51results about "Dc motor starters" patented technology

A wireless communication system includes a transmitter, a plurality of passive substantially linear medium portions including one or more first portions and a second portion, one or more passive substantially nonlinear medium portions disposed proximate the substantially linear medium portions, and for each first portion, a dielectrically lossy or magnetically lossy first material disposed on the first portion. When the transmitter transmits first and second radio waves, the substantially linear and nonlinear medium portions receive the first and second radio waves and generate first and second signals propagating therein, where at least one intermodulation signal is generated in the one or more substantially nonlinear medium portions from the first and second signals, and the one or more first materials reduces the generation of the at least one intermodulation signal by at least 2 dB.

An electric work machine includes a motor, a drive switch, and a controller. The controller is configured to increase a magnitude of a voltage to be applied to the motor, based on the drive switch being turned on. The controller is configured to reduce the increase in the magnitude of the voltage to be applied, based on an actual rotational speed of the motor having reached a rotation threshold that has been set.

A startup control circuit includes a direct current (DC) conversion circuit, a main control unit, a first switch circuit and a second switch circuit. The first switch circuit is connected to the battery pack and the DC conversion circuit. The second switch circuit is connected to a battery pack, the DC conversion circuit, and a main control unit. The first switch circuit is configured to activate the DC conversion circuit to supply power to the second switch circuit and the main control unit after the first switch circuit is triggered. The second switch circuit outputs different voltage waveforms based on different timing sequences of currents flowing from the battery pack and the DC conversion circuit to the second switch circuit. The main control unit is configured to output a first drive command when receiving a first voltage waveform.

The embodiment of the application provides a controller for controlling a fan, comprising a rectifier unit, a switching power supply conversion unit, a delay unit, a fan starting control unit and a fan interface; the output end of the rectifier unit is connected with the input end of the switching power supply conversion unit, the switching power supply conversion unit converts the bus voltage output by the rectifier unit to generate the first direct current voltage required by the delay unit; the switching power supply conversion unit has an overvoltage protection function; the delay unit is connected to the first output end of the switching power supply conversion unit and receives the first direct current voltage; the fan starting control unit comprises a controllable switch, the control end of the controllable switch is connected with the delay unit, when the delay time set by the delay unit is reached, the delay unit controls the controllable switch to be closed; the first end of the controllable switch is connected with the output of the rectifier unit, and the second end of the controllable switch is connected with the fan interface. The controller can realize overvoltage protection of the fan.

This document relates to a method and an electronic device including a flexible display. According to an embodiment, the electronic device can include a plurality of batteries, a flexible display, a motor for driving at least a portion of the flexible display to move, a motor driving circuit connected to the motor, a switching circuit including a plurality of switches for switching between a first state in which the plurality of batteries are connected in series and a second state in which the plurality of batteries are connected in parallel, a memory for storing instructions, and a processor. According to an embodiment, the instructions, when executed by the processor, can cause the electronic device to identify an event for switching an electrical connection state of the plurality of batteries, and based on the identified event, control the switching circuit to switch the electