A permanent magnet arc-shaped motor with dual-sided axial compensation

Abstract

A permanent magnet arc-shaped motor employing dual-sided axial compensation belongs to the field of electromechanical technology. The permanent magnet arc-shaped motor includes a rotor and at least one arc-shaped stator; the arc-shaped stator includes a radial stator core, a radial main winding, a dual-sided axial compensation device, and a stator connection structure. The dual-sided axial compensation device includes dual-sided axial cores and dual-sided axial compensation windings; the rotor includes rotor magnets and a rotor core; the radial main winding is fixedly mounted on the radial stator core, and the radial stator core is fixedly connected to the stator connection structure. Symmetrical dual-sided axial cores are installed on the empty spaces on both sides of the radial main winding ends, and the dual-sided axial cores are fixedly connected to the stator connection structure. Dual-sided axial compensation windings are symmetrically fixed on the dual-sided axial cores. An air gap is provided between the dual-sided axial cores and the rotor magnets, and the rotor magnets are fixedly mounted on the outer surface of the rotor core. This invention improves the utilization rate of the winding end space and enhances the output torque characteristics of the arc-shaped motor through the dual-sided axial compensation device.

Description

Technical Field

[0001] This invention belongs to the field of electromechanical technology, and specifically relates to a permanent magnet arc motor that uses double-sided axial compensation to improve the torque characteristics of the motor. Background Technology

[0002] Permanent magnet arc motors are characterized by simple structure, fast dynamic response, high torque density, and direct drive, and are widely used in fields such as astronomical observation, defense weapons, robotics, and mining.

[0003] Permanent magnet arc motors are typically used in applications requiring large diameters and low speeds, such as astronomical telescopes and radar. Currently used arc motors (such as...) Figure 3 As shown, the characteristics of an arc-shaped motor are: a larger outer diameter and a smaller axial length. The axial length occupied by the end windings on both sides of the arc-shaped motor is often greater than the axial length of the motor core. The relatively long winding ends result in a large waste of internal space, low space utilization, and low torque density. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned problems existing in the prior art by providing a permanent magnet arc motor with dual-sided axial compensation.

[0005] The novel permanent magnet arc-shaped motor structure proposed in this invention can improve the utilization rate of the winding end space through a double-sided axial compensation device; improve the output torque characteristics of the arc-shaped motor; in addition, the double-sided axial compensation device can also widen the speed operating range by using a field weakening method, which helps to adjust the output torque and speed characteristics of the motor.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A permanent magnet arc-shaped motor with dual-sided axial compensation includes a rotor and at least one arc-shaped stator. The arc-shaped stator includes a radial stator core, a radial main winding, a dual-sided axial compensation device, and a stator connection structure. The dual-sided axial compensation device includes a dual-sided axial core and a dual-sided axial compensation winding. The rotor includes a rotor magnet and a rotor core. The radial main winding is fixedly mounted on the radial stator core, and the radial stator core is fixedly connected to the stator connection structure. Symmetrical dual-sided axial cores are installed on the empty spaces on both sides of the radial main winding ends. The dual-sided axial cores are fixedly connected to the stator connection structure. Dual-sided axial compensation windings are symmetrically fixed on the dual-sided axial cores. An air gap is provided between the dual-sided axial cores and the rotor magnets. The rotor magnets are fixedly mounted on the outer surface of the rotor core.

[0008] Furthermore, the rotor magnet is a surface-mounted magnet, and each pole of the surface-mounted magnet is divided into three segments; the middle magnetized in the radial direction is the radial main magnet, and the two outer magnetized in the axial direction are the axial compensation magnets; when the radial main magnet is magnetized in the radial direction outward, the magnetization direction of the two outer axial compensation magnets is also axial outward; when the radial main magnet is magnetized in the radial direction inward, the magnetization direction of the two outer axial compensation magnets is also axial inward.

[0009] Furthermore, the rotor magnet has a magnetically concentrated structure, which includes radial main magnets and magnetically concentrated blocks. The N and S poles of the radial main magnets are circumferentially magnetized and arranged opposite each other. A magnetically concentrated block is placed between the N and S poles of the radial main magnets. The radial main magnets and magnetically concentrated blocks are arranged alternately with a pole pitch of radial main magnet N pole → magnetically concentrated block → radial main magnet S pole → magnetically concentrated block.

[0010] Furthermore, there are multiple arc-shaped stators, which are evenly distributed along the circumference of the rotor core.

[0011] Furthermore, the number of the arc-shaped stators is one.

[0012] Furthermore, the arc width of the arc-shaped stator is (n+1 / 2) times the pole pitch, where n is any positive integer.

[0013] Furthermore, the distance between two adjacent arc-shaped stators is (n±1 / m) times the pole pitch, where n is any positive integer and m is the number of arc-shaped stators.

[0014] Furthermore, the number of slots in the dual-sided axial core and the distribution of the dual-sided axial compensation windings are the same as the number of slots in the radial stator core and the distribution of the radial main windings in the main magnetic circuit.

[0015] Furthermore, a magnetic isolation core is provided between the radial main magnet and the axial compensating magnet.

[0016] Furthermore, both ends of the arc-shaped stator are fixed with outer baffles.

[0017] The advantages of this invention over the prior art are:

[0018] 1. Compared with conventional permanent magnet arc motors, the permanent magnet arc motor with double-sided axial compensation proposed in this invention can improve the space utilization rate at the end of the radial main winding; when the same current as the radial main winding is applied to the double-sided axial compensation winding, the space utilization rate at the end of the radial main winding can be improved; the output torque is increased, and the output torque characteristics of the arc motor are improved.

[0019] 2. When a current opposite to that of the radial main winding is applied, it can weaken the magnetic field. By weakening the magnetic field, the operating speed range can be widened, which helps to adjust the output torque and speed characteristics of the motor.

[0020] 3. A rotor magnetizing structure was proposed, in which the N and S poles are circumferentially magnetized and arranged opposite each other, with a magnetizing block in the middle, which increases the air gap magnetic flux density and the torque density of the motor.

[0021] 4. The permanent magnet arc motor with dual-sided axial compensation proposed in this invention can improve the torque characteristics of the permanent magnet arc motor from the motor body structure. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a permanent magnet arc-shaped motor with dual-sided axial compensation according to the present invention;

[0023] Figure 2 This is a cross-sectional view of a permanent magnet arc-shaped motor with dual-sided axial compensation according to the present invention;

[0024] Figure 3 A schematic diagram of a permanent magnet arc motor without dual-sided axial compensation devices;

[0025] Figure 4 This is a schematic diagram of the structure of the double-sided axial compensation device of the present invention;

[0026] Figure 5 This is a schematic diagram showing the structure and magnetization direction of the rotor magnet;

[0027] Figure 6 This is a schematic diagram of the rotor magnet structure, where: Figure 6 (a) is a schematic diagram of the three-dimensional structure of a surface-mounted magnet; Figure 6 (b) is a schematic diagram of a rotor magnet with a magnetic focusing structure;

[0028] Figure 7 This is a schematic diagram showing the auxiliary winding and the radial winding connected in reverse series.

[0029] The component names and reference numerals in the above figures are summarized below:

[0030] 1-Radial stator core, 2-Double-sided axial core, 3-Radial main winding, 4-Double-sided axial compensation winding, 5-Radial main magnet, 6-Rotor core, 7-Axial compensation magnet, 8-Stator connection structure, 9-Outer baffle, 10-Magnet isolation core, 11-Magnetic block, 12-Double-sided axial core connection structure. Detailed Implementation

[0031] Specific implementation method one: as follows Figure 1 , Figure 2As shown, this embodiment discloses a permanent magnet arc-shaped motor with dual-sided axial compensation, including a rotor and at least one arc-shaped stator; the arc-shaped stator includes a radial stator core 1, a radial main winding 3, a dual-sided axial compensation device and a stator connection structure 8, the dual-sided axial compensation device includes a dual-sided axial core 2 and a dual-sided axial compensation winding 4; the rotor includes a rotor magnet and a rotor core 6; the radial main winding 3 (which is an arc-shaped stator winding) is fixedly mounted on the radial stator core 1, the radial stator core 1 is fixedly connected to the stator connection structure 8, symmetrical dual-sided axial cores 2 are added to the empty positions on both sides of the ends of the radial main winding 3, the dual-sided axial cores 2 are fixedly connected to the stator connection structure 8, the dual-sided axial compensation windings 4 are symmetrically fixedly mounted on the dual-sided axial core connection structure 12 of the dual-sided axial core 2, an air gap (an axial air gap) is provided between the dual-sided axial core 2 and the rotor magnet, and the rotor magnet is fixedly mounted on the outer surface of the rotor core 6. There are two structural forms of rotor magnets:

