TWI662784B - Steering control system for three-phase motor - Google Patents

Abstract

The invention relates to a steering control system for a three-phase motor. The steering control system includes: a set of three-phase motor coils, a set of three-phase induction circuits, a control circuit, and a control switch group. The three-phase induction circuit is used to sense the position of a rotor. The control circuit is used to provide a three-phase coil signal and receive a three-phase induction signal. The three-phase coil signal is used to provide a signal to the three-phase motor coil. The three-phase induction signal is from the three-phase induction circuit. The control switch group is used to switch and control the three-phase coil signal to the three-phase motor coil and the three-phase induction signal from the three-phase induction circuit at the same time to control the steering of the three-phase motor. Therefore, by using the control switch group to switch and control the three-phase coil signal and the three-phase induction signal at the same time to correctly sense the position of the rotor, the control circuit does not need to perform any circuit change design or program modification, which can save design Cost and component cost, and reduce the complexity of component maintenance.

Description

Steering control system for three-phase motor

The invention relates to a steering control system for a three-phase motor.

It is known that the steering control system of a three-phase motor must switch to control the power phase of the three-phase motor, and the related control circuits or programs must be changed to detect the steering of the motor and the position of the rotor accordingly, causing the control circuit or program to be equivalent Complexity also increases considerable design costs and component costs.

The invention relates to a steering control system for a three-phase motor. The steering control system for a three-phase motor includes: a set of three-phase motor coils, a set of three-phase induction circuits, a control circuit, and a control switch group. The three-phase motor coil includes a first coil, a second coil, and a third coil. The three-phase induction circuit includes a first induction circuit, a second induction circuit, and a third induction circuit. The three-phase induction circuit is used to sense the position of a rotor. The control circuit is used to provide a three-phase coil signal and receive a three-phase induction signal. The three-phase coil signal is used to provide a signal to the three-phase motor coil. The three-phase induction signal is from the three-phase induction circuit. The control switch group is used to switch and control the three-phase coil signal to the three-phase motor coil and the three-phase induction signal from the three-phase induction circuit at the same time to control the steering of the three-phase motor.

Therefore, by using the control switch group to switch and control the three-phase coil signal and the three-phase induction signal at the same time to correctly sense the position of the rotor, the control circuit does not need to perform any circuit change design or program modification in order to greatly Save design costs and component costs, and reduce the complexity of component maintenance.

FIG. 1 shows a block diagram of a steering control system for a three-phase motor according to the present invention. In an embodiment, the steering control system of the present invention can be used for steering control of a three-phase motor, such as clockwise rotation or counterclockwise rotation, or control of the objects (such as electric wheelchairs, electric vehicles, etc.) applied by the motor to advance or Back, but not limited to the above.

The steering control system 10 of the present invention includes a set of three-phase motor coils 20, a set of three-phase induction circuits 30, a control circuit 40, and a control switch group 50. The three-phase motor coil 20 includes a first coil 21, a second coil 22 and a third coil 23. The three-phase induction circuit 30 includes a first induction circuit 31, a second induction circuit 32, and a third induction circuit 33. The three-phase induction circuit 30 is used to sense the position of a rotor.

In an embodiment, the control circuit 40 is used to provide three-phase coil signals 41, 42, 43 and receive three-phase induction signals 44, 45, 46, and the three-phase coil signals 41, 42, 43 are used to provide signals to the For the three-phase motor coil 20, the three-phase induction signals 44, 45, and 46 are from the three-phase induction circuit 30. The control switch group 50 is used to switch and control the three-phase coil signals 41, 42, 43 to the three-phase motor coil 20 and the three-phase induction signals 44, 45, and 46 from the three-phase induction circuit 30 at the same time to control Steering of the three-phase motor.

The steering control system of the present invention uses the control switch group to switch and control the three-phase coil signal and the three-phase induction signal at the same time, so as to correctly sense the position of the rotor after switching control, so that the control circuit does not need to change any circuits. Design or program modification to greatly save design costs and component costs, and reduce the complexity of component maintenance.

FIG. 2 shows a block diagram of a steering control system for a three-phase motor according to an embodiment of the present invention. With reference to FIG. 1 and FIG. 2, in an embodiment, the control switch group 50 simultaneously switches and controls the phases of two signals of the three-phase coil signals 41, 42, and 43 to the three-phase motor coil 20, and from The phase of the two of the three-phase induction signals 44, 45, and 46 of the three-phase induction circuit 30 corresponds to the phase of the two of the three-phase coil signals 41, 42, 43.

In one embodiment, the three-phase coil signal includes a first-phase coil signal 41, a second-phase coil signal 42 and a third-phase coil signal 43. The three-phase induction signal includes a first-phase induction signal 44, a second-phase induction signal 45 and a third-phase induction signal 46.

In one embodiment, the first coil 21 includes a first control terminal 211, the second coil 22 includes a second control terminal 221, and the third coil 23 includes a third control terminal 231. The first sensing circuit 31 includes a fourth control terminal 311, the second sensing circuit 32 includes a fifth control terminal 321, and the third sensing circuit 33 includes a sixth control terminal 331. The control switch group 50 has a connection side 51 and a signal side 52. The connection side 51 includes a plurality of connection terminals, which are electrically connected to the first control terminal 211, the second control terminal 221, and the third control terminal, respectively. Two of 231, and two of the fourth control terminal 311, the fifth control terminal 321, and the sixth control terminal 331 corresponding to the phase. In this embodiment, the connection side 51 is electrically connected to the first control terminal 211 and the second control terminal 221, and the fourth control terminal 311 and the fifth control terminal 321 corresponding to the phase.

In one embodiment, the signal side 52 includes a plurality of signal terminals, which are electrically connected to the first-phase coil signal 41, the second-phase coil signal 42, and the third-phase coil signal 43 respectively in corresponding phases. Two, and two of the first phase induction signal 44, the second phase induction signal 45, and the third phase induction signal 46 corresponding to the phase. In this embodiment, the signal side 52 is electrically connected to the first phase coil signal 41 and the second phase coil signal 42 of the corresponding phase, and the first phase induction signal 44 and the second phase induction of the corresponding phase. Signal 45.

In one embodiment, one of the first phase coil signal 41, the second phase coil signal 42, the third phase coil signal 43 and the first control terminal 211 and the second control terminal 221 of the corresponding phase And the other one of the third control terminal 231 is directly electrically connected; the first phase induction signal 44, the second phase induction signal 45, the third phase induction signal 46 of the corresponding phase and the corresponding phase are The other one of the fourth control terminal 311, the fifth control terminal 321, and the sixth control terminal 331 is directly electrically connected. In this embodiment, the third-phase coil signal 43 is directly electrically connected to the third control terminal 231, and the third-phase induction signal 46 is directly electrically connected to the sixth control terminal 331 of the corresponding phase.

In one embodiment, the control switch group 50 selectively switches and controls one of the first phase coil signal 41, the second phase coil signal 42, and the third phase coil signal 43 corresponding to the phase according to a turning signal 47. Two are electrically connected to two of the first control terminal 211, the second control terminal 221, and the third control terminal 231 of the corresponding phase, and simultaneously switch and control the first phase induction signal 44 of the corresponding phase, the The second phase sensing signal 45 and two of the third phase sensing signal 46 are electrically connected to two of the fourth control terminal 311, the fifth control terminal 321, and the sixth control terminal 331 of corresponding phases. In this embodiment, the control switch group 50 selectively switches and controls the first phase coil signal 41 and the second phase coil signal 42 of the corresponding phase and the first control terminal 211 and the second control terminal 221 of the corresponding phase. , And simultaneously switch and control the first phase induction signal 44 and the second phase induction signal 45 of the corresponding phase to the fourth control terminal 311 and the fifth control terminal 321 of the corresponding phase.

In an embodiment, the turning signal 47 includes a first turning signal and a second turning signal. The first turning signal may be a clockwise rotation signal, and the second turning signal may be a counterclockwise rotation signal. . According to the first turning signal, the first phase coil signal 41 is electrically controlled to be electrically connected to the first control terminal 211, and the second phase coil signal 42 is electrically connected to the second control terminal 221, and is simultaneously switched and controlled. The first phase induction signal 44 is electrically connected to the fourth control terminal 311, and the second phase induction signal 45 is electrically connected to the fifth control terminal 321. At this time, the first-phase coil signal 41 is provided to the first coil 21, and the second-phase coil signal 42 is provided to the second coil 22. In this case, the rotation of the three-phase motor is clockwise.

In an embodiment, according to the second turning signal, the first phase coil signal 41 is electrically controlled to be electrically connected to the second control terminal 221, and the second phase coil signal 42 is electrically connected to the first control terminal 211. And simultaneously switch and control the first phase induction signal 44 to be electrically connected to the fifth control terminal 321, and the second phase induction signal 45 to be electrically connected to the fourth control terminal 311. Therefore, the first phase coil signal 41 is provided to the second coil 22, the second phase coil signal 42 is provided to the first coil 21, the phase signals of the first coil 21 and the second coil 22 are reversed, and the The first induction circuit 31 and the second induction circuit 32 also switch correspondingly at the same time, so the rotation of the three-phase motor is counterclockwise, and the position of the rotor can be correctly sensed after switching control. The control circuit 40 does not need to Make any circuit change design or program modification to greatly save design cost and component cost, and reduce the complexity of component maintenance.

In an embodiment, the turning signal may be a signal sent by the control circuit, or a signal of a user directly using a manual switch (forward or reverse).

FIG. 3 shows a block diagram of a steering control system (first steering signal) for a three-phase motor according to another embodiment of the present invention. Referring to FIG. 3, in an embodiment, the control switch group 50 includes a first control switch 61, a second control switch 62, a third control switch 63, and a fourth control switch 64. The first control switch 61 Including a first connection terminal 611, a second connection terminal 612 and a first signal terminal 613, the first connection terminal 611 and the second connection terminal 612 are electrically connected to the first control terminal 211 and the second control respectively. Terminal 221, the first signal terminal 613 is electrically connected to the first phase coil signal 41; the second control switch 62 includes a third connection terminal 621, a fourth connection terminal 622, and a second signal terminal 623, the The three connection terminals 621 and the fourth connection terminal 622 are electrically connected to the second control terminal 221 and the first control terminal 211, respectively, and the second signal terminal 623 is electrically connected to the second phase coil signal 42; the third control The switch 63 includes a fifth connection terminal 631, a sixth connection terminal 632, and a third signal terminal 633. The fifth connection terminal 631 and the sixth connection terminal 632 are electrically connected to the fourth control terminal 311 and the first connection terminal 631, respectively. Five control terminals 321, the third signal terminal 633 is electrically connected to the first phase induction signal 44; the fourth control terminal The switch 64 includes a seventh connection terminal 641, an eighth connection terminal 642, and a fourth signal terminal 643. The seventh connection terminal 641 and the eighth connection terminal 642 are electrically connected to the fifth control terminal 321 and the first connection terminal 642, respectively. Four control terminals 311. The fourth signal terminal 643 is electrically connected to the second phase induction signal 45.

According to the first turning signal, the first connection terminal 611 of the first control switch 61 is electrically connected to the first signal terminal 613, so that the first phase coil signal 41 is electrically connected to the first control terminal 211; The third connection terminal 621 of the second control switch 62 is electrically connected to the second signal terminal 623, so that the second phase coil signal 42 is electrically connected to the second control terminal 221; The fifth connection terminal 631 is electrically connected to the third signal terminal 633, so that the first phase induction signal 44 is electrically connected to the fourth control terminal 311, and the seventh connection terminal 641 of the fourth control switch 64 is The fourth signal terminal 643 is electrically connected, so that the second phase induction signal 45 is electrically connected to the fifth control terminal 321. In this case, the rotation of the three-phase motor can be clockwise.

FIG. 4 shows a block diagram of a steering control system (second steering signal) for a three-phase motor according to another embodiment of the present invention. Referring to FIG. 4, according to the second turning signal, the second connection terminal 612 of the first control switch 61 is electrically connected to the first signal terminal 613, so that the first phase coil signal 41 and the second control terminal 221 Electrical connection; the fourth connection end 622 of the second control switch 62 is electrically connected to the second signal end 623, so that the second phase coil signal 42 is electrically connected to the first control end 211; the third The sixth connection terminal 632 of the control switch 63 is electrically connected to the third signal terminal 633, so that the first phase induction signal 44 is electrically connected to the fifth control terminal 321, and the eighth of the fourth control switch 64 is electrically connected. The connection terminal 642 is electrically connected to the fourth signal terminal 643, so that the second phase induction signal 45 is electrically connected to the fourth control terminal 311. In this case, the rotation of the three-phase motor is counterclockwise.

