74results about "Multiple dynamo-motor starters" patented technology

The invention provides a multi-motor synchronous control method, a multi-motor synchronous control system, a non-transient readable storage medium and a seat system. The multi-motor synchronous control method comprises the following steps: starting a plurality of motors based on a request of a main controller, the plurality of motors including a first motor and at least one second motor, the first motor and the at least one second motor being respectively controlled by a first motor controller and at least one second motor controller which are in communication connection with each other; acquiring first position information of the first motor and second position information of the second motor; and adjusting the running speed of the first motor or the second motor based on the first position information and the second position information. According to the invention, the real-time position information of the first motor and the second motor is obtained, and the operation speeds of the plurality of motors are adjusted through the respective motor controllers of the first motor and the second motor, so that the independent and synchronous operation of the plurality of motors is realized.

The invention relates to the technical field of motor control, and discloses a three-phase asynchronous motor operation control management method and system, and the method comprises the following steps: 1, obtaining the pulse number per revolution of an encoder, the rated rotating speed of a motor nameplate, the acceleration time, the sliding stalling time, a thermal permission threshold, a load shedding threshold, a jump gate threshold, the upper limit of a start-stop token, and an expected rotation direction; determining the maximum allowable acceleration time and the minimum cooling locking time; 2, starting access judgment is carried out according to the three-phase existence state, the under-voltage state and the time condition; 3, pulse accumulation and rotation direction comparison are executed to generate a start judgment result, and the number of start-stop tokens is deducted; 4, calculating a thermal index based on temperature detection during operation, comparing the thermal index with each threshold, and outputting an operation continuing, load shedding or shutdown instruction; and 5, updating the thermal index, and outputting an unlocking result when an unlocking condition is met. According to the invention, safe management of the whole process of starting determination, operation regulation and control and shutdown unlocking of the three-phase asynchronous motor is realized.

An example aircraft includes a parallel propulsion unit, the parallel propulsion unit comprising: a propulsor configured to provide forward propulsion of the aircraft; a gas turbine engine configured to drive the propulsor; an electrical machine configured to generate, for output via one or more electrical busses, electrical energy using mechanical energy derived from the gas turbine engine; and a power sharing module configured to control a ratio of the mechanical energy used to drive the propulsor and used to generate electrical energy; and a plurality of series propulsion units, each series propulsion unit comprising a respective propulsor of a plurality of propulsors that are configured to provide vertical propulsion of the aircraft and a respective electrical machine of a plurality of electrical machines, each respective electrical machine configured to drive a respective propulsor of the plurality of propulsors using electrical energy received from one or more electrical busses.

A method and system for operating a hybrid propulsion system, includes controllably providing a first power to a first bus and a first inverter, electrically coupling a first motor with a second inverter by way of a second bus, operably converting, by the second inverter, the first power received by the first inverter to a starting power adapted for starting the first motor, and increasing, by the second inverter, the starting power to match the first power received.

The invention discloses an electric tool and a control method thereof. The electric tool includes: a functional member; the motor assembly comprises a first motor and a second motor, and at least one of the first motor and the second motor drives the functional part to work; the power supply device is connected with the motor assembly and at least supplies power to the motor assembly; a transmission relation exists between the first motor and the second motor, and when the first motor rotates, the second motor is driven to rotate. The electric tool further comprises a controller connected with the motor assembly, and the controller is configured to control the second motor to start based on the back electromotive force of the second motor after the first motor is started; the scheme can effectively improve the starting success rate of the motor of the electric tool and guarantee smooth work of the tool.

A method is provided for processing an object with the aid of a planar drive system. The planar drive system comprises at least one stator assembly, each having a plurality of coil groups for generating a stator magnetic field, a stator surface above the stator assembly, and at least one rotor comprising a plurality of magnet units for generating a rotor magnetic field. The planar drive system further comprises at least one rotational position, where the rotor is rotatable about a rotational axis perpendicular to the stator surface in the rotational position. The rotational position is determined based on a point of contact of four stator assemblies. The method comprises energizing the coil groups in such a way that the rotor moves to the rotational position, energizing the coil groups in such a way that the rotor rotates, and processing of the object with the aid of the rotor rotation.

