High-efficiency high-power single-phase motor and control method thereof

Abstract

The invention discloses a high-efficiency high-power single-phase motor and a control method thereof, and the method can enable the single-phase motor to have the positioning torque and smooth starting capability through the arrangement of a Hall sensor in advance, the digging of steps on the poles of a stator, and the regulation and control of the starting duty ratio on a controller. The motor is controlled in the mode that the whole commutation period follows according to the frequency of the Hall signal, and the square wave duty ratio is adjusted according to the power, so that the switching frequency is greatly reduced, the problem of high loss in the prior art is solved, the working efficiency of the motor is improved, and the service life of the motor is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of single-phase motors, in particular to the technical field of a high-efficiency high-power single-phase motor and its control method. Background Art

[0002] Motors are classified into single-phase motors and three-phase motors according to the number of phases of the power supply. The number of phases refers to the number of phases of the alternating current received by the motor, that is, the number of phases of the alternating current provided by the electronic device. Among them, three-phase motors usually have higher power output and efficiency than single-phase motors and are suitable for devices that require high power and long-term operation. In terms of motor starting and control, since a single-phase motor has only one-phase power supply during starting, it usually faces the problem of insufficient starting torque during starting and requires a starting capacitor to be connected in parallel with the starting coil of the motor to improve the starting performance of the motor, provide sufficient starting torque, and enable the motor to start and operate smoothly. In contrast, three-phase motors are easier to achieve automatic starting and precise control in design. Almost all existing motors use PWM to adjust the speed and direction of the motor. However, the PWM control method has the following problems: 1. High-frequency switching loss: In PWM control, the drive circuit continuously switches the on-off state of the current. Each time the switch operates, spikes will be generated in the current and voltage instantaneously, resulting in energy loss. Moreover, the higher the switching frequency, the more switch operations, and the accumulated switching loss will also increase; 2. Electromagnetic interference and other loss problems: High-frequency switching will generate electromagnetic interference, which will not only affect other electronic devices but also may reduce the efficiency of its own circuit. High-frequency signals will generate noise in the circuit and require additional filters to suppress, which increases the system complexity and loss. Moreover, the interference may affect the sensitive components in the motor controller, resulting in a decline in system performance; 3. Losses caused by high frequency: First, there is core loss. The high-frequency magnetic field change will generate eddy currents in the core, increasing the core loss. Moreover, the high-frequency switching will increase the area of the hysteresis loop, increasing the hysteresis loss. Second, there is winding loss. Due to the skin effect, high-frequency current will flow on the surface of the wire, increasing the equivalent resistance of the wire, resulting in additional I²R loss. Moreover, high-frequency voltage may affect the insulation material of the winding, leading to aging and increased loss of the insulation material. The above problems directly affect the efficiency and lifespan of the motor. Therefore, it is very necessary to develop a new control method to improve the motor efficiency, reduce losses, and extend the service life. Summary of the Invention

[0003] The purpose of the present invention is to solve the problems in the prior art and to propose a high-efficiency, high-power single-phase motor and a control method thereof. The single-phase motor can have the ability of positioning torque and smooth starting by placing a Hall sensor in advance, digging steps on the stator poles, and adjusting the starting duty cycle on the controller. Instead of using PWM, a method called full-open is used to control the motor, which greatly reduces the switching frequency, thereby solving the high loss problem in the prior art and improving the working efficiency and service life of the motor.

[0004] To achieve the above-mentioned purpose, the present invention proposes a high-efficiency, high-power single-phase motor, comprising a motor body, a stator assembly, an inner rotor assembly and a control center, wherein the motor body is provided with a stator assembly, wherein the stator assembly comprises a stator core, a stator winding and a Hall sensor, wherein the stator winding is wound on the stator core, wherein the stator core is radially provided with a stator step groove at each pole pair position, wherein a plurality of Hall sensors are fixedly provided in the stator step groove, wherein an inner rotor assembly is provided on the inner side of the stator assembly, wherein the inner rotor assembly comprises a rotor silicon steel sheet and a strong magnetic permanent magnet, wherein the rotor A plurality of positioning through-slots are arranged at the edge of the silicon steel sheet, the strong magnetic permanent magnet is arranged through the positioning through-slots, an axis through-slot is axially arranged through the center position of the rotor silicon steel sheet, a connecting shaft is arranged through the axis through-slot, a reduction gear is arranged on the outside of the motor body, a rotating bearing is axially arranged inside the reduction gear, one end of the connecting shaft passes through the inner wall of the rotating bearing and is fixedly connected to a plurality of fan blades, a control center is arranged in the motor body, and the control center is respectively connected to the Hall sensor, the stator winding, the reduction gear and the inner rotor assembly.

[0005] Preferably, the installation position angle of the Hall sensor is located in front of the installation position angle of the strong magnetic permanent magnet.

[0006] Preferably, the stator core comprises stator silicon steel sheets and an insulating bracket, a plurality of stator silicon steel sheets are uniformly compressed and assembled in the insulating bracket, and the stator winding is an oxygen-free copper wire winding, and the oxygen-free copper wire is tightly wound around the outside of the insulating bracket to form a coil stator winding.

[0007] Preferably, there are multiple rotor silicon steel sheets, which are evenly stacked and fixed together. The rotor silicon steel sheets are circular silicon steel sheets. The positioning through-slots are evenly arranged around the edges of the rotor silicon steel sheets. The positioning through-slots are square through-slots. The strong magnetic permanent magnets are in the shape of a rectangular parallelepiped and are fixedly embedded in the positioning through-slots.

[0008] Preferably, the pole pair of the stator core is in the shape of an arc, a support plate is radially arranged at the center position of the outer side surface of the pole pair of the stator core, the stator step groove is arranged at one end of the inner side surface of the pole pair of the stator core, the shape of the stator step groove is in the shape of an arc, the stator step groove and the inner side surface of the pole pair of the stator core are parallel to each other, and the length of the stator step groove is half the length of the pole pair of the stator core.

[0009] Preferably, an inner groove opening outward is provided on the inner side surface of the pole pair of the stator core corresponding to the position of the stator step groove, and the Hall sensor is fixedly installed in the inner groove.

[0010] Preferably, the control center includes a power supply circuit, a control circuit, a drive circuit, and a circuit board consisting of a switch and a serial port. The circuit board integrates the power supply circuit, the control circuit and the drive circuit. The power supply circuit supplies power to the control circuit and the drive circuit. The control circuit is composed of a single-chip microcomputer and an internal program. The drive circuit is composed of an H-bridge and a drive unit. The control circuit controls the drive circuit to output a fully-open signal.

[0011] Preferably, the H-bridge circuit includes a control switch Q1, a control switch Q2, a control switch Q3, a control switch Q4, an inductor L and a resistor R, the control switch Q1 and the control switch Q2 are arranged in parallel, one end of the control switch Q1 is connected to one end of the inductor L, one end of the control switch Q2 is connected to the other end of the inductor L, the control switch Q3 and the control switch Q4 are arranged in parallel, one end of the control switch Q3 is connected to one end of the inductor L, one end of the control switch Q4 is connected to the other end of the inductor L, the control switch Q3 and the control switch Q4 are connected in parallel to the resistor R, and one end of the resistor R is grounded.

[0012] To achieve the above object, the present invention proposes a high-efficiency high-power single-phase motor control method, which comprises the following steps in sequence: Step 1: Turn on the power supply, start the motor body, and control the control center to regularly switch the control switch Q1, the control switch Q2, the control switch Q3, and the control switch Q4, so that the inductor L passes a square wave with a duty cycle; Step 2: determine the position of the inner rotor assembly according to the Hall sensor placed in advance, and then transmit the Hall sensor information to the control center; Step 3: The control center pushes the start duty cycle according to the position information of the inner rotor assembly transmitted by the Hall sensor; Step 4: The control center determines whether the rotor is blocked according to the position information of the inner rotor assembly transmitted by the Hall sensor. If it is blocked, the duty cycle is stopped; otherwise, the duty cycle is continued to be pushed according to the position of the inner rotor assembly, and then a judgment is made as to whether the full speed is reached; Step 5: The control center detects that the full-open speed has not been reached based on the position information of the inner rotor assembly transmitted by the Hall sensor, and continues to push the duty cycle; otherwise, it enters the full-open mode, and the entire commutation cycle follows the frequency of the Hall sensor signal, where the square wave duty cycle is adjusted according to the power size.

[0013] Beneficial effects of the present invention: The present invention uses the use of pre-placed Hall sensors and steps dug out on the stator poles and the controller to adjust the starting duty cycle, so that the single-phase motor has the ability to locate the torque and start smoothly. The entire commutation cycle is followed according to the frequency of the Hall signal, and the square wave duty cycle is adjusted according to the power size to control the motor, which greatly reduces the switching frequency, thereby solving the high loss problem in the prior art and improving the working efficiency and service life of the motor.

[0014] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a high-efficiency, high-power single-phase motor of the present invention; Figure 2 It is a schematic cross-sectional structure diagram of a high-efficiency, high-power single-phase motor of the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of a stator step groove of a high-efficiency, high-power single-phase motor of the present invention; Figure 4 It is a flow chart of a control method of a high-efficiency, high-power single-phase motor according to the present invention; Figure 5 The present invention is a schematic diagram of an H-bridge circuit structure of a high-efficiency, high-power single-phase motor.

[0016] In the figure: 1-stator silicon steel sheet, 2-connecting shaft, 3-rotor silicon steel sheet, 4-insulating bracket, 5-strong magnetic permanent magnet, 6-stator winding. DETAILED DESCRIPTION

[0017] Example 1: See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5The present invention discloses a high-efficiency, high-power single-phase motor, comprising a motor body, a stator assembly, an inner rotor assembly and a control center. The motor body is provided with a stator assembly, the stator assembly comprises a stator core, a stator winding 6 and a Hall sensor, the stator winding 6 is wound on the stator core, the stator core is radially provided with a stator silicon steel sheet 1 slot at each pole pair position, a plurality of Hall sensors are fixedly provided in the stator silicon steel sheet 1 slot, an inner rotor assembly is provided on the inner side of the stator assembly, the inner rotor assembly comprises a rotor silicon steel sheet 3 and a strong magnetic permanent magnet 5, a plurality of positioning through-slots are provided at the edge of the rotor silicon steel sheet 3, the strong magnetic permanent magnet 5 is penetrated and provided in the positioning In the through-slot, an axial through-slot is axially penetrated at the center position of the rotor silicon steel sheet 3, a connecting shaft 2 is penetrated in the axial through-slot, a reduction gear is arranged on the outside of the motor body, a rotating bearing is axially arranged inside the reduction gear, one end of the connecting shaft 2 passes through the inner wall of the rotating bearing and is fixedly connected to a plurality of fan blades, a control center is arranged in the motor body, and the control center is respectively connected to the Hall sensor, the stator winding 6, the reduction gear and the inner rotor assembly one by one, the installation position angle of the Hall sensor is located in front of the installation position angle of the strong magnetic permanent magnet 5, the pole pair shape of the stator core is arc-shaped, and the outer side of the pole pair of the stator core A support sheet is radially arranged at the center of the surface, the stator silicon steel sheet 1 slot is arranged at one end of the inner side of the pole pair of the stator core, the shape of the stator silicon steel sheet 1 slot is arc-shaped, the stator silicon steel sheet 1 slot and the inner side of the pole pair of the stator core are parallel to each other, the length of the stator silicon steel sheet 1 slot is half of the length of the pole pair of the stator core, the control center includes a power supply circuit, a control circuit, a drive circuit and a circuit board composed of a switch and a serial port, the circuit board integrates the power supply circuit, the control circuit and the drive circuit, the power supply circuit supplies power to the control circuit and the drive circuit, the control circuit is composed of a single-chip microcomputer and an internal program, the drive circuit is composed of an H-bridge and a drive unit, The control circuit controls the drive circuit to output a full-on signal. The H-bridge circuit includes a control switch Q1, a control switch Q2, a control switch Q3, a control switch Q4, an inductor L and a resistor R. The control switch Q1 and the control switch Q2 are arranged in parallel, one end of the control switch Q1 is connected to one end of the inductor L, and one end of the control switch Q2 is connected to the other end of the inductor L. The control switch Q3 and the control switch Q4 are arranged in parallel, one end of the control switch Q3 is connected to one end of the inductor L, and one end of the control switch Q4 is connected to the other end of the inductor L. The control switch Q3 and the control switch Q4 are connected in parallel to the resistor R, and one end of the resistor R is grounded.

