28results about "Multiple dynamo-motor starters" patented technology

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 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.

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.

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 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.

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 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 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.

The invention discloses an electric tool. The electric tool comprises a power assembly, a first operation piece and a second operation piece which execute different functions, and a control device connected to the first operation piece and the second operation piece. The control device is configured to control the first function and the second function to be executed or allowed to be executed when the two operating parts are both in a triggered state in a first working mode; when the second operation piece is released and the first operation piece is continuously in the trigger state, the first function and the second function are controlled to keep an execution state or an execution permitting state; after the first working mode is switched to the second working mode, when the two operating parts are both in the trigger state, the first function and the second function are controlled to be executed or allowed to be executed; and when the first operation piece is released and the second operation piece is continuously in the trigger state, the first function and the second function are controlled to keep an execution state or an execution permitting state, so that different use habits of people with left handicapped and right handicapped are met.

The application discloses an electric tool and a control method thereof. The electric tool comprises a functional part, a motor assembly comprising a first motor and a second motor, at least one of the first motor and the second motor driving the functional part to work, and a power supply device connected with the motor assembly and supplying power for at least the motor assembly. There is a transmission relationship between the first motor and the second motor, and the first motor drives the second motor to rotate when rotating. 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 counter electromotive force of the second motor after the first motor starts. The scheme can effectively improve the starting success rate of the motor of the electric tool and ensure the smooth work of the tool.

The present application relates to motor control technology field, disclose a kind of three-phase asynchronous motor operation control management method and system, comprising the following steps: step 1, the number of encoder per revolution pulse, motor nameplate rated speed, acceleration time, coasting stop time, hot permission threshold, load shedding threshold, tripping threshold, start-stop token upper limit and expected spin direction are determined Maximum allowable acceleration time and minimum cooling lock time;Step 2, according to three-phase existence state, under-voltage state and time condition are judged to start admission;Step 3, execute pulse accumulation and spin direction comparison to generate start determination result, and deduct start-stop token number;Step 4, during operation, based on temperature detection calculation heat index, compared with each threshold, output continue to run, load shedding or shutdown instruction;Step 5, update heat index, when meeting unlocking condition, output unlocking result.The present application realizes the whole process safety management of three-phase asynchronous motor from start determination, operation regulation to shutdown unlocking.

The invention relates to the technical field of exhaust fan water resistance soft start methods, in particular to a method applied to water resistance soft start of a sintering main exhaust fan to change frequency soft start, raw water resistance soft start of the sintering main exhaust fan is changed into newly-added high-voltage frequency converter soft start, and a water resistance is reserved for standby application. Two motors of a large sintering machine operate at a power frequency after being started by two sets of water resistors originally, a frequency converter is additionally arranged after transformation, the power frequency is switched from 1 # to 50 Hz, and then the same operation is started by 2 #, so that one-key starting is realized. A multi-level frequency converter matched grid-connected cabinet, a newly added excitation cabinet and the like are used for main wiring, and switching is controlled by a PLC. Power frequency is switched after the frequency converter is softly started, a water resistor is used for starting when faults occur, and all steps are automatically executed. The problems that an existing sintering main exhaust fan is core equipment of an ironmaking plant, motor power is large, starting is difficult, in the beginning of the century, a water resistor is commonly used for starting, although the equipment is simple and convenient to maintain, starting current is large, starting cannot be conducted many times, a motor is prone to being damaged, and much inconvenience is brought are solved.

The utility model discloses a fan controller for an energy storage fire extinguishing system. The fan controller comprises a low-voltage circuit breaker 1, a terminal strip 2, a first relay 301, a second relay 302, a switching power supply 4, a start indicator lamp 5, a stop indicator lamp 6, a manual and automatic switching button 7 and a manual start knob 8. The fan controller can control the alternating-current fan motors and the direct-current fan motors respectively, and the control logic of the direct-current fan motors is that the motors continuously rotate reversely before being triggered, and the motors continuously rotate forwards after being triggered. In the manual mode, the fan motor can be started only by starting a manual opening knob on the cabinet door; in the automatic mode, the fan motor can be started and stopped through an external dry contact signal. The design improves the safety and convenience of operation, and is suitable for an energy storage fire extinguishing system which needs a plurality of fan motors to work cooperatively.

This invention relates to a multi-level master-slave architecture frequency converter based on a clock source synchronous control method and system, comprising multiple six-phase motors driving the same load and mechanically connected via a long shaft system. Each of the six-phase motors is driven by a master-slave frequency converter. The master frequency converter of one of the six-phase motors serves as the first-level control link, the master frequency converters of all six-phase motors serve as the second-level control link, and the current control loops and execution units of all frequency converters serve as the third-level control link. The master control systems of all frequency converters are connected to a system clock source serving as a unified time reference via a high-speed communication bus. The three-level master-slave architecture control achieves time-division calibration of control command calculation, distribution, and application. This method is suitable for applications where multiple frequency converters and multiple motors collaboratively drive ultra-high power long shaft loads, effectively compensating for control asynchrony problems caused by communication delays, and significantly improving the speed synchronization, torque balance capability, and operational reliability of the multi-motor drive system.

Disclosed in the present application is an electric tool. The electric tool comprises: a power assembly; a first operating member and a second operating member, which execute different functions; and a control apparatus, which is connected to the first operating member and the second operating member. The control apparatus is configured to: in a first operating mode, when the operating members are both in a triggered state, control the execution or allowed execution of a first function and a second function; when the second operating member is released and the first operating member is continuously in the triggered state, control the first function and the second function to maintain an executed or execution-allowed state; after switching to a second operating mode, when the operating members are both in the triggered state, control the execution or allowed execution of the first function and the second function; and when the first operating member is released and the second operating member is continuously in the triggered state, control the first function and the second function to maintain the executed or execution-allowed state. Therefore, different usage habits of left-handed users and right-handed users are satisfied.

The invention relates to a clock source-based synchronous control method and system for a multi-level master-slave architecture frequency converter, and the system comprises a plurality of six-phase motors which drive the same load and are mechanically connected through a long shaft system, the six-phase motors are respectively driven by master and slave frequency converters, a master frequency converter of one of the six-phase motors is used as a first-level control link, and a slave frequency converter of the other six-phase motor is used as a second-level control link. Main frequency converters of all the six-phase motors are used as a second-level control link, current control rings and execution units of all the frequency converters are used as a third-level control link, and main control systems of all the frequency converters are respectively connected with a system clock source serving as a unified time reference through a high-speed communication bus; time-sharing calibration of calculation, distribution and application of control instructions is achieved through three-level master-slave architecture control, the method is suitable for occasions where multiple frequency converters and multiple motors cooperatively drive super-power long shafting loads, and the problem of control asynchronization caused by communication delay is effectively solved. And the rotating speed synchronism, the torque balance capability and the operation reliability of the multi-motor driving system are obviously improved.

The method for controlling a maneuvering device (2) to maneuver a screen (3) of an occulting home-automation system (1) between at least a first position and a second position comprises: a first actuator (5) equipped with a first electric motor (9), a torque detection device (19) and a position management module (27), a second actuator (6) equipped with a second electric motor (12), a torque detection device (26) and a position management module (28), and a winding shaft (7). The actuator and the second actuator are configured to drive the winding shaft. The method includes designating the first actuator as master actuator and the second actuator as slave actuator.

The invention relates to the technical field of ship comprehensive power systems, in particular to a control method and system for cooperative starting of multiple main propulsion motors of an electric propulsion ship, the propulsion demand power of the ship is obtained in real time, the actual total output power of operated motors is monitored, and a machine increasing instruction is generated by comparing the propulsion demand power with the actual total output power and combining the power margin of a current operation unit; responding to the instruction, starting a process of circularly scanning the standby motor in sequence, and synchronously checking whether each motor meets a starting permission condition or not during scanning; when a motor meeting all conditions is scanned for the first time, a starting instruction is sent to the motor, scanning is stopped immediately, and therefore it is ensured that only one healthy standby motor is started each time. The technical problems of power grid impact, faulty unit false starting and unintelligent and unreliable starting process which are possibly caused by lack of comprehensive judgment on the real-time state of the power grid and the equipment health degree during multi-machine starting 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.

