Single-phase voltage-regulating speed-adjusting permanent magnet motor

Abstract

The application discloses a single-phase voltage-regulating and speed-regulating permanent magnet motor, which comprises a rotor and a stator, the rotor is coaxially arranged outside the stator, the rotor comprises a rotor core and a plurality of permanent magnets which are uniformly distributed in the circumferential direction, the stator comprises a stator core and a single-phase winding, the stator core is provided with a plurality of convex salient poles which are spaced apart in the circumferential direction, the single-phase winding comprises coils which are wound on the salient poles, and the coils on the plurality of salient poles are connected in series to form a single electric circuit; the permanent magnet motor further comprises a voltage regulating module, an output end of the voltage regulating module is connected with the single-phase winding; the voltage regulating module is provided with a voltage regulating signal interface and a state feedback module, is used for receiving an external speed-regulating instruction and regulating an output voltage, so as to change the rotating speed of the motor; and the state feedback module is used for outputting real-time voltage to an external device. The rotating speed of the rotor is controlled without depending on a mechanical speed-changing device, meanwhile, the state feedback module provides real-time voltage data, the external device is convenient to monitor the running state of the motor, and the controllability of the system is enhanced.

Description

Technical Field

[0001] This application relates to the field of electric motor technology, specifically to a single-phase voltage-regulating and speed-regulating permanent magnet motor. Background Technology

[0002] Permanent magnet synchronous motors (also known as permanent magnet motors or permanent magnet motors) are gradually replacing traditional induction motors due to their advantages such as high power density and high efficiency. However, current technologies are mostly focused on three-phase permanent magnet motor designs. Single-phase permanent magnet motors, due to their magnetic field asymmetry, are prone to torque pulsation and starting difficulties, which has limited their development for a long time. Existing technologies propose single-phase permanent magnet motors with an external rotor structure to suppress vibration by increasing rotor inertia. However, their stators still use distributed windings, resulting in excessively long winding ends and lacking integrated speed control functionality. This necessitates an external frequency converter for speed control, significantly increasing system costs. Currently, single-phase motor speed control mainly relies on two types of solutions: 1. Frequency conversion control, which achieves speed regulation by changing the power supply frequency through an inverter. Although it can maintain high efficiency, it requires the configuration of DC bus capacitors and various power electronic components, resulting in high circuit complexity and strong EMI interference, making it difficult to popularize in low-cost scenarios; 2. Voltage regulation control, which directly adjusts the motor terminal voltage. Although the structure is simple, traditional autotransformer voltage regulators or thyristor voltage regulation have problems such as waveform distortion and sudden torque drop in the low-speed range, making it difficult to meet the requirements of precise speed regulation. In existing technologies, although there are motor designs with integrated voltage regulation circuits, they are mostly designed for three-phase motors and lack closed-loop speed feedback and heat dissipation optimization structures, failing to meet the requirements of compactness and high reliability for single-phase motors. In addition, motor speed detection often uses external photoelectric encoders or Hall sensors, increasing axial dimensions and making the signal stability susceptible to assembly errors. Utility Model Content

[0003] This application provides a single-phase voltage-regulating and speed-regulating permanent magnet motor, which achieves efficient voltage regulation and speed regulation as well as high-precision speed control through structural integration and closed-loop control optimization, thereby improving or solving at least one of the above-mentioned technical problems to a certain extent.

[0004] The technical solution adopted in this application is as follows:

[0005] A single-phase voltage-regulating and speed-regulating permanent magnet motor includes a rotor and a stator, which are coaxially arranged with the rotor located outside the stator. The rotor includes a ring-shaped rotor core and a plurality of permanent magnets evenly distributed circumferentially on the rotor core. The stator includes a stator core and a single-phase winding. The stator core has a ring-shaped structure and a plurality of convex poles spaced circumferentially. The single-phase winding includes coils wound on the convex poles, and the coils on the plurality of convex poles are connected in series to form a single electrical circuit. The permanent magnet motor also includes a voltage regulation module, the output terminal of which is connected to the single-phase winding. The voltage regulation module is provided with a voltage regulation signal interface and a status feedback module for receiving external speed regulation commands and adjusting the output voltage to change the motor speed. The status feedback module is used to output the real-time voltage to an external device.

