the motor due to the reluctance torque generated by the asymmetry of a rotor magnetic circuit structure.
The structure is a two-stage permanent magnet synchronous motor, four cavities 4 are optimized, the magnetic steel pieces 2 which are assembled in the same pole by the cavities are adopted, the structures which are arranged in a rhombic shape are combined by two groups of designs, magnetic poles are optimized, and the efficiency is improved.
Preferably, a magnetic isolation gap 41 is formed between each of two ends of the magnetic steel piece 2 filled in the cavity 4 and the inner wall of the cavity, and the size of the magnetic isolation gap 41 is 0.8 mm-1.2 mm, preferably 1.0 mm.
Preferably, the squirrel-cage winding 3 comprises a rotor unit 33, a rotor groove 34 is formed in the periphery of the rotor unit 33, a conducting bar part 31 is filled and poured in the rotor groove 34, the rotor unit 33 is provided with a squirrel-cage end ring 32 in an axially outward extending mode, the conducting bar part 31 and the squirrel-cage end ring 32 are formed by integrally pouring same materials, and the axial length dimension of the squirrel-cage end ring 32 is 2 times or more of the radial thickness dimension of the squirrel-cage end ring 32; the axial length size and radial thickness size proportion of the squirrel cage end ring are optimally designed, the purpose is to increase the whole area of the squirrel cage end ring, the purpose is to further reduce the resistance of the end ring, and the traction torque is increased during starting, so that the loaded starting can be realized.
Preferably, the included angle between two adjacent cavities 4 for filling the N-pole magnetic steel piece 2 is 95-100 degrees, the included angle between two adjacent cavities 4 for respectively filling the N-pole magnetic steel piece 2 and the S-pole magnetic steel piece 2 is 80-85 degrees, and the four cavities 4 are arranged at intervals in a rhombus shape; the arrangement structure of the cavity 4 is optimized, so that a maximized effective magnetic circuit design can be formed, and the overall operation performance of the motor is improved.
Preferably, the thickness dimension of the magnetism isolating bridge 5 is 0.8 mm-1.2 mm, preferably, the thickness dimension of the magnetism isolating bridge 5 is 1.0mm, the optimization design is adopted, and the good magnetism isolating effect is realized under the condition that the good mechanical structure strength is ensured.
Preferably, the number of the magnetic steel pieces 2 in a single cavity is 1-5 pieces and arranged in the same pole, the magnetic steel pieces 2 are made of neodymium iron boron magnetic steel, and the number of the magnetic steel pieces in the single cavity is 2-4 pieces and arranged in the same pole.
The utility model optimizes the structure of the rotor assembly through optimized design, and improves the running balance of the motor by reducing the stray loss of the motor, thereby increasing the starting traction torque.
It will be appreciated by those skilled in the art that the utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the utility model are intended to be embraced therein.
Claims (10)
1. The utility model provides a squirrel cage rotor for three-phase second grade PMSM, includes that core and cooperation are installed squirrel cage winding on the core, its characterized in that: the magnetic steel piece filling device is characterized in that four cavities are arranged in the core body, the filled magnetic steel pieces are contained in the cavities, N-pole magnetic steel pieces are filled in two adjacent cavities, S-pole magnetic steel pieces are filled in the other two adjacent cavities, and a magnetic separation bridge is arranged between the cavities filled with the same-pole magnetic steel pieces.
2. The squirrel-cage rotor for the three-phase two-stage permanent magnet synchronous motor according to claim 1, wherein: and magnetic isolation gaps are formed between the two ends of the magnetic steel piece filled in the cavity and the inner wall of the cavity.
3. The squirrel-cage rotor for the three-phase two-stage permanent magnet synchronous motor according to claim 1, wherein: the squirrel-cage winding comprises a rotor unit, a rotor groove is formed in the periphery of the rotor unit, a guide bar part is filled and poured in the rotor groove, and a squirrel-cage end ring is arranged on the rotor unit in an axially and outwards extending mode.
4. The squirrel-cage rotor for the three-phase two-stage permanent magnet synchronous motor according to claim 3, wherein: the guide strip part and the squirrel cage end ring are formed by integrally pouring the same materials.
5. The squirrel-cage rotor for the three-phase two-stage permanent magnet synchronous motor according to claim 4, wherein: the axial length dimension of the squirrel cage end ring is 2 times or more than the radial thickness dimension of the squirrel cage end ring.
6. The squirrel-cage rotor for the three-phase two-stage permanent magnet synchronous motor according to claim 1, wherein: the included angle between two adjacent cavities for filling the N-pole magnetic steel pieces is 95-100 degrees, the included angle between two adjacent cavities for respectively filling the N-pole magnetic steel pieces and the S-pole magnetic steel pieces is 80-85 degrees, and the four cavities are arranged at intervals in a rhombic shape.
7. The squirrel-cage rotor for the three-phase two-stage permanent magnet synchronous motor according to claim 1, wherein: the thickness of the magnetic isolation bridge is 0.8 mm-1.2 mm.
8. The squirrel-cage rotor for the three-phase two-stage permanent magnet synchronous motor according to claim 7, wherein: the thickness dimension of the magnetic isolation bridge is 1.0 mm.
9. The squirrel-cage rotor for the three-phase two-stage permanent magnet synchronous motor according to claim 1, wherein: the quantity of the magnetic steel pieces in a single cavity is 1-5 pieces and arranged in the same pole, and the magnetic steel pieces are made of neodymium iron boron magnetic steel materials.
10. The squirrel-cage rotor for a three-phase two-stage permanent magnet synchronous motor according to claim 9, wherein: the number of the magnetic steel pieces in a single cavity is 2-4, and the magnetic steel pieces are arranged in the same pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121587657.4U CN215580592U (en) | 2021-07-13 | 2021-07-13 | Squirrel-cage rotor for three-phase two-stage permanent magnet synchronous motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121587657.4U CN215580592U (en) | 2021-07-13 | 2021-07-13 | Squirrel-cage rotor for three-phase two-stage permanent magnet synchronous motor |
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| CN215580592U true CN215580592U (en) | 2022-01-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116317246A (en) * | 2023-03-14 | 2023-06-23 | 浙江海川电气科技有限公司 | Rotor punching sheet of auxiliary magnetic reluctance motor |
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2021
- 2021-07-13 CN CN202121587657.4U patent/CN215580592U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116317246A (en) * | 2023-03-14 | 2023-06-23 | 浙江海川电气科技有限公司 | Rotor punching sheet of auxiliary magnetic reluctance motor |
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