Centrifugal magnetic adjusting device of high-speed motor

Abstract

The invention discloses a high-speed motor centrifugal magnetic adjusting device, which comprises a composite rotating shaft, a magnetic adjusting rotor, a rigid rotor and a magnetic adjusting device, and is characterized in that the composite rotating shaft is divided into a tooth-shaped section with circumferential transmission teeth and an optical axis section with a smooth surface, the magnetic adjusting rotor is sleeved on the tooth-shaped section and can slide along the axial direction, and the rigid rotor is fixed on the optical axis section; the magnetic adjusting devices are arranged on the end face between the magnetic adjusting rotor and the rigid rotor and evenly distributed in the circumferential direction, each magnetic adjusting device comprises a triangular groove piece, a boss piece and a tension ball, and the triangular groove pieces are fixed to the end face of the rigid rotor and provided with guide slopes to form slope sliding rails. The upper end of the boss piece is embedded into a radial groove in the bottom of the flux adjusting rotor, the lower end of the boss piece is in slope sliding fit with the guide slope, and the tension ball is arranged in a spherical cavity in the radial outer end of the boss piece and limited. Centrifugal force is generated through rotation of the tension ball, the centrifugal force is converted into axial component force through the slope sliding rail to push the magnetic field adjusting rotor to move axially, so that the magnetic field coupling strength of the motor is adjusted, and the device is suitable for a wide-speed-range high-speed motor system.

Description

A centrifugal magnet adjustment device for high-speed motors Technical Field

[0001] This invention relates to the field of high-speed motor technology, and more specifically to a centrifugal magnetic adjustment device that uses centrifugal force to drive a mechanical structure to achieve axial displacement in order to adjust magnetic field coupling. Background Technology

[0002] High-speed motors operating over a wide speed range require dynamic adjustment of the excitation magnetic field to balance low-speed high torque and high-speed constant power characteristics. Existing magnetic field adjustment technologies mainly fall into three categories: electromagnetic, hydraulic, and mechanical. Electromagnetic magnetic field adjustment is currently the most widely used technology, including variable reluctance magnetic field adjustment, hybrid excitation magnetic field adjustment, and memory motor magnetic field adjustment schemes. Variable reluctance magnetic field adjustment adjusts the magnetic field by changing the magnetic reluctance of the magnetic circuit, but requires additional excitation windings and power converters, increasing system size and copper losses. Hybrid excitation motors add an electrically excited excitation winding to the permanent magnet motor, achieving magnetic field adjustment by regulating the excitation current. However, the excitation winding is subjected to enormous centrifugal force at high speeds, resulting in poor insulation reliability, and the additional air gap reduces the utilization rate of the permanent magnet. Memory motors utilize the magnetic memory characteristics of low-coercivity permanent magnets, changing the magnetization state through instantaneous current pulses. However, the magnetic field adjustment process has high energy consumption and a long adjustment cycle, making it difficult to meet the requirements of high-speed dynamic response. Furthermore, electromagnetic solutions suffer from complex control systems, severe electromagnetic interference, and low reliability under high-temperature and high-speed environments.

[0003] Hydraulic magnetic adjustment technology uses a hydraulic cylinder to drive the magnetic adjustment component axially, providing a large and continuously adjustable output force. However, it requires a hydraulic pump station, control valve group, sealing system, and oil pipeline network, resulting in a complex structure and difficult maintenance. Hydraulic oil is susceptible to high-temperature carbonization and low-temperature solidification, limiting its operating temperature range. Furthermore, the wear and leakage risks of seals under high-speed rotation further reduce system reliability.

[0004] Mechanical magnetic adjustment technology has the advantages of simple structure and direct response, but existing technologies all have bottlenecks in engineering applications: While centrifugal counterweight schemes are highly reliable, the square relationship between the adjusting force and the rotational speed results in a fixed nonlinear magnetic field adjustment, making flexible adjustment impossible; the spring-mass block scheme, although customizable nonlinear characteristics can be achieved through spring stiffness design, suffers from insufficient fatigue life under long-term high-speed alternating loads; and while cam mechanism schemes can precisely program the displacement-rotation relationship, the cam pair experiences severe wear at high speeds, resulting in poor accuracy retention. Therefore, existing mechanical magnetic adjustment technologies cannot simultaneously achieve the flexibility of nonlinear adjustment and the reliability of high-speed, long-life operation.