Therefore, in this embodiment, the first control switch 61, the second control switch 62, the third control switch 63, and the fourth control switch 64 of the control switch group 50 are used to make the first coil 21 and The phase signals of the second coil 22 are reversed, and the first induction circuit 31 and the second induction circuit 32 are also switched correspondingly at the same time to achieve the steering control of the three-phase motor. Similarly, the control circuit 40 does not need to perform any circuit change design or program modification, which can greatly save costs.

FIG. 5 shows a block diagram of a steering control system for a three-phase motor according to another embodiment of the present invention. Referring to FIG. 5, in an embodiment, the control switch group 50 includes a first electronic switch 71, a second electronic switch 72, a third electronic switch 73, a fourth electronic switch 74, and a fifth electronic switch 75. A sixth electronic switch 76, a seventh electronic switch 77, and an eighth electronic switch 78. The first electronic switch 71 includes a first connection terminal 711 and a first signal terminal 712. The first connection terminal 711 is electrically The fourth control terminal 311 is electrically connected, and the first signal terminal 712 is electrically connected to the first phase induction signal 44. The second electronic switch 72 includes a second connection terminal 721 and a second signal terminal 722. The connection terminal 721 is electrically connected to the fifth control terminal 321, and the second signal terminal 722 is electrically connected to the first phase induction signal 44. The third electronic switch 73 includes a third connection terminal 731 and a third signal terminal 732. The third connection terminal 731 is electrically connected to the fourth control terminal 311, and the third signal terminal 732 is electrically connected to the second phase induction signal 45. The fourth electronic switch 74 includes a fourth connection terminal 741 and a first connection terminal 741. Four signal terminals 742, the fourth connection terminal 741 is electrically connected to the fifth control terminal 321, and the fourth Terminal 742 is electrically connected to the second phase induction signal 45. The fifth electronic switch 75 includes a fifth connection terminal 751 and a fifth signal terminal 752. The fifth connection terminal 751 is electrically connected to the first control terminal 211. The fifth signal terminal 752 is electrically connected to the first-phase coil signal 41. The sixth electronic switch 76 includes a sixth connection terminal 761 and a sixth signal terminal 762. The sixth connection terminal 761 is electrically connected to the first phase coil 761. Two control terminals 221, the sixth signal terminal 762 is electrically connected to the first phase coil signal 41; the seventh electronic switch 77 includes a seventh connection terminal 771 and a seventh signal terminal 772, and the seventh connection terminal 771 is electrically connected The first control terminal 211 is electrically connected, and the seventh signal terminal 772 is electrically connected to the second phase coil signal 42. The eighth electronic switch 78 includes an eighth connection terminal 781 and an eighth signal terminal 782. The connection terminal 781 is electrically connected to the second control terminal 221, and the eighth signal terminal 782 is electrically connected to the second phase coil signal 42.

According to the first steering signal, the first electronic switch 71, the fourth electronic switch 74, the fifth electronic switch 75 and the eighth electronic switch 78 are turned on, and the second electronic switch 72, the third electronic switch 73, The sixth electronic switch 76 and the seventh electronic switch 77 are not conductive. The first connection terminal 711 of the first electronic switch 71 is electrically connected to the first signal terminal 712, so that the first phase induction signal 44 and the The fourth control terminal 311 is electrically connected; the fourth connection terminal 741 of the fourth electronic switch 74 is electrically connected to the fourth signal terminal 742, so that the second phase induction signal 45 is electrically connected to the fifth control terminal 321. Connection; the fifth connection terminal 751 of the fifth electronic switch 75 is electrically connected to the fifth signal terminal 752, so that the first phase coil signal 41 is electrically connected to the first control terminal 211, and the eighth control switch The eighth connection terminal 781 of 78 is electrically connected to the eighth signal terminal 782, so that the second phase coil signal 42 is electrically connected to the second control terminal 221. In this case, the rotation of the three-phase motor is clockwise.

