Pole-changing permanent magnet motor rotor

Abstract

The invention relates to the technical field of motors, in particular to a pole-changing permanent magnet motor rotor. The rotor comprises a rotor iron core, a driving unit, magnetic poles and a transmission unit. A center hole, first holes and second holes are formed in the rotor iron core, the center hole is located in the center of one end of the rotor iron core, the first holes and the second holes are circumferentially distributed around the center hole, and the distribution number of the first holes and the second holes is an even number; the driving unit and the magnetic pole are respectively arranged in the first hole and the second hole; each transmission unit comprises a first transmission part and a second transmission part which are in mutual transmission, each magnetic pole is connected to each driving unit through the corresponding first transmission part and the corresponding second transmission part which are in mutual transmission, and every two adjacent first transmission parts are not connected with every two adjacent second transmission parts. The pole-changing permanent magnet motor rotor with the structure can realize pole changing.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a variable-pole permanent magnet motor rotor. Background Art

[0002] The variable-pole speed regulation technology is widely used in induction motors. The motor speed can be changed only by changing the number of poles of the stator winding, but the power factor is relatively low. Ordinary permanent magnet synchronous motors have the characteristics of high efficiency, high power factor and wide economic operation range, but it is difficult to change the polarity of the permanent magnet poles. The number of poles of the motor is fixed after being manufactured and cannot achieve pole change. Summary of the Invention

[0003] In order to solve the above technical problems, the object of the present invention is to provide a variable-pole permanent magnet motor rotor, and the variable-pole permanent magnet motor rotor with this structure can achieve pole change.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A variable-pole permanent magnet motor rotor, the rotor includes: A rotor core extending along the straight line L1, and a central hole, a first hole and a second hole are provided therein and penetrate along the straight line L1. The central hole is located at the center of one end of the rotor core. The first hole and the second hole are both circumferentially distributed around the central hole, and the distribution numbers of the first hole and the second hole are even; A driving unit, a plurality of the driving units are provided and are respectively arranged in the first holes, and the extension length of the driving unit along the straight line L1 is less than the extension length of the first hole; Magnetic poles, the shape and size of the end portions thereof are adapted to the second holes; a plurality of the magnetic poles are provided and are respectively arranged in the second holes, and the extension length of the magnetic poles along the straight line L1 is equal to the extension length of the second holes; And a transmission unit, which includes a first transmission member and a second transmission member that are mutually transmitted; the first transmission member is arranged at one end of the driving unit, and the second transmission member is arranged at one end of the magnetic pole close to the first transmission member; Wherein, a single magnetic pole is connected to a single driving unit through the mutually transmitted first transmission member and second transmission member, and adjacent two first transmission members and adjacent two second transmission members are not connected.

[0005] Preferably, the circumferential setting of the first hole is smaller than the circumferential setting of the second hole.

[0006] Preferably, the shape of the second hole is circular.

[0007] Preferably, both the first transmission member and the second transmission member adopt a gear structure.

[0008] Preferably, the magnetic poles can be integral magnetic steels, linear magnetic steels, V-shaped magnetic steels or U-shaped magnetic steels.

[0009] Preferably, the driving unit drives the magnetic poles to rotate, combining into rotors with different numbers of pole pairs, thereby forming one pair of poles, two pairs of poles or four pairs of poles to achieve pole changing.

[0010] In summary, the advantages of the present invention are as follows: The cylindrical magnetic poles are inserted into the second holes of the rotor core to form a rotor, and each magnetic pole is equipped with a driving unit. The driving unit is powered by a slip ring or a battery, and then drives the magnetic poles to rotate through a transmission unit, combining into rotors with different numbers of pole pairs, thereby achieving pole changing. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic structural diagram of this embodiment; Figure 2 is a schematic cross-sectional structural diagram of this embodiment; Figure 3 is a schematic structural diagram of one end of the transmission unit of this embodiment; Figure 4 is a schematic structural diagram of the end of this embodiment away from the transmission unit; Figure 5 is a schematic structural diagram of the rotor core; Figure 6 is a schematic structural diagram of four pairs of poles of this embodiment; Figure 7 is a schematic structural diagram of two pairs of poles of this embodiment; Figure 8 is a schematic structural diagram of one pair of poles of this embodiment; Reference numerals: 1, rotor core; 2, driving unit; 3, magnetic pole; 4, transmission unit; 11, central hole; 12, first hole; 13, second hole; 31, first transmission member; 32, second transmission member. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] Next, the technical solutions in the embodiments of the present application will be clearly and completely described 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 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.

[0013] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application 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, and therefore should not be construed as a limitation of the present application.

[0014] At the same time, it should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0015] The following will make a detailed description of the specific embodiments of the present invention in conjunction with the drawings.

[0016] As Figures 1 to 8 shown, a variable-pole permanent magnet motor rotor includes: a rotor core 1, a driving unit 2, magnetic poles 3, and a transmission unit 4.

[0017] The rotor core 1 extends along the direction of the straight line L1, and a central hole 11, a first hole 12, and a second hole 13 are provided therein and penetrate along the direction of the straight line L1. The central hole 11 is located at the center of one end of the rotor core 1. The first hole 12 and the second hole 13 are both circumferentially distributed around the central hole 11, and the number of distributions of the first hole 12 and the second hole 13 is even. Among them, the circumferential setting of the first hole 12 is smaller than the circumferential setting of the second hole 13, and the shape of the second hole 13 is circular.

[0018] A number of driving units 2 are provided and are respectively installed in the first holes 12. The extension length of the driving unit 2 along the direction of the straight line L1 is smaller than the extension length of the first holes 12.

[0019] The shape and size of the end of the magnetic pole 3 are adapted to the second hole 13. A number of magnetic poles 3 are provided and are respectively installed in the second holes 13. The extension length of the magnetic pole 3 along the direction of the straight line L1 is equal to the extension length of the second holes 13. A magnetic isolation bridge is provided on the rotor core 1 and the magnetic poles 3. Among them, the magnetic poles 3 are not limited to those shown in the figure and can be distributed as integral magnetic steels, one-word magnetic steels, V-shaped magnetic steels, etc.

[0020] The transmission unit 4 includes a first transmission member 31 and a second transmission member 32 that are mutually transmitted. The first transmission member 31 is installed on one end of the driving unit 2, and the second transmission member 32 is installed on one end of the magnetic pole 3 close to the first transmission member 31. Among them, the first transmission member 31 and the second transmission member 32 both adopt but are not limited to gear structures.

[0021] A single magnetic pole 3 is connected to a single driving unit 2 through a first transmission member 31 and a second transmission member 32 that are mutually driven, and there is no connection between two adjacent first transmission members 31 and between two adjacent second transmission members 32. Each magnetic pole 3 is provided with a driving unit 2, and the driving unit 2 is powered by a slip ring or a battery. The driving unit 2 drives the magnetic pole 3 to rotate, and different pole-pair rotors are combined. Thus, a pair of poles, two pairs of poles, or four pairs of poles can be formed to achieve pole change.

[0022] The above is the description of the embodiments of the present invention. Through the above description of the disclosed embodiments, those skilled in the art can implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather will conform to the widest scope consistent with the principles and novel points disclosed herein.

Claims

1. A pole-changing permanent magnet motor rotor, characterized in that: The rotor comprises: A rotor core (1) extends along a straight line L1, and is provided with a center hole (11), a first hole (12), and a second hole (13) extending through the center hole (11) along the straight line L1. The center hole (11) is located at the center of one end of the rotor core (1), and the first hole (12) and the second hole (13) are both distributed in a circle around the center hole (11), and the number of the first hole (12) and the second hole (13) is an even number. A driving unit (2), wherein a plurality of the driving units (2) are provided and are arranged one by one in the first hole (12), and an extension length of the driving unit (2) along the straight line L1 is smaller than an extension length of the first hole (12); The shape and size of the end of the magnetic pole (3) are adapted to the second hole (13); a plurality of magnetic poles (3) are provided and are arranged one by one in the second hole (13); the extension length of the magnetic pole (3) along the straight line L1 is equal to the extension length of the second hole (13); and a transmission unit (4), comprising a first transmission member (31) and a second transmission member (32) which transmit transmission to each other; the first transmission member (31) is arranged on one end of the drive unit (2), and the second transmission member (32) is arranged on one end of the magnetic pole (3) close to the first transmission member (31); Wherein, a single magnetic pole (3) is connected to a single drive unit (2) via a first transmission member (31) and a second transmission member (32) that transmit transmission to each other, and two adjacent first transmission members (31) and two adjacent second transmission members (32) are not connected to each other.

2. The pole-changing permanent magnet motor rotor according to claim 1, characterized in that: The setting circumference of the first hole (12) is smaller than the setting circumference of the second hole (13).

3. The pole-changing permanent magnet motor rotor according to claim 2, characterized in that: The second hole (13) is circular in shape.

4. The pole-changing permanent magnet motor rotor according to claim 1, characterized in that: The first transmission member (31) and the second transmission member (32) both adopt a gear structure.

5. The pole-changing permanent magnet motor rotor according to claim 1, characterized in that: The magnetic pole (3) can be a solid magnetic steel, a straight magnetic steel, a V-shaped magnetic steel or a U-shaped magnetic steel.

6. The pole-changing permanent magnet motor rotor according to claim 1, characterized in that: The driving unit (2) drives the magnetic poles (3) to rotate, thereby forming rotors with different numbers of pole pairs, thereby forming one pair of poles, two pairs of poles or four pairs of poles to achieve pole change.

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