[0006] In this technical solution, the continuous speed regulation function of a single-phase permanent magnet motor is achieved by combining the permanent magnet structure formed by the rotor core and multiple permanent magnets in the outer rotor with the single-phase winding on the stator core, and by directly controlling the winding voltage through a voltage regulation module. The optimized outer rotor layout maximizes space utilization, the salient pole design of the toroidal stator core enhances magnetic field concentration, and the single electrical circuit simplifies winding configuration. The voltage regulation module receives external commands through a voltage regulation signal interface to dynamically adjust the output voltage, eliminating the need for mechanical speed changers for speed control. Simultaneously, the status feedback module provides real-time voltage data, facilitating external equipment monitoring of the motor's operating status and enhancing system controllability.

[0007] The permanent magnet motor also includes a speed detection unit for measuring the rotational speed of the rotor. The speed detection unit includes a sensor and a detection part. The detection part is located in the rotor core. The sensor realizes speed measurement by sensing the detection part. The output terminal of the sensor is connected to the feedback terminal of the voltage regulation module.

[0008] In this technical solution, by adding a speed detection unit to the permanent magnet motor, and through the cooperation of the detection part on the rotor core and the sensor, the physical quantity of the speed signal is converted into an electrical signal. This enables real-time monitoring of the rotor speed and adjustment of the voltage as needed. After connecting the sensor output to the feedback terminal of the voltage regulation module, a closed-loop speed control circuit is formed, which can automatically compensate for speed deviations caused by load fluctuations, significantly improving speed regulation accuracy and dynamic response performance.

[0009] The sensor is a photoelectric sensor, and the detection unit includes multiple reflectors. The multiple reflectors are evenly distributed circumferentially on one axial end face of the rotor core. The photoelectric sensor realizes speed measurement by sensing the reflected light of the reflectors.

[0010] This technical solution employs a combination of a photoelectric sensor and circumferentially distributed reflectors to achieve non-contact speed measurement by leveraging the proportional relationship between the frequency of reflected light pulses and the rotational speed. Compared to electromagnetic sensors, this solution offers stronger resistance to electromagnetic interference, and the periodic distribution design of the reflectors improves signal acquisition resolution, making it particularly suitable for accurate speed measurement in high-speed rotation scenarios. The reflectors are positioned on one axial end face of the rotor core, saving radial space and adapting to the compact rotor structure requirements.

[0011] The photoelectric sensor is fixed to the axial end face of the stator core.

[0012] In this technical solution, the photoelectric sensor is fixed on the axial end face of the stator core, and the sensor is arranged using the axial gap between the stator and the rotor. This eliminates the need for additional housing space and optimizes the internal structural layout. At the same time, it shortens the distance between the sensor and the detection unit, enhances the signal strength, and reduces external interference.

[0013] The permanent magnet motor also includes a housing surrounding the rotor and the stator, and the photoelectric sensor is fixed to the inner wall of the housing.

[0014] In this technical solution, the photoelectric sensor is fixed to the inner wall of the housing to avoid direct contact between the photoelectric sensor and the stator core, thereby reducing the impact of stator heating on sensor performance. The installation on the inner wall of the housing facilitates modular assembly during mass production, reducing process complexity.

[0015] A first mounting groove is provided on one axial end face of the stator core, and the voltage regulation module is embedded in the first mounting groove.

[0016] In this technical solution, a first mounting groove is provided on the axial end face of the stator core for embedding the voltage regulation module, realizing the integrated design of the voltage regulation module and the stator core, reducing the length of internal leads and lowering the risk of electromagnetic interference; at the same time, given that the stator core is made of metal, the metal material of the stator core can also be used to assist in heat dissipation, improving the thermal stability of the voltage regulation module.

