Motor control circuit, circuit board and electric transportation equipment

Abstract

The embodiment of the utility model discloses a motor control circuit, a circuit board and electric transportation equipment. When the motor control circuit is applied to the electric transportation equipment, if the electric transportation equipment is abnormally powered off, the normally-closed sub-circuit in the motor control circuit automatically closes the circuit, so that phase lines of motors connected to the two ends can be short-circuited together, and when the motors rotate under the action of external force, counter-acting force can be formed in the motors due to the electromagnetic principle; therefore, a certain braking force is provided to prevent the electric transportation equipment from moving. Under the abnormal condition, a user can use the electric transportation equipment more safely, and accidents are avoided. When the power-off electric transportation equipment can be controlled by a user, short circuit of a phase line can be completely or partially relieved by manually controlling the change-over switch, counter-acting force formed by rotation of the motor in the interior can be eliminated or weakened, the user can freely push the electric transportation equipment, and it is guaranteed that the electric transportation equipment is used in a safe state all the time.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the electric motor technical field, in particular to a motor control circuit, a circuit board and an electric transport device. BACKGROUND

[0002] With the continuous development of electronic technology, battery technology and other related technologies, the transport device based on motor driving is more and more widely used because of energy saving, environmental protection and easy control. The electric transport device driven by the motor to realize movement, from large standard commercial vehicles and passenger vehicles to electric bicycles, electric transport assist vehicles, electric agricultural vehicles, electric wheelchairs, electric strollers and the like, presents a rich application form.

[0003] The inventor found that when using the electric transport device such as the electric transport assist vehicle, the electric agricultural vehicle, the electric wheelchair and the electric stroller, the electric transport device with small use range, light self-weight load and simple brake system design will move down the slope when losing power on the ground with a certain slope, which may bring danger to the user using or riding. CONTENT OF THE UTILITY MODEL

[0004] The utility model provides a motor control circuit, a circuit board and an electric transport device to solve the technical problem that the electric transport device with simple brake system design loses power on the ground with a certain slope, and the gravity causes the electric transport device to move down the slope, which may bring danger to the user using or riding.

[0005] In the first aspect, the embodiment of the present application provides a motor control circuit, which comprises a normally closed sub-circuit and at least one switching switch.

[0006] Two ends of the normally closed sub-circuit are connected to different windings of the motor, and when the normally closed sub-circuit is closed, the windings connected at two ends of the normally closed sub-circuit are short-circuited.

[0007] Each switching switch is connected in series with one of the windings connected with the normally closed sub-circuit to control the on-off state of the series winding, and the windings connected in series with each switching switch are different.

[0008] The motor control circuit is applied to the electric transport equipment, if the electric transport equipment is abnormally powered off, the normally closed sub-circuit in the motor control circuit automatically closes the circuit, so that the phase lines of the motor connected at both ends can be short-circuited together, when external force makes the motor rotate, internal counterforce is formed due to electromagnetic principle, so as to provide certain braking force to prevent the electric transport equipment from moving. In abnormal situations, users can also use the electric transport equipment more safely to avoid accidents. When the powered-off electric transport equipment can be controlled by the user, the short circuit of the phase lines can be completely or partially removed by manually controlling the switch, so as to eliminate or weaken the counterforce formed in the internal motor rotation. The user can freely push the electric transport equipment, ensuring that the electric transport equipment is always used in a safe state.

[0009] The normally closed sub-circuit comprises at least one on-off switch, and the switch comprises at least one switch;

[0010] The first end of the at least one on-off switch is used to be connected to the first type of winding of the motor one by one, the second end of the at least one on-off switch is used to be connected to the second type of winding of the motor, the at least one on-off switch is in an open state when the motor is externally powered, the number of the second type of winding is one and is different from any winding in the first type of winding;

[0011] The at least one switch is used to be connected to the third type of winding one by one in series, so as to manually control the on-off state of the third type of winding, and the third type of winding is one or more windings in the first type of winding and the second type of winding.

