Three-phase motor device capable of changing KV value

Abstract

The invention discloses a three-phase motor device capable of changing a KV value, and the device comprises a motor module which comprises three phases of windings, and each phase of winding comprises a first winding, a second winding, a first leading-out point, a second leading-out point, and a third leading-out point; the control module comprises three control circuits and a common wiring point, and each control circuit comprises a first access point, a second access point, a third access point, a circuit access point, a circuit leading-out point, a common connection leading-out point, a first switch, a second switch, a third switch and a fourth switch. The circuit access point is connected with the circuit lead-out point of one of the other two control circuits, the circuit lead-out point is connected with the circuit access point of the other one of the other two control circuits, a fifth switch is arranged on the circuit, the common connection lead-out point is connected with the common wiring point, and a sixth switch is arranged on the circuit. According to the invention, the connection method and the winding number of the three-phase windings can be changed by adjusting the closing of the switches, so that the KV value of the three-phase motor can be changed.

Description

Technical Field

[0001] The present invention relates to the technical field of motor equipment, and in particular to a three-phase motor device capable of changing KV value. Background Art

[0002] A three-phase motor is a motor whose three-phase stator winding (each phase differs by 120 degrees electrical angle) generates a rotating magnetic field when three-phase alternating current is supplied. The rotating magnetic field cuts the rotor winding, thereby generating an induced current in the rotor winding (the rotor winding is a closed path). The KV value of existing three-phase motors is generally set at the factory and is difficult to change, which makes it difficult to change the speed and torque of the three-phase motor, making it difficult to adapt to complex and changing working environments, such as when the robot is powered off. There is room for improvement. Summary of the invention

[0003] The present invention aims to overcome the defects in the above-mentioned prior art and provides a three-phase motor device with changeable KV value. By adjusting the closing state of the switch in the control module, the three-phase winding of the motor module can be switched between star connection and triangle connection, and the number of windings connected to each phase winding is changed at the same time, so that the motor can switch between multiple KV values ​​to adapt to complex and changeable working environments.

[0004] To achieve the above object, the present invention provides a three-phase motor device capable of changing KV value, comprising: A motor module, comprising a three-phase winding, each phase winding comprising a winding line in which a first winding and a second winding are connected in series, a first lead-out point and a second lead-out point respectively arranged at two ends of the winding line, and a third lead-out point arranged between the first winding and the second winding; A control module, comprising three control circuits connected to the three-phase windings in one-to-one correspondence, and a common wiring point, each of the control circuits comprising a first access point, a second access point and a third access point respectively electrically connected to the first to third lead-out points of the corresponding phase winding, a first switch and a second switch serially arranged between the first access point and the third access point, and a third switch and a fourth switch serially arranged between the third access point and the second access point; Each of the control circuits further includes a circuit access point, a circuit lead-out point and a common lead-out point. The circuit access point is arranged on the line between the first switch and the second switch and is used to be connected to the circuit lead-out point in one of the other two control circuits. The circuit lead-out point and the common lead-out point are both arranged on the line between the third switch and the fourth switch. The circuit lead-out point is used to be connected to the circuit access point in the other of the other two control circuits and a fifth switch is arranged on the corresponding connected line. The common lead-out point is connected to the common wiring point and a sixth switch is arranged on the corresponding connected line.

[0005] Further set as follows: the three-phase windings are: A phase winding, including an A phase first winding, an A phase second winding, an A phase first lead-out point, an A phase second lead-out point, and an A phase third lead-out point; A B-phase winding, comprising a B-phase first winding, a B-phase second winding, a B-phase first lead-out point, a B-phase second lead-out point, and a B-phase third lead-out point; The C-phase winding includes a C-phase first winding, a C-phase second winding, a C-phase first lead-out point, a C-phase second lead-out point and a C-phase third lead-out point.