[0032] Structure Form 1: The rotor magnet is a surface-mounted magnet, with each pole of the surface-mounted magnet divided into three segments; the middle magnetized radially is the radial main magnet 5, and the two outer magnetized axially are the axial compensating magnets 7 (see schematic diagram of rotor magnet structure and magnetization direction as shown). Figure 5 and Figure 6 (a) When the magnetization direction of the radial main magnet 5 is radially outward, the magnetization direction of the axial compensating magnets 7 on both sides is axially outward; when the magnetization direction of the radial main magnet 5 is radially inward, the magnetization direction of the axial compensating magnets 7 on both sides is axially inward (the radial main magnet 5 and the axial compensating magnet 7 are arranged on the outer surface of the rotor core 6 according to this rule).

[0033] The double-sided axial core 2 serves to position and support the rotor, maintains an appropriate air gap between the double-sided axial compensation device and the rotor's axial compensation magnet 7, and provides a magnetic circuit flow channel inside the double-sided axial compensation device.

[0034] A three-phase symmetrical current is passed through the radial main winding 3, consistent with the drive configuration of a conventional arc-shaped motor. The same current is passed through the dual-axial compensation winding 4 in the dual-axial compensation device, which generates an additional torque, thereby improving the utilization rate of the end space of the radial main winding 3 and enhancing the output torque characteristics of the arc-shaped motor.

[0035] When a current opposite to that in the radial main winding 3 is passed through the dual-axial compensation winding 4, the dual-axial compensation winding 4 and the radial main winding 3 interact to produce a weak magnetic effect. The weak magnetic effect widens the speed operating range and helps to adjust the output torque and speed characteristics of the motor.

[0036] In this invention, the auxiliary winding (A) and auxiliary winding (B) (i.e., the double-sided axial compensation winding 4) are connected in reverse series with the radial winding (i.e., the radial main winding 3), as shown below. Figure 7 As shown, the induced electromotive force generated by the auxiliary winding and the radial winding can be made to be in opposite directions, which effectively reduces the value of the DC bus voltage. Reducing the DC bus voltage can effectively shrink the size of the driver and reduce costs.

[0037] Furthermore, a magnetic isolation core 10 is provided between the radial main magnet 5 and the axial compensating magnet 7, such as... Figure 6 As shown in (a).

[0038] Structure Form Two: The rotor magnet is a magnetizing structure, comprising radial main magnets 5 and magnetizing blocks 11. The N and S poles of the radial main magnets 5 are circumferentially magnetized and arranged opposite each other. Magnetizing blocks 11 are placed between the N and S poles of the radial main magnets 5. The radial main magnets 5 and magnetizing blocks 11 are arranged alternately with a pole pitch of radial main magnet 5 N pole → magnetizing block 11 → radial main magnet 5 S pole → magnetizing block 11, as shown below. Figure 6 As shown in (b).

[0039] The use of this magnetically focused structure in the rotor magnets further improves the utilization rate of the space at the ends of the radial main winding 3 and the magnetic flux utilization rate of the permanent magnet, providing additional reluctance torque and increasing the torque density of the arc-shaped permanent magnet motor. Because this magnetically focused effect eliminates the need for double-sided axial compensation magnets 7, the radial length of the rotor magnets is further reduced; the magnetically focused effect increases the air gap magnetic flux density of the motor, with the magnetic circuit flowing radially and axially at both ends, and the additional reluctance torque enhances the overall torque density of the arc-shaped motor.

[0040] This configuration increases the air gap magnetic flux density, effectively improving the motor's torque density. The rotor's magnetically focused structure provides a new path for the magnetic field, and the magnetic circuit can be divided into a radial magnetic circuit and an axial magnetic circuit. This magnetic circuit provides additional reluctance torque, increasing the torque density of the arc-shaped permanent magnet motor. Therefore, the permanent magnet arc-shaped motor with dual-sided axial compensation of this invention can improve the torque characteristics of the permanent magnet arc-shaped motor.

