CN216649354U

CN216649354U - Novel motor adopting double stators and high output power

Info

Publication number: CN216649354U
Application number: CN202122562570.8U
Authority: CN
Inventors: 孙洪利
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-10-25
Filing date: 2021-10-25
Publication date: 2022-05-31
Anticipated expiration: 2031-10-25

Abstract

The utility model belongs to the field of motors, and particularly discloses a novel motor adopting double stators and high output power, which comprises the following specific steps: s1: a, B two-phase lapping wires are respectively wound on the two groups of stator iron cores in a matched mode through an electronic switch H bridge of the circuit, and a connecting method is carried out at the midpoint position of the two-phase lapping wires; s2: detecting the rotation angle positions of the S pole and the N pole of the rotor magnetic steel through a sensor; s3: the electronic switch controller receives the signals of the position sensor, and controls the direction and the time of the electrifying current of each group of windings, so that two groups of stators generate a method for simultaneously and alternately outputting power; s4: and then matching with the S pole and the N pole of the rotor magnetic steel output on the surface of the rotor to output power according to the principle that like poles repel and unlike poles attract, so that the motor rotor rotates. More efficient in output power performance.

Description

Novel motor adopting double stators and high output power

Technical Field

The utility model relates to the technical field of motors, in particular to a novel motor with double stators and high output power. The motor is suitable for an inner rotor motor, an outer rotor motor, a disc type motor and the like of a permanent magnet motor series.

Background

With the continuous innovative development of motor drive and motor principle. The permanent magnet motor is generally served to the market of intelligent equipment, and has gained better public praise in various fields due to better performance. In order to serve the market better, the principle of higher performance motor output power is always the development direction pursued by the market.

Disclosure of Invention

Aiming at the prior motor technology, the utility model provides a novel motor with double stators and high output power. An electronic switch H bridge on a controller control circuit is mainly used, A, B two groups of winding wires are respectively wound on two groups of stator iron cores in a matched mode, and the two groups of stator iron cores generate a method for simultaneously and alternately performing power output. The principle is that a motor stator is integrally divided into two groups, one group of stator cores are A-phase windings, the other group of stator cores are B-phase windings, the middle points of the A-phase winding lengths and the middle points of the B-phase winding lengths are connected, independent electronic switches are added at two ends of each group of windings, S-pole and N-pole rotation angle position signals of rotor magnetic steel detected by a Hall sensor are received by an electronic switch controller, the electronic switches are controlled to be switched on and switched off, the electrifying current direction and the electrifying time of each group of windings are independently controlled respectively, and output power conversion and electrifying time control of each group of output S-pole and N-pole winding wire stator cores are achieved. Then matching with the S pole and N pole of the rotor corresponding to the magnetic steel (strong magnetism, magnetic shoe). And making a principle that homopolar repulsion and heteropolar attraction are carried out, and making power output so as to enable the motor rotor to rotate. More excellent in output power.

The technical scheme of the utility model is as follows: the utility model provides a novel motor adopting double stators and high output power, which comprises an integral stator and rotor magnetic steel, wherein the integral stator and the rotor magnetic steel are composed of a first group of stator cores and a second group of stator cores;

the device also comprises a motor controller and 2 Hall sensors;

the motor controller comprises a power supply, an electronic switch controller and two groups of electronic switch H bridges, wherein the two groups of electronic switch H bridges are respectively a first group of electronic switch H bridges and a second group of electronic switch H bridges;

each group of electronic switch H bridge comprises four electronic switches which are respectively a first electronic switch and a second electronic switch; after the first electronic switch and the second electronic switch are connected in series, one end of the first electronic switch is connected with the positive electrode of the power supply, and the other end of the first electronic switch is connected with the negative electrode of the power supply; after the third electronic switch and the fourth electronic switch are connected in series, one end of the third electronic switch is connected with the positive electrode of the power supply, and the other end of the third electronic switch is connected with the negative electrode of the power supply; the middle connection node of the first electronic switch and the second electronic switch is a first connection node, and the middle connection node of the third electronic switch and the fourth electronic switch is a second connection node;

Preferably, each group of electronic switch H bridge further comprises a capacitor, and two ends of the capacitor are respectively connected with the anode and the cathode of the power supply. Realizing bypass, decoupling, filtering and energy storage.