[0006] It is further configured as follows: the three control circuits are respectively an A-phase control circuit, a B-phase control circuit and a C-phase control circuit connected to the A-phase winding, the B-phase winding and the C-phase winding respectively; Wherein, the A-phase control circuit includes an A-phase first access point, an A-phase second access point, an A-phase third access point, an A-phase circuit access point, an A-phase circuit lead-out point, an A-phase common lead-out point, an A-phase first switch, an A-phase second switch, an A-phase third switch, an A-phase fourth switch, an A-phase fifth switch and an A-phase sixth switch; The B-phase control circuit includes a B-phase first access point, a B-phase second access point, a B-phase third access point, a B-phase circuit access point, a B-phase circuit lead-out point, a B-phase common lead-out point, a B-phase first switch, a B-phase second switch, a B-phase third switch, a B-phase fourth switch, a B-phase fifth switch, and a B-phase sixth switch; The C-phase control circuit includes a C-phase first access point, a C-phase second access point, a C-phase third access point, a C-phase circuit access point, a C-phase circuit lead-out point, a C-phase common lead-out point, a C-phase first switch, a C-phase second switch, a C-phase third switch, a C-phase fourth switch, a C-phase fifth switch, and a C-phase sixth switch; The A-phase lead-out point is connected to the B-phase access point, the B-phase lead-out point is connected to the C-phase access point, and the C-phase lead-out point is connected to the A-phase access point.

[0007] It is further configured that: the switch in the control module includes a first wiring terminal and a second wiring terminal for being serially connected to the control circuit, and a first branch and a second branch connected between the first wiring terminal and the second wiring terminal; The first branch includes a first PMOS tube and a first NMOS tube connected in series in sequence, a D pin of the first PMOS tube is connected to an S pin of the first NMOS tube, and the S pin of the first PMOS tube and the D pin of the first NMOS are respectively connected to a first wiring terminal and a second wiring terminal; The second branch includes a second NMOS tube and a second PMOS tube connected in series in sequence, the S pin of the second NMOS tube is connected to the D pin of the second PMOS tube, and the D pin of the second NMOS tube and the S pin of the second PMOS are respectively connected to the first terminal and the second terminal.

[0008] It is further configured that: the first branch further includes a first Schottky diode connected in parallel with the first PMOS tube, and a second Schottky diode connected in parallel with the first NMOS tube; The first Schottky diode only allows current to flow from the second wiring terminal to the first wiring terminal; The second Schottky diode only allows current to flow from the first wiring terminal to the second wiring terminal.

[0009] It is further configured that: the second branch further includes a third Schottky diode connected in parallel with the second NMOS tube, and a fourth Schottky diode connected in parallel with the second PMOS tube; The third Schottky diode only allows current to flow from the second wiring terminal to the first wiring terminal; The fourth Schottky diode only allows current to flow from the first wiring terminal to the second wiring terminal.

[0010] It is further configured that: the switch in the control module is a mechanical switch or a relay.

[0011] Compared with the prior art, the present invention has a simple and reasonable structure. By adjusting the closing state of the switch in the control module, the three-phase winding of the motor module can be switched between star connection and triangle connection, and the number of windings connected to each phase winding is changed at the same time, so that the motor can be conveniently switched between multiple KV values ​​to adapt to complex and changeable working environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of a frame structure of a three-phase motor device capable of changing KV value according to the present invention; Figure 2 It is a schematic diagram of specific electrical connections between a motor module and a control module in a three-phase motor device; Figure 3 It is a circuit diagram of all switches in the control circuit regarding the control part; Figure 4 is a schematic diagram of electrical connection between the three-phase winding and the three control circuits in the first embodiment; Figure 5 is a schematic diagram of electrical connection between the three-phase winding and the three control circuits in the second embodiment; Figure 6 is a schematic diagram of electrical connection between the three-phase winding and the three control circuits in the third embodiment; Figure 7 It is a schematic diagram of electrical connection between the three-phase winding and three control circuits in the fourth embodiment.

