190results about "AC motor direction control" patented technology

The invention provides a carrier rocket engine stage-switching motor redundancy control system, which is combined with a multi-input instruction redundancy voting method, a voting path software and hardware arbitration method and the like to complete high-reliability carrier rocket engine stage-switching motor control. According to the system, two-out-of-three voting is carried out by using a triple-redundancy input control instruction and interactive heartbeat, software and hardware joint arbitration is carried out on voting results of three modules, and an instruction control channel is determined to complete phase sequence control of the stage conversion winding. The method has strong fault capability, has no single-point failure link, and can ensure the normal operation of the engine conversion motor in the flight process of the carrier rocket.

The invention provides a driving circuit control method and system and a vehicle, and the method comprises the steps: responding to a driving circuit control instruction, and entering a vehicle window driving mode or a wireless charging mode; under the condition of the vehicle window driving mode, the battery voltage is adjusted to be first voltage through the voltage converter and then output to the driving circuit, the driving circuit drives the motor to rotate, and the vehicle window is controlled to ascend or descend; under the condition of a wireless charging mode, the voltage converter adjusts the battery voltage into a second voltage and outputs the second voltage to the driving circuit, and the driving circuit activates the resonance circuit to generate resonance to transmit electric energy. The driving circuit for controlling the vehicle window can be reused for wireless charging, the problem that repeated components cannot be reused due to the fact that the vehicle window driving circuit and the wireless charging module are designed separately is solved, and the circuit cost is reduced. By sharing the voltage converter, the problem of large space occupation caused by discrete design between the vehicle window driving circuit and the wireless charging module is solved.

The invention relates to the technical field of motor control, in particular to a coating machine die head motor control method and system based on a neural network model. The method comprises the following steps: acquiring real-time position data, rotation direction identification data and angular velocity change data of each section of motor of the die head of the coating machine and torque feedback data of each section of gap adjusting mechanism, and forming a multidimensional motor state data set containing time sequence marks; constructing a direction sensitive activation function according to the rotation direction identification data and the angular velocity change data; and setting a forward weight coefficient and a reverse weight coefficient based on a direction sensitive activation function to carry out dynamic switching mechanism simulation on the direction dependence characteristic of the mechanical gap. According to the method, inter-segment torque propagation and stress waves are analyzed in combination with the neural network model, multi-segment coordination compensation is achieved, and the problem of inter-segment coupling interference is solved.

The invention discloses a motor control method and device and a computer program product, and the method comprises the steps: increasing or reducing the change number of Hall pulses in the current driving process after a motor is driven, so as to update the position of the motor; when the motor moves to a limit position and triggers locked-rotor, stopping motor driving, and setting the updated motor position as a hard stop position; increasing or decreasing a preset number of Hall pulses on the hard stop position as a soft stop position; and when the motor reaches the soft stop position in the process of moving towards the hard stop position, motor driving is stopped. According to the invention, accurate memory of the hard stop position of the motor and real-time identification of the current position are realized, so that in the driving process of the motor, pre-judgment can be carried out in advance, the locked-rotor condition can be actively avoided, damages such as overheating and abrasion caused by locked-rotor are effectively prevented, and the service life of the motor is remarkably prolonged.

The invention relates to a refrigeration stirring mechanism, an operation method and system thereof and a storage medium, and relates to the technical field of refrigeration, and the method comprises the steps that in response to mode selection operation of the refrigeration stirring mechanism, the operation mode and manufacturing completion conditions of the refrigeration stirring mechanism are determined; a motor rotation scheme of the refrigeration stirring mechanism is set according to the operation mode, the motor rotation scheme comprises the motor rotation speed, the forward rotation duration and the reverse rotation duration, and the ratio of the reverse rotation duration to the forward rotation duration is located in a preset interval; determining a set temperature of the refrigeration stirring mechanism from the operation mode; a stirring motor in the refrigeration stirring mechanism is controlled to operate according to the motor rotation scheme, an evaporator in the refrigeration stirring mechanism is controlled to operate according to the set temperature, and each rotation of the stirring motor at least comprises one-time forward rotation and one-time reverse rotation; a fabrication completion signal is generated in response to the fabrication completion condition being satisfied. The refrigeration stirring mechanism has the effects that stirring is more sufficient, and the refrigeration efficiency is improved.