The head end and the tail end of the A-phase winding are respectively connected with a first connecting node and a second connecting node of a first group of electronic switch H bridges;

the head end and the tail end of the B-phase winding are respectively connected with a first connecting node and a second connecting node of a second group of electronic switch H bridges; the electronic switch controller controls the on-off of the electronic switches of the H bridge of each group of electronic switches according to the received signals of the two Hall sensors, and then controls the on-off of the current direction of each resistance winding of the motor.

Further, the two groups of stator cores are the same stator; and a stator center line of the first group of stator cores and a superposed position of stator slot center lines between two adjacent stators of the second group of stator cores are fixed to form an integral stator.

Furthermore, the A-phase lapped wires and the B-phase lapped wires are the same lapped wires, and the length resistance values of the two groups of lapped wires are consistent.

Furthermore, the A-phase winding wires are wound on the first group of stator cores, the B-phase winding wires are wound on the second group of stator cores, and the adjacent two stators on the stator cores after each group of winding wires are respectively used for S-pole and N-pole power output through different winding methods.

Furthermore, the middle point position of the length of the A-phase wrapping wire is connected with the middle point position of the length of the B-phase wrapping wire.

Furthermore, the number of the rotor magnetic steels is 12.

Further, the number of the stator core slots in each group is 12.

Furthermore, the two Hall sensors are arranged, the first Hall sensor is arranged at a position coinciding with the center line of the stator slot between two adjacent stators of the first group of stator cores, and can effectively detect the rotating angle positions of the S pole and the N pole of the rotor; the second Hall sensor is arranged at a position coinciding with the center line of the stator slot between two adjacent stators of the second group of stator cores and can effectively detect the rotating angle positions of the S pole and the N pole of the rotor;

the utility model has the beneficial effects that: compared with the traditional permanent magnet motor, the permanent magnet motor adopts a rotating magnetic field power output mode. The motor has the advantages that A, B two groups of winding wires are respectively wound on two groups of stator iron cores, the adjacent two stators on the stator iron cores do S pole and N pole power output respectively after each group of winding wires are wound by different winding methods, the connection line connection is carried out at the midpoint position of the two groups of winding wires (the eddy current heating problem is reduced), the rotation angle positions of the S pole and the N pole of the rotor magnetic steel are detected by the sensor, the opening and closing of the electronic switch are controlled by the position signal of the Hall sensor received by the electronic switch controller, the electrifying current direction and the electrifying time of each group of winding wires are respectively and independently controlled, the S pole and the N pole on the stator iron core of each output group of winding wires are subjected to output power conversion and electrifying time control, and the two groups of stator iron cores generate a method for simultaneously and alternately doing power output. And then the S pole and the N pole which are output on the surface of the rotor by matching with the rotor magnetic steel. And performing power output on the principle that like poles repel and unlike poles attract, so that the motor rotor rotates. More efficient in output power.

In the prior art of permanent magnet motors. The motor adopts the configuration scheme that the quantity of the stator core slots is the same as that of the rotor magnetic steels (or the total quantity of S poles and N poles output by the magnetic steels to the surface of the rotor), so that the S poles and N poles output by all adjacent stators on each group of winding stator iron cores and the rotor magnetic steels (or the S poles and N poles output by the magnetic steels to the surface of the rotor) do power output simultaneously. The time proportion of the two groups of stator cores for outputting power simultaneously and alternately is controlled and adjusted by matching with an electronic switch controller, so that the performances such as output torque and the like become more excellent.

According to the motor principle, the opening and closing of each electronic switch are controlled through software such as programming and the like through an electronic switch controller of a motor controller, so that the motor can be accelerated and decelerated, rotated forwards and reversely and the like during operation.

Drawings

FIG. 1 is a first position view of a rotor in accordance with an embodiment;

FIG. 2 is a view illustrating the rotation of the rotor to a second position in the embodiment;

FIG. 3 is a view illustrating the rotation of the rotor to a third position in the embodiment;

FIG. 4 is a diagram illustrating the rotation of the rotor to a fourth position in the embodiment;

FIG. 5 is a view illustrating the rotation of the rotor to a fifth position in the embodiment;

FIG. 6 is a view illustrating the rotation of the rotor to a sixth position in the embodiment;

FIG. 7 is a view showing the rotation of the rotor to a seventh position in the embodiment;

