Inner-pole alternating deflection dual magnetic circuit independent hybrid excitation generator

Abstract

The present invention provides an independent hybrid excitation generator with double magnetic circuits and alternating deflection in poles, which belongs to the technical field of automobile motors and electrical appliances. The rotor core is evenly distributed with salient poles along the circumferential direction, and a first magnetic steel group is arranged in each salient pole, the first magnetic steel group includes a first rectangular permanent magnet, a second rectangular permanent magnet and a magnetic isolation groove, and the first magnetic steel group is alternately distributed with V-shaped magnetic steel and arc-shaped magnetic steel on the side away from the center of the rotor core circle, the V-shaped magnetic steel is an axisymmetric structure, the V-shaped magnetic steel is deflected toward the side close to the magnetic isolation groove, and the arc-shaped magnetic steel is located at the center of the salient pole where the arc-shaped magnetic steel is located. The outer magnetic steel group is arranged in an alternating offset manner, and there is no need to slot the outer circle of the rotor core. The process is simple, the mechanical strength is high, the production cost is low, the harmonic content is low, and the problem of large motor loss caused by the change of air gap magnetic resistance is solved, and the motor efficiency is improved.

Description

Technical Field

[0001] The invention provides an intra-pole alternating deflection dual-magnetic circuit independent hybrid excitation generator, belonging to the technical field of automobile motor and electrical appliances. Background Art

[0002] At present, the generator has the problems of low space utilization and high magnetic flux density distortion rate, which cannot better meet the user's use requirements. For example, the prior art, the published Chinese patent: claw pole permanent magnet and electromagnetic hybrid excitation generator rotor production method, application number: 201310644609.8, discloses a dual-rotor parallel hybrid excitation motor, which changes the size of the total air gap synthesis magnetic field by changing the size of the current in the claw pole rotor to adjust the output voltage. The published Chinese patent: a magnetic pole punching and a permanent magnet generator rotor core using the magnetic pole punching, discloses a rotor structure with staggered offset of the magnetic pole symmetry axes of adjacent core segments, which divides the permanent magnet generator rotor core in the axial direction to improve the harmonic magnetic field of the permanent magnet motor teeth. The method of opening grooves on the outer circle of the rotor increases the complexity of the process, and the mechanical strength is not high. The air gap causes the total magnetic resistance of the motor to increase, reducing the efficiency of the motor. The rotor axial segmentation is staggered, which increases the processing steps, which causes inconvenience in operation and reduces the work efficiency per unit time. Summary of the invention

[0003] The technical problem to be solved by the present invention is: under the premise of ensuring that the processing procedures, process difficulty and motor cost are not increased, the shortcomings of the prior art are overcome and a dual-magnetic circuit independent hybrid excitation generator with alternating deflection within the pole is provided. The motor structure is a double-layer permanent magnet salient pole hybrid excitation generator. The inner layer of the permanent magnet pole is an asymmetric structure. The magnetic isolation air gap is a part of the permanent magnet pole and is on one side of the permanent magnet steel, which can weaken the effect of the impact current and enhance the motor's anti-demagnetization ability. The outer layer of the permanent magnet pole is arranged with an staggered offset asymmetric structure to reduce the magnetic resistance, reduce the cogging torque, reduce the harmonic content of the air gap magnetic density, and improve the generator efficiency.

[0004] The technical solution adopted by the present invention to solve the technical problem is: an intra-pole alternating deflection dual magnetic circuit independent hybrid excitation generator, including a casing, a stator, a rotating shaft, a rotor core, a first magnetic steel group, a V-shaped magnetic steel, an arc-shaped magnetic steel and an excitation winding, characterized in that:

[0005] The rotor core is evenly distributed with 8 salient poles along the circumferential direction, and a first magnetic steel group is arranged in each of the salient poles, wherein the first magnetic steel group includes a first rectangular permanent magnet, a second rectangular permanent magnet and a magnetic isolation groove, and the first rectangular permanent magnet is distributed in a straight line along the circumferential direction of the rotor core, and the longitudinal symmetry axis of the first rectangular permanent magnet is located on the left side of the salient pole symmetry axis, and the salient pole symmetry axis passes through the first rectangular permanent magnet, and a magnetic isolation groove is arranged on the left side of the first rectangular permanent magnet, and the magnetic isolation groove and the proximal end of the first rectangular permanent magnet are connected, and the other end of the magnetic isolation groove extends toward the outer circle of the rotor core, and a second rectangular permanent magnet is arranged on the right side of the first rectangular permanent magnet, and one end of the second rectangular permanent magnet is close to the first rectangular permanent magnet and is not connected, and the other end of the second rectangular permanent magnet extends toward the outer circle of the rotor core;

[0006] A V-shaped magnetic steel with an axially symmetrical structure is provided at every other salient pole, the V-shaped magnetic steel is located on a side of the first magnetic steel group away from the center of the rotor core, the inner end of the V-shaped magnetic steel is located between the magnetic isolation groove and the symmetry axis of the salient pole where the V-shaped magnetic steel is located, the symmetry axis of the V-shaped magnetic steel and the symmetry axis of the salient pole where the V-shaped magnetic steel is located intersect at the center of the rotor core, and the proximal end of the V-shaped magnetic steel is not connected;

[0007] The arc length between the left end of the first magnetic steel group and the left end of the V-shaped magnetic steel is equal to the arc length of the V-shaped magnetic steel, and the arc length between the left end of the first magnetic steel group and the left end of the V-shaped magnetic steel is equal to half of the arc length between the right end of the first magnetic steel group and the right end of the V-shaped magnetic steel;

[0008] An arc-shaped magnet is provided in the salient pole without a V-shaped magnet. The arc-shaped magnet is located on the side of the first magnet group in the salient pole away from the center of the rotor. The symmetry axis of the arc-shaped magnet coincides with the symmetry axis of the salient pole where the arc-shaped magnet is located. The arc length corresponding to the arc-shaped magnet is equal to the arc length corresponding to the V-shaped magnet.

[0009] The included angle between the first rectangular permanent magnet and the magnetic isolation groove is an obtuse angle, and the included angle between the second rectangular permanent magnet and the first rectangular permanent magnet is an obtuse angle.

[0010] The angle between the symmetry axis of the V-shaped magnetic steel and the symmetry axis of the salient pole where the V-shaped magnetic steel is located α >0.

[0011] The non-connected distance between the inner end of the second rectangular permanent magnet and the right end of the first rectangular permanent magnet is 1.5 mm, and the non-connected distance between the outer end of the first magnetic steel group and the outer circle of the rotor is 1.5 mm.

[0012] The first rectangular permanent magnet, the second rectangular permanent magnet and the V-shaped magnet in the same salient pole have the same polarity toward the outer circle side of the rotor core, the first rectangular permanent magnet in adjacent salient poles have different polarity toward the outer circle side of the rotor core, and the first rectangular permanent magnet, the second rectangular permanent magnet and the arc-shaped magnet in the same salient pole have the same polarity toward the outer circle side of the rotor core.

[0013] An excitation winding is wound on each salient pole, and the corresponding arc length of the first magnetic steel group accounts for 2 / 3 of the arc length of the salient pole. The arc length between the left end of the first magnetic steel group and the left end of the salient pole is equal to the arc length between the right end of the first magnetic steel group and the right end of the salient pole, thereby reducing the eddy current loss and iron loss of the motor. The magnetic lines of force generated by the excitation winding pass through the rotor core part between the first magnetic steel group and the salient pole. The electromagnetic excitation magnetic field is connected in parallel with the permanent magnetic field. The dual magnetic circuits are independent of each other, the excitation loss is low, and the utilization rate of the permanent magnet is high.

[0014] Compared with the prior art, the present invention has the following technical effects:

[0015] (1) An asymmetric inner magnetic pole group structure is adopted, where the magnetic isolation slot is part of the permanent magnetic pole and is on one side of the permanent magnetic steel, which reduces the effect of the impact current and enhances the motor's anti-demagnetization ability;

[0016] (2) The magnetic pole group in a single salient pole is an asymmetric structure. The number of armature teeth corresponding to the left and right ends of the first magnetic steel group is different, and the permeance changes are different. The coupling effect weakens the cogging torque; the alternating offset in the magnetic pole changes the amplitude of the magnetic field harmonics and weakens the cogging torque. The present invention proposes a structure for doubly reducing the motor cogging torque, which improves the output voltage and stability of the generator;

[0017] (3) No slotting is required on the outer circle of the rotor core, and the rotor core punching process is simple, which reduces the production cost of the motor rotor. At the same time, it solves the problem of large motor losses caused by changes in air gap magnetic resistance and improves motor efficiency.

[0018] (4) The alternating offset of the outer layer of permanent magnet steel can reduce the cogging torque while largely retaining the mechanical strength of the motor rotor without any offset, avoiding the problem of low reliability caused by the entire magnetic pole offset. Compared with the rotor with full magnetic pole offset, it reduces the motor failure rate and increases the motor service life;

[0019] (5) The permanent magnet pole arc is 2 / 3 of the salient pole pole arc, which is conducive to improving the utilization rate of permanent magnets. The asymmetric setting of the magnetic steel group and the parallel connection of the salient pole double excitation magnetic field will also make the motor air gap magnetic flux density more sinusoidal, thereby improving the motor efficiency.

[0020] (6) The arc lengths of the left and right ends of the first magnetic steel group and the V-shaped magnetic steel are not equal, and the arc lengths of the left and right ends of the first magnetic steel group and the salient pole are not equal. Based on this unequal arc length, a single magnetic pole unequal arc length segmented structure is adopted to maximize the utilization of each permanent magnet steel, thereby improving the magnetic field strength and reducing the harmonic content of the air gap magnetic density. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a schematic structural diagram. In the figure: 1, a first rectangular permanent magnet, 2, a V-shaped magnetic steel, 3, a second rectangular permanent magnet, 4, a magnetic isolation groove, 5, an arc-shaped magnetic steel, 6, an excitation winding. Implementation

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] An intra-pole alternating deflection dual magnetic circuit independent hybrid excitation generator comprises a casing, a stator, a rotating shaft, a rotor core, a first magnetic steel group, a V-shaped magnetic steel 2, an arc-shaped magnetic steel 5 and an excitation winding 6, characterized in that:

[0024] The rotor core is evenly distributed with 8 salient poles along the circumferential direction, and a first magnetic steel group is arranged in each of the salient poles, wherein the first magnetic steel group includes a first rectangular permanent magnet 1, a second rectangular permanent magnet 3 and a magnetic isolation groove 4, and the first rectangular permanent magnet 1 is distributed in a straight line along the circumferential direction of the rotor core, and the longitudinal symmetry axis of the first rectangular permanent magnet 1 is located on the left side of the salient pole symmetry axis, and the salient pole symmetry axis passes through the first rectangular permanent magnet 1, and a magnetic isolation groove 4 is arranged on the left side of the first rectangular permanent magnet 1, and the magnetic isolation groove 4 is connected to the proximal end of the first rectangular permanent magnet 1, and the other end of the magnetic isolation groove 4 extends toward the outer circle of the rotor core, and a second rectangular permanent magnet 3 is arranged on the right side of the first rectangular permanent magnet 1, and one end of the second rectangular permanent magnet 3 is close to the first rectangular permanent magnet 1 and is not connected, and the other end of the second rectangular permanent magnet 3 extends toward the outer circle of the rotor core;

[0025] A V-shaped magnetic steel 2 with an axially symmetrical structure is provided at every other salient pole, the V-shaped magnetic steel 2 is located on the side of the first magnetic steel group away from the center of the rotor core, the inner end of the V-shaped magnetic steel 2 is located between the magnetic isolation groove 4 and the symmetry axis of the salient pole where the V-shaped magnetic steel 2 is located, the symmetry axis of the V-shaped magnetic steel 2 and the symmetry axis of the salient pole where the V-shaped magnetic steel 2 is located intersect at the center of the rotor core, and the proximal end of the V-shaped magnetic steel 2 is not connected;