The utility model discloses a motor forward and reverse rotation control circuit capable of preventing interphase short circuit. The motor forward and reverse rotation control circuit comprises a master control switch QF1, a stop button SB1, a forward rotation start button SB2, a reverse rotation start button SB3, a forward rotation contactor KM1, a reverse rotation contactor KM2, a time relay KT, a first relay KA, a start permission indication lamp HL1 and a start dispermission indication lamp HL2. Through mutual cooperation of a stop button SB1, a time relay KT and a start-not-allowed indicating lamp HL2, a set time interval exists between stopping of the motor and restarting of the motor, and through lighting of the start-not-allowed indicating lamp HL2, it is clearly indicated that a forward rotation start button SB2 or a reverse rotation start button SB3 is forbidden to be pressed down, so that the situation that forward rotation of the motor is not completely stopped, and the motor cannot be started again is avoided. When the motor rotates, the motor rotates reversely, or the motor rotates forwards if the reverse rotation is not stopped completely, and when the rotating direction of the motor is switched, the set time of the time relay KT can ensure that the motor is stopped completely, so that the problem of inter-phase short circuit is avoided, and safe production is ensured.

The present application provides a control device of an electric motor, which can quickly and effectively stop at a specific position, thereby achieving further high-speed positioning. The control device of the electric motor is used for stopping a rotating shaft rotating at a specified speed at a specific position after a stop instruction, and comprises: a first time calculation unit, which calculates a first time for stopping the rotating shaft at a target stop position without changing the rotating direction according to a current speed, the target stop position and an acceleration at the time of positioning; a second time calculation unit, which calculates a second time for stopping the rotating shaft at the target stop position by rotating the rotating shaft in the reverse direction after temporarily stopping the rotation of the rotating shaft according to the current speed, the target stop position and the acceleration at the time of positioning; a comparison unit, which compares the first time with the second time; and a directional stop control unit, which performs stop control of the electric motor in a manner of shortening the time until the rotating shaft is stopped at the target stop position based on the comparison result of the comparison unit.

The embodiment of the utility model provides a motor positive and negative rotation control circuit and system and a clothes airing machine, and relates to the technical field of electronic circuits. The circuit comprises a first module which comprises an H-bridge circuit composed of MOS tubes, and the H-bridge circuit is respectively connected with two ports of a motor; the second module comprises a bypass capacitor and a first resistor which are connected in parallel; wherein the first module is respectively connected with the control chip, the power supply, the ground and a port for providing working voltage; the positive electrode end of the second module is connected to a branch where the first module is connected with the power supply and the port for providing the working voltage, and the other end is grounded. The precision and stability of motor control can be improved, and the cost is reduced.

The application provides a motor braking device, which comprises a frame, a first solenoid for controlling the forward rotation of the motor and a second solenoid for controlling the reverse rotation of the motor are arranged in the frame respectively; the first solenoid and the second solenoid each comprise a coil, a moving iron core and a static iron core, the static iron core is sleeved on one end of the moving iron core, and the coil is arranged on the outer side of the moving iron core and the static iron core; one end of the moving iron core is arranged outside the static iron core and connected with a first driving element, the other end of the moving iron core is connected with a second driving element, the first driving element is connected with a driving switch, and the second driving element is connected with a limit switch through a third driving element. The two solenoids are arranged to control the forward and reverse rotation of the motor respectively, the coils of the two solenoids are electrified to control the forward and reverse rotation of the motor respectively, and the coils are automatically connected with a standby braking circuit after losing electricity; when a switch SL3 in the electric circuit is actuated, the motor is instantaneously braked, and the braking is rapid and reliable.

To provide a fastening tool capable of restraining or preventing dispersion of a stop position when a driving mechanism stops.SOLUTION: The fastening tool includes a motor having a motor shaft, a housing, a pin-gripping part, a driving mechanism connected to the pin-gripping part and configured to perform rearward movement and forward movement, a position acquisition part configured to acquire a relative position of the driving mechanism, and a motor control part configured to switch a moving direction and a moving speed of the driving mechanism. The motor control unit starts forward movement of the shaft such that the movement speed becomes a first speed, decelerates the movement speed to a second speed slower than the first speed by PWM control for changing a duty ratio output to the motor when the acquired relative position reaches a deceleration position behind the initial position in the forward movement, and stops driving of the motor when the acquired relative position reaches a predetermined braking position in front of the deceleration position and behind the initial position.SELECTED DRAWING: Figure 11

The utility model discloses a motor driving circuit, a PCB and a motor. The motor driving circuit comprises a three-phase H-bridge circuit unit and a driving unit. The three-phase H-bridge circuit unit comprises a U-phase H-bridge circuit, a V-phase H-bridge circuit and a W-phase H-bridge circuit, and each phase of H-bridge circuit comprises an upper bridge arm switch tube and a lower bridge arm switch tube; the drain electrode of the upper bridge arm switch tube of each phase H-bridge circuit is connected with the positive electrode of a power supply, the source electrode is connected with a CON point, the drain electrode of the lower bridge arm switch tube is connected with the CON point, and the source electrode is grounded; the driving unit comprises six paths of driving signal lines which are respectively connected with grid electrodes of the H-bridge circuit switch tubes of all phases and are used for switching and outputting conduction levels of the bridge arm switch tubes of all phases according to chip signals. Stable switching of forward rotation and reverse rotation of the motor can be achieved, fan blades can be driven to periodically and reversely rotate, accumulated dust is promoted to be separated from the surfaces of the blades, and long-term efficient heat dissipation of the fan is maintained.

The utility model discloses a motor control circuit and a pedestal pan. The motor control circuit comprises a control module, a first switch module, a second switch module and an impedance module. The control module, the motor, the first switch module, the second switch module and the impedance module are electrically connected to the first node and the second node. The control module outputs a first voltage signal or a second voltage signal. The first switch module responds to the first voltage signal and establishes a path for current to flow from the first node to the second node, so that the motor rotates in the first direction. And the first switch module responds to the second voltage signal and establishes a path for the current to flow from the second node to the first node, so that the motor rotates in the second direction. The second switch module is turned on in response to the motor outputting back electromotive force to the first node to establish an electrical connection between the second end of the impedance module and the second end of the motor. By means of the mode, the closestool cover can be controlled to be normally closed and opened, and meanwhile slow descending of the closestool cover when the closestool cover is closed is achieved.

The utility model discloses a lubricating pump of a progressive lubricating system. The lubricating pump comprises a plunger pump component, an electric control board component, a plunger driving component and an oil storage barrel. The plunger pump component comprises a pump body, a plunger and an oil outlet one-way valve, a plunger hole, an oil suction hole and an oil outlet hole are formed in the pump body, one end of the oil suction hole is connected with the inner wall of the plunger hole, the other end of the oil suction hole is connected with the oil storage barrel, and the oil inlet side and the oil outlet side of the oil outlet one-way valve are connected with the plunger hole and the oil outlet hole respectively; the electric control plate component is electrically connected with the plunger driving component, and the plunger driving component is connected with the plunger, so that the electric control plate component controls the plunger driving component to drive the plunger to axially reciprocate along the plunger hole. The utility model not only has large oil output, but also has the advantages of simple structure, reliable work, compact layout and the like.

The utility model provides a system for automatic frequency conversion control of high-voltage equipment, which comprises an alternating-current power supply module and a direct-current control voltage output circuit which are connected with the input end of a frequency converter, and the output end of the frequency converter is connected with an alternating-current voltage regulator motor through a motor control circuit. The direct current control voltage output circuit composed of the upper computer and the analog quantity conversion module controls the frequency converter to output voltage so as to control the rotating speed of the motor of the alternating current voltage regulator, the frequency converter and alternating current motor voltage regulation control mode is used, compared with direct current motor speed regulation, the anti-interference capability is higher, and the control over the rotating speed of the motor of the alternating current voltage regulator is achieved. The problem that a carbon brush in the direct current motor is easy to damage is solved, the service life of the motor is longer, and compared with the direct current motor, the speed regulation range is wider, the circuit structure is simple and the reliability is high; an analog quantity conversion module in the direct-current control voltage output circuit can output a control instruction of the upper computer as direct-current control voltage, and output of the frequency converter is controlled through the direct-current voltage.

The present application relates to an electric-motor control system for a movable furniture unit. The electric-motor control system comprises an electric motor, a power source, a manually controlled switch and a pinch protection execution switch, wherein the pinch protection execution switch may be switched between a first execution position and a second execution position; at the first execution position, the electric motor is connected to the manually controlled switch by means of the pinch protection execution switch, and the polarity of a voltage that the power source applies to the electric motor is changed by means of switching the manually controlled switch; and at the second execution position, the electric motor is connected to the power source by means of the pinch protection execution switch, and the electric motor rotates and drives the furniture unit to extend so as to realize pinch protection. The present invention further relates to a pinch protection apparatus and a pinch protection system for a movable furniture unit, and the movable furniture unit.