FIG. 8 is a view showing the rotation of the rotor to the eighth position in the embodiment;

FIG. 9 is a schematic view of the installation angles of two sets of stator cores and Hall sensors of an outer rotor motor;

FIG. 10 is a schematic view of two stator core installation angles and Hall sensors of an inner rotor motor;

wherein: the motor comprises a motor shell 1, a first Hall sensor 2, a second Hall sensor 21, a rotor magnetic steel 3, a first stator core group 4, a second stator core group 41, an A-phase winding wire 5, a B-phase winding wire 51, two phase line connecting wires 6, an EQ (equal average), a DC + anode, a DC-cathode, a VCC (direct current low voltage signal + (high and low level voltage is required by electronic components), and a GND (ground potential) for signal public.

Detailed Description

The utility model is further described below with reference to the accompanying drawings.

The embodiment provides a novel motor with double stators and high output power, and is suitable for an inner rotor motor, an outer rotor motor, a disc motor and the like. A, B two groups of winding wires are respectively wound on the two groups of stator iron cores in a matching way through an electronic switch H bridge of a motor controller, and the two groups of winding wires are connected at the middle point positions of the two groups of winding wires, so that the two groups of winding stator iron cores simultaneously and alternately perform a power output method. Winding A-phase winding wires on a first group of stator cores, winding B-phase winding wires on a second group of stator cores, and respectively outputting S-pole and N-pole power of two adjacent stators on each group of wound stator cores by different winding methods; and connecting the middle point of the A phase winding length and the middle point of the B phase winding length. The motor A is around the line with B is around the line mutually, and every group is around the line both ends and all has independent electronic switch, detects rotor magnet steel 'S the S utmost point and the N utmost point rotation angle position signal through hall sensor, and rethread electronic switch controller control electronic switch' S switching, and the circular telegram current direction and the circular telegram time control of each group of winding of independent control respectively make the S utmost point and the N utmost point on every group of output around the line stator core take place output power conversion and circular telegram time control. Then matching with the S pole and N pole of the rotor corresponding to the magnetic steel (strong magnetism, magnetic shoe). And the principle of homopolar repulsion and heteropolar attraction is used for power output, so that the motor rotor rotates.

Motor requirements (structural features):

as shown in FIG. 1, the two windings are divided into two groups A1-A2 and B1-B2. The first set of lapped wires 5 and the second set of lapped wires 51 are required to be the same lapped wires, and the resistance values of the lengths are consistent. And the connecting wire 6 is connected at the midpoint position of the two groups of lapping wires (the problem of eddy current heating is reduced). And each group of upper stator cores respectively output S poles and N poles for two adjacent stators by different winding methods.

As shown in fig. 9 and 10, the center lines of the first and second stator cores are overlapped to fix the two stator cores into an integral stator.

As shown in fig. 9 and 10, the first group of stator cores 4 and the second group of stator cores 41 are the same stator, and the number of stator core slots is selected to be even (2, 4, 6, 8, 10 …) according to the size, torque and speed requirements of the motor.

As shown in fig. 9 and 10, the total number of S poles and N poles output from the rotor magnetic steel 3 (strong magnetic, magnetic shoe) to the rotor surface is equal to the number of stator core slots.

As shown in fig. 9 and 10, the number of stator core slots is 12, and the total number of S poles and N poles output to the rotor surface by the rotor magnetic steel (strong magnet, magnetic shoe) is 12.

In this embodiment, as shown in fig. 1, the number of stator core slots is 12, and the total number of S poles and N poles output to the rotor surface by rotor magnetic steel (strong magnet and magnetic shoe) is 12. The motor also comprises a motor controller, wherein an integrated circuit in the motor controller mainly comprises an electronic switch controller, a power supply and two groups of electronic switch H bridges, and the two groups of electronic switch H bridges are respectively a first group of electronic switch H bridges and a second group of electronic switch H bridges;

each group of electronic switch H bridge comprises four electronic switches which are respectively a first electronic switch, a second electronic switch, a third electronic switch and a fourth electronic switch; after the first electronic switch and the second electronic switch are connected in series, one end of the first electronic switch is connected with the positive electrode of a power supply, and the other end of the first electronic switch is connected with the negative electrode of the power supply; after the third electronic switch and the fourth electronic switch are connected in series, one end of the third electronic switch is connected with the positive electrode of the power supply, and the other end of the third electronic switch is connected with the negative electrode of the power supply; the middle connection node of the first electronic switch and the second electronic switch is a first connection node, and the middle connection node of the third electronic switch and the fourth electronic switch is a second connection node.