[0013] The following reference numerals are marked on the drawings in conjunction with the drawings: 1. Motor module; 11. A-phase winding; A-1, first lead-out point of A-phase; A-2, second lead-out point of A-phase; A-3, third lead-out point of A-phase; MA-1, first winding of A-phase; MA-2, second winding of A-phase; 12. B-phase winding; B-1, B-phase first lead-out point; B-2, B-phase second lead-out point; B-3, B-phase third lead-out point; MB-1, B-phase first winding; MB-2, B-phase second winding; 13. C-phase winding; C-1, first lead-out point of C-phase; C-2, second lead-out point of C-phase; C-3, third lead-out point of C-phase; MC-1, first winding of C-phase; MC-2, second winding of C-phase; 2. Control module; 21. A-phase control circuit; DA-1. A-phase first access point; DA-2. A-phase second access point; DA-3. A-phase third access point; DA-4. A-phase circuit access point; DA-5. A-phase circuit lead-out point; DA-6. A-phase common lead-out point; SWA-1. A-phase first switch; SWA-2. A-phase second switch; SWA-3. A-phase third switch; SWA-4. A-phase fourth switch; SWA-5. A-phase fifth switch; SWA-6. A-phase sixth switch; 22. B-phase control circuit; DB-1, B-phase first access point; DB-2, B-phase second access point; DB-3, B-phase third access point; DB-4, B-phase circuit access point; DB-5, B-phase circuit lead-out point; DB-6, B-phase common lead-out point; SWB-1, B-phase first switch; SWB-2, B-phase second switch; SWB-3, B-phase third switch; SWB-4, B-phase fourth switch; SWB-5, B-phase fifth switch; SWB-6, B-phase sixth switch; 23. C-phase control circuit; DC-1, first access point of C-phase; DC-2, second access point of C-phase; DC-3, third access point of C-phase; DC-4, circuit access point of C-phase; DC-5, circuit lead-out point of C-phase; DC-6, common lead-out point of C-phase; SWC-1, first switch of C-phase; SWC-2, second switch of C-phase; SWC-3, third switch of C-phase; SWC-4, fourth switch of C-phase; SWC-5, fifth switch of C-phase; SWC-6, sixth switch of C-phase; 24. Common wiring point; 25. First wiring terminal; 26. Second wiring terminal; Q1, first PMOS tube; Q2, first NMOS tube; Q3, second NMOS tube; Q4, second PMOS tube; D1, the first Schottky diode D1; D2, the second Schottky diode; D3, the third Schottky diode; D4, the fourth Schottky diode. DETAILED DESCRIPTION

[0014] A specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation.

[0015] The present invention provides a three-phase motor device capable of changing KV value. Figure 1 As shown, it includes a motor module 1 and a control module 2; wherein the motor module 1 includes a three-phase winding and each phase winding includes two windings connected in series, and the control module 2 includes three control circuits connected to the three-phase windings in a one-to-one correspondence. In this embodiment, the three-phase windings of the motor module 1 are respectively an A-phase winding 11 , a B-phase winding 12 and a C-phase winding 13 .

[0016] Specific Figure 1 and Figure 2 The A-phase winding 11 includes a winding circuit in which the A-phase first winding MA-1 and the A-phase second winding MA-2 are connected in series, the A-phase first lead-out point A-1 and the A-phase second lead-out point A-2 are respectively arranged at both ends of the winding circuit, and the A-phase third lead-out point A-3 is arranged between the A-phase first winding MA-1 and the A-phase second winding MA-2.

[0017] The structures of the B-phase winding 12 and the C-phase winding 13 are basically the same as those of the A-phase winding 11, and will not be repeated here. The B-phase winding 12 includes a B-phase first winding MB-1, a B-phase second winding MB-2, a B-phase first lead-out point B-1, a B-phase second lead-out point B-2 and a B-phase third lead-out point B-3, and the C-phase winding 13 includes a C-phase first winding MC-1, a C-phase second winding MC-2, a C-phase first lead-out point C-1, a C-phase second lead-out point C-2 and a C-phase third lead-out point C-3.

[0018] In this embodiment, the three control circuits of the control module 2 are respectively an A-phase control circuit 21 connected to the A-phase winding 11 , a B-phase control circuit 22 connected to the B-phase winding 12 , a C-phase control circuit 23 connected to the C-phase winding 13 , and a common wiring point 24 .