According to the second steering signal, the first electronic switch 71, the fourth electronic switch 74, the fifth electronic switch 75, and the eighth electronic switch 78 are not conductive, and the second electronic switch 72 and the third electronic switch 73 The sixth electronic switch 76 and the seventh electronic switch 77 are turned on. The second connection terminal 721 of the second electronic switch 72 is electrically connected to the second signal terminal 722, so that the first phase induction signal 44 and the The fifth control terminal 321 is electrically connected; the third connection terminal 731 of the third electronic switch 73 is electrically connected to the third signal terminal 732, so that the second phase induction signal 45 is electrically connected to the fourth control terminal 311 Connection; the sixth connection terminal 761 of the sixth electronic switch 76 is electrically connected to the sixth signal terminal 762, so that the first phase coil signal 41 is electrically connected to the second control terminal 221, and the seventh control switch The seventh connection terminal 771 of 77 is electrically connected to the seventh signal terminal 772, so that the second phase coil signal 42 is electrically connected to the first control terminal 211. In this case, the rotation of the three-phase motor is counterclockwise.

Therefore, in this embodiment, the first electronic switch 71, the second electronic switch 72, the third electronic switch 73, the fourth electronic switch 74, the fifth electronic switch 75, The sixth electronic switch 76, the seventh electronic switch 77, and the eighth electronic switch 78 enable the phase signals of the first coil 21 and the second coil 22 to be reversed, and the first induction circuit 31 and the second The induction circuit 32 also switches correspondingly at the same time to achieve the steering control of the three-phase motor. Similarly, the control circuit 40 does not need to perform any circuit change design or program modification, which can greatly save costs.

In the above embodiment, the control switch group 50 is to switch and control two of the first-phase coil signal 41, the second-phase coil signal 42, and the third-phase coil signal 43, for example, the first-phase coil signal 41 and the second phase coil signal 42, and simultaneously switch and control the corresponding phases of the first phase induction signal 44, the second phase induction signal 45, and the third phase induction signal 46, for example: the first phase The phase sensing signal 44 and the second phase sensing signal 45. In other embodiments, the control switch group 50 can switch and control two of the first-phase coil signal 41, the second-phase coil signal 42, and the third-phase coil signal 43, for example, the second-phase coil signal. 42 and the third-phase coil signal 43, and simultaneously switch and control the corresponding phases of the first-phase induction signal 44, the second-phase induction signal 45, and the third-phase induction signal 46, for example, the second phase The phase induction signal 45 and the third phase induction signal 46. Alternatively, the control switch group 50 can switch and control two of the first-phase coil signal 41, the second-phase coil signal 42, and the third-phase coil signal 43, for example, the first-phase coil signal 41 and the first-phase coil signal 41. Three-phase coil signal 43, and simultaneously switch and control the corresponding phases of the first phase induction signal 44, the second phase induction signal 45, and the third phase induction signal 46, for example, the first phase induction signal 44 And the third phase induction signal 46.

The above embodiments are only for explaining the principle of the present invention and its effects, but not for limiting the present invention. Modifications and changes made by those skilled in the art to the above embodiments still do not violate the spirit of the present invention. The scope of rights of the present invention should be listed in the scope of patent application described later.