The head end of the A-phase winding is connected with a first connecting node of a first group of electronic switch H bridges, and the tail end of the A-phase winding is connected with a second connecting node of the first group of electronic switch H bridges; the first group of electronic switch H bridge comprises electronic switches K1, K2, K3 and K4.

The head end of the phase B winding is connected with a first connecting node of a second group of electronic switch H bridge, and the tail end of the phase B winding is connected with a second connecting node of the second group of electronic switch H bridge. The second group of electronic switch H bridge comprises electronic switches K5, K6, K7 and K8.

The motor controller also comprises 2 Hall sensors for detecting the S pole and N pole positions of the rotor magnetic steel and an electronic switch controller for controlling the electronic switch according to the position signals of the Hall sensors.

Positional relationship between the hall sensor and the stator core:

as shown in fig. 9 or fig. 10, the first hall sensor 2 (in the present embodiment, a hall sensor is used) is installed at a position coinciding with a center line of a stator core slot between two adjacent stators of the first group of stator cores 4, and can effectively detect rotational angle positions of S pole and N pole of the rotor; the second hall sensor 21 is installed at a position coinciding with the center line of the stator slot between two adjacent stators of the second group of stator cores 41, and can effectively detect the rotational angle positions of the S pole and the N pole of the rotor.

The detailed scheme is as follows:

as shown in fig. 1, the S pole of the rotor magnetic steel is at the position of the first hall sensor 2, and the VCC signal is generated at the position of the first hall sensor 2, and the electronic switches of the (K1, K4) group are closed, and the electronic switches of the (K2, K3) group are opened. The a1, a2 windings of the stator core 4 produce S and N pole outputs as shown in fig. 1 (view one). Meanwhile, the S pole of the rotor magnetic steel is positioned at the position of the second Hall sensor 21, the second Hall sensor 21 generates a VCC signal, the (K5, K8) group electronic switches are closed, and the (K6, K7) group electronic switches are opened. The B1 and B2 windings of the stator core 41 produce S-pole and N-pole outputs as shown in fig. 1 (view two). The rotor integrally rotates counterclockwise.

As shown in fig. 2, when the rotor rotates between fig. 1 and fig. 3, the S pole of the rotor magnetic steel is located at the position of the first hall sensor 2, the VCC signal is generated at the position of the first hall sensor 2, and meanwhile, the S pole of the rotor magnetic steel is located at the position of the second hall sensor 21, and the VCC signal is generated by the second hall sensor 21 (unchanged from the hall signal shown in fig. 1). The electronic switches of group (K1, K4) are closed and the electronic switches of group (K2, K3) are open. The a1, a2 windings of the stator core 4 produce S and N pole outputs as shown in fig. 2 (view one). The electronic switch controller turns off the electronic switch time value by time delay (the principle is that the electronic controller receives the position of the first hall sensor 2 to generate a VCC signal, the second hall sensor 21 generates a VCC signal, and the time delay turning-off time value is set by software editing according to power requirements of rotating speed, torque and the like required to be output by the motor), turns off the electronic switch (K5, K6, K7, K8), and turns off the stator iron core 41 by B1 and B2 to realize no power output as shown in fig. 2 (view two). The rotor integrally rotates counterclockwise.

As shown in fig. 3, the S pole of the rotor magnetic steel is at the position of the first hall sensor 2, and the VCC signal is generated at the position of the first hall sensor 2, and the electronic switches of the (K1, K4) group are closed, and the electronic switches of the (K2, K3) group are opened. The a1, a2 windings of the stator core 4 produce S and N pole outputs as shown in fig. 3 (view one). Meanwhile, the N pole of the rotor magnetic steel is positioned at the position of the second Hall sensor 21, the second Hall sensor 21 generates a GND signal, the electronic switches of the (K6, K7) groups are closed, and the electronic switches of the (K5, K8) groups are opened. The B1 and B2 windings of the stator core 41 produce N-pole and S-pole outputs as shown in fig. 3 (view two). The rotor integrally rotates counterclockwise.