[0005] As high-speed motors develop towards higher speeds, wider speed ranges, and higher power densities, existing magnetic field adjustment technologies are no longer sufficient to meet core requirements such as rapid response, purely mechanical passive drive, high reliability, and adaptive adjustment. Therefore, there is an urgent need for an innovative purely mechanical magnetic field adjustment device capable of achieving precise, reliable, and adaptive magnetic field adjustment in high-speed rotation environments. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a centrifugal magnetic adjustment device for a high-speed motor, which efficiently converts the rotational centrifugal force into axial magnetic adjustment force through a centrifugal-inclined plane conversion mechanism, thereby realizing passive adaptive magnetic field adjustment of the motor in a wide speed range.

[0007] The technical solution adopted by this invention to solve the technical problem is as follows: A centrifugal magnetic adjustment device for a high-speed motor includes a composite shaft, a magnetic adjustment rotor, a rigid rotor, and a magnetic adjustment device; the composite shaft is divided into a toothed section with circumferential transmission teeth and a smooth optical shaft section; the magnetic adjustment rotor is made of magnetically conductive material, sleeved on the toothed section, and meshes with the transmission teeth to form a transmission, and can slide axially along the composite shaft; the rigid rotor is fixedly installed on the optical shaft section; the magnetic adjustment device is disposed at the end face between the magnetic adjustment rotor and the rigid rotor, evenly distributed circumferentially, and multiple sets are arranged, each set of magnetic adjustment devices including a triangular groove and a boss. The device comprises a triangular groove fixed to the end face of a rigid rotor and having a guide slope to form an inclined slide rail; the upper end of the boss is embedded in a radial groove at the bottom of the magnetic adjustment rotor, the radial width of which is greater than the radial thickness of the upper end of the boss to form a movable gap, and the lower end of the boss forms an inclined sliding fit with the guide slope; the tension ball is disposed in a spherical cavity at the radial outer end of the boss and is limited thereto; wherein: the tension ball generates centrifugal force as the motor rotates, driving the boss to slide obliquely along the guide slope, converting the centrifugal force into an axial component force to push the magnetic adjustment rotor to axial displacement, thereby adjusting the motor magnetic field.

[0008] Preferably, the inner hole of the magnetic rotor is provided with internal teeth that mesh with the toothed section, and the rigid rotor and the optical axis section are circumferentially fixed by interference fit or key connection.

[0009] Preferably, the bottom of the magnetic rotor is provided with a plurality of radial grooves evenly distributed along the circumference, and a radial movable gap is provided between each radial groove and the upper end of the corresponding boss.

[0010] Preferably, the boss has a three-section stepped structure, with a rectangular insert head at the upper end, a sliding part matching the guide slope at the lower end, and a spherical cavity formed on the radial outer end face of the middle section.

[0011] Preferably, the tension ball is a spherical body that can only roll radially slightly relative to the boss by means of a cavity opening or a retaining ring.

[0012] Preferably, the guide ramp forms an acute angle with the axial direction.

[0013] Preferably, the triangular groove is fastened to the end face of the rigid rotor by bolts or integrally formed, and its guide slope surface is provided with a solid lubricating coating.

[0014] Preferably, the magnetic adjustment devices are evenly distributed along the circumference and multiple sets are provided.

[0015] Preferably, the static friction between the triangular groove and the boss is configured such that the centrifugal force drives the boss to slide only when the motor exceeds a preset threshold speed.

[0016] Preferably, when the magnetic rotor is axially displaced, its axial relative position with the stator magnetic field changes, thereby adjusting the magnetic field coupling strength.

[0017] This invention is based on the centrifugal-inclined-plane mechanical conversion principle. It directly converts the motor speed signal into the axial displacement of the magnetic rotor through a purely mechanical structure, achieving passive adaptive magnetic field adjustment. Its core innovation lies in using centrifugal force as the driving force source. The direction of the force is converted through the inclined slide rail composed of triangular groove and boss components, ultimately driving the magnetic rotor to move axially to change its coupling strength with the main magnetic field.

[0018] The mechanical conversion mechanism of this invention is as follows: 1. Centrifugal force generation: The tension ball, as a mass (object), generates radial centrifugal force when it rotates with the motor. The formula for centrifugal force is:

[0019] Where: is the centrifugal force acting on the object, is the mass of the object, is the linear velocity of the object, and is the radius of the object.

[0020] 2. Inclined Surface Decomposition: The lower end of the boss and the guide inclined surface of the triangular groove form a sliding pair. Centrifugal force is transmitted to the boss through the spherical cavity and decomposed into an axial component (along the axial direction, directly driving the axial displacement of the magnetic rotor) and a normal component (perpendicular to the inclined surface, maintaining the contact pressure between the boss and the triangular groove).

[0021] 3. Magnetic field adjustment: The axial displacement of the magnetic rotor changes its effective coupling area with the stator main magnetic field, thereby linearly or nonlinearly adjusting the main magnetic flux density to achieve magnetic weakening for speed increase or magnetic enhancement for torque increase.

[0022] The working process of this invention is based on the centrifugal-inclined plane mechanical conversion principle, and is divided into two working conditions: low speed silent and high speed magnetic adjustment. Automatic switching is achieved through the preset static friction threshold, without the need for external control: I. Low speed operation (functional silent state) When the motor speed is lower than the preset threshold: (1) Insufficient centrifugal force: The centrifugal force generated by the tension ball rotating with the rotor is small, and its radial force is less than the static friction between the boss and the triangular groove, so it cannot push the boss to slide; (2) Mechanism locking: The boss remains stationary at the bottom of the guide incline, the axial distance between the magnetic adjustment rotor and the rigid rotor is constant, and the magnetic adjustment rotor maintains the maximum coupling area with the main magnetic field; (3) Magnetic field characteristics: The main magnetic flux density is the largest, and the motor outputs peak torque to meet the low speed and high load start-up requirements; At this time, the magnetic adjustment device does not consume energy and is in the functional silent state.

[0023] II. High-speed operation (adaptive magnetic adjustment state) When the motor speed exceeds the preset threshold: (1) Centrifugal force drive: The centrifugal force generated by the tension ball increases significantly, overcoming static friction and driving the boss to slide upward along the guide slope; (2) Slope conversion: When the boss moves along the guide slope, the centrifugal force is decomposed into axial force and normal force; the axial force directly acts on the side wall of the groove at the bottom of the magnetic adjustment rotor, pushing the magnetic adjustment rotor to axial displacement; (3) Magnetic field adjustment: The axial displacement of the magnetic adjustment rotor changes its effective coupling area with the main magnetic field, so that the main magnetic flux density is reduced accordingly, realizing high-speed weak magnetic control, and the motor enters the constant power operation area; the displacement increases automatically with the square of the speed, and is completely adaptive.

[0024] This invention breaks through the limitations of existing electromagnetic, hydraulic and mechanical magnetic adjustment technologies, and realizes a purely mechanical, passive, adaptive, bidirectional reversible and highly reliable magnetic field adjustment, providing an ideal magnetic adjustment solution for the efficient operation of high-speed motors over a wide speed range. It has significant technological progress and broad market application prospects.

[0025] The positive and beneficial effects of this invention are as follows: 1. Purely mechanical passive adaptive adjustment with extremely rapid response: This invention completely eliminates the excitation winding, power converter, and complex control algorithm required by traditional electromagnetic magnetic adjustment, and also eliminates the need for pump stations, valve groups, and sealing systems required by hydraulic magnetic adjustment. This invention directly utilizes the centrifugal force generated by the rotation of the motor as the driving force source, and converts the centrifugal force into axial thrust through the inclined slide rail mechanism to drive the magnetic adjustment rotor displacement; this purely mechanical transmission method eliminates the signal delay of the electrical control link and the pipeline lag of the hydraulic system, realizing the instantaneous conversion from speed signal to magnetic adjustment action. Actual measurements show that the response time from speed change to the start of magnetic adjustment rotor displacement is much shorter than that of the electromagnetic scheme, which can instantaneously match load changes, and is particularly suitable for situations with demanding dynamic performance requirements such as rapid acceleration and deceleration of electric vehicles and sudden load changes in aero engines.

[0026] 2. Simple structure, extremely high reliability, and extremely long service life: The entire magnetic adjustment device of this invention consists of only three core parts: a triangular groove part, a boss part, and a tension ball. In addition to the rotating shaft, magnetic adjustment rotor, and rigid rotor, there are a total of six main components. With fewer parts and no easily damaged electrical components or hydraulic seals, the failure rate is fundamentally reduced. The key friction pairs are treated with mature lubrication technology, and the multiple evenly distributed design enables automatic force balance, avoiding stress concentration and uneven wear. This extremely simple mechanical structure theoretically has no fatigue life limit components, and the actual service life can be several times or even tens of times longer than that of traditional electromagnetic magnetic adjustment devices, meeting the extreme reliability requirements of fields such as aviation and aerospace.

[0027] 3. Wide-speed-range adaptive adjustment, perfectly matching motor load characteristics: Centrifugal force is proportional to the square of the rotational speed. This natural physical law gives this invention adaptive adjustment characteristics: the higher the motor speed, the greater the centrifugal force and the greater the axial thrust. The displacement of the magnetic rotor automatically increases, and the weakening of the magnetic field automatically deepens. This square law relationship between rotational speed and magnetic adjustment perfectly matches the magnetic field-speed curve required for constant power operation of high-speed motors. It can achieve automatic adaptation from low speed to high speed under all operating conditions without any external control intervention, fully meeting the wide-speed-range requirements of applications such as electric vehicle drive motors and high-speed electric spindles.

[0028] 4. Smooth operation and excellent vibration resistance: The magnetic adjustment device of this invention is evenly arranged in multiple groups (at least 3 groups) along the circumference. Each group works simultaneously and is subjected to completely symmetrical forces. This uniform distribution design causes the centrifugal forces to cancel each other out radially, retaining only pure axial thrust, fundamentally avoiding axial wear, radial vibration, and mechanical noise caused by unilateral force. Compared with single-point or dual-point drive structures, the multiple evenly distributed groups ensure balanced force on the magnetic adjustment rotor, significantly improving operational stability. Vibration speed can be controlled at an extremely low level, making it particularly suitable for fields with stringent vibration requirements, such as precision machining electric spindles and high-speed aerospace generators.

[0029] 5. Strong environmental adaptability, no electromagnetic interference and oil pollution: The pure mechanical structure does not require electricity and can work stably in harsh conditions such as extreme temperature environments (from extreme cold to high temperature) and high humidity and high salt spray; there are no electromagnetic coils, so there is no electromagnetic interference and no impact on surrounding precision electronic equipment, communication systems and sensors; there is no hydraulic oil, which completely eliminates the risk of leakage and pollution, and meets the strict requirements of clean environments (such as medical equipment, food processing and semiconductor manufacturing).

[0030] 6. Low cost, easy maintenance, and increased power density: All parts of this invention are conventionally machined parts, eliminating the need for precision coil winding, power modules, or hydraulic components, significantly reducing manufacturing costs compared to electromagnetic magnetic adjustment devices; the device is integrated into the rotor end face, without increasing the overall axial length of the motor, making the motor structure more compact and increasing power density; daily maintenance only requires periodic checks of lubrication status and wear of parts, eliminating the need for electrical adjustments or hydraulic oil replacement, resulting in extremely low maintenance costs and a significantly extended maintenance cycle.

[0031] 7. Flexible application of magnetic adjustment characteristics: By changing the inclination angle of the guide ramp, the mass of the tension ball, or the radius of rotation, the starting threshold and magnetic adjustment rate of the magnetic adjustment device can be flexibly configured to adapt to the personalized needs of different motors (aircraft generators, electric vehicle drive motors, high-speed electric spindles, etc.); the inclination angle of the ramp is adjustable in the range of 15° to 45°, and magnetic adjustment characteristics can be programmed from approximately linear to highly nonlinear; this flexibility allows the same device architecture to be quickly derived into multiple specifications to meet the customized needs of different application scenarios and significantly shorten the product development cycle. Attached Figure Description

[0032] Figure 1 is a schematic diagram of the overall structure of the present invention (showing the assembly relationship of the composite shaft, the magnetic adjustment rotor, the rigid rotor, and the magnetic adjustment device); Figure 2 is a partial enlarged view of the magnetic adjustment device in Figure 1; Figure 3 is an enlarged view of one set of magnetic adjustment devices in Figure 2 (showing the relative positions of the triangular groove, the boss, and the tension ball); Figure 4 is a schematic diagram of the composite shaft (showing the segmented structure of the toothed section and the optical shaft section); Figure 5 is a schematic diagram of the magnetic adjustment rotor (showing the internal teeth and the bottom radial groove); Figure 6 is a partial enlarged view of the groove in Figure 5 (showing the fitting clearance between the groove and the upper end of the boss); Figure 7 is a schematic diagram of the rigid rotor; Figure 8 is a partial enlarged view of the triangular groove in Figure 7 (showing the guide slope); Figure 9 is a schematic diagram of the movement direction of the boss under centrifugal force (showing the oblique sliding trajectory); Figure 10 is a schematic diagram of the axial displacement direction of the magnetic adjustment rotor; In the figures, 1--composite shaft, 2--magnetic adjustment rotor, 3--rigid rotor, 4--boss, 5--tension ball, 6--triangular groove. Detailed Implementation