[0017] The permanent magnet motor also includes a housing surrounding the rotor and the stator, the inner wall of the housing is provided with a second mounting groove, and the voltage regulation module is embedded in the second mounting groove.

[0018] In this technical solution, the voltage regulation module is fixed by the second mounting slot on the inner wall of the housing, making full use of the redundant space inside the housing and avoiding interference with the moving parts of the stator and rotor; the housing, as a heat dissipation medium, can expand the heat dissipation area and further optimize the temperature rise performance of the voltage regulation module.

[0019] The voltage regulation module is a single-phase PWM voltage regulation module, and the input terminal of the single-phase PWM voltage regulation module is connected to a single-phase AC power supply; or, the voltage regulation module is a single-phase autotransformer voltage regulation module, and the input terminal of the single-phase autotransformer voltage regulation module is connected to a single-phase AC power supply.

[0020] In this technical solution, the voltage regulation module is limited to a single-phase PWM voltage regulation module or a single-phase autotransformer voltage regulation module, clearly defining the voltage regulation scheme adapted to single-phase power supply. The PWM voltage regulation module achieves efficient voltage regulation through high-frequency chopping, reducing energy loss; while the single-phase autotransformer voltage regulation module adjusts the output voltage through mechanical contacts, which is lower in cost and has strong anti-interference ability, providing users with diversified choices.

[0021] The rotor core includes multiple fan-shaped core blocks. One end of each core block has a protruding dovetail-shaped protrusion, and the other end has a recessed dovetail-shaped groove. Multiple core blocks are connected end to end to form a ring structure through the cooperation of the dovetail-shaped protrusion and the dovetail-shaped groove.

[0022] In this technical solution, the rotor core adopts a splicing structure of dovetail protrusions and dovetail grooves, which simplifies the processing difficulty of the annular core structure (no need for overall punching) and reduces material costs; the dovetail connection ensures that each core block is accurately aligned, reduces the cumulative error of the permanent magnet installation position, and improves the rotor dynamic balance performance.

[0023] The rotor core is provided with a plurality of permanent magnet mounting slots evenly distributed along the circumference, and the plurality of permanent magnets are inserted into the permanent magnet mounting slots one by one.

[0024] In this technical solution, the circumferentially uniformly distributed design of the permanent magnet mounting slot makes the magnetic field symmetry of the permanent magnet better and suppresses torque pulsation; the matching shape of the permanent magnet mounting slot with the permanent magnet can reduce air gap magnetic resistance, improve magnetic energy utilization, and at the same time prevent the permanent magnet from falling off due to centrifugal force, thus enhancing reliability. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0026] Figure 1 This is an assembly diagram of a single-phase voltage-regulating and speed-regulating permanent magnet motor provided in an embodiment of this application;

[0027] Figure 2 This is a schematic diagram of the stator core structure provided in the embodiments of this application;

[0028] Figure 3 This is a schematic diagram of the rotor core structure provided in the embodiments of this application;

[0029] Figure 4 This is a cross-sectional view of a partial structure of a single-phase voltage-regulating and speed-regulating permanent magnet motor provided in an embodiment of this application;

[0030] Figure 5 This is a schematic diagram of the structure of the iron core block provided in the embodiment of this application.

[0031] List of components and reference numerals:

[0032] 1 rotor core, 11 core blocks, 111 dovetail protrusions, 112 dovetail grooves, 12 permanent magnet mounting slots;

[0033] 2 permanent magnets;

[0034] 3 stator core, 31 salient pole, 32 first mounting slot;

[0035] 4 coils;

[0036] 5. Voltage regulation module;

[0037] 6 sensors;

[0038] 7 reflective elements;

[0039] 8. Outer shell, 81. Second mounting slot. Detailed Implementation

[0040] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0041] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0042] Furthermore, it should be understood in the description of this application that the terms "upper," "lower," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "lateral," and "longitudinal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0045] In the embodiments of this application, a single-phase voltage-regulating and speed-regulating permanent magnet motor is provided. For ease of explanation and understanding, the following content provided in this application is based on the illustrated product structure. Of course, those skilled in the art will understand that the above structure is only a specific example and illustrative illustration, and does not constitute a specific limitation on the technical solution provided in this application.