[0041] Furthermore, there are multiple arc-shaped stators, which are evenly distributed along the circumference of the rotor core 6.

[0042] Furthermore, the number of the arc-shaped stators is one.

[0043] Furthermore, the arc width of the arc-shaped stator is (n+1 / 2) times the pole pitch, where n is any positive integer.

[0044] The stator of an arc-shaped motor has two ends due to its structural characteristics, which causes distortion of the air gap reluctance at the ends and produces a severe edge effect. The edge effect generates a large edge torque when the arc-shaped motor is running, resulting in a large output torque pulsation. When the center angle of the arc-shaped stator is adjusted to (n+1 / 2) times the pole pitch, the fundamental components of the edge torque generated at the two ends of the arc-shaped stator can be mutually canceled, suppressing the fundamental component of the edge torque and significantly suppressing the output torque pulsation of the arc-shaped motor.

[0045] Furthermore, when there are multiple arc-shaped stators, the distance between two adjacent arc-shaped stators is (n±1 / m) times the pole pitch, where n is any positive integer and m is the number of arc-shaped stators.

[0046] The stator edge effect of an arc-shaped motor generates a large edge torque, which can be suppressed by adjusting the stator center angle. When an arc-shaped motor uses multiple arc-shaped stators spliced ​​together, the second harmonic components of the edge torque of each arc-shaped stator will superimpose, forming a large torque pulsation. When the distance between each stator is (n±1 / m) times the pole pitch (m is the number of arc-shaped stators), the superposition of the second harmonic components of the edge torque of each arc-shaped stator cancels each other out, further suppressing the edge torque and thus further suppressing the output torque pulsation of the arc-shaped motor, improving the output torque characteristics of the arc-shaped motor.

[0047] Furthermore, the number of slots in the double-sided axial core 2 and the distribution of the double-sided axial compensation winding 4 are the same as the number of slots in the radial stator core 1 and the distribution of the radial main winding 3 in the main magnetic circuit.

[0048] The identical distribution of the radial main winding 3 and the dual-axial compensation winding 4 facilitates the application of excitation current and the switching of compensation functions. When the dual-axial compensation device is needed to increase output torque, the output torque can be increased by passing a current in the same phase as the radial main winding 3 through the dual-axial compensation winding 4, or by connecting the phases of the dual-axial compensation winding 4 and the radial main winding 3 in forward series, thus improving the output torque characteristics of the arc-shaped motor. When the dual-axial compensation device is needed to weaken the field, the field weakening effect can be achieved by passing a current in the opposite phase to the radial main winding 3 through the dual-axial compensation winding 4, or by connecting the phases of the dual-axial compensation winding 4 and the radial main winding 3 in reverse series. Using field weakening widens the operating speed range and helps adjust the motor's output torque and speed characteristics. In summary, the identical distribution of the radial main winding 3 and the dual-axial compensation winding 4 facilitates the application of excitation current and makes it easier to switch the function of the dual-axial compensation device.

[0049] Furthermore, both ends of the arc-shaped stator are fixed with outer baffles 9.

[0050] This invention employs a dual-sided axial compensation device, which improves the torque characteristics of a permanent magnet arc-shaped motor, forming a novel permanent magnet arc-shaped motor structure. Conventional permanent magnet arc-shaped motors often have winding end lengths greater than core lengths, resulting in low space utilization. By adding a dual-sided axial compensation device to the unused space at the winding ends, comprising a dual-sided axial core 2 and a dual-sided axial compensation winding 4, the utilization rate of the space at the ends of the radial main winding 3 can be improved, thus enhancing the output torque characteristics of the arc-shaped motor. Furthermore, the dual-sided axial compensation device can also widen the operating speed range through field weakening, which helps to adjust the motor's output torque and speed characteristics.