[0033] The present invention will be further explained and described below with reference to the accompanying drawings and specific embodiments: Embodiment As shown in Figures 1 to 3, the high-speed motor centrifugal magnetic adjustment device of this embodiment mainly includes a composite shaft 1, a magnetic adjustment rotor 2, a rigid rotor 3, and a magnetic adjustment device disposed between the magnetic adjustment rotor 2 and the rigid rotor 3. The magnetic adjustment device is evenly distributed along the circumference and multiple sets are arranged. The composite shaft 1 includes a toothed section and a smooth shaft section. The toothed section has circumferentially distributed transmission teeth on its surface for meshing and transmission with the magnetic adjustment rotor 2, while allowing the magnetic adjustment rotor 2 to slide along the axial direction. The smooth shaft section is a smooth cylindrical surface ground with high precision.

[0034] The magnetic adjustment rotor 2 is a ring-shaped structure made of magnetic material. Its inner hole is machined with internal teeth that mate with the toothed section of the composite shaft 1. This fit is a clearance fit, which ensures torque transmission while achieving axial movement freedom. The end face of the magnetic adjustment rotor 2 is uniformly provided with multiple radial grooves along the circumference near the outer edge. Each groove has a rectangular cross-section. The radial width of the groove is greater than the thickness of the upper end of the boss 4, forming a one-sided radial movement gap. This gap allows the upper end of the boss 4 to move freely radially within the groove without jamming.

[0035] The rigid rotor 3 is a cylindrical structure and is mechanically fixed to the optical axis section of the composite shaft 1, maintaining a rigid connection with the shaft without relative movement. Multiple triangular groove pieces 6 are uniformly fixed on the end face of the rigid rotor 3 along the circumference. Each triangular groove piece 6 has an inclined guide groove on its end face. The two inclined surfaces of the guide groove form a guide inclined surface. The guide inclined surface forms an acute angle with the axis of the composite shaft 1. The surface of the guide inclined surface is coated with a molybdenum disulfide solid lubricant coating to reduce the coefficient of friction.

[0036] Each magnetic adjustment device includes a triangular groove 6, a boss 4, and a tension ball 5. The boss 4 has a three-section stepped structure: the upper end is a rectangular insert head, which is assembled in the radial groove of the magnetic adjustment rotor 2; the lower end is a wedge-shaped sliding part, whose wedge-shaped inclined surface forms a precise sliding fit with the guide inclined surface of the triangular groove 6; the middle section has a spherical cavity on the radial outer end face to accommodate the tension ball 5; the tension ball 5 is a spherical body made of high-density alloy. After being inserted into the spherical cavity, it is limited by mechanical closing or elastic retaining ring, so that the tension ball 5 cannot leave the spherical cavity but can make radial micro-rolling in the cavity, with the rolling gap controlled within the range of 0.1 to 0.2 mm.

[0037] The working process of the high-speed motor centrifugal magnetic adjustment device in this embodiment is as follows: When the motor speed is lower than the preset threshold, the centrifugal force generated by the tension ball 5 rotating with the rotor is small. After the centrifugal force is transmitted to the boss 4 through the spherical cavity, it cannot overcome the static friction between the lower end of the boss 4 and the guide slope of the triangular groove 6. At this time, the boss 4 remains stationary at the initial position at the bottom of the guide slope, the axial distance between the magnetic adjustment rotor 2 and the rigid rotor 3 is constant, the magnetic adjustment rotor 2 and the main magnetic field of the motor maintain the maximum coupling area, the main magnetic flux density is the maximum, and the motor outputs the peak torque. The entire magnetic adjustment device does not consume additional energy under this condition and is in a functional silent state.

[0038] During high-speed operation (adaptive magnetic field adjustment state): When the motor speed exceeds the preset threshold, the centrifugal force on the tension ball 5 increases significantly. This centrifugal force overcomes the static friction and drives the boss 4 to slide obliquely upward along the guide slope. The centrifugal force is decomposed into axial and normal components on the guide slope. The axial component acts directly on the sidewall of the radial groove at the bottom of the magnetic field adjustment rotor 2, pushing the magnetic field adjustment rotor 2 to generate axial displacement. The displacement automatically increases with the increase of speed, and the effective coupling area between the magnetic field adjustment rotor 2 and the main magnetic field of the motor decreases accordingly. The main magnetic flux density decreases, realizing high-speed field weakening control, and the motor enters the constant power operation zone. This process is completely adaptive and requires no external control signals.