10‧‧‧steering control system

20‧‧‧Three-phase motor coil

21‧‧‧first coil

22‧‧‧Second Coil

23‧‧‧Third Coil

30‧‧‧Three-phase induction circuit

31‧‧‧first induction circuit

32‧‧‧Second induction circuit

33‧‧‧Third Induction Circuit

40‧‧‧Control circuit

41‧‧‧First phase coil signal

42‧‧‧Second Phase Coil Signal

43‧‧‧Third Phase Coil Signal

44‧‧‧First phase induction signal

45‧‧‧Second phase induction signal

46‧‧‧Third-phase induction signal

47‧‧‧ turn signal

50‧‧‧Control switch group

51‧‧‧connection side

52‧‧‧Signal side

61‧‧‧The first control switch

62‧‧‧Secondary control switch

63‧‧‧Third control switch

64‧‧‧Fourth control switch

71‧‧‧The first electronic switch

72‧‧‧Second electronic switch

73‧‧‧Third electronic switch

74‧‧‧Fourth electronic switch

75‧‧‧The fifth electronic switch

76‧‧‧Sixth electronic switch

77‧‧‧Seventh electronic switch

78‧‧‧Eighth Electronic Switch

211‧‧‧The first control terminal

221‧‧‧Second Control Terminal

231‧‧‧third control terminal

311‧‧‧Fourth control terminal

321‧‧‧Fifth control terminal

331‧‧‧Sixth control terminal

611‧‧‧first connection

612‧‧‧Second connection terminal

613‧‧‧The first signal terminal

621‧‧‧Third connection terminal

622‧‧‧Fourth connection terminal

623‧‧‧Second Signal Terminal

631‧‧‧ fifth connection

632‧‧‧the sixth connection terminal

633‧‧‧ third signal terminal

641‧‧‧Seventh connection

642‧‧‧eighth connection terminal

643‧‧‧The fourth signal terminal

711‧‧‧first connection

712‧‧‧The first signal terminal

721‧‧‧Second connection terminal

722‧‧‧Second Signal Terminal

731‧‧‧third connection

732‧‧‧ third signal terminal

741‧‧‧Fourth connection terminal

742‧‧‧The fourth signal terminal

751‧‧‧ fifth connection

752‧‧‧The fifth signal terminal

761‧‧‧ sixth connection terminal

762‧‧‧Sixth Signal Terminal

771‧‧‧seventh connection

772‧‧‧Seventh Signal Terminal

781‧‧‧eighth connection

782‧‧‧ eighth signal terminal

Figure 1 shows a block diagram of a steering control system for a three-phase motor according to the present invention;

2 shows a block diagram of a steering control system for a three-phase motor according to an embodiment of the present invention;

3 shows a block diagram of a steering control system (first steering signal) for a three-phase motor according to another embodiment of the present invention;

4 shows a block diagram of a steering control system (second steering signal) for a three-phase motor according to another embodiment of the present invention; and

FIG. 5 shows a block diagram of a steering control system for a three-phase motor according to another embodiment of the present invention.

Claims (16)