[0012] The motor control circuit is applied to the electric transport equipment, if the electric transport equipment is abnormally powered off, the normally closed sub-circuit in the motor control circuit automatically closes the circuit, so that the phase lines of the motor connected at both ends can be short-circuited together, when external force makes the motor rotate, internal counterforce is formed due to electromagnetic principle, so as to provide certain braking force to prevent the electric transport equipment from moving. In abnormal situations, users can also use the electric transport equipment more safely to avoid accidents. When the powered-off electric transport equipment can be controlled by the user, the short circuit of the phase lines can be completely or partially removed by manually controlling the switch, so as to eliminate or weaken the counterforce formed in the internal motor rotation. The user can freely push the electric transport equipment, ensuring that the electric transport equipment is always used in a safe state.

[0013] The normally closed sub-circuit comprises a driving sub-circuit, the input end of the driving sub-circuit is used to access the external power supply of the motor; the output end of the driving sub-circuit is used to connect the driving end of the on-off switch, and the driving end is used to output a driving signal to control the on-off switch to be opened when the input end receives the working voltage provided by the external power supply.

[0014] The drive signal generated by the external power supply connected to the motor keeps the on-off switch open to avoid short circuit of the phase lines of the motor, thereby ensuring normal operation of the motor and normal driving of the electric transport equipment; when the external power supply loses working voltage, the on-off switch returns to the normally closed state, so that the phase lines of the motor are short-circuited, and a counterforce is formed in the motor during rotation, thereby ensuring safe operation of the electric transport equipment.

[0015] The normally closed sub-circuit comprises a first on-off switch and a second on-off switch, the first type of winding comprises a first phase winding and a second phase winding of the motor, and the second type of winding comprises a third phase winding;

[0016] The first end of the first on-off switch is configured to be connected to the first phase winding, the first end of the second on-off switch is configured to be connected to the second phase winding, and the second end of the first on-off switch and the second end of the second on-off switch are both configured to be connected to the third phase winding of the motor.

[0017] The two on-off switches can short all the three phase windings, so that the electromotive force generated by each phase due to external force can form a counterforce, thereby preventing the electric transport equipment from moving with the maximum braking force.

[0018] The switching switch comprises a first switching switch and a second switching switch, and the first switching switch and the second switching switch are configured to be connected in series with two windings of the first phase winding, the second phase winding and the third phase winding one by one, so as to manually control the on-off state of the two windings connected in series.

[0019] The two switching switches can disconnect all the short circuits of the three phase windings, so as to eliminate the braking force as much as possible when the user needs to push the electric transport equipment.

[0020] The first on-off switch and the second on-off switch are both relay switches.

[0021] The relay switch is used as the on-off switch, which can provide stable safety protection at low cost when the scheme is implemented.

[0022] The first switching switch and the second switching switch are integrated into a double-pole single-throw switch.

[0023] The double-pole single-throw switch can be operated once to release the braking when the user needs to release the braking.

[0024] In a second aspect, the embodiments of the present application provide a circuit board, which comprises the normally closed sub-circuit in the motor control circuit of any one of the first aspect.

[0025] The circuit board further comprises the switching switch in the motor control circuit of any one of the first aspect.

[0026] In a third aspect, the embodiments of the present application provide an electric transportation device, which comprises the motor control circuit of any of the first aspect.

[0027] The electric transportation device is an electric wheelchair.

[0028] The switch is arranged on a handle of the electric wheelchair.

[0029] The circuit board and the electric transportation device of the second aspect and the third aspect comprise the motor control circuit provided by any of the above embodiments, and have the corresponding functions and beneficial effects. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0031] Figure 1 A circuit architecture diagram of the motor control circuit provided by the embodiments of the present application;

[0032] Figure 2 A circuit principle diagram of the motor control circuit provided by the embodiments of the present application. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present application more clear, the following will further describe the embodiments of the present application in combination with the drawings. It can be understood that the specific embodiments described herein are used to explain the present application, rather than limit the present application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the present application are shown in the drawings, rather than all the structures.

[0034] It should be noted that, due to the limitation of the length, the present application does not exhaust all the optional embodiments, and those skilled in the art should be able to think of that, as long as the technical features are not contradictory, any combination of technical features can constitute an optional embodiment.

[0035] The following will describe each embodiment in detail.

[0036] The inventor finds that when using electric transport equipment such as electric transport vehicles, electric agricultural vehicles, electric wheelchairs, electric strollers and the like, the brake system of such electric transport equipment with small use range and light self-weight is usually designed to be simple. However, due to the user's own ability defects or the complexity of the application scene, when the electric transport equipment loses power on the ground with a certain slope, gravity will cause the electric transport equipment to move down the slope, which may bring danger to the user using or riding the electric transport equipment. For example, when the old or disabled people who cannot walk ride the electric wheelchair to go out into the slope, or when the children ride the electric stroller out of the adult's sight into the slope, if power failure occurs on the slope, gravity will cause the electric transport equipment to move down the slope. These users cannot control the electric transport equipment easily, and the electric transport equipment sliding down the slope may bring danger to the user using or riding the electric transport equipment.

[0037] To solve the above technical problems, the motor control circuit is applied to the electric transport equipment. If the electric transport equipment abnormally loses power, the motor control circuit can short the phase lines of the motor together. When external force makes the motor rotate, internal counterforce will be formed due to electromagnetic principle, thereby providing certain braking force to prevent the electric transport equipment from moving. In abnormal situations, the user can use the electric transport equipment more safely and avoid accidents. When the electric transport equipment losing power can be controlled by the user, the user can control the on-off switch manually to completely or partially remove the short circuit of the phase lines, eliminate or weaken the counterforce formed by the motor rotation, so that the user can freely push the electric transport equipment, and ensure that the electric transport equipment is always used in a safe state.

[0038] The motor control circuit in the embodiment of the application includes a normally closed sub-circuit and at least one on-off switch. The two ends of the normally closed sub-circuit are connected to different windings of the motor. When the normally closed sub-circuit is closed, the windings connected at the two ends of the normally closed sub-circuit are short-circuited. Each on-off switch is connected in series with one of the windings connected to the normally closed sub-circuit to control the on-off state of the winding in series. The windings in series with each on-off switch are different.

[0039] When the motor control circuit is applied to the electric transport equipment, if the electric transport equipment is abnormally powered off, the normally closed sub-circuit in the motor control circuit automatically closes the circuit, so that the phase lines connected to the motor at both ends can be short-circuited together. When external force makes the motor rotate, internal counterforce will be formed due to electromagnetic principle, thereby providing certain braking force to prevent the electric transport equipment from moving. In abnormal situations, users can also use the electric transport equipment more safely to avoid accidents. When the powered-off electric transport equipment can be controlled by the user, the short circuit of the phase lines can be completely or partially removed by manually controlling the switching switch, so as to eliminate or weaken the counterforce formed in the internal motor rotation. The user can freely push the electric transport equipment, thereby ensuring that the electric transport equipment is always used in a safe state.

[0040] In a specific implementation, the normally closed sub-circuit includes at least one on-off switch, and the switching switch includes at least one switching switch; a first end of the at least one on-off switch is used to be connected to the first type of winding of the motor one by one, a second end of the at least one on-off switch is used to be connected to the second type of winding of the motor, the at least one on-off switch is in an open state when the motor is externally powered, the number of the second type of winding is one and is different from any winding in the first type of winding; the at least one switching switch is used to be connected to the third type of winding one by one in series, so as to manually control the on-off state of the third type of winding, and the third type of winding is one or more windings in the first type of winding and the second type of winding.