[0019] Specific as Figure 1 and Figure 2As shown, the A-phase control circuit 21 includes an A-phase first access point DA-1, an A-phase second access point DA-2, an A-phase third access point DA-3, an A-phase circuit access point DA-4, an A-phase circuit lead-out point DA-5, an A-phase common lead-out point DA-6, an A-phase first switch SWA-1, an A-phase second switch SWA-2, an A-phase third switch SWA-3, an A-phase fourth switch SWA-4, an A-phase fifth switch SWA-5 and an A-phase sixth switch SWA-6, wherein the A-phase first access point DA-1, the A-phase second access point DA-2 and the A-phase third access point DA-3 are respectively connected to the A-phase first lead-out point A-1, the A-phase second lead-out point A-2 and the A-phase third lead-out point A-3 of the A-phase winding 11, and the A-phase first switch SWA-1 and the A-phase second switch SWA-2 are sequentially connected in series at the A-phase first access point DA-1 and the A-phase third access point D On the line between A-3, the A-phase third switch SWA-3 and the A-phase fourth switch SWA-4 are sequentially connected in series on the line between the A-phase third access point DA-3 and the A-phase second access point DA-2; the A-phase circuit access point DA-4 is set on the line between the A-phase first switch SWA-1 and the A-phase second switch SWA-2, and the A-phase circuit access point DA-4 is used to be connected to the C-phase control circuit 23; the A-phase circuit lead-out point DA-5 and the A-phase common lead-out point DA-6 are both set on the line between the A-phase third switch SWA-3 and the A-phase fourth switch SWA-4, the A-phase circuit lead-out point DA-5 is connected to the B-phase control circuit 22 and the A-phase fifth switch SWA-5 is set on the line between the two, the A-phase common lead-out point DA-6 is connected to the common wiring point 24 and the A-phase sixth switch SWA-6 is set on the line between the two.

[0020] The structure of the B-phase control circuit 22 is basically the same as that of the A-phase control circuit 21, which will not be repeated here. It includes a B-phase first access point DB-1, a B-phase second access point DB-2, a B-phase third access point DB-3, a B-phase circuit access point DB-4, a B-phase circuit lead-out point DB-5, a B-phase common lead-out point DB-6, a B-phase first switch SWB-1, a B-phase second switch SWB-2, a B-phase third switch SWB-3, a B-phase fourth switch SWB-4, a B-phase fifth switch SWB-5 and a B-phase The sixth switch SWB-6; wherein, the B-phase circuit access point DB-4 is set on the line between the B-phase first switch SWB-1 and the B-phase second switch SWB-2 and is connected to the A-phase circuit lead-out point DA-5 of the A-phase control circuit 21, the B-phase circuit lead-out point DB-5 is connected to the C-phase control circuit 23 and the B-phase fifth switch SWB-5 is set on the line between the two, the B-phase common lead-out point DB-6 is connected to the common wiring point 24 and the B-phase sixth switch SWB-6 is set on the line between the two.

[0021] The structure of the C-phase control circuit 23 is basically the same as that of the A-phase control circuit 21, which will not be repeated here. It includes a C-phase first access point DC-1, a C-phase second access point DC-2, a C-phase third access point DC-3, a C-phase circuit access point DC-4, a C-phase circuit lead-out point DC-5, a C-phase common lead-out point DC-6, a C-phase first switch SWC-1, a C-phase second switch SWC-2, a C-phase third switch SWC-3, a C-phase fourth switch SWC-4, a C-phase fifth switch SWC-5, and a C-phase sixth switch SWC-6. C-6; wherein, the C-phase circuit access point DC-4 is set on the line between the C-phase first switch SWC-1 and the C-phase second switch SWC-2 and is connected to the B-phase circuit lead-out point DB-5 of the B-phase control circuit 22, the C-phase circuit lead-out point DC-5 is connected to the A-phase circuit access point DA-4 of the A-phase control circuit 21 and the C-phase fifth switch SWC-5 is set on the line between the two, the C-phase common lead-out point DC-6 is connected to the common wiring point 24 and the C-phase sixth switch SWC-6 is set on the line between the two.