[0018] Example 2: See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5The present invention discloses a high-efficiency, high-power single-phase motor, comprising a motor body, a stator assembly, an inner rotor assembly and a control center. The motor body is provided with a stator assembly, the stator assembly comprises a stator core, a stator winding 6 and a Hall sensor, the stator winding 6 is wound on the stator core, the stator core is radially provided with a stator silicon steel sheet 1 slot at each pole pair position, a plurality of Hall sensors are fixedly provided in the stator silicon steel sheet 1 slot, an inner rotor assembly is provided on the inner side of the stator assembly, the inner rotor assembly comprises a rotor silicon steel sheet 3 and a strong magnetic permanent magnet 5, a plurality of positioning through-slots are provided at the edge of the rotor silicon steel sheet 3, the strong magnetic permanent magnet 5 is penetrated in the positioning through-slots, and the center position of the rotor silicon steel sheet 3 is axially penetrated A shaft through groove is provided, and a connecting shaft 2 is provided through the shaft through groove, a reduction gear is provided on the outer side of the motor body, and a rotating bearing is provided axially inside the reduction gear, and one end of the connecting shaft 2 passes through the inner wall of the rotating bearing and is fixedly connected to a plurality of fan blades, a control center is provided in the motor body, and the control center is respectively connected to the Hall sensor, the stator winding 6, the reduction gear and the inner rotor assembly one by one, and the installation position angle of the Hall sensor is located in front of the installation position angle of the strong magnetic permanent magnet 5, and the number of the rotor silicon steel sheets 3 is multiple, and the multiple rotor silicon steel sheets 3 are evenly stacked and fixed together, and the rotor silicon steel sheet 3 is a circular silicon steel sheet, and the positioning through slots are evenly arranged around the edge of the rotor silicon steel sheet 3. The edge of the positioning slot is a square through slot, the shape of the strong magnetic permanent magnet 5 is a rectangular parallelepiped, the strong magnetic permanent magnet 5 is fixedly embedded in the positioning slot, the pole pair shape of the stator core is an arc shape, and a support sheet is radially arranged at the center position of the outer side of the pole of the stator core, the stator silicon steel sheet 1 slot is arranged at one end of the inner side of the pole pair of the stator core, the shape of the stator silicon steel sheet 1 slot is an arc shape, the stator silicon steel sheet 1 slot and the inner side of the pole pair of the stator core are parallel to each other, and the length of the stator silicon steel sheet 1 slot is half the length of the pole pair of the stator core, the control center includes a power supply circuit, a control circuit, a drive circuit, and a circuit board composed of a switch and a serial port, the circuit board integrates the power supply circuit, the control circuit and the drive circuit, the The power supply circuit supplies power to the control circuit and the drive circuit. The control circuit is composed of a single chip microcomputer and an internal program. The drive circuit is composed of an H bridge and a drive unit. The control circuit controls the drive circuit to output a full-on signal. The H bridge circuit includes a control switch Q1, a control switch Q2, a control switch Q3, a control switch Q4, an inductor L and a resistor R. The control switch Q1 and the control switch Q2 are arranged in parallel, one end of the control switch Q1 is connected to one end of the inductor L, and one end of the control switch Q2 is connected to the other end of the inductor L. The control switch Q3 and the control switch Q4 are arranged in parallel, one end of the control switch Q3 is connected to one end of the inductor L, and one end of the control switch Q4 is connected to the other end of the inductor L.The control switch Q3 and the control switch Q4 are connected in parallel to a resistor R, and one end of the resistor R is grounded.

[0019] Example 3: See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5The present invention discloses a high-efficiency, high-power single-phase motor, comprising a motor body, a stator assembly, an inner rotor assembly and a control center. The motor body is provided with a stator assembly, the stator assembly comprises a stator core, a stator winding 6 and a Hall sensor, the stator winding 6 is wound on the stator core, the stator core is radially provided with a stator silicon steel sheet 1 slot at each pole pair position, a plurality of Hall sensors are fixedly provided in the stator silicon steel sheet 1 slot, an inner rotor assembly is provided on the inner side of the stator assembly, the inner rotor assembly comprises a rotor silicon steel sheet 3 and a strong magnetic permanent magnet 5, a plurality of positioning through-slots are provided at the edge of the rotor silicon steel sheet 3, the strong magnetic permanent magnet 5 is penetrated in the positioning through-slots, and a central position of the rotor silicon steel sheet 3 is axially penetrated There is an axle groove, in which a connecting shaft 2 is provided, a reduction gear is provided on the outside of the motor body, a rotating bearing is axially provided inside the reduction gear, one end of the connecting shaft 2 passes through the inner wall of the rotating bearing and is fixedly connected to a plurality of fan blades, a control center is provided in the motor body, and the control center is respectively connected to the Hall sensor, the stator winding 6, the reduction gear and the inner rotor assembly one by one, the installation position angle of the Hall sensor is located in front of the installation position angle of the strong magnetic permanent magnet 5, the stator core includes a stator silicon steel sheet and an insulating bracket 4, a plurality of stator silicon steel sheets are evenly compressed and assembled in the insulating bracket 4, the stator winding 6 is an oxygen-free copper wire winding, and the oxygen-free copper wire is tightly wound on the outside of the insulating bracket 4 to form a The stator winding 6 is formed into a coil, the number of the rotor silicon steel sheets 3 is multiple, and the multiple rotor silicon steel sheets 3 are evenly stacked and fixed together, the rotor silicon steel sheets 3 are circular silicon steel sheets, the positioning slots are evenly arranged around the edges of the rotor silicon steel sheets 3, the positioning slots are square through slots, the shape of the strong magnetic permanent magnets 5 is a rectangular parallelepiped, the strong magnetic permanent magnets 5 are fixedly embedded in the positioning slots, the pole pairs of the stator core are in the shape of circular arcs, and a support sheet is radially arranged at the center of the outer side of the pole of the stator core, the stator silicon steel sheet 1 slot is arranged at one end of the inner side of the pole pair of the stator core, the shape of the stator silicon steel sheet 1 slot is in the shape of circular arcs, the stator silicon steel sheet 1 slot and the inner side of the pole pair of the stator core are parallel to each other, and the stator silicon steel sheet 1 slot The length is half of the pole pair length of the stator core, and the inner side surface of the pole pair of the stator core is provided with an inner groove opening outward corresponding to the position of the stator silicon steel sheet 1 slot, and the Hall sensor is fixedly installed in the inner groove. The control center includes a power supply circuit, a control circuit, a drive circuit, and a circuit board composed of a switch and a serial port. The circuit board integrates the power supply circuit, the control circuit and the drive circuit. The power supply circuit supplies power to the control circuit and the drive circuit. The control circuit is composed of a single-chip microcomputer and an internal program. The drive circuit is composed of an H bridge and a drive unit. The control circuit controls the drive circuit to output a fully open signal. The H bridge circuit includes a control switch Q1, a control switch Q2, a control switch Q3, a control switch Q4, an inductor L and a resistor R.The control switches Q1 and Q2 are arranged in parallel. One end of the control switch Q1 is connected to one end of the inductor L, and one end of the control switch Q2 is connected to the other end of the inductor L. The control switches Q3 and Q4 are arranged in parallel. One end of the control switch Q3 is connected to one end of the inductor L, and one end of the control switch Q4 is connected to the other end of the inductor L. The control switches Q3 and Q4 are connected in parallel and then connected to the resistor R, and one end of the resistor R is grounded.

[0020] The present invention proposes a control method for a high-efficiency high-power single-phase motor, which successively includes the following steps: Step 1: Turn on the power supply, start the motor body, and the control center controls the control switches Q1, Q2, Q3, and Q4 to switch regularly, so that the inductor L passes through a square wave with a duty cycle. Step 2: Judge the position of the inner rotor assembly according to the Hall sensor placed with an advance amount, and then transmit the Hall sensor information to the control center. Step 3: The control center pushes the starting duty cycle according to the position information of the inner rotor assembly transmitted by the Hall sensor. Step 4: The control center judges whether the motor is blocked according to the position information of the inner rotor assembly transmitted by the Hall sensor. If it is detected that the motor is blocked, the starting duty cycle is not pushed; otherwise, the starting duty cycle is continuously pushed according to the position of the inner rotor assembly, and then it is judged whether the full-open speed is reached. Step 5: If the control center detects that the full-open speed has not been reached according to the position information of the inner rotor assembly transmitted by the Hall sensor, the duty cycle is continuously pushed; otherwise, it enters the full-open mode, and the entire commutation cycle follows according to the frequency of the Hall sensor signal, where the square wave duty cycle is adjusted according to the power size.

[0021] By using a Hall sensor placed in advance, digging steps on the poles of the stator, and regulating the starting duty cycle on the controller, the present invention enables the single-phase motor to have the ability of positioning torque and smooth starting. The motor is controlled by the method that the entire commutation cycle follows according to the frequency of the Hall signal, and the square wave duty cycle is adjusted according to the power size, which greatly reduces the switching frequency, thereby solving the high-loss problem existing in the prior art and improving the working efficiency and service life of the motor.

[0022] The above embodiments are illustrative of the present invention, not restrictive of the present invention. Any scheme obtained by simply transforming the present invention belongs to the protection scope of the present invention.

Claims

1. A high-efficiency, high-power single-phase motor, characterized in that: The invention comprises a motor body, a stator assembly, an inner rotor assembly and a control center. The motor body is provided with a stator assembly, the stator assembly comprises a stator core, a stator winding (6) and a Hall sensor. The stator winding (6) is wound on the stator core. The stator core is provided with a stator step groove radially at each pole pair position. A plurality of Hall sensors are fixedly provided in the stator step groove. An inner rotor assembly is provided on the inner side of the stator assembly. The inner rotor assembly comprises a rotor silicon steel sheet (3) and a strong magnetic permanent magnet (5). The edge of the rotor silicon steel sheet (3) is provided with a plurality of positioning A through slot, wherein the strong magnetic permanent magnet (5) is arranged through the positioning through slot, an axis through slot is axially arranged through the center position of the rotor silicon steel sheet (3), a connecting shaft (2) is arranged through the through slot, a reduction gear is arranged on the outside of the motor body, a rotating bearing is axially arranged inside the reduction gear, one end of the connecting shaft (2) passes through the inner wall of the rotating bearing and is fixedly connected to a plurality of fan blades, and a control center is arranged in the motor body, and the control center is respectively connected to the Hall sensor, the stator winding (6), the reduction gear and the inner rotor assembly.

2. A high-efficiency, high-power single-phase motor as claimed in claim 1, characterized in that: The installation position angle of the Hall sensor is located in front of the installation position angle of the strong magnetic permanent magnet (5).