[0041] In the motor, including three-phase winding, the motor control circuit in the embodiment of the application includes a normally closed sub-circuit and at least one switching switch, at least one on-off switch is arranged in the normally closed sub-circuit, the first end of each on-off switch is used to be connected with different windings of the motor respectively (if there is only one on-off switch, there is only one first end connected to one winding, if there are multiple on-off switches, there are multiple first ends connected to different windings respectively, and the windings connected by the first ends of all on-off switches are collectively referred to as the first type of winding), the second end of each on-off switch is used to be connected with the same winding of the motor, and the on-off switch is in the open state in the case that the motor is externally powered, and any winding in the same winding and the winding connected by the first end is different, the winding connected by the second end is defined as the second type of winding in the embodiment of the application, that is, the second type of winding is only one, and is different from any winding in the first type of winding. When the motor control circuit in the embodiment of the application is used in the motor, when the motor is externally powered, each winding is normally powered; when the motor is not externally powered, the on-off switch is in the closed state, the winding connected by the first end of all on-off switches is short-circuited with the winding connected by the second end of the on-off switch, and all the windings connected by the first end are short-circuited, when external force makes the motor rotate, the electromotive force generated by any winding due to electromagnetic principle will form a counter force in the short-circuited other windings, thereby providing a certain braking force to prevent the electric transport equipment from moving.

[0042] For example, one on-off switch is arranged in the normally closed sub-circuit, according to the above description of the connection of the on-off switch, the first end and the second end of the on-off switch are connected to two windings (for example, U phase and V phase, at this time, U phase is the first type of winding, V phase is the second type of winding, the windings in the motor are symmetrical, and the connection effect of any two windings is actually the same) in the motor. When the motor is externally powered, the on-off switch is open, the U phase, the V phase and the W phase are normally powered and operated; when the motor is not externally powered, the on-off switch is closed, the U phase and the V phase are short-circuited, the electromotive force generated by the U phase and the V phase due to electromagnetic principle will form a counter force in the short-circuited V phase and U phase, thereby providing a certain braking force to prevent the electric transport equipment from moving.

[0043] In the embodiment of the present application, the winding connected to the on-off switch is specifically the winding connected to the first end and the winding connected to the second end (i.e. the first type winding and the second type winding); at least one switching switch is connected in series to different windings of the winding connected to the on-off switch, which is specifically at least one winding of the winding connected to the first end and the winding connected to the second end corresponding to the series connection of one switching switch. The switching switch can control the disconnection state of the winding and the external connection, i.e. can disconnect the short circuit state of the winding and other windings. The winding connected in series to the switching switch is the third type winding. In the specific implementation process, because the disconnection is mutual, for example, only the U phase is provided with the switching switch, and the U phase and the V phase are originally short-circuited. When the connection between the U phase and the external (V phase) is disconnected through the switching switch, the V phase is also disconnected from the U phase. Therefore, in the case that the first end and the second end of the on-off switch are connected to two windings in total, for the winding connected to the on-off switch, one winding can be provided without the switching switch, i.e. the disconnection of all windings can be realized. Of course, only one (the minimum number) can be provided with the switching switch, i.e. one winding is disconnected from the short circuit. It is inevitable to weaken the reaction force (according to the number of windings connected to the on-off switch, all or part of the windings are weakened), so as to facilitate the user to recover the control of the electric transport equipment after pushing.

[0044] Figure 1 is a circuit schematic diagram of a motor control circuit provided by the embodiment of the present application. In the embodiment, two on-off switches 121 are provided, each phase winding can be short-circuited, two switching switches 11 (i.e. a first switching switch 111 and a second switching switch 112) are provided, and each phase winding can be disconnected from the short circuit. As shown in Figure 1 , the motor control circuit comprises a normally closed sub-circuit 12 and two switching switches 11. The normally closed sub-circuit 12 comprises two on-off switches 121, and the switching switch 11 comprises a first switching switch 111 and a second switching switch 112. The first end of the two on-off switches 121 is used for being connected to the first phase winding (exemplarily V phase in Figure 1 ) and the second phase winding (exemplarily W phase in Figure 1 ) of the motor 10, i.e. the V phase and the W phase are the first type winding. The second end of the two on-off switches 121 is used for being connected to the third phase winding (exemplarily U phase in Figure 1The third phase winding (U phase) is connected to the first and second phase windings, i.e., the third phase winding (U phase) is a second type winding. The two on-off switches 121 are in an open state when the motor 10 is externally powered, and the first phase winding, the second phase winding, and the third phase winding are different windings in the three-phase winding of the motor. The first switch 111 is connected in series with the first phase winding of the motor, and the second switch 112 is connected in series with the second phase winding of the motor, i.e., the V phase and the W phase are third type windings, so as to manually control the on-off state of the first phase winding and the second phase winding. It should be noted that, because the three-phase winding in the motor is symmetrical, the first phase winding, the second phase winding, and the third phase winding only refer to different three-phase windings in the motor, and which one of the U phase, the V phase, and the W phase is the first phase winding, the second phase winding, and the third phase winding does not affect the implementation effect of the scheme.