The invention discloses an anti-pinch control method for a tail door of an electric automobile, and belongs to the technical field of electric automobiles. Comprising the steps of collecting and updating driving motor working data; anti-pinch pre-judgment is carried out; obtaining a time interval t1 when the anti-pinch pre-judgment takes effect; performing state estimation on the torque in the time interval t1 through a steady-state Kalman filtering algorithm; calculating a sliding square average value TM of the torque estimation value in the time interval t1; judging whether the motor is stable within the time interval t1 or not according to the torque estimation value; if so, calculating a torque dynamic threshold value Tth in a steady state; and comparing the TM with the Tth, and judging whether the anti-pinch function is started or not. According to the method, the motor torques under different tail gate loads of the electric vehicle are dynamically estimated through the steady-state Kalman filtering algorithm, and then the torque threshold value is dynamically adjusted, so that the anti-pinch control reliability is improved, and anti-pinch misjudgment is avoided.

This invention discloses a dual-drum adjustable-speed submarine cable laying and recovery winch and its usage method, including a base, a drum winch, a power system, and a clamping system. The base includes a working deck and a support frame. The working deck has circular holes and circular grooves. The support frame is mounted on the working deck. Rollers and cylindrical rollers are evenly distributed circumferentially within the circular grooves of both the working deck and the support frame. The drum winch includes an upper drum and a lower drum, which are rotatably connected in the circular grooves. The power system includes an upper motor and a lower motor, connected to both the upper and lower drums. The clamping system includes elastic clamps and electromagnet boxes. The elastic clamps are connected to the side walls of the upper and lower drums. Each elastic clamp has two electromagnet boxes at its end. This invention enables safe and efficient recovery of submarine cables, effectively protects the normal sections of the cable, and further saves space and cost.

This invention provides a motor control method, a motor control device, a readable storage medium, and a motor. The motor control method includes: setting a set speed and a set direction of rotation for the motor; acquiring the rotor position, operating speed, and operating direction of the motor while it is running; acquiring a first input value for the set speed and a second input value for the operating speed based on the operating direction, operating speed, set speed, and set direction of rotation; acquiring a target current based on the first and second input values; acquiring the actual current of the motor; acquiring a first control value based on the target current and the actual current; acquiring the chopping direction and duty cycle of the three-phase inverter bridge based on the first control value; acquiring the energizing phase sequence of the three-phase inverter bridge based on the operating direction of rotation; and controlling the motor operation using the three-phase inverter bridge based on the chopping direction, duty cycle, rotor position, and energizing phase sequence.

The embodiment of the utility model provides a motor control circuit and driving equipment. The motor control circuit comprises a controlled motor; the signal control module is used for sending an instruction signal, and the instruction signal is used for controlling the running state of the controlled motor; one end of each state control module is connected with a three-phase alternating current power supply for supplying power to the controlled motor, the other end of each state control module is connected with the signal control module, and each state control module is used for receiving the instruction signal and determining the started state control module according to the instruction signal; according to the started state control module, the controlled motor is controlled to operate according to the operation state indicated by the instruction signal; wherein the plurality of state control modules comprise a shared state control module, the shared state control module is kept open when the operation state of the controlled motor is changed, and the phase port of the controlled motor which correspondingly supplies power is not changed. By introducing a plurality of state control modules, the circuit structure is simpler, and the application range is wider.