[0026] The arc length between the left end of the first magnetic steel group and the left end of the V-shaped magnetic steel 2 is equal to the arc length corresponding to the V-shaped magnetic steel 2, and the arc length between the left end of the first magnetic steel group and the left end of the V-shaped magnetic steel 2 is equal to half of the arc length between the right end of the first magnetic steel group and the right end of the V-shaped magnetic steel 2;

[0027] An arc-shaped magnetic steel 5 is provided in the salient pole without the V-shaped magnetic steel 2. The arc-shaped magnetic steel 5 is located on the side of the first magnetic steel group in the salient pole away from the center of the rotor. The symmetry axis of the arc-shaped magnetic steel 5 coincides with the symmetry axis of the salient pole where the arc-shaped magnetic steel is located. The arc length corresponding to the arc-shaped magnetic steel 5 is equal to the arc length corresponding to the V-shaped magnetic steel 2.

[0028] The included angle between the first rectangular permanent magnet 1 and the magnetic isolation groove 4 is an obtuse angle, and the included angle between the second rectangular permanent magnet 3 and the first rectangular permanent magnet 1 is an obtuse angle.

[0029] The angle between the symmetry axis of the V-shaped magnetic steel 2 and the symmetry axis of the salient pole where the V-shaped magnetic steel 2 is located α >0.

[0030] The non-connected distance between the inner end of the second rectangular permanent magnet 3 and the right end of the first rectangular permanent magnet 1 is 1.5 mm, and the non-connected distance between the outer end of the first magnetic steel group and the outer circle of the rotor is 1.5 mm.

[0031] The first rectangular permanent magnet 1, the second rectangular permanent magnet 3 and the V-shaped magnet 2 in the same salient pole have the same polarity toward the outer circle side of the rotor core, the first rectangular permanent magnet 1 in adjacent salient poles have different polarity toward the outer circle side of the rotor core, and the first rectangular permanent magnet 1, the second rectangular permanent magnet 3 and the arc-shaped magnet 5 in the same salient pole have the same polarity toward the outer circle side of the rotor core.

[0032] An excitation winding 6 is wound on each salient pole, and the corresponding arc length of the first magnetic steel group accounts for 2 / 3 of the arc length of the salient pole. The arc length between the left end of the first magnetic steel group and the left end of the salient pole is equal to the arc length between the right end of the first magnetic steel group and the right end of the salient pole, thereby reducing the eddy current loss and iron loss of the motor. The magnetic lines of force generated by the excitation winding 6 pass through the rotor core part between the first magnetic steel group and the salient pole, the electromagnetic excitation magnetic field is connected in parallel with the permanent magnetic field, the dual magnetic circuits are independent of each other, the excitation loss is low, and the utilization rate of the permanent magnet is high.