3. A high-efficiency, high-power single-phase motor as claimed in claim 1, characterized in that: The stator core comprises a stator silicon steel sheet (1) and an insulating bracket (4), wherein a plurality of stator silicon steel sheets (1) are uniformly compressed and assembled in the insulating bracket (4), and the stator winding (6) is an oxygen-free copper wire winding, wherein the oxygen-free copper wire is tightly wound around the outside of the insulating bracket (4) to form a coil stator winding (6).

4. A high-efficiency, high-power single-phase motor as claimed in claim 1, characterized in that: The number of the rotor silicon steel sheets (3) is multiple, and the multiple rotor silicon steel sheets (3) are evenly stacked and fixed together. The rotor silicon steel sheets (3) are circular silicon steel sheets. The positioning through-slots are evenly arranged around the edges of the rotor silicon steel sheets (3). The positioning through-slots are square through-slots. The strong magnetic permanent magnets (5) are in the shape of rectangular parallelepipeds. The strong magnetic permanent magnets (5) are fixedly embedded in the positioning through-slots.

5. A high-efficiency, high-power single-phase motor as claimed in claim 1, characterized in that: The pole pair of the stator core is in an arc shape, a support plate is radially arranged at the center position of the outer side surface of the pole pair of the stator core, the stator step groove is arranged at one end of the inner side surface of the pole pair of the stator core, the shape of the stator step groove is in an arc shape, the stator step groove and the inner side surface of the pole pair of the stator core are parallel to each other, and the length of the stator step groove is half the length of the pole pair of the stator core.

6. A high-efficiency, high-power single-phase motor as claimed in claim 1, characterized in that: An inner groove opening outward is arranged on the inner side surface of the pole pair of the stator core corresponding to the position of the stator step groove, and the Hall sensor is fixedly installed in the inner groove.

7. A high-efficiency, high-power single-phase motor as claimed in claim 1, characterized in that: The control center includes a power supply circuit, a control circuit, a drive circuit, and a circuit board consisting of a switch and a serial port. The circuit board integrates the power supply circuit, the control circuit and the drive circuit. The power supply circuit supplies power to the control circuit and the drive circuit. The control circuit is composed of a single-chip microcomputer and an internal program. The drive circuit is composed of an H-bridge and a drive unit. The control circuit controls the drive circuit to output a fully-open signal.

8. A high-efficiency, high-power single-phase motor as claimed in claim 7, characterized in that: The H-bridge circuit includes a control switch Q1, a control switch Q2, a control switch Q3, a control switch Q4, an inductor L and a resistor R. The control switch Q1 and the control switch Q2 are arranged in parallel, one end of the control switch Q1 is connected to one end of the inductor L, one end of the control switch Q2 is connected to the other end of the inductor L, the control switch Q3 and the control switch Q4 are arranged in parallel, one end of the control switch Q3 is connected to one end of the inductor L, one end of the control switch Q4 is connected to the other end of the inductor L, the control switch Q3 and the control switch Q4 are connected in parallel to the resistor R, and one end of the resistor R is grounded.

9. A high-efficiency, high-power single-phase motor control method, characterized in that: The following steps are included in sequence: Step 1: Turn on the power supply, start the motor body, and control the control center to regularly switch the control switch Q1, the control switch Q2, the control switch Q3, and the control switch Q4, so that the inductor L passes a square wave with a duty cycle; Step 2: determine the position of the inner rotor assembly according to the Hall sensor placed in advance, and then transmit the Hall sensor information to the control center; Step 3: The control center pushes the start duty cycle according to the position information of the inner rotor assembly transmitted by the Hall sensor; Step 4: The control center determines whether the rotor is blocked according to the position information of the inner rotor assembly transmitted by the Hall sensor. If it is blocked, the duty cycle is stopped; otherwise, the duty cycle is started according to the position of the inner rotor assembly, and then a judgment is made as to whether the full speed is reached. Step 5: The control center detects that the full-open speed has not been reached based on the position information of the inner rotor assembly transmitted by the Hall sensor, and continues to push the duty cycle; otherwise, it enters the full-open mode, and the entire commutation cycle follows the frequency of the Hall sensor signal, where the square wave duty cycle is adjusted according to the power size.

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