[0045] Corresponding to the overall design idea described above, the normally closed sub-circuit can also include a first on-off switch and a second on-off switch, and the first type winding includes a first phase winding and a second phase winding of the motor. The first end of the first on-off switch is configured to be connected to the first phase winding, and the first end of the second on-off switch is configured to be connected to the second phase winding. The second end of the first on-off switch and the second end of the second on-off switch are both configured to be connected to a third phase winding of the motor. The switch includes a first switch and a second switch, and the first switch and the second switch are connected in series with two windings in the first phase winding, the second phase winding, and the third phase winding one by one, so as to manually control the on-off state of the two windings connected in series.

[0046] In the embodiment of the present application, the external power supply of the motor refers to the power supply connected from the outside of the motor, for example, the power supply of the battery matched with the motor. The first phase winding, the second phase winding, and the third phase winding in the embodiment of the present application are three-phase windings of the motor, and the specific corresponding relationship is not limited. The two-phase winding or three-phase winding can be short-circuited through the normally closed sub-circuit. In the case of external power supply, for example, in the case that the battery can provide a working voltage, the on-off switch in the normally closed sub-circuit remains open in the case of external power supply, the battery supplies power to the three-phase winding of the motor, and the motor is mainly in a working state. In the case of no external power supply, for example, in the case that the battery cannot provide a working voltage, the on-off switch in the normally closed sub-circuit cannot continue to remain open in the case of no external power supply, thereby entering a closed state, and two phases or three phases in the first phase winding, the second phase winding, and the third phase winding are short-circuited. At this time, if the motor does not rotate, there is no current in the motor, and if the motor rotates, the motor is mainly in a power generation state, and the generated electricity is fed to the inside of the motor through the short-circuited winding, so that the inside of the motor forms a counterforce relative to the rotation direction of the motor due to the electromagnetic principle, thereby reducing the rotation speed of the motor.

[0047] In the embodiment of the present application, when the motor control circuit is applied to the electric transport device, if the electric transport device is abnormally powered off, the motor control circuit can short the phase lines of the motor together. When external force makes the motor rotate, internal counterforce will be formed due to electromagnetic principle, thereby providing certain braking force to prevent the electric transport device from moving. If the slope is steep, the acceleration of the electric transport device moving downward due to gravity is large, the motor speed is also increased faster than the position of the gentle slope, and the corresponding greater counterforce can be provided, effectively reducing the acceleration process of the electric transport device, and the movement speed of the electric transport device losing power on the slope is effectively controlled. In abnormal situations, users can also use the electric transport device more safely to avoid accidents. When the powered-off electric transport device can be controlled by the user, the short circuit of the phase lines can be removed by the switch to eliminate the counterforce formed by the motor rotation inside, and the user can freely push the electric transport device to ensure that the electric transport device is always used in a safe state. The electric transport device originally lacking an emergency brake design can provide effective braking force when it is powered off and slides down the slope, effectively inhibiting automatic sliding. The electric transport device can maintain stability and safety even in a powered-off state, effectively reducing the risk of accidental injury. Moreover, in the case of power failure of the electric transport device, manual pushing may also be needed, for example, the electric wheelchair sliding down the slope is controlled by the caregiver and needs to be pushed into a safe area. At this time, no braking is needed, and the caregiver can disconnect the short-circuited phase lines of the motor by the switch to avoid continuous resistance during the pushing process, facilitating the movement of the electric wheelchair by the caregiver. Of course, other electric transport devices also have the same effect, and the different use scenarios and different transported people or objects do not affect the triggering and release of the entire braking mechanism, ensuring safety in various application scenarios.