To suppress influence on a power system by suppressing an increase of an activation power when starting a variable-speed increasing gear.SOLUTION: A variable-speed increasing gear comprises: an electrically-driven apparatus; a speed change gear; and a power supply part that supplies a power of a constant rated frequency supplied from an electric power source to the electrically-driven apparatus in the case where the electrically-driven apparatus is started. The electrically-driven apparatus includes: a rated dynamo-electric motor having a rated rotor rotating a rated input shaft of the speed change gear; and a variable-speed dynamo-electric motor which has a variable-speed rotor connected to a variable-speed input shaft of the speed change gear and functions as a dynamo-electric motor in a dynamo-electric motor mode while functioning as a power generator in a power generator mode. The power supply part is connected to the rated dynamo-electric motor and the variable-speed dynamo-electric motor, and when the electrically-driven apparatus is started, the power generated in the variable-speed dynamo-electric motor which becomes the power generator mode is supplied to the rated dynamo-electric motor after an activation power is supplied to the rated dynamo-electric motor and the variable-speed dynamo-electric motor.SELECTED DRAWING: Figure 1

The utility model relates to a drilling machine grid power high-voltage room with an insulation online monitoring system. The room comprises a room body; the ring main unit, the main transformer, the auxiliary transformer, the first feed cabinet, the second feed cabinet and the soft starter are all arranged in the room body; the input end of the ring main unit is suitable for accessing high-voltage electricity, the output end of the ring main unit is electrically connected with the input end of the main transformer, and the output end of the main transformer is electrically connected with the bus and suitable for converting the high-voltage electricity into 600V alternating-current voltage and outputting the 600V alternating-current voltage to the bus; the input end of a feed cabinet is electrically connected with the bus; the output end of the first feed cabinet is suitable for outputting 600V alternating current voltage; the input end of the second feed cabinet is electrically connected with the bus through the auxiliary transformer, and the output end of the second feed cabinet is electrically connected with the input end of the soft starter and is suitable for transmitting 400V AC voltage to the soft starter; the output end of the soft starter is electrically connected with the more than two motors and is suitable for providing working voltage for the more than two motors.

The invention discloses a soft start redundancy control system and method for an auxiliary motor of a petroleum drilling machine. The control system comprises a main incoming line circuit breaker QF, bypass incoming line circuit breakers 1QF-6QF, an AC400V busbar, soft starters A1-A2, incoming line contactors KM1-KM2, a bus coupler contactor KM3, soft start loop contactors 1KM1-6KM1, bypass contactors 1KM2-6KM2, thermal relays FR1-FR6, current transformers TA1-TA6, motors M1-M6, relays KA1-KA17, a control module and a PLC (Programmable Logic Controller). By adopting a multi-level redundancy architecture, the backup, replacement and redundancy control functions of motor starting are realized, reliable operation conditions are provided for well site equipment, the availability and reliability of a drilling system and the fault-tolerant capability of the system are improved, the system can still operate continuously and stably when a part of components are invalid or fail, and the reliability of the drilling system is improved. Therefore, the system can better complete the borne work task, the outage rate is reduced, the load balancing is realized, and the system performance is improved.

The invention relates to a digital control system based on an integrated board and a design method of the control system. The system comprises a PLC board card, a frequency converter board card, a touch screen and a motor. The PLC board card and the frequency converter board card are fixedly installed on the electric fitting board. The PLC board card is provided with a board card interface connected with an external sensor and an instrument; the PLC board card is a PLC board card which is used for collecting external sensors and controlling the starting, stopping and rotating speed of a motor by regulating and controlling each frequency converter in real time so as to realize constant-pressure water supply and some abnormal protection; all external signals need to pass through the PLC board card, and meanwhile, the PLC board card communicates with the frequency converter board through an RS485 bus, reads the working state of the frequency converter board, and controls starting, stopping and debugging of the frequency converter board card so as to control the motor; the touch screen is connected with the PLC board card through a bus, and the touch screen and the control power supply are provided by the PLC board card. The device is low in cost, space-saving, high in wiring efficiency, convenient to overhaul and high in environment adaptability.

The present invention belongs to the technical field of food processing, and particularly relates to an automatic tsamba production process and equipment, the automatic tsamba production process comprises: a stirring mechanism used for uniformly stirring flour and water and pushing the stirred dough to a dough cutting mechanism; the dough cutting mechanism is used for adjusting the size of the dough and making the dough with accurate gram weight and uniform shape; the forming mechanism is used for making the dough into zanba in various shapes; and the automatic system is used for realizing automatic stirring, flour supply, dough dividing and forming of the equipment. Compared with existing equipment, automatic production of tsamba can be achieved, and the production efficiency is improved; flour and water can be quickly and uniformly stirred, and the flavor and taste of the tsamba can be ensured; the weight of the dough can be accurately controlled, and the standard process of batch production is met; the size of the dough can be adjusted according to requirements, and zanba of different sizes can be produced; the special shape of the tsamba can be rapidly and stably manufactured, and demolding, waste recycling and secondary manual processing are not needed.

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.