A steering control system for a three-phase motor includes: a set of three-phase motor coils including a first coil, a second coil and a third coil; a set of three-phase induction circuits including a first induction circuit, A second induction circuit and a third induction circuit, the three-phase induction circuit is used to sense the position of a rotor; a control circuit is used to provide and receive a three-phase coil signal, and the three-phase coil signal is used to Provide a signal to the three-phase motor coil, the three-phase induction signal is from the three-phase induction circuit; and a control switch group for switching and controlling the three-phase coil signal to the three-phase motor coil, and from the three-phase The three-phase induction signal of the induction circuit is used to control the steering of the three-phase motor. For example, the steering control system for a three-phase motor according to item 1, wherein the control switch group switches and controls the phase of the three-phase coil signal to two of the three-phase motor coils simultaneously, and from the three-phase induction The phase of the three-phase induction signal of the circuit corresponds to two of the signals. For example, the steering control system for a three-phase motor according to claim 2, wherein the three-phase coil signals include: a first-phase coil signal, a second-phase coil signal, and a third-phase coil signal. The signals include: a first-phase induction signal, a second-phase induction signal, and a third-phase induction signal. For example, the steering control system for a three-phase motor according to item 3, wherein the first coil includes a first control terminal, the second coil includes a second control terminal, and the third coil includes a third control terminal. The first induction circuit includes a fourth control terminal, the second induction circuit includes a fifth control terminal, the third induction circuit includes a sixth control terminal, and the control switch group has a connection side and a signal side, The connection side includes a plurality of connection terminals, which are electrically connected to two of the first control terminal, the second control terminal, and the third control terminal, and the fourth control terminal and the fifth control corresponding to the phase. The signal side includes two signal terminals, each of which is electrically connected to the first-phase coil signal, the second-phase coil signal, and the third-phase coil signal of a corresponding phase. Two, and two of the first-phase induction signal, the second-phase induction signal, and the third-phase induction signal of the corresponding phase, selectively switching and controlling the first-phase coil signal of the corresponding phase according to a turning signal The The second phase coil signal and two of the third phase coil signal are electrically connected to the first control terminal, the second control terminal and the third control terminal of the corresponding phase, and the control is switched at the same time. The first phase induction signal, the second phase induction signal, the third phase induction signal of the corresponding phase, and the fourth control terminal, the fifth control terminal, and the sixth control terminal of the corresponding phase. Electrical connection of two. For example, the steering control system for a three-phase motor according to the fourth item, wherein the first phase coil signal, the second phase coil signal, the third phase coil signal and the remaining one of the third phase coil signals and the first control of the corresponding phase Terminal, the second control terminal and the remaining one of the third control terminal are directly electrically connected; the first phase induction signal, the second phase induction signal, the third phase induction signal of the corresponding phase and The other one of the fourth control terminal, the fifth control terminal, and the sixth control terminal corresponding to the phase is directly electrically connected. For example, the steering control system for a three-phase motor according to item 4, wherein the connection side is electrically connected to the first control terminal, the second control terminal, the fourth control terminal, and the fifth control terminal, respectively. The signal side is electrically connected to the first phase coil signal, the second phase coil signal, the first phase induction signal, and the second phase induction signal, respectively. For example, the steering control system for a three-phase motor according to item 6, wherein the steering signal includes a first steering signal and a second steering signal. According to the first steering signal, the first phase coil signal is switched and controlled. The first control terminal is electrically connected, the second phase coil signal is electrically connected to the second control terminal, and the first phase induction signal is electrically controlled to be electrically connected to the fourth control terminal, and the second phase is simultaneously switched. The signal is electrically connected to the fifth control terminal. For example, the steering control system for a three-phase motor according to item 7, wherein, according to the second steering signal, the first phase coil signal and the second control terminal are electrically connected and switched, and the second phase coil signal and The first control terminal is electrically connected, and simultaneously switches and controls the first phase induction signal to be electrically connected to the fifth control terminal, and the second phase induction signal is electrically connected to the fourth control terminal. For example, the steering control system for a three-phase motor according to item 8, wherein the steering signal is a signal issued by the control circuit. For example, the steering control system for a three-phase motor according to item 8, wherein the steering signal is a signal of a manual switch. For example, the steering control system for a three-phase motor according to item 8, wherein the control switch group includes a first control switch, a second control switch, a third control switch, and a fourth control switch. The control switch includes a first connection terminal, a second connection terminal, and a first signal terminal. The first connection terminal and the second connection terminal are electrically connected to the first control terminal and the second control terminal, respectively. A signal terminal is electrically connected to the first phase coil signal; the second control switch includes a third connection terminal, a fourth connection terminal and a second signal terminal, and the third connection terminal and the fourth connection terminal are electrically connected to each other. The second control terminal is electrically connected to the first control terminal, the second signal terminal is electrically connected to the second phase coil signal; the third control switch includes a fifth connection terminal, a sixth connection terminal, and a third A signal terminal, the fifth connection terminal and the sixth connection terminal are electrically connected to the fourth control terminal and the fifth control terminal, respectively, and the third signal terminal is electrically connected to the first phase