The present invention relates to a pergola structure (100) comprising a frame (110), flat or inclined, defining a top opening (12), a covering element (10), such as a sheet, adapted to be displaced between a retracted position, wherein it leaves said top opening (12) essentially free, and an extended position, wherein it essentially covers said top opening (12), being superimposed thereto, and a drive and control unit (2, 2', 2'') for the motor-driven displacement of said covering element (10), said unit (2, 2', 2'') comprising at least a first electric motor (26) which can be powered to the mains voltage and comprising at least a first winding (AV1) and a second winding (AV2), said first motor (26) being adapted to be operatively associated with said covering element (10) to displace it between said retracted position and said extended position, and a first microcontroller (21) connected to said first motor (26) to determine the operating modes thereof. Said unit (2, 2', 2'') also comprises first detection means (24) associated with said first motor (26) and configured to detect, at the start of the first motor (26) determined by an input signal provided to said first microcontroller (21), a first signal (41) related to the supply current of the first winding (AV1) of the first motor (26) and a second signal (42) related to the supply current of the second winding (AV2) of the first motor (26), said first microcontroller (21) being adapted to interrupt the power supply to the first motor (26) upon detecting a phase shift variation (ΔB) between said first and said second signals (41, 42) greater than a reference value (X) set so as the interruption of the supply of said first motor (26) is performed when said covering element (10) reaches an extended and tensioned position. The present invention further relates to a method for the motor-driven displacement of a movable covering element (10) of a pergola structure (100) operated through a drive and control unit (2, 2', 2'') for automatically arranging said covering element (10) in an extended and properly tensioned position.

The present invention discloses an air-cooled heat dissipation structure for a frequency converter and a control method for self-cleaning the frequency converter's air duct. The frequency converter includes a housing and a control circuit, the control circuit including a controller. The housing includes a cooling air duct, a radiator is provided in the cooling air duct, a fan is installed at one end of the cooling air duct's air outlet, and an air inlet window is installed at one end of the cooling air duct's air inlet. The fan is a bidirectional fan. The control circuit includes a fan forward and reverse drive circuit, a motor of the bidirectional fan is connected to the fan forward and reverse drive circuit, and a control terminal of the fan forward and reverse drive circuit is connected to the controller. The present invention can self-clean the cooling air duct by controlling the fan's reverse rotation, eliminating the need for a separate fan. The frequency converter is compact and low-cost.

The present application relates to the technical field of terminals, and in particular to a dual-motor control apparatus, a control method and a related device. A motor driving chip in the apparatus is separately coupled with a control chip and a first motor, and is coupled with a second motor by means of a first channel and a second channel of a signal selector; the control chip is coupled with the signal selector; the control chip is used for sending a control signal to the motor driving chip and sending a selection signal to the signal selector; the motor driving chip is used for receiving and responding to the control signal to send a first driving signal to the first motor and the signal selector; the signal selector is used for receiving the selection signal and the first driving signal, and sending a second driving signal to the second motor by means of a target channel; and the first motor is configured to rotate along the direction driven by the first driving signal; and the second motor is configured to rotate along the direction driven by the second driving signal. Embodiments of the present application can reduce costs and improve the interpupillary distance adjusting effect.

The invention discloses a push rod limiting circuit, a push rod limiting method, a push rod device and an aerostat, and relates to the technical field of push rod limiting. A first solid-state relay and a second solid-state relay of a solid-state relay control module are each provided with a control end and a controlled access; a first limit switch of the limit switch module is connected in series in a loop between the rectification power supply module and the control end of the first solid-state relay, and a second limit switch is connected in series in a loop between the rectification power supply module and the control end of the second solid-state relay; the PWM driving module is used for receiving PWM power supply and selectively supplying power to the push rod motor through a controlled access of the first solid-state relay and the second solid-state relay so as to control forward and reverse rotation and speed regulation of the push rod motor; according to the push rod limiting circuit, contactless switching of the solid-state relay is combined with PWM speed regulation, power supply of the motor is cut off instantaneously at the limiting position, meanwhile, mechanical abrasion, contact oxidation and electromagnetic interference are avoided, and long-service-life and high-reliability limiting under the high-altitude severe environment is achieved.

The invention provides a motor driving device for generating sampling resistors based on lead bonding, a motor driving circuit comprises a driving unit U1, a motor interface unit, a first switch assembly, a second switch assembly, a first sampling resistor Rs1 and a second sampling resistor Rs2, and the first sampling resistor Rs1 and the second sampling resistor Rs2 are generated by a metal wire structure in a lead bonding mode. The first switch assembly and the first sampling resistor Rs1 form a first current path, the second switch assembly and the second sampling resistor Rs2 form a second current path, and the motor interface unit is communicated with the first current path and the second current path; when the first switch assembly is switched on under the control of the driving unit U1, current flows through the first current path, and the motor rotates in the first direction. When the second switch assembly is switched on under the control of the driving unit U1, the current flows through the second current path, and the motor rotates in the direction opposite to the first direction.