[0022] In this embodiment, if Figure 3 As shown, the control parts of all switches in the control module 2 include a first wiring terminal 25 and a second wiring terminal 26 connected in series on the control circuit, and a first branch and a second branch connected between the first wiring terminal 25 and the second wiring terminal 26; wherein the first branch includes a first PMOS tube Q1 and a first NMOS tube Q2 connected in series in sequence, the D pin of the first PMOS tube Q1 is connected to the S pin of the first NMOS tube Q2, and the S pin of the first PMOS tube Q1 and the D pin of the first NMOS are connected to the first wiring terminal 25 and the second wiring terminal 26 respectively; the second branch includes a first PMOS tube Q1 and a first NMOS tube Q2 connected in series in sequence, the D pin of the first PMOS tube Q1 is connected to the S pin of the first NMOS tube Q2, and the S pin of the first PMOS tube Q1 and the D pin of the first NMOS are connected to the first wiring terminal 25 and the second wiring terminal 26 respectively; The second NMOS tube Q3 and the second PMOS tube Q4 are connected, the S pin of the second NMOS tube Q3 is connected to the D pin of the second PMOS tube Q4, and the D pin of the second NMOS tube Q3 and the S pin of the second PMOS are respectively connected to the first wiring terminal 25 and the second wiring terminal 26; the control part of the switch can adapt to the changes of the load position, the power supply position and the current direction and continue to work through the combination of two groups of NMOS tubes and PMOS tubes connected in series; at the same time, each switch in the control circuit can be automatically controlled to be turned on or off through a program to facilitate the change of the KV value of the three-phase motor.

[0023] In the above scheme, the first branch also includes a first Schottky diode D1 connected in parallel with the first PMOS tube Q1, and a second Schottky diode D2 connected in parallel with the first NMOS tube Q2. The first Schottky diode D1 only allows current to flow from the second terminal 26 to the first terminal 25, and the second Schottky diode D2 only allows current to flow from the first terminal 25 to the second terminal 26. In this way, the first branch can be protected by the first Schottky diode D1 and the second Schottky diode D2 and the response speed of the switch is improved.

[0024] In the above scheme, the second branch also includes a third Schottky diode D3 connected in parallel with the second NMOS tube Q3, and a fourth Schottky diode D4 connected in parallel with the second PMOS tube Q4. The third Schottky diode D3 only allows current to flow from the second terminal 26 to the first terminal 25, and the fourth Schottky diode D4 only allows current to flow from the first terminal 25 to the second terminal 26. In this way, the second branch can be protected by the third Schottky diode D3 and the fourth Schottky diode D4 and the response speed of the switch is improved.

[0025] In some other specific implementation schemes, the switch in the control circuit may also be a mechanical switch or a relay. Example

[0026] like Figure 4 As shown, the first embodiment is a situation in which the A-phase winding 11, the B-phase winding 12 and the C-phase winding 13 are connected in a triangle connection and the A-phase first winding MA-1, the A-phase second winding MA-2, the B-phase first winding MB-1, the B-phase second winding MB-2, the C-phase first winding MC-1 and the C-phase second winding MC-2 are all used; when the A-phase circuit entry point, the B-phase circuit access point DB-4 and the C-phase circuit access point DC-4 are corresponding access points of the three-phase alternating current, the specific closing situation of the switch is: the A-phase first switch SWA-1, the A-phase fourth switch SWA-4 and the A-phase fifth switch SWA-5 are closed in the A-phase control circuit 21; the B-phase first switch SWB-1, the B-phase fourth switch SWB-4 and the B-phase fifth switch SWB-5 are closed in the B-phase control circuit 22; the C-phase first switch SWC-1, the C-phase fourth switch SWC-4 and the C-phase fifth switch SWC-5 are closed in the C-phase control circuit 23.