The invention relates to the technical field of pumped storage power stations, and particularly discloses an electrical main wiring structure and a starting method of a variable-speed and constant-speed mixed pumped storage unit. The electrical main wiring structure comprises an alternating excitation and static variable-frequency starting composite system, a variable-speed generator motor and a constant-speed generator motor; by arranging the alternating excitation and static frequency conversion starting composite system, the voltage and current of the rotor are accurately controlled, active and reactive power flexible adjustment can be achieved under the electric working condition, and the operation efficiency and the operation stability of the unit can be effectively improved under the water turbine working condition. The constant-speed unit is started through an alternating-current excitation and static variable-frequency starting compound system, and a static variable-frequency starting device depended on starting of a traditional constant-speed unit is replaced. Compared with a hybrid pumped storage unit, a variable-speed unit is independently provided with an alternating-current excitation system, and a constant-speed unit is independently provided with a variable-frequency starting device, so that the variable-frequency starting device is omitted, and the equipment investment cost is greatly reduced; and the overall occupied space of the equipment is reduced.

The utility model provides a pan-tilt driving motor starting capacitor board. The pan-tilt driving motor starting capacitor board comprises a switch interface module, an arc extinguishing module, a starting capacitor module and a network and power supply transmission interface module which are integrally configured on a circuit board, the arc extinguishing module is respectively connected with a motor limit switch of a holder driving motor, the camera device and the starting capacitor module through the switch interface module, and the network and power supply transmission interface module is configured to supply power to the camera device by external voltage and input network signals; in response to an electric energy signal sent to the pan-tilt driving motor by the camera device, the pan-tilt driving motor is controlled to act through the arc extinguishing module and the starting capacitor module; and in response to the moment that the contact of the trigger generator limit switch is disconnected, the arc extinguishing module absorbs transient voltage generated at the moment that the contact is disconnected so as to control the pan-tilt driving motor to stop acting. According to the application, the electric arc and sparking conditions generated by the position of the contact point in the limit switch during action in an alternating current power supply environment can be effectively inhibited, the contact point is effectively protected, the reliability is improved, the problem of control failure of the pan-tilt is avoided, and long-term stable operation of the pan-tilt is ensured.

The invention provides a motor rapid deployment method based on a CAN bus, and belongs to the field of information data and electrical automation. The gateway and the CAN bus motor form a deployment system, and the gateway uniformly and dynamically implements CAN ID distribution of the CAN bus motor. Comprising the following steps: step (1), a gateway and a CAN bus motor are located in the same CAN communication network during deployment; the gateway broadcasts the message, and all motors enter a configuration mode; (2) for CAN bus motors with normal communication, whether motor bodies rotate or not is detected one by one in sequence; if yes, entering a CAN ID request state, sending a message to a gateway by the motor based on a default motor CAN ID, and requesting to distribute the CAN ID; (3) after receiving the request message sent by the motor, the gateway distributes a CAN ID for the first motor; step (4), turning back to the step (2) to continue execution until all CAN bus motors are distributed with CAN IDs, and turning to the following step (5); and step (5), pressing down a gateway key, and ending the configuration of the gateway.

The invention relates to the technical field of relay protection, in particular to a multi-motor black-start power coordination method and system based on hybrid energy storage. Initializing a multi-motor black-start system based on supercapacitor energy storage and an uninterruptible power supply; after the system is initialized, the black-start process of the motor 1 is carried out, and stable operation monitoring is carried out; when the motor 1 operates stably, the black start process of the motor 2 is carried out. According to the multi-motor black-start optimization method and system based on the hybrid energy storage master-slave control mode, an uninterruptible power supply serves as a master control unit to provide voltage support, and energy stored by a supercapacitor serves as a slave control unit to quickly supplement starting current, so that organic combination of a voltage source and a current source is realized; meanwhile, UPS output amplitude limiting is dynamically adjusted according to initial starting characteristics of motors with different powers, sequential controllable starting of multiple motors is achieved by adopting a sectional starting process, and the problems that in a traditional scheme, UPS capacity configuration is too large, and the controllability of the starting process is poor are effectively solved.