[0051] This invention proposes a permanent magnet arc-shaped motor with dual-sided axial compensation. The dual-sided axial compensation winding 4 has the same distribution as the radial main winding 3. When a current with the same phase as that in the radial main winding 3 is applied, the utilization rate of the end space of the radial main winding 3 can be improved, thus improving the output torque characteristics of the arc-shaped motor. When a current with the opposite phase to that in the radial main winding 3 is applied, it can weaken the magnetic field, widening the operating speed range and helping to adjust the output torque and speed characteristics of the motor. When a rotor magnetizing structure is adopted, the magnetic circuit provides additional reluctance torque, increasing the torque density of the arc-shaped permanent magnet motor. Therefore, this invention, with its novel dual-sided axial compensation permanent magnet arc-shaped motor, can improve the torque characteristics of permanent magnet arc-shaped motors.

[0052] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A permanent magnet arc-shaped motor employing dual-sided axial compensation, characterized in that: The device includes a rotor and at least one arc-shaped stator; the arc-shaped stator includes a radial stator core (1), a radial main winding (3), a double-sided axial compensation device and a stator connection structure (8), the double-sided axial compensation device includes a double-sided axial core (2) and a double-sided axial compensation winding (4); the rotor includes a rotor magnet and a rotor core (6); the radial main winding (3) is fixedly mounted on the radial stator core (1), the radial stator core (1) is fixedly connected to the stator connection structure (8), symmetrical double-sided axial cores (2) are added to the empty positions on both sides of the radial main winding (3), the double-sided axial cores (2) are fixedly connected to the stator connection structure (8), the double-sided axial compensation windings (4) are symmetrically fixedly mounted on the double-sided axial cores (2), an air gap is provided between the double-sided axial cores (2) and the rotor magnet, and the rotor magnet is fixedly mounted on the outer surface of the rotor core (6).

2. A permanent magnet arc-shaped motor with dual-sided axial compensation as described in claim 1, characterized in that: The rotor magnet is a surface-mounted magnet, and each pole of the surface-mounted magnet is divided into three segments; the middle magnetization direction is radial, which is the radial main magnet (5), and the magnetization directions on both sides are axial compensation magnets (7); when the magnetization direction of the radial main magnet (5) is radial outward, the magnetization directions of the two axial compensation magnets (7) on both sides are axial outward; when the magnetization direction of the radial main magnet (5) is radial inward, the magnetization directions of the two axial compensation magnets (7) on both sides are axial inward.

3. A permanent magnet arc-shaped motor with dual-sided axial compensation according to claim 1, characterized in that: The rotor magnet is a magnetizing structure. The magnetizing structure of the rotor magnet includes a radial main magnet (5) and a magnetizing block (11). The N and N poles of the radial main magnet (5) are circumferentially magnetized and arranged opposite each other. The magnetizing block (11) is set between the N and N poles of the radial main magnet (5). The radial main magnet (5) and the magnetizing block (11) are arranged alternately with a pair of poles in the order of radial main magnet (5) N pole → magnetizing block (11) → radial main magnet (5) S pole → magnetizing block (11).

4. A permanent magnet arc-shaped motor with dual-sided axial compensation according to claim 1, characterized in that: The number of arc-shaped stators is multiple, and the multiple arc-shaped stators are evenly distributed along the circumference of the rotor core (6).

5. A permanent magnet arc-shaped motor with dual-sided axial compensation according to claim 1, characterized in that: The number of arc-shaped stators is one.

6. A permanent magnet arc-shaped motor with dual-sided axial compensation according to claim 1, 4, or 5, characterized in that: The arc width of the arc-shaped stator is (n+1 / 2) times the pole pitch, where n is any positive integer.

7. A permanent magnet arc-shaped motor with dual-sided axial compensation according to claim 4, characterized in that: The distance between two adjacent arc-shaped stators is (n±1 / m) times the pole pitch, where n is any positive integer and m is the number of arc-shaped stators.

8. A permanent magnet arc-shaped motor with dual-sided axial compensation according to claim 1, characterized in that: The number of slots in the double-sided axial core (2) and the distribution of the double-sided axial compensation winding (4) are the same as the number of slots in the radial stator core (1) and the distribution of the radial main winding (3) in the main magnetic circuit.

9. A permanent magnet arc-shaped motor with dual-sided axial compensation according to claim 2, characterized in that: A magnetic isolation core (10) is provided between the radial main magnet (5) and the axial compensating magnet (7).

10. A permanent magnet arc-shaped motor with dual-sided axial compensation according to claim 1, characterized in that: Both ends of the arc-shaped stator are fixed with outer baffles (9).

Images