[0046] Reference Figures 1 to 5 As shown, the single-phase voltage-regulating and speed-regulating permanent magnet motor provided in this application includes a rotor and a stator, which are coaxially arranged with the rotor located outside the stator. The rotor includes a rotor core 1 with a ring structure and multiple permanent magnets 2 evenly distributed circumferentially on the rotor core 1. The stator includes a stator core 3 and a single-phase winding. The stator core 3 has a ring structure and multiple convex poles 31 spaced circumferentially. The single-phase winding includes coils 4 wound on the convex poles 31, and the coils 4 on the multiple convex poles 31 are connected in series to form a single electrical circuit. The permanent magnet motor also includes a voltage regulation module 5, the output terminal of which is connected to the single-phase winding. The voltage regulation module 5 is provided with a voltage regulation signal interface and a status feedback module for receiving external speed regulation commands and adjusting the output voltage to change the motor speed. The status feedback module is used to output the real-time voltage to external devices. Specifically, Figure 2The figure shows an embodiment where the stator core 3 has 16 salient poles 31. The coils 4 can be wound sinusoidally and connected in series to form a single circuit. The permanent magnets 2 can be glued to the inside of the rotor core 1 with epoxy resin or embedded in the rotor core 1. The figure does not limit the connection method between the output terminal of the voltage regulation module 5 and the single-phase winding. It can be connected by wires that are externally distributed on the stator core 3 or by wires that are embedded in the stator core 3. In this technical solution, the combination design of the permanent magnet structure formed by the rotor core 1 and multiple permanent magnets 2 in the rotor and the single-phase winding on the stator core 3, combined with the direct control of the winding voltage by the voltage regulation module 5, realizes the continuous speed regulation function of the single-phase permanent magnet motor. Its rotor layout optimizes space utilization, the salient pole 31 design of the annular stator core 3 enhances the magnetic field concentration, and the single electrical circuit simplifies the winding configuration. The voltage regulation module 5 receives external commands through the voltage regulation signal interface to dynamically adjust the output voltage, eliminating the need for mechanical speed control. Simultaneously, the status feedback module provides real-time voltage data to external devices (such as handheld terminals and computer terminals), facilitating monitoring of the motor's operating status and enhancing system controllability. The voltage regulation signal interface is not shown in the figure; it can be integrated into the outer casing of the permanent magnet motor. The voltage regulation signal interface can be a digital interface, an analog signal interface, etc.; alternatively, it can include a potentiometer interface and a zero-crossing trigger interface to ensure the integrity of the voltage waveform during single-phase voltage regulation and avoid torque pulsation caused by asynchronous voltage regulation.

[0047] Regarding the specific structure of voltage regulation module 5, as a preferred embodiment, voltage regulation module 5 is a single-phase PWM voltage regulation module. The single-phase PWM voltage regulation module mainly includes a single-phase full-bridge rectifier circuit, a power switching transistor, a PWM controller, and a drive circuit. The AC side of the rectifier bridge is connected to a single-phase AC power supply. The PWM controller controls the duty cycle of the power switching transistor through the drive circuit, outputting a variable voltage to the single-phase winding. The PWM voltage regulation module achieves efficient voltage regulation through high-frequency chopping, reducing energy loss. As an alternative preferred embodiment, voltage regulation module 5 is a single-phase autotransformer voltage regulation module. The single-phase autotransformer voltage regulation module mainly includes a toroidal core, carbon brush sliding contacts, and winding taps. The primary winding of the single-phase autotransformer voltage regulation module is connected to a single-phase AC power supply, and the secondary sliding contacts are connected to the single-phase winding. The output voltage is adjusted by changing the contact position, resulting in lower cost and stronger anti-interference capabilities.