There is provided a system and a method of controlling two or more electrical fans, the system comprising, a first electrical fan having blades configured to rotate upon provision of electrical power; a second electrical fan having blades configured to rotate upon provision of electrical power; and a controller for controlling the provision of electrical power to the first electrical fan and the second electrical fan, wherein the provision of electrical power to the second electrical fan is configured to occur at a time period after the provision of electrical power to the first electrical fan to initiate rotation of the blades of the first electrical fan.

Enhanced network power factor corrective designs are presented that can use corrective devices that achieve long-term, operationally stable mechanical work. Embodiments can utilize reverse-winding induction motor designs with engineerable parameters and configurations for the reverse winding (13) in systems and through methods where an inductive motor (1) can present a current that leads voltage and a leading power factor (16) to correct other existing induction motors (8) in an initial network (9) or be optimized for a particular application. Designs also present a power factor correction that can present a variable correction without altering the character or physical capacitive value of an electrical correction component. Individual induction motors that have leading current and a leading power factor (16) can be provided to improve reverse winding induction motors. Progressive start controls (23) can also be used in a manner that limits inrush current to operational levels with passive current establishment control where reverse winding (13) effects can be used and perhaps even delayed to passively limit and even effect a current decrease while rotational acceleration continues after initial start transition.

Provided are a power tool, a cutting tool, and a circular saw. The power tool includes a first electric motor and a second electric motor, where a first drive shaft and a second drive shaft are arranged along the radial direction of the first drive shaft; a power transmission mechanism for transmitting power of at least one of the first electric motor and the second electric motor to an output shaft; and an accommodation housing, where when orthographic projections are observed along the extension direction of the output shaft, along the direction of a line connecting the orthographic projection of the first axis and the orthographic projection of the second axis, the ratio of the outer dimension Lc of the accommodation housing to the outer diameter dimension D of any one of the electric motors is greater than or equal to 1.1. The two electric motors mate with each other to drive the power tool.

This invention provides a multi-motor starter for a gate hoist testing platform, relating to the technical field of gate hoist testing platforms. It includes: a first resistance box, a second resistance box, and a third resistance box; the first resistance box is connected in series with the motor rotor of a 320t or 250t hoist; the second resistance box is connected in series with the motor rotor of a 160t-63t hoist; and the third resistance box is connected in series with the motor rotor of a 50t-25t hoist. The system obtains the target specifications of the gate hoist currently under test; connects to the target resistance box matching the currently under test; generates control commands corresponding to the currently under test gate hoist based on the target specifications; and controls the operation of each contactor corresponding to the target resistance box. This invention significantly reduces the number of resistance boxes, simplifies wiring and control complexity, and improves control reliability.

The invention discloses a WESP feedforward control method and system considering frequency conversion and starting number of slurry pumps of a desulfurizing tower, and belongs to the technical field of automatic control of environmental protection islands of thermal generator sets. According to the method, modeling is carried out on slurry pump frequency and number step test data, a characteristic model between the slurry pump frequency and the concentration of smoke at an outlet of a desulfurizing tower is established, and gain, inertia time and lag time parameters are identified by adopting an immune genetic algorithm. And constructing a frequency feed-forward channel and a number feed-forward channel based on Pade approximation and a low-pass filter, and superposing the feed-forward compensation quantity and the PID feedback control quantity of the wet electric dust remover to generate the operation control quantity of the wet electric dust remover power supply. The control system comprises a slurry pump working condition acquisition module, a smoke dust concentration acquisition module, a model storage and calling module, a feed-forward and feedback operation module and a control quantity synthesis execution module, rapid response to the operation working condition of the slurry pump of the desulfurization tower is achieved, the auxiliary dust removal capacity of the desulfurization tower is fully utilized, and automatic, efficient and energy-saving control over the wet-type electric dust remover is achieved.

The invention discloses a dual-motor voltage-reduction starting system of an electric control excavator and a failure protection method of the dual-motor voltage-reduction starting system. The system comprises a wire inlet cabinet and a starting cabinet, wherein a signal measurement unit, a motor power supply unit, a state monitoring unit and a logic control unit are integrated in the starting cabinet. According to the system, two motors are sequentially subjected to voltage reduction starting by adopting time-sharing control logic through a set of shared starting transformer, so that starting current impact is reduced. The state monitoring unit integrates a fuse with a self-checking function and a vacuum contactor state feedback circuit, and can diagnose the health state of the loop in real time. The logic control unit executes motor start-stop control based on the signals, and triggers a multi-stage failure protection mechanism including a breaking contactor and a tripping incoming circuit breaker or switching to standby start logic when faults such as overvoltage, overcurrent, short circuit, contact adhesion and the like occur, so that the reliability and the safety of the system are remarkably improved.

The operation system of the mechanical arm of the present application comprises a control device, a plurality of shaft driving control devices and a brake release monitoring device. The control device is used to generate an operation instruction. The shaft driving control devices are coupled to the control device. Each shaft driving control device comprises a motor and a driver. The drivers of the plurality of shaft driving control devices receive the operation instruction to generate corresponding brake release signals. The brake release signals are used to release a brake state of the motors of the corresponding shaft driving control devices. The brake release monitoring device is coupled to the control device and the shaft driving control devices, and comprises a plurality of monitoring circuits. When one of the plurality of monitoring circuits does not receive the corresponding brake release signal, the brake release monitoring device informs the control device that the operation instruction is not allowed to be executed.

The invention relates to a starting control method, system and device for a multi-motor driven by a single inverter and a medium, and the method comprises the steps: injecting a high-frequency square wave signal into each motor connected with the single inverter in a motor starting stage, and obtaining a response signal of each motor; performing signal separation based on the response signal of each motor to obtain a high-frequency response signal of each motor; performing phase-locked loop per unit processing according to the high-frequency response signal of each motor to obtain an initial position of a rotor of each motor; determining a target rotor position difference according to the rotor initial position of each motor; and based on the target rotor position difference, performing rotor position adjustment of each motor according to a preset grading adjustment strategy, so as to control each motor to be synchronously started when the rotor position of each motor is consistent. Therefore, the problem of low reliability of multi-motor synchronous starting caused by low rotor position identification precision and complex system structure in the prior art is solved.

The present invention relates to a soft start control method for multiple motors, and an inverter using same. The inverter according to an embodiment of the present invention is an inverter which converts supplied alternating current into three-phase ((U, V, W)) alternating current and outputs same, the inverter comprising: 2n relays which operate on / off of respective output switches; and a control unit which controls the respective relays to operate the on / off of the respective output switches so as to control respective motors to be connected to the three phases ((U, V, W)) of the inverter or connected to three phases ((R, S, T)) of an alternating current power source unit.

The present application relates to the field of high-power speed regulation, in particular to a control method for constant / super-torque starting and running of a mechanical-electrical integrated planetary speed regulation device, which is suitable for the field of industrial drive speed regulation, and especially suitable for driving devices such as compressors in petrochemical and natural gas industries.In the starting process, the load is proportionally shared by the speed regulation motor and the main drive motor, and according to the capacity of the two-quadrant frequency converter configured for the main drive motor, the output torque of the sun gear can be kept constant, rated, or even exceed the rated torque.The main drive motor and the speed regulation motor keep the constant torque mode, so that the output of the device also keeps the constant torque mode.Under normal circumstances, the torque of pumps and fans is in a quadratic relationship with the speed, and the torque of compressors in petrochemical industries is between a linear relationship and a quadratic relationship with the speed, both of which are less than the constant torque mode, so that the starting and running requirements can be met.

Enhanced network power factor corrective designs are presented that can use corrective devices that achieve long-term, operationally stable mechanical work. Embodiments can utilize reverse-winding induction motor designs with engineerable parameters and configurations for the reverse winding (13) in systems and through methods where an inductive motor (1) can present a current that leads voltage and a leading power factor (16) to correct other existing induction motors (8) in an initial network (9) or be optimized for a particular application. Designs also present a power factor correction that can present a variable correction without altering the character or physical capacitive value of an electrical correction component. Individual induction motors that have leading current and a leading power factor (16) can be provided to improve reverse winding induction motors. Progressive start controls (23) can also be used in a manner that limits inrush current to operational levels with passive current establishment control where reverse winding (13) effects can be used and perhaps even delayed to passively limit and even effect a current decrease while rotational acceleration continues after initial start transition.

The invention relates to the technical field of pumped storage power stations, and particularly discloses an electrical main wiring structure and a starting method of a variable-speed and constant-speed mixed pumped storage unit. The electrical main wiring structure comprises an alternating-current excitation system, a variable-speed generator motor and a constant-speed generator motor; by arranging the alternating current excitation system, compared with a constant-speed unit, the variable-speed unit is arranged to accurately control voltage and current of a rotor through the alternating current excitation system, flexible adjustment of active power and reactive power can be achieved under the electric working condition, and the operation efficiency and the operation stability of the unit can be effectively improved under the water turbine working condition. And the constant-speed unit is started through the alternating-current excitation system, and a static variable-frequency starting device which is depended on when a traditional constant-speed unit is started is directly replaced. Compared with a traditional combination scheme that a variable-speed unit is independently provided with an alternating-current excitation system and a constant-speed unit is independently provided with a variable-frequency starting device, on one hand, the high-cost variable-frequency starting device is omitted, and the equipment investment cost is greatly reduced; on the other hand, the overall occupied space of equipment is reduced, and the layout design of a power station is optimized.

The embodiment of the utility model provides an electrical control cabinet. A cabinet body of the electrical control cabinet comprises a containing cavity and an opening, and the opening is formed in one side of the cabinet body and communicated with the containing cavity. And the plurality of junction boxes are arranged in the accommodating cavity in parallel. The plurality of groups of motor starters are coupled to the cabinet body at the opening in a drawable manner, and each group of motor starters is electrically connected with a corresponding junction box in the plurality of junction boxes. The plurality of power supply modules are arranged in the accommodating cavity and are arranged corresponding to the plurality of junction boxes. The power supply input ends of the plurality of power supply modules are suitable for being electrically connected with an external power supply, and the first direct current output end and the second direct current output end of each power supply module are electrically connected with the corresponding junction box so as to supply power to the corresponding group of motor starters through the junction box. By means of the arrangement, the power module does not need to occupy the space in the motor starter, and the size of the motor starter can be reduced. In addition, each power supply module supplies power to one group of motor starters at the same time, so that the efficiency of the power supply module can be improved.

A system for driving electric machines of switching units, in particular for electrical power substations, comprising control units (1000, 1001, 1002, 1003, 1004, 1005...) for controlling said electric machines, comprising means for managing the priority of the electric machines in operation, so that only one electric machine is in operation at a time, said means having a first line (1010) and a second line (1020), the first line, called parallel line, carrying binary data comprising a first state and a second state, the first state representing the stop of all electric machines and the second state representing the operation of any electric machine, said units being connected in parallel to the parallel line, said parallel line being connected to means for preventing the start of the electric machine of each unit, the second line, called series line, said units (1001, 1002, 1003,...) being connected in series to the second line in an upstream / downstream chain, said series line constituting a means for inhibiting the operation of the electric machines downstream of any electric machine on detection of a signal for starting said any electric machine, the series line being connected to means (106A, 106B, 106C) for inhibiting the operation of the electric machine of each unit.

