Motor or generator with stator sine winding
By setting N-phase windings of different turns in the stator sinusoidal winding of a multi-phase motor or generator, the magnetomotive force coefficient of the air gap circle is sinusoidal, the problem that stator harmonics can only be weakened in a specific order in the prior art, achieving lower noise and loss.
Patent Information
- Application Number
- CN202411843568.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-14
- Publication Date
- 2025-03-07
AI Technical Summary
The stator sinusoidal winding distribution of existing multiphase motors or generators lacks specific and easy-to-calculate theoretical guidance, resulting in the stator harmonics being only weakened at a specific order, increasing the noise and loss of the motor.
A motor or generator with a stator sinusoidal winding is proposed. By setting N-phase windings of different turns at different positions in the circumference of the air gap, the magnetomotive force coefficient of the air gap circle is sinusoidal. The specific implementation method is to distribute each phase winding in three adjacent grooves, the electrical angle span of each two grooves is 30 degrees, and a single and double-layer hybrid winding is used, with a total number of slots 6 times the number of poles, and the 3-phase winding has an electrical angle of 120°.
Through this design, the sine distribution of magnetic tight along the air gap circle is achieved, reducing noise and loss and improving the performance of the motor.
Smart Images
Figure FT_1
Abstract
Description
Technical Field
[0001] Motor or generator field. Background Art
[0002] At present, there is a lack of certain specific and easy-to-calculate theoretical guidance on the distribution of stator sinusoidal windings of multi-phase motors or generators in theory and application, resulting in that stator harmonics can only be weakened at specific orders, which increases the noise and loss of the motor. Therefore, the present invention particularly proposes a theory with a specific operating method and easy to calculate, and provides a typical three-phase motor or generator sinusoidal winding example. Summary of the invention
[0003] A motor or generator with a stator sinusoidal winding comprises a stator and a rotor, wherein the stator has N-phase windings, the number of turns of each phase winding at different positions of the air gap circumference is inconsistent, and after the N-phase windings are energized with currents at different electrical angles, the magnetomotive force coefficient of the air gap circular surface is sinusoidally distributed at any time (without considering the effect of the rotor magnetic field). At this time, we only need to consider the magnetomotive force coefficient in the state of 2-phase double-layer mixing, and the magnetomotive force coefficient is 0.5*sin(θ)-0.5*sin(θ+360° / N))= -sin(360° / 2 / N)*cos(θ+360° / 2 / N)= -sin(360° / 2 / N)*sin(90-θ-360° / 2 / N)= sin(360° / 2 / N)*sin(θ+360° / 2 / N-90°); when N=3, its coefficient is sin(60°)*sin(θ-30°). If we define 30° as the electrical angle of the hybrid double-layer position, this means that at the hybrid phase double-layer position, the number of turns is the number of turns of a single-layer full-span slot of a certain phase divided by sin(60°). At this position, the magnetic flux density will also be sinusoidally distributed along the air gap circle.
[0004] The motor or generator according to claim 1 is characterized in that: a motor with a stator of three-phase sinusoidal windings comprises a stator and a rotor, and its main characteristics are: each pole and each phase of winding A phase, winding B phase, and winding C phase on the stator are distributed in three adjacent slots, and the electrical angle span of every two slots is 30 degrees; the wiring is a single-layer and double-layer mixed winding, the total number of slots is 6 times the number of poles, and the three-phase winding presents an electrical angle of 120°; the number of turns of the middle full pole across the slot of each pole and each phase is sin (60°) times the number of turns of the short and long slots, and the average span of each phase is the pole pitch; like Figure 1As shown, the motor is an 8-pole 48-slot motor, wherein windings (2), (3), (4), and (6) are A-phase incoming wires, windings (13), (15), (16), and (17) are A-phase outgoing wires, windings (5), (7), (8), and (9) are B-phase incoming wires, windings (18), (19), (20), and (22) are B-phase outgoing wires, windings (10), (11), (12), and (14) are C-phase incoming wires, windings (21), (23), (24), and (15) are C-phase outgoing wires. For the C-phase outgoing line, the number of turns of windings (3), (4), (15), (16), (7), (8), (19), (20), (11), (12), (23), (24) is sin(60°) times the number of turns of windings (2), (6), (13), (17), (5), (9), (18), (22), (10), (14), (21), (1). The magnetomotive force coefficient at the mixed-phase double-layer winding is: 0.5*sin(θ)-0.5* sin(θ+120°) = 0.5*sin(θ) + 0.5* sin(θ-60°) = sin(60°)*sin(θ-30°). If we define 30° as the electrical angle of the hybrid double-layer position, this means that at the hybrid phase double-layer position, the number of turns is the number of turns of the single-layer full-span slot divided by sin(60°). At this position, the magnetic flux density will also be sinusoidally distributed along the air gap circle.
[0005] The motor or generator according to claim 1 is characterized in that it can be a radial flux motor, an axial flux motor, a hybrid flux motor, or a linear motor.
[0006] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may 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 the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein. BRIEF DESCRIPTION OF THE DRAWINGS
[0007] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0008] Figure 1 It is a cross-sectional schematic diagram of an 8-pole motor with a winding 1 / 4 stator according to the present invention.
Claims
1. A motor or generator with a stator sinusoidal winding, comprising a stator and a rotor, wherein the stator has N-phase windings, each phase winding has different turns at different positions on the air gap circumference, and after the N-phase windings are energized with currents at different electrical angles, the magnetomotive force coefficient of the air gap circular surface is sinusoidally distributed at any time (without considering the rotor magnetic field). At this time, we only need to consider the magnetomotive force coefficient in the state of 2-phase double-layer mixing, and the magnetomotive force coefficient is 0.5*sin(θ)-0.5* sin(θ+360° / N))= -sin(360° / 2 / N)*cos(θ+360° / 2 / N)= -sin(360° / 2 / N)*sin(90-θ-360° / 2 / N)=sin(360° / 2 / N)*sin(θ+360° / 2 / N-90°); when N=3, its coefficient is sin(60°)*sin(θ-30°). If we define 30° as the electrical angle of the hybrid double-layer position, this means that at the hybrid phase double-layer position, the number of turns is the number of turns of a single-layer full-span slot of a certain phase divided by sin(60°). At this position, the magnetic flux density will also be sinusoidally distributed along the air gap circle.
2. The motor or generator according to claim 1, characterized in that: A motor with a stator having a three-phase sinusoidal winding comprises a stator and a rotor, and its main features are: Each pole and each phase of winding A phase, winding B phase, and winding C phase on the stator are distributed in three adjacent slots, and the electrical angle span between every two slots is 30 degrees; the wiring is a single-layer and double-layer mixed winding, the total number of slots is 6 times the number of poles, and the three-phase winding presents an electrical angle of 120°; the number of turns across the slots of each pole and each phase is sin (60°) times the number of turns across the short and long slots, and the average span of each phase is the pole pitch.
3. The motor or generator according to claim 1, characterized in that: It can be a radial flux motor, an axial flux motor, a hybrid flux motor, or a linear motor.