According to the electronic switch used for controlling the slot control motor, one end of a box body is provided with a main power supply input end, the other end of the box body is provided with a main power supply output end, a U-phase power supply, a V-phase power supply and a W-phase power supply in the main power supply input end are respectively connected with a main loop, and meanwhile, safety devices are arranged on the U-phase power supply and the V-phase power supply; the main loop is provided with four alternating current reversing switches used for being connected with a slot control motor, the main loop is connected with a voltage detector and a current detector, the voltage detector and the current detector are respectively connected with a data processor, the data processor is connected with a controller, and the controller is connected with an optoelectronic isolator, a state indicating lamp, a thyristor and a control input end. The invention has the characteristics of long service life, large controllable power, small volume and no mechanical wear and arc corrosion risk.

A method for manufacturing a power inverter may include determining several electrical properties of both a first and a second power switch chip. These several electrical properties include at least a conduction loss and a switching loss. Furthermore, the method may include manufacturing the power inverter at least partially using both the first and second power switch chips based on the several electrical properties of both.

The invention discloses a multi-position operation motor control circuit and a motor vehicle, and is applied to the field of motor design. Wherein N sets of combination switches are included, and each combination switch comprises two single-pole double-throw switches; the fixed ends of the two single-pole double-throw switches in the first set of combined switch are respectively connected with the two ends of the motor; the fixed ends of the two single-pole double-throw switches in the Xth set of combination switch are respectively connected with the normally closed ends of the two single-pole double-throw switches in the (X-1) th set of combination switch; the normally closed ends of the two single-pole double-throw switches in the Nth set of combination switch are connected and are connected with the detection control circuit; the normally open ends of the two single-pole double-throw switches in each combined switch are connected and are connected with a first power supply; and when the fixed end of any single-pole double-throw switch and the corresponding normally open end are closed, the corresponding combined switch and the other sets of combined switches form a loop. According to the invention, motor control of multi-position operation is realized through N sets of combinations, the circuit structure is simple, the operation is simple, and the cost is low.

The invention provides a control method and device of a motor and automatic cooking equipment, and relates to the technical field of intelligent control, and the method comprises the steps: responding to the starting of the motor, and controlling the power end of the motor to rotate under preset operation parameters; if it is monitored that the operation parameters exceed the preset parameter threshold value, a self-recovery mode of the motor is started; in the self-recovery mode, the motor is controlled to execute a self-recovery rotation strategy until it is monitored that the operation parameters meet the preset parameter threshold value, the self-recovery mode is quitted, and the motor is controlled to rotate under the preset operation parameters; according to the motor control method and device and the automatic cooking equipment provided by the invention, the self-recovery rotation strategy comprises the step of controlling the power end of the motor to alternately rotate according to the first direction and the second direction which are configured in advance so as to try to recover the rotation of the motor to normal work, so that the motor is prevented from being stuck, the self-recovery efficiency of the stuck motor is effectively improved, and the user experience is improved. And the use experience of the user is improved.

The invention provides a permanent magnet synchronous motor rapid direction response control device based on position prediction and an implementation strategy, belongs to the technical field of permanent magnet synchronous motor control, and aims to solve the problems that a traditional control scheme is lagged in response, the precision is easily interfered by working conditions, and the fault tolerance is insufficient. The device comprises a position / current acquisition unit, a position prediction calculation unit, a speed calculation unit, a fast direction response control unit, a PWM generation unit, a driving unit and a fault diagnosis unit, and cooperation of signal acquisition, prediction calculation, control generation and driving feedback is realized through a closed-loop link. According to the method, optimal control is carried out through position prediction, feed-forward compensation, load adaptive weight adjustment and fault dynamic correction. The method can improve the direction response speed and stability of the motor, enhances the control precision under different working conditions, optimizes the resource utilization rate, improves the fault tolerance of the system, and is suitable for industrial servo, precision transmission and other scenes.

A method of detecting forward and reverse connection of a three-phase motor is disclosed, including: turning on a first solid-state switch pair and a second solid-state switch pair into conduction for a predetermined period of time so that current can flow between a power supply and the three-phase motor; detecting output current of a solid-state motor starter; and determining the forward and reverse connection state of the three-phase motor based on the output current of the solid-state motor starter, in a case that currents exist at a first output terminal and a second output terminal, it is determined that the three-phase motor is in the forward connection state, and in a case that currents exist at the first output terminal and a third output terminal, it is determined that the three-phase motor is in the reverse connection state. Furthermore, a solid-state motor starter is disclosed.