As shown in fig. 4, when the rotor rotates between fig. 3 and fig. 5, the S pole of the rotor magnetic steel is located at the position of the first hall sensor 2, the VCC signal is generated at the position of the first hall sensor 2, and simultaneously, the N pole of the rotor magnetic steel is located at the position of the second hall sensor 21, and the GND signal is generated by the second hall sensor 21 (unchanged from the hall signal shown in fig. 3). The electronic switch controller turns off the electronic switch time value by time delay (the principle is that the electronic controller receives the position of the first hall sensor 2 to generate a VCC signal, the second hall sensor 21 generates a GND signal, and the time delay turning-off time value is set by software editing according to power requirements of rotating speed, torque and the like required to be output by the motor), the electronic switch (K1, K2, K3 and K4) is turned off, and the A1 and A2 winding stator iron core 4 has no power output as shown in figure 4 (view I). The electronic switches of group (K6, K7) are closed and the electronic switches of group (K5, K8) are open. The B1 and B2 windings of the stator core 41 produce N-pole and S-pole outputs as shown in fig. 4 (view two). The rotor integrally rotates counterclockwise.

As shown in fig. 5, the N pole of the rotor magnetic steel is at the position of the first hall sensor 2, and the GND signal is generated at the position of the first hall sensor 2, the electronic switches in the (K2, K3) groups are closed, and the electronic switches in the (K1, K4) groups are opened. A1, a2 make N-pole and S-pole outputs around the stator core 4 as shown in fig. 5 (view a). Meanwhile, the N pole of the rotor magnetic steel is positioned at the position of the second Hall sensor 21, the second Hall sensor 21 generates a GND signal, the electronic switches of the (K6, K7) groups are closed, and the electronic switches of the (K5, K8) groups are opened. B1 and B2 provide N-pole and S-pole outputs as shown in fig. 5 (view two) around the stator core 41. The rotor integrally rotates counterclockwise.

As shown in fig. 6, when the rotor rotates between fig. 5 and fig. 7, the N pole of the rotor magnetic steel is at the position of the first hall sensor 2, and the GND signal is generated at the position of the first hall sensor 2, and simultaneously the N pole of the rotor magnetic steel is at the position of the second hall sensor 21, and the GND signal is generated by the second hall sensor 21 (unchanged from the hall signal shown in fig. 5). The electronic switches of group (K2, K3) are closed and the electronic switches of group (K1, K4) are open. The a1, a2 windings of the stator core 4 produce N and S pole outputs as shown in fig. 6 (view one). The electronic switch controller turns off the electronic switch time value through time delay (the principle is that the electronic controller receives the position of the first Hall sensor 2 to generate a GND signal, the second Hall sensor 21 generates a GND signal, and the time delay turning-off time value is set through software editing according to power requirements of the rotating speed, torque and the like required to be output by the motor), and turns off the electronic switches (K5, K6, K7 and K8) of the group. B1 and B2 have no power output around the stator core 41 as shown in fig. 6 (view two). The rotor integrally rotates counterclockwise.

As shown in fig. 7, the N pole of the rotor magnetic steel is at the position of the first hall sensor 2, and the position of the first hall sensor 2 generates a GND signal, and the electronic switches of the (K2, K3) group are closed, and the electronic switches of the (K1, K4) group are opened. A1, a2 make N-pole and S-pole outputs around the stator core 4 as shown in fig. 7 (view a). Meanwhile, the S pole of the rotor magnetic steel is positioned at the position of the second Hall sensor 21, the second Hall sensor 21 generates a VCC signal, the (K5, K8) group electronic switches are closed, and the (K6, K7) group electronic switches are opened. The B1 and B2 windings of the stator core 41 produce S-pole and N-pole outputs as shown in fig. 7 (view two). The rotor integrally rotates counterclockwise.

As shown in fig. 8, when the rotor rotates between fig. 7 and fig. 1, the N pole of the rotor magnetic steel is located at the position of the first hall sensor 2, the GND signal is generated at the position of the first hall sensor 2, and simultaneously the S pole of the rotor magnetic steel is located at the position of the second hall sensor 21, the VCC signal is generated by the second hall sensor 21 (unchanged from the hall signal shown in fig. 7). The electronic switch controller closes the electronic switch time value through time delay (the principle is that the electronic controller receives the position of the first Hall sensor 2 to generate a GND signal, the second Hall sensor 21 generates a VCC signal, and the time delay closing time value is set through software editing according to the power requirements of the rotating speed, the torque and the like required to be output by the motor), and the electronic switches (K1, K2, K3 and K4) are disconnected. The a1, a2 windings of the stator core 4 have no power output as shown in fig. 8 (view one). The electronic switches of group (K5, K8) are closed and the electronic switches of group (K6, K7) are open. The B1 and B2 windings of the stator core 41 produce S-pole and N-pole outputs as shown in fig. 8 (view two). The rotor integrally rotates counterclockwise.

The rotor is rotated counterclockwise to the fig. 1 position and the fig. 1-8 action is repeated.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention.

Claims

1. A novel motor adopting double stators and high output power is characterized by comprising rotor magnetic steel (3), a first group of stator cores (4) and a second group of stator cores (41), wherein the rotor magnetic steel (3), the first group of stator cores and the second group of stator cores are arranged in a motor shell (1); a-phase lapped wires (5) are wound on the first group of stator cores (4), and B-phase lapped wires (51) are wound on the second group of stator cores (41); the middle point position of the length of the A-phase lapping cable is connected with the middle point position of the length of the B-phase lapping cable through a connecting wire (6); the motor controller, the integrated circuit arranged in the motor controller and the Hall sensor for detecting the rotation position angles of the S pole and the N pole of the rotor magnetic steel (3) are further included;

Each group of electronic switch H bridge comprises four electronic switches which are respectively a first electronic switch, a second electronic switch, a third electronic switch and a fourth electronic switch; after the first electronic switch and the second electronic switch are connected in series, one end of the first electronic switch is connected with the positive electrode of a power supply, and the other end of the first electronic switch is connected with the negative electrode of the power supply; after the third electronic switch and the fourth electronic switch are connected in series, one end of the third electronic switch is connected with the positive electrode of the power supply, and the other end of the third electronic switch is connected with the negative electrode of the power supply; the middle connection node of the first electronic switch and the second electronic switch is a first connection node, and the middle connection node of the third electronic switch and the fourth electronic switch is a second connection node;

the head end and the tail end of the B-phase winding are respectively connected with a first connecting node and a second connecting node of a second group of electronic switch H bridges;

the electronic switch controller controls the on-off of the electronic switches of the H bridge of each group of electronic switches according to the received signals of the two Hall sensors, and then controls the on-off of the current direction of each resistance winding of the motor.

2. The novel motor with double stators and high output power of claim 1, wherein: the stator comprises a first group of stator cores (4) and a second group of stator cores (41), wherein the first group of stator cores (4) and the second group of stator cores (41) are the same stator, and the center line of one stator core of the first group of stator cores (4) and the center line of the stator slot of two adjacent stator cores of the second group of stator cores (41) are overlapped and fixed to form an integral stator.

3. A novel motor with double stators and high output power, which is disclosed in claim 1, wherein: a phase winding wire (5) is wound on the first group of stator cores (4), B phase winding wire (51) is wound on the second group of stator cores (41), and the adjacent two stators on the stators after each group of winding wires are respectively used for S pole power output and N pole power output through different winding methods.

4. The novel motor with double stators and high output power of claim 1 or 3, wherein: the A-phase winding wire and the B-phase winding wire are the same winding wire, and the resistance values of the lengths of the two groups of winding wires are the same.

5. The novel motor with double stators and high output power of claim 1, wherein: the number of the slots of the stator cores (4) and (41) is consistent with the total number of S poles and N poles which are output by the rotor magnetic steel (3) and evenly distributed on the surface of the rotor.

6. The novel motor with double stators and high output power of claim 1 or 2, wherein: the number of the stator core (4) (41) slots is 12, and the number of the rotor magnetic steels is 12.

7. The novel motor with double stators and high output power of claim 1, wherein: the Hall sensors comprise two Hall sensors, the first Hall sensor (2) is arranged between the first group of stator cores and two adjacent stator cores of the first group of stator cores (4), the center lines of the stator slots coincide with each other, and the rotating angle positions of the N pole and the S pole of the rotor magnetic steel (3) can be effectively detected; the second Hall sensor (21) is arranged between the stator slots of the two adjacent stators of the second group of stator cores (41) and is superposed with the center line of the stator slots, and the rotating angle positions of the N pole and the S pole of the rotor magnetic steel (3) can be effectively detected.