[0048] As a preferred embodiment of this application, such as Figure 1As shown, the permanent magnet motor also includes a speed detection unit for measuring the rotor speed. The speed detection unit includes a sensor 6 and a detection section. The detection section is located on the rotor core 1. The sensor 6 measures the speed by sensing the detection section. The output of the sensor 6 is connected to the feedback terminal of the voltage regulation module 5. In this technical solution, by adding a speed detection unit to the permanent magnet motor, and through the cooperation of the detection section on the rotor core 1 and the sensor 6, the physical quantity of the speed signal is converted into an electrical signal, enabling real-time monitoring of the rotor speed and adjustment of the voltage as needed. After connecting the output of the sensor 6 to the feedback terminal of the voltage regulation module 5, a closed-loop speed control circuit is formed, which can automatically compensate for speed deviations caused by load fluctuations, significantly improving speed regulation accuracy and dynamic response performance. For example, in practical applications, when the rotor speed is detected to be lower than the set value, the output voltage can be automatically increased; conversely, the voltage is reduced to maintain a constant speed.

[0049] In a preferred embodiment, such as Figure 1 and Figure 3 As shown, sensor 6 is a photoelectric sensor. The detection unit includes multiple reflectors 7, which are evenly distributed circumferentially on one axial end face of the rotor core 1. The photoelectric sensor measures the rotational speed by sensing the reflected light from the reflectors 7. Preferably, the photoelectric sensor can be a reflective photoelectric sensor containing an infrared emitting tube and a receiving tube. The reflectors 7 can be made of high-reflectivity materials, such as silver-plated patches or reflective ceramic coatings. The multiple reflectors 7 are evenly distributed circumferentially to form equally spaced reflective marks. When the rotor rotates, the reflective marks periodically reflect light, and sensor 6 outputs a pulse signal. More preferably, the reflectors 7 can be glued to the rotor core 1 with epoxy adhesive. By combining the photoelectric sensor with the circumferentially distributed reflectors 7, non-contact speed measurement is achieved through the proportional relationship between the reflected light pulse frequency and the rotational speed. Compared with electromagnetic sensors, this solution has stronger anti-electromagnetic interference capability, and the periodic distribution design of the reflectors 7 can improve signal acquisition resolution, making it particularly suitable for accurate speed measurement in high-speed rotation scenarios. The reflector 7 is arranged on one axial end face of the rotor core 1, saving radial space and adapting to the compact rotor structure requirements. In the specific workflow, the speed control command output by the external device is input through the voltage regulation signal interface; the voltage regulation module 5 adjusts the output voltage to drive the permanent magnet motor to the target speed; the photoelectric sensor detects the speed in real time and feeds it back to the voltage regulation module 5 for closed-loop voltage correction; the status feedback module outputs real-time voltage data.

[0050] This application does not limit the placement of the photoelectric sensor, and the following embodiments can be adopted:

[0051] Example 1: As Figure 1As shown, the photoelectric sensor is fixed to the axial end face of the stator core 3. The sensor 6 is arranged using the axial gap between the stator and the rotor, eliminating the need for additional space in the outer casing 8 and optimizing the internal structural layout. Simultaneously, it shortens the distance between the sensor 6 and the detection unit, enhancing signal strength and reducing external interference. In specific implementations, a groove can be cut into the axial end face of the stator core 3, and the photoelectric sensor can be encapsulated in the groove with high-temperature resistant epoxy resin, with the surface covered by a polyimide protective film. Alternatively, a threaded insert can be pre-embedded in the axial end face of the stator core 3, and the photoelectric sensor can be fixed to the threaded insert by a bracket.

[0052] Example 2: Figure 4 As shown, the permanent magnet motor also includes a housing 8 surrounding the rotor and stator, with the photoelectric sensor fixed to the inner wall of the housing 8. The figure only illustrates a portion of the structure of the housing 8 and does not represent the entire housing 8 or limit the scope of this solution. In this technical solution, fixing the photoelectric sensor to the inner wall of the housing 8 avoids direct contact between the photoelectric sensor and the stator core 3, reducing the impact of stator heating on the performance of the sensor 6. The installation on the inner wall of the housing 8 facilitates modular assembly during mass production, reducing process complexity. The method of fixing the photoelectric sensor to the inner wall of the housing 8 can refer to the method of fixing the photoelectric sensor to the stator core 3 in the aforementioned embodiment one.