[0048] In the specific implementation process, two on-off switches 121 can be designed, and when the motor 10 loses external power supply, the three-phase windings are short-circuited with each other. At the same time, only one switch 11 can be provided, that is, when one phase winding is disconnected, the other two phase windings remain short-circuited, thereby weakening the counterforce to a certain extent. Of course, two switches 11 or three switches 11 can also be provided, that is, all three phase windings are disconnected from the short circuit, and the effect of weakening the counterforce is the same when two switches 11 and three switches 11 are provided, that is, all short circuits of the windings are disconnected, and all counterforces are eliminated.

[0049] In the specific implementation process, one on-off switch 121 can also be designed, and only two phase windings are short-circuited with each other when the motor 10 loses external power supply. At the same time, one switch 11 or two switches 11 can be provided, and the effect of weakening the counterforce is the same when one switch 11 and two switches 11 are disconnected, that is, all short circuits of the windings are disconnected, and all counterforces are eliminated.

[0050] In one specific implementation, as shown in Figure 2 the normally closed sub-circuit includes a driving sub-circuit 122, an input end of the driving sub-circuit 122 being used to access an external power supply of the motor; an output end of the driving sub-circuit 122 being used to connect a driving end of the on-off switch, the driving end being used to output a driving signal to control the on-off switch to be turned off in the case that the input end receives a working voltage provided by the external power supply. The driving signal generated by accessing the external power supply of the motor makes the on-off switch remain to be turned off to avoid the phase line of the motor to be short-circuited, thereby ensuring the normal operation of the motor to normally drive the electric transportation equipment; in the case that the external power supply loses the working voltage, the on-off switch returns to the normally closed state, so that the phase line of the motor is short-circuited, and a counterforce is formed in the motor when the motor rotates, thereby ensuring the safe operation of the electric transportation equipment.

[0051] In another optional implementation, the first on-off switch and the second on-off switch are both relay switches. Using the relay switch as the on-off switch can ensure stable safety protection at low cost when the present scheme is implemented.

[0052] In yet another optional implementation, the on-off states of the first on-off switch and the second on-off switch are controlled by the same relay or different relays. The on-off states of the two on-off switches are controlled by the same relay or different relays, which can be flexibly selected according to the material management cost or product configuration requirement. The on-off states are controlled by the same relay, for example, a double-pole single-throw switch R1 driven by a relay as shown in Figure 2 The on-off states are controlled by different relays, for example, two single-pole single-throw switches driven by relays.

[0053] As shown in Figure 2 the switching switch can be a double-pole single-throw switch S1, that is, the first switching switch and the second switching switch are integrated into the double-pole single-throw switch S1. By using the double-pole single-throw switch S1, the user can complete the release in one operation when the user needs to release the brake.

[0054] The present application also provides a circuit board including the normally closed sub-circuit in the motor control circuit in the previous embodiment. In addition, the circuit board can also include the switching switch in the motor control circuit in the previous embodiment.

[0055] In the implementation process, considering that the installation position of the motor is usually far away from the operation position of the user when using the electric transportation device, various circuit board layouts are provided in the embodiments of the present application. For example, only the normally closed sub-circuit is arranged on the circuit board, and the circuit board is used to be installed near the motor, and the switching switch can be directly installed at the handrail or handle position of the electric transportation device based on the structure design without the circuit board, which is convenient for operation. The normally closed sub-circuit and the switching switch can also be arranged on the circuit board, and the circuit board is used to be installed internally near the handrail or handle, and is connected to the motor through wiring. Of course, the circuit board can also be designed in a split manner, i.e., the normally closed sub-circuit and the switching switch are arranged on a circuit sub-board.