[0039] The standard embodiment of this invention consists of multiple sets of magnetic adjustment devices evenly distributed circumferentially. To clearly illustrate the structural details, Figure 5 only schematically shows one set of magnetic adjustment devices, solely for the purpose of highlighting this device. In reality, the magnetic adjustment rotor 2 has multiple evenly distributed grooves, the same number as the sets of magnetic adjustment devices. Those skilled in the art should understand that the number of sets of magnetic adjustment devices can be selected from multiple ranges depending on the motor power and magnetic force requirements, all of which fall within the scope of protection of this invention.

[0040] This embodiment utilizes the synergistic effect of centrifugal-inclined plane mechanical conversion through multiple sets of magnetic adjustment devices to directly convert speed signals into axial displacement. It features rapid response, a purely mechanical structure with no electromagnetic interference, balanced force, and smooth operation, making it particularly suitable for wide-speed-range high-speed motor systems.

Claims

1. A centrifugal magnetizing device for a high-speed motor, characterized in that: The system includes a composite shaft, a magnetically adjustable rotor, a rigid rotor, and a magnetic adjustment device. The composite shaft is divided into a toothed section with circumferential transmission teeth and a smooth, flat shaft section. The magnetically adjustable rotor, made of magnetically conductive material, is fitted onto the toothed section and meshes with the transmission teeth, allowing axial sliding along the composite shaft. The rigid rotor is fixedly mounted on the flat shaft section. The magnetic adjustment device is located at the end face between the magnetically adjustable rotor and the rigid rotor, evenly distributed circumferentially in multiple sets. Each set of magnetic adjustment devices includes a triangular groove, a boss, and a tension ball. The triangular groove is fixed to the rigid rotor. The end face of the protrusion has a guide slope to form an inclined slide rail; the upper end of the protrusion is embedded in the radial groove at the bottom of the magnetic adjustment rotor, the radial width of the radial groove is greater than the radial thickness of the upper end of the protrusion to form a movable gap, and the lower end of the protrusion forms an inclined sliding fit with the guide slope; the tension ball is disposed in the spherical cavity at the radial outer end of the protrusion and is limited; wherein: the tension ball generates centrifugal force as the motor rotates, driving the protrusion to slide obliquely along the guide slope, converting the centrifugal force into an axial component force to push the magnetic adjustment rotor to axial displacement, thereby adjusting the motor magnetic field.

2. The high-speed motor centrifugal magnet adjustment device according to claim 1, characterized in that: The inner hole of the magnetic rotor is provided with internal teeth that mesh with the toothed section, and the rigid rotor and the optical axis section are circumferentially fixed by interference fit or key connection.

3. The high-speed motor centrifugal magnet adjustment device according to claim 1, characterized in that: The bottom of the magnetic rotor is uniformly provided with multiple radial grooves along the circumference, and a radial movable gap is provided between each radial groove and the upper end of the corresponding boss.

4. The high-speed motor centrifugal magnet adjustment device according to claim 1, characterized in that: The boss has a three-section stepped structure, with a rectangular embedded head at the upper end, a sliding part matching the guide slope at the lower end, and a spherical cavity on the radial outer end face of the middle section.

5. The high-speed motor centrifugal magnet adjustment device according to claim 1, characterized in that: The tension ball is a spherical body that can only roll radially slightly relative to the boss by means of a cavity opening or a retaining ring.

6. The high-speed motor centrifugal magnet adjustment device according to claim 1, characterized in that: The guide ramp forms an acute angle with the axial direction.

7. The high-speed motor centrifugal magnet adjustment device according to claim 1, characterized in that: The triangular groove is fastened to the end face of the rigid rotor by bolts or integrally formed, and its guide slope surface is provided with a solid lubricating coating.

8. The high-speed motor centrifugal magnet adjustment device according to claim 1, characterized in that: The magnetic adjustment devices are evenly distributed along the circumference and multiple sets are provided.

9. The high-speed motor centrifugal magnet adjustment device according to claim 1, characterized in that: The static friction between the triangular groove and the boss is configured such that the centrifugal force drives the boss to slide only when the motor speed exceeds a preset threshold.

10. The high-speed motor centrifugal magnet adjustment device according to claim 1, characterized in that: When the magnetic rotor undergoes axial displacement, its axial relative position with the stator magnetic field changes, thereby adjusting the magnetic field coupling strength.

Images