Claims

1. An intra-pole alternating deflection dual magnetic circuit independent hybrid excitation generator, comprising a housing, a stator, a rotating shaft, a rotor core, a first magnetic steel group, a V-shaped magnetic steel (2), an arc-shaped magnetic steel (5) and an excitation winding (6), characterized in that: The rotor core is evenly distributed with eight salient poles along the circumferential direction, and each of the salient poles is provided with a first magnetic steel group, the first magnetic steel group comprising a first rectangular permanent magnet (1), a second rectangular permanent magnet (3) and a magnetic isolation groove (4), the first rectangular permanent magnet (1) being distributed in a straight line along the circumferential direction of the rotor core, the longitudinal symmetry axis of each first rectangular permanent magnet (1) being located on the left side of the symmetry axis of the salient pole where it is located, and the symmetry axis of each salient pole passes through the first rectangular permanent magnet (1) in the corresponding salient pole, a magnetic isolation groove (4) being provided on the left side of the first rectangular permanent magnet (1), the magnetic isolation groove (4) being connected to the adjacent ends of the first rectangular permanent magnet (1), and the other end of the magnetic isolation groove (4) extending toward the outer circle of the rotor core, a second rectangular permanent magnet (3) being provided on the right side of the first rectangular permanent magnet (1), one end of the second rectangular permanent magnet (3) being close to the first rectangular permanent magnet (1) and not connected, and the other end of the second rectangular permanent magnet (3) extending toward the outer circle of the rotor core; A V-shaped magnetic steel (2) with an axially symmetrical structure is provided at every other salient pole, the V-shaped magnetic steel (2) is located on a side of the first magnetic steel group away from the center of the rotor core, the inner end of the V-shaped magnetic steel (2) is located between the magnetic isolation groove (4) and the symmetry axis of the salient pole where the V-shaped magnetic steel (2) is located, the symmetry axis of the V-shaped magnetic steel (2) and the symmetry axis of the salient pole where the V-shaped magnetic steel (2) is located intersect at the center of the rotor core, and the proximal end of the V-shaped magnetic steel (2) is not connected; The arc length between the left end of the first magnetic steel group and the left end of the V-shaped magnetic steel (2) is equal to the arc length corresponding to the V-shaped magnetic steel (2), and the arc length between the left end of the first magnetic steel group and the left end of the V-shaped magnetic steel (2) is equal to half the arc length between the right end of the first magnetic steel group and the right end of the V-shaped magnetic steel (2); An arc-shaped magnetic steel (5) is arranged in a salient pole without a V-shaped magnetic steel (2), the arc-shaped magnetic steel (5) is located on a side of the first magnetic steel group in the salient pole away from the center of the rotor, the symmetry axis of the arc-shaped magnetic steel (5) coincides with the symmetry axis of the salient pole where the arc-shaped magnetic steel is located, and the arc length corresponding to the arc-shaped magnetic steel (5) is equal to the arc length corresponding to the V-shaped magnetic steel (2).

2. The intra-pole alternating deflection dual magnetic circuit independent hybrid excitation generator according to claim 1, characterized in that: The angle between the first rectangular permanent magnet (1) and the magnetic isolation groove (4) is an obtuse angle, and the angle between the second rectangular permanent magnet (3) and the first rectangular permanent magnet (1) is an obtuse angle.

3. The intra-pole alternating deflection dual magnetic circuit independent hybrid excitation generator according to claim 1, characterized in that: The angle α between the symmetry axis of the V-shaped magnetic steel (2) and the symmetry axis of the salient pole where the V-shaped magnetic steel (2) is located is greater than 0.

4. The intra-pole alternating deflection dual magnetic circuit independent hybrid excitation generator according to claim 1, characterized in that: The non-connected distance between the inner end of the second rectangular permanent magnet (3) and the right end of the first rectangular permanent magnet (1) is 1.5 mm, and the non-connected distance between the outer end of the first magnetic steel group and the outer circle of the rotor is 1.5 mm.

5. The intra-pole alternating deflection dual magnetic circuit independent hybrid excitation generator according to claim 1, characterized in that: The first rectangular permanent magnet (1), the second rectangular permanent magnet (3) and the V-shaped magnetic steel (2) in the same salient pole have the same polarity toward the outer circle side of the rotor core, the first rectangular permanent magnet (1) in adjacent salient poles have different polarity toward the outer circle side of the rotor core, and the first rectangular permanent magnet (1), the second rectangular permanent magnet (3) and the arc-shaped magnetic steel (5) in the same salient pole have the same polarity toward the outer circle side of the rotor core.

6. The intra-pole alternating deflection dual magnetic circuit independent hybrid excitation generator according to claim 1, characterized in that: An excitation winding (6) is wound on each salient pole, the arc length corresponding to the first magnetic steel group accounts for 2 / 3 of the arc length of the salient pole, the arc length between the left end of the first magnetic steel group and the left end of the salient pole is equal to the arc length between the right end of the first magnetic steel group and the right end of the salient pole, thereby reducing the eddy current loss and iron loss of the motor, the magnetic lines of force generated by the excitation winding (6) pass through the rotor core part between the first magnetic steel group and the salient pole, the electric excitation magnetic field is connected in parallel with the permanent magnetic field, the double magnetic circuits are independent of each other, the excitation loss is low, and the utilization rate of the permanent magnet is high.

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