[0053] In other embodiments, the sensor can also be configured as a through-beam photoelectric sensor, with the detection part being an annular hollow code disk. The code disk has evenly distributed light-transmitting holes or grooves around its circumference. When the light-transmitting holes of the code disk are aligned with the optical path of the through-beam photoelectric sensor, the receiving end outputs a high level; when blocked, it outputs a low level, forming a square wave pulse. The rotational speed is calculated by converting the pulse frequency, and the accuracy is determined by the number of holes in the code disk.

[0054] Regarding the location of the voltage regulation module 5, this application does not limit it, and the following embodiments can be adopted:

[0055] Example 3: Figure 1 and Figure 2 As shown, a first mounting groove 32 is provided on one axial end face of the stator core 3. The voltage regulation module 5 is embedded in the first mounting groove 32, realizing the integrated design of the voltage regulation module 5 and the stator core 3, reducing the length of internal leads and lowering the risk of electromagnetic interference. Furthermore, given that the stator core 3 is made of metal, the metal material of the stator core 3 can also be used to assist in heat dissipation, improving the thermal stability of the voltage regulation module 5.

[0056] Example 4: Figure 4As shown, the permanent magnet motor also includes a housing 8 surrounding the rotor and stator. The inner wall of the housing 8 is provided with a second mounting groove 81. The voltage regulation module 5 is embedded in the second mounting groove 81, making full use of the redundant space inside the housing 8 and avoiding interference with the moving parts of the stator and rotor. The housing 8, as a heat dissipation medium, can expand the heat dissipation area and further optimize the temperature rise performance of the voltage regulation module 5.

[0057] Preferably, in both Embodiments 3 and 4, thermal grease can be further applied to the voltage regulation module 5 to make close contact with the wall of the first mounting groove 32 or the second mounting groove 81, forming a heat conduction path.

[0058] As a preferred embodiment of this application, such as Figure 3 and Figure 5 As shown, the rotor core 1 includes multiple fan-shaped core blocks 11. One end of each core block 11 has a protruding dovetail-shaped protrusion 111, and the other end has a recessed dovetail-shaped groove 112. The multiple core blocks 11 are connected end to end to form a ring structure through the cooperation of the dovetail-shaped protrusion 111 and the dovetail-shaped groove 112. Figure 5 The diagram shows the structure of a single iron core block 11, as follows: Figure 3 The diagram shows a rotor core 1 with four iron core blocks 11 connected end-to-end through the engagement of dovetail protrusions 111 and dovetail grooves 112, forming a closed ring structure. It should be noted that the inclusion of four iron core blocks 11 in the rotor body shown in the diagram does not limit this application; other suitable numbers of iron core blocks 11 can be used. Adjacent iron core blocks 11 can have the same arc length or different arc lengths. The dovetail protrusions 111 and dovetail grooves 112 of the rotor core 1 simplify the processing difficulty of the ring-shaped iron core structure (eliminating the need for overall punching) and reduce material costs. The dovetail connection ensures precise alignment of each iron core block 11, reducing the cumulative error in the installation position of the permanent magnet 2 and improving the rotor's dynamic balance performance.

[0059] Furthermore, such as Figure 1 , Figure 3 and Figure 5 As shown, the rotor core 1 is provided with multiple permanent magnet mounting slots 12 evenly distributed circumferentially, and multiple permanent magnets 2 are inserted one-to-one into the permanent magnet mounting slots 12. In this technical solution, the circumferentially evenly distributed design of the permanent magnet mounting slots 12 makes the magnetic field symmetry of the permanent magnets 2 better and suppresses torque pulsation; the shape matching between the permanent magnet mounting slots 12 and the permanent magnets 2 can reduce air gap magnetic resistance, improve magnetic energy utilization, and at the same time prevent the permanent magnets 2 from falling off due to centrifugal force, thus enhancing reliability. In a preferred embodiment, epoxy resin adhesive can be pre-applied in the permanent magnet mounting slots 12 or on the surface of the permanent magnets 2 to bond the permanent magnets 2 to the permanent magnet mounting slots 12, further improving installation reliability.