[0027] Implementation II like Figure 5As shown, the second embodiment is a situation in which the A-phase winding 11, the B-phase winding 12 and the C-phase winding 13 are connected in star connection and the A-phase first winding MA-1, the A-phase second winding MA-2, the B-phase first winding MB-1, the B-phase second winding MB-2, the C-phase first winding MC-1 and the C-phase second winding MC-2 are all used; when the A-phase circuit entry point, the B-phase circuit access point DB-4 and the C-phase circuit access point DC-4 are corresponding access points of the three-phase alternating current, the specific closing situation of the switch is: the A-phase first switch SWA-1, the A-phase fourth switch SWA-4 and the A-phase sixth switch SWA-6 are closed in the A-phase control circuit 21; the B-phase first switch SWB-1, the B-phase fourth switch SWB-4 and the B-phase sixth switch SWB-6 are closed in the B-phase control circuit 22; the C-phase first switch SWC-1, the C-phase fourth switch SWC-4 and the C-phase sixth switch SWC-6 are closed in the C-phase control circuit 23.

[0028] Implementation Three like Figure 6 As shown, embodiment three is a situation where the A-phase winding 11, the B-phase winding 12 and the C-phase winding 13 are connected in a triangle connection and the A-phase first winding MA-1, the B-phase first winding MB-1 and the C-phase first winding MC-1 are used; when the A-phase circuit entry point, the B-phase circuit access point DB-4 and the C-phase circuit access point DC-4 are corresponding access points of the three-phase alternating current, the specific closing situation of the switch is: the A-phase first switch SWA-1, the A-phase third switch SWA-3 and the A-phase fifth switch SWA-5 are closed in the A-phase control circuit 21; the B-phase first switch SWB-1, the B-phase third switch SWB-3 and the B-phase fifth switch SWB-5 are closed in the B-phase control circuit 22; the C-phase first switch SWC-1, the C-phase third switch SWC-3 and the C-phase fifth switch SWC-5 are closed in the C-phase control circuit 23.

[0029] Implementation Four like Figure 7 As shown, the fourth embodiment is a situation where the A-phase winding 11, the B-phase winding 12 and the C-phase winding 13 are connected in a star connection and the A-phase second winding MA-2, the B-phase second winding MB-2 and the C-phase second winding MC-2 are all used; when the A-phase circuit entry point, the B-phase circuit access point DB-4 and the C-phase circuit access point DC-4 are the corresponding access points of the three-phase alternating current, the specific closing situation of the switch is: the A-phase second switch SWA-2, the A-phase fourth switch SWA-4 and the A-phase sixth switch SWA-6 are closed in the A-phase control circuit 21; the B-phase second switch SWB-2, the B-phase fourth switch SWB-4 and the B-phase sixth switch SWB-6 are closed in the B-phase control circuit 22; the C-phase second switch SWC-2, the C-phase fourth switch SWC-4 and the C-phase sixth switch SWC-6 are closed in the C-phase control circuit 23.

[0030] Compared with the prior art, the present invention has a simple and reasonable structure. By adjusting the closing state of the switch in the control module, the three-phase winding of the motor module can be switched between star connection and triangle connection, and the number of windings connected to each phase winding is changed at the same time, so that the motor can be conveniently switched between multiple KV values ​​to adapt to complex and changeable working environments.

[0031] The above disclosure is only an embodiment of the present invention, but the present invention is not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A three-phase motor device with variable KV value, characterized in that: include: A motor module, comprising a three-phase winding, each phase winding comprising a winding line in which a first winding and a second winding are connected in series, a first lead-out point and a second lead-out point respectively arranged at two ends of the winding line, and a third lead-out point arranged between the first winding and the second winding; A control module, comprising three control circuits connected to the three-phase windings in one-to-one correspondence, and a common wiring point, each of the control circuits comprising a first access point, a second access point and a third access point respectively electrically connected to the first to third lead-out points of the corresponding phase winding, a first switch and a second switch serially arranged between the first access point and the third access point, and a third switch and a fourth switch serially arranged between the third access point and the second access point; Each of the control circuits further includes a circuit access point, a circuit lead-out point and a common lead-out point. The circuit access point is arranged on the line between the first switch and the second switch and is used to be connected to the circuit lead-out point in one of the other two control circuits. The circuit lead-out point and the common lead-out point are both arranged on the line between the third switch and the fourth switch. The circuit lead-out point is used to be connected to the circuit access point in the other of the other two control circuits and a fifth switch is arranged on the corresponding connected line. The common lead-out point is connected to the common wiring point and a sixth switch is arranged on the corresponding connected line.