[0056] Finally, the embodiments of the present application provide an electric transportation device including the motor control circuit of any one of the first embodiments. The electric transportation device in the embodiments of the present application is, for example, an electric wheelchair, an electric stroller, an electric agricultural vehicle, etc. For each electric transportation device, the switching switch is arranged at a position close to the hand of the user when operating, for example, the switching switch is arranged at the handle of the electric wheelchair.

[0057] The circuit board and the electric transportation device include the motor control circuit provided by any one of the above embodiments, and have the corresponding functions and advantages.

[0058] It should be further noted that the terms "comprising", "containing" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of another identical element in the process, method, article or device including the element.

[0059] It should be noted that the above is only a preferred embodiment of the present application and the technical principle applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A motor control circuit, characterized in that, Includes a normally closed sub-circuit and at least one switching switch; The two ends of the normally closed sub-circuit are connected to different windings of the motor. When the normally closed sub-circuit is closed, the windings connected to the two ends of the normally closed sub-circuit are short-circuited. Each of the switching switches is connected in series with one of the windings in the normally closed sub-circuit to control the on / off state of the winding connected in series, and the windings connected in series with each switching switch are different.

2. The motor control circuit according to claim 1, characterized in that, The normally closed sub-circuit includes at least one on / off switch; The first end of the at least one on / off switch is used to be connected to the first type of winding of the motor in a one-to-one correspondence, and the second end of the at least one on / off switch is used to be connected to the second type of winding of the motor. The at least one on / off switch is in the off state when the motor has external power supply. The number of the second type of winding is one and it is different from any winding in the first type of winding. The at least one switching switch is connected in series with the third type of winding in a one-to-one correspondence, so as to manually control the on / off state of the third type of winding, wherein the third type of winding is one or more windings among the first type of winding and the second type of winding.

3. The motor control circuit according to claim 2, characterized in that, The normally closed sub-circuit further includes a drive sub-circuit. The input terminal of the drive sub-circuit is used to connect to the external power supply of the motor. The output terminal of the drive sub-circuit is used to connect to the drive terminal of the on / off switch. The drive terminal is used to output a drive signal when the input terminal receives the working voltage provided by the external power supply, so as to control the on / off switch to open.

4. The motor control circuit according to claim 2 or 3, characterized in that, The normally closed sub-circuit includes a first on / off switch and a second on / off switch; the first type of winding includes the first phase winding and the second phase winding of the motor; and the second type of winding is the third phase winding. The first terminal of the first on / off switch is used to connect to the first phase winding, the first terminal of the second on / off switch is used to connect to the second phase winding, and the second terminals of both the first on / off switch and the second on / off switch are used to connect to the third phase winding of the motor.

5. The motor control circuit according to claim 4, characterized in that, The switching switch includes a first switching switch and a second switching switch. The first switching switch and the second switching switch are used to be connected in series with two windings from the first phase winding, the second phase winding and the third phase winding, respectively, so as to manually control the on and off states of the two windings connected in series.

6. The motor control circuit according to claim 4, characterized in that, Both the first on / off switch and the second on / off switch are relay switches.

7. The motor control circuit according to claim 5, characterized in that, The first and second switching switches are integrated into a double-pole single-throw switch.

8. A circuit board, characterized in that, Includes the normally closed sub-circuit in the motor control circuit according to any one of claims 1-7.

9. The circuit board according to claim 8, characterized in that, It also includes the switching switch in the motor control circuit according to any one of claims 1-7.

10. An electric transport device, characterized in that, The electric transport equipment includes the motor control circuit according to any one of claims 1-7.

11. The electric transport equipment according to claim 10, characterized in that, The electric transport device is an electric wheelchair.

12. The electric transport equipment according to claim 11, characterized in that, The switch is located on the handle of the electric wheelchair.

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