induction signal; the fourth control switch Including a seventh connection terminal, an eighth connection terminal and a A fourth signal terminal, the seventh connection terminal and the eighth connection terminal are electrically connected to the fifth control terminal and the fourth control terminal, respectively, and the fourth signal terminal is electrically connected to the second phase induction signal. For example, the steering control system for a three-phase motor according to claim 11, wherein according to the first steering signal, the first connection end of the first control switch is electrically connected to the first signal end, so that the first The phase coil signal is electrically connected to the first control terminal; the third connection terminal of the second control switch is electrically connected to the second signal terminal, so that the second phase coil signal is electrically connected to the second control terminal. ; The fifth connection end of the third control switch is electrically connected to the third signal end, so that the first phase induction signal is electrically connected to the fourth control end, and the seventh connection end of the fourth control switch It is electrically connected to the fourth signal terminal, so that the second phase induction signal is electrically connected to the fifth control terminal. For example, the steering control system for a three-phase motor according to item 11, wherein according to the second steering signal, the second connection end of the first control switch is electrically connected to the first signal end, so that the first The phase coil signal is electrically connected to the second control terminal; the fourth connection terminal of the second control switch is electrically connected to the second signal terminal, so that the second phase coil signal is electrically connected to the first control terminal. ; The sixth connection end of the third control switch is electrically connected to the third signal end, so that the first phase induction signal is electrically connected to the fifth control end, and the eighth connection end of the fourth control switch It is electrically connected to the fourth signal terminal, so that the second phase induction signal is electrically connected to the fourth control terminal. For example, the steering control system for a three-phase motor according to item 8, wherein the control switch group includes a first electronic switch, a second electronic switch, a third electronic switch, a fourth electronic switch, and a fifth An electronic switch, a sixth electronic switch, a seventh electronic switch, and an eighth electronic switch. The first electronic switch includes a first connection terminal and a first signal terminal, and the first connection terminal is electrically connected to the fourth connection terminal. A control end, the first signal end is electrically connected to the first phase induction signal; the second electronic switch includes a second connection end and a second signal end, and the second connection end is electrically connected to the fifth control end, The second signal terminal is electrically connected to the first phase induction signal; the third electronic switch includes a third connection terminal and a third signal terminal, the third connection terminal is electrically connected to the fourth control terminal, and the third The signal terminal is electrically connected to the second phase induction signal; the fourth electronic switch includes a fourth connection terminal and a fourth signal terminal, the fourth connection terminal is electrically connected to the fifth control terminal, and the fourth signal terminal is electrically connected to the fourth signal terminal. The second phase induction signal; The five electronic switch includes a fifth connection terminal and a fifth signal terminal, the fifth connection terminal is electrically connected to the first control terminal, the fifth signal terminal is electrically connected to the first phase coil signal; the sixth electronic switch It includes a sixth connection end and a sixth signal end, the sixth connection end is electrically connected to the second control end, the sixth signal end is electrically connected to the first phase coil signal; the seventh electronic switch includes a first Seven connection terminals and a seventh signal terminal, the seventh connection terminal is electrically connected to the first control terminal, the seventh signal terminal is electrically connected to the second phase coil signal; the eighth electronic switch includes an eighth connection terminal And an eighth signal terminal, the eighth connection terminal is electrically connected to the second control terminal, and the eighth signal terminal is electrically connected to the second phase coil signal. If the steering control system for a three-phase motor according to item 14, wherein the first electronic switch, the fourth electronic switch, the fifth electronic switch, and the eighth electronic switch are turned on according to the first steering signal, The second electronic switch, the third electronic switch, the sixth electronic switch and the seventh electronic switch are non-conductive, and the first connection terminal of the first electronic switch is electrically connected to the first signal terminal, so that the first A phase induction signal is electrically connected to the fourth control terminal; the fourth connection terminal of the fourth electronic switch is electrically connected to the fourth signal terminal, so that the second phase induction signal is electrically connected to the fifth control terminal. Connection; the fifth connection end of the fifth electronic switch is electrically connected to the fifth signal end, so that the first phase coil signal is electrically connected to the first control end, and the eighth connection of the eighth control switch The terminal is electrically connected to the eighth signal terminal, so that the second phase coil signal is electrically connected to the second control terminal. For example, the steering control system for a three-phase motor according to item 14, wherein the first electronic switch, the fourth electronic switch, the fifth electronic switch, and the eighth electronic switch are non-conductive according to the second steering signal. The second electronic switch, the third electronic switch, the sixth electronic switch, and the seventh electronic switch are turned on, and the second connection end of the second electronic switch is electrically connected to the second signal end, so that the first A phase induction signal is electrically connected to the fifth control terminal; the third connection terminal of the third electronic switch is electrically connected to the third signal terminal, so that the second phase induction signal is electrically connected to the fourth control terminal. Connection; the sixth connection end of the sixth electronic switch is electrically connected to the sixth signal end, so that the first phase coil signal is electrically connected to the second control end, and the seventh connection of the seventh control switch The terminal is electrically connected to the seventh signal terminal, so that the second phase coil signal is electrically connected to the first control terminal.