2. A three-phase motor device with variable KV value according to claim 1, characterized in that: The three-phase windings are: A phase winding, including an A phase first winding, an A phase second winding, an A phase first lead-out point, an A phase second lead-out point, and an A phase third lead-out point; A B-phase winding, comprising a B-phase first winding, a B-phase second winding, a B-phase first lead-out point, a B-phase second lead-out point, and a B-phase third lead-out point; The C-phase winding includes a C-phase first winding, a C-phase second winding, a C-phase first lead-out point, a C-phase second lead-out point and a C-phase third lead-out point.

3. A three-phase motor device with variable KV value according to claim 2, characterized in that: The three control circuits are respectively an A-phase control circuit, a B-phase control circuit and a C-phase control circuit which are connected to the A-phase winding, the B-phase winding and the C-phase winding respectively; Wherein, the A-phase control circuit includes an A-phase first access point, an A-phase second access point, an A-phase third access point, an A-phase circuit access point, an A-phase circuit lead-out point, an A-phase common lead-out point, an A-phase first switch, an A-phase second switch, an A-phase third switch, an A-phase fourth switch, an A-phase fifth switch and an A-phase sixth switch; The B-phase control circuit includes a B-phase first access point, a B-phase second access point, a B-phase third access point, a B-phase circuit access point, a B-phase circuit lead-out point, a B-phase common lead-out point, a B-phase first switch, a B-phase second switch, a B-phase third switch, a B-phase fourth switch, a B-phase fifth switch, and a B-phase sixth switch; The C-phase control circuit includes a C-phase first access point, a C-phase second access point, a C-phase third access point, a C-phase circuit access point, a C-phase circuit lead-out point, a C-phase common lead-out point, a C-phase first switch, a C-phase second switch, a C-phase third switch, a C-phase fourth switch, a C-phase fifth switch, and a C-phase sixth switch; The A-phase lead-out point is connected to the B-phase access point, the B-phase lead-out point is connected to the C-phase access point, and the C-phase lead-out point is connected to the A-phase access point.

4. A three-phase motor device with variable KV value according to claim 1, characterized in that: The switch in the control module includes a first wiring terminal and a second wiring terminal for being serially connected to the control circuit, and a first branch and a second branch connected between the first wiring terminal and the second wiring terminal; The first branch includes a first PMOS tube and a first NMOS tube connected in series in sequence, a D pin of the first PMOS tube is connected to an S pin of the first NMOS tube, and the S pin of the first PMOS tube and the D pin of the first NMOS are respectively connected to a first wiring terminal and a second wiring terminal; The second branch includes a second NMOS tube and a second PMOS tube connected in series in sequence, the S pin of the second NMOS tube is connected to the D pin of the second PMOS tube, and the D pin of the second NMOS tube and the S pin of the second PMOS are respectively connected to the first terminal and the second terminal.

5. A three-phase motor device with variable KV value according to claim 4, characterized in that: The first branch also includes a first Schottky diode connected in parallel with the first PMOS tube, and a second Schottky diode connected in parallel with the first NMOS tube; The first Schottky diode only allows current to flow from the second wiring terminal to the first wiring terminal; The second Schottky diode only allows current to flow from the first wiring terminal to the second wiring terminal.

6. A three-phase motor device with variable KV value according to claim 4, characterized in that: The second branch also includes a third Schottky diode connected in parallel with the second NMOS tube, and a fourth Schottky diode connected in parallel with the second PMOS tube; The third Schottky diode only allows current to flow from the second wiring terminal to the first wiring terminal; The fourth Schottky diode only allows current to flow from the first wiring terminal to the second wiring terminal.

7. A three-phase motor device with variable KV value according to claim 1, characterized in that: The switch in the control module is a mechanical switch or a relay.

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