[0060] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0061] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0062] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A single-phase voltage-regulating and speed-regulating permanent magnet motor, the permanent magnet motor comprising a rotor and a stator, the rotor and stator being arranged coaxially with the rotor located outside the stator, characterized in that, The rotor includes a rotor core with a ring structure and a plurality of permanent magnets evenly distributed on the rotor core in the circumferential direction. The stator includes a stator core and a single-phase winding. The stator core has a ring structure and a plurality of convex poles are spaced apart in the circumferential direction. The single-phase winding includes a coil wound on the convex pole. The coils on the plurality of convex poles are connected in series to form a single electrical circuit. The permanent magnet motor also includes a voltage regulation module, the output of which is connected to the single-phase winding; the voltage regulation module is provided with a voltage regulation signal interface and a status feedback module, which are used to receive external speed regulation commands and adjust the output voltage to change the motor speed; The status feedback module is used to output the real-time voltage to external devices.

2. The single-phase voltage-regulating and speed-regulating permanent magnet motor according to claim 1, characterized in that, The permanent magnet motor also includes a speed detection unit for measuring the rotational speed of the rotor. The speed detection unit includes a sensor and a detection part. The detection part is located in the rotor core. The sensor realizes speed measurement by sensing the detection part. The output terminal of the sensor is connected to the feedback terminal of the voltage regulation module.

3. A single-phase voltage-regulating and speed-regulating permanent magnet motor according to claim 2, characterized in that, The sensor is a photoelectric sensor, and the detection unit includes multiple reflectors. The multiple reflectors are evenly distributed circumferentially on one axial end face of the rotor core. The photoelectric sensor realizes speed measurement by sensing the reflected light of the reflectors.

4. A single-phase voltage-regulating and speed-regulating permanent magnet motor according to claim 3, characterized in that, The photoelectric sensor is fixed to the axial end face of the stator core.

5. A single-phase voltage-regulating and speed-regulating permanent magnet motor according to claim 3, characterized in that, The permanent magnet motor also includes a housing surrounding the rotor and the stator, and the photoelectric sensor is fixed to the inner wall of the housing.

6. A single-phase voltage-regulating and speed-regulating permanent magnet motor according to claim 1, characterized in that, A first mounting groove is provided on one axial end face of the stator core, and the voltage regulation module is embedded in the first mounting groove.

7. A single-phase voltage-regulating and speed-regulating permanent magnet motor according to claim 1, characterized in that, The permanent magnet motor also includes a housing surrounding the rotor and the stator, the inner wall of the housing is provided with a second mounting groove, and the voltage regulation module is embedded in the second mounting groove.

8. A single-phase voltage-regulating and speed-regulating permanent magnet motor according to claim 1, characterized in that, The voltage regulation module is a single-phase PWM voltage regulation module, and the input terminal of the single-phase PWM voltage regulation module is connected to a single-phase AC power supply. Alternatively, the voltage regulation module may be a single-phase autotransformer voltage regulator module, the input of which is connected to a single-phase AC power supply.

9. A single-phase voltage-regulating and speed-regulating permanent magnet motor according to claim 1, characterized in that, The rotor core includes multiple fan-shaped core blocks. One end of each core block has a protruding dovetail-shaped protrusion, and the other end has a recessed dovetail-shaped groove. Multiple core blocks are connected end to end to form a ring structure through the cooperation of the dovetail-shaped protrusion and the dovetail-shaped groove.

10. A single-phase voltage-regulating and speed-regulating permanent magnet motor according to claim 9, characterized in that, The rotor core is provided with a plurality of permanent magnet mounting slots evenly distributed along the circumference, and the plurality of permanent magnets are inserted into the permanent magnet mounting slots one by one.

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