The invention relates to the technical field of vehicle control, and provides a fan control circuit, method and device. The control circuit comprises a direct-current converter used for converting a first preset direct-current voltage in the vehicle into a second preset direct-current voltage, and the second preset direct-current voltage is smaller than the first preset direct-current voltage; a first port of each fan is connected with the positive electrode end of the output end of the direct-current converter, a second port of each fan is connected with the negative electrode end of the output end of the direct-current converter, and a third port of each fan is correspondingly connected with the control signal output end of the vehicle control unit and is used for starting in stages according to control signals output by the vehicle control unit for heat dissipation. The fan can be started in stages, impact on a circuit is reduced while heat dissipation is achieved, in addition, the fan is started in stages, unnecessary energy waste can be reduced, and energy consumption is reduced.

The present application relates to a dual-motor control circuit, comprising: a power supply startup circuit for providing working electrical energy and starting the operation of the control signal operation circuit; a control signal operation circuit for calculating a first control signal and a second control signal according to the control instruction of the power supply startup circuit; the power supply startup circuit is connected to the control signal operation circuit; a first motor drive circuit for controlling the operation of a first motor according to the first control signal; the first motor drive circuit is connected to the control signal operation circuit; a second motor drive circuit for controlling the operation of a second motor according to the second control signal; the second motor drive circuit is connected to the control signal operation circuit. The dual-motor control circuit provided by the present application has a fast control response speed, stable operation, and smooth signal processing.

The utility model relates to the field, and discloses a compressed air energy storage synchronous motor starting and operation control protection system, which comprises at least two sets of starting and operation control protection subsystems. Each set of start and operation control protection subsystem comprises a plurality of circuit breakers, a frequency conversion section, a tie line, a start / speed regulation frequency converter, a frequency conversion loop and a power frequency loop; the frequency conversion loop comprises a circuit breaker, a starting / speed regulation frequency converter and a frequency conversion section; the power supply side of the frequency conversion loop is connected to the working section, and the output side is respectively connected with a plurality of compressor motors through the frequency conversion section; the frequency conversion sections of the two subsystems are connected through a connecting line and an interconnecting circuit breaker and are used for standby starting and debugging; the input side of the power frequency loop is connected with the low-voltage side of the transformer, and the output side is connected with the multiple compressor motors through the frequency conversion section. According to the system, the switching sequence is optimized, and the configuration of the starting / speed regulation frequency converter is simplified, so that one standby starting / speed regulation frequency converter starts a plurality of compressor motors.

The invention relates to a drive system with a three-phase motor (M1), with a single-phase motor (M2) and with a three-phase bridge which is designed to feed the three-phase motor (M1) and the single-phase motor (M2), wherein the drive system, preferably a control unit of the drive system, is designed to • operate the three-phase motor (M1) and the single-phase motor (M2) individually under full load or • operate the three-phase motor (M1) and the single-phase motor (M2) together, each under partial load.

The invention discloses a planetary variable-frequency speed regulation system of an electric feed pump and a soft start control method, and belongs to the technical field of feed pump start control. The invention aims to solve the problems of large mechanical impact and large current impact in the existing starting control method of the water feeding pump of the power station boiler water feeding system. The system comprises a main motor, an auxiliary motor, a planetary gear mechanism and a frequency converter, wherein the planetary gear mechanism comprises a sun gear, a planetary gear and a gear ring; an output shaft of the main motor is connected with the gear ring; the frequency converter is used for driving the auxiliary motor, an output shaft of the auxiliary motor is connected with the planet carrier, and the planet carrier is provided with the planet wheel. The sun gear is connected with an input shaft of the feed pump. Smooth and small-impact starting of the water feeding pump is achieved.

If a B system microcomputer (30b) is reset and reactivated while an A system microcomputer (30a) is operating normally, tasks of the A system microcomputer (30a) and tasks of the B system microcomputer (30b) can be synchronized. The B system microcomputer (30b) is reset when voltage applied to a battery (50) decreases and falls below an operation guarantee voltage. Thereafter, when the applied voltage becomes equal to or higher than the operation guarantee voltage and the B system microcomputer (30b) is activated, the B system microcomputer (30b) outputs a request signal for requesting a synchronization signal to the A system microcomputer (30a). The A system microcomputer (30a) outputs the synchronization signal synchronized with a periodic task. The B system microcomputer (30b) determines an execution timing of the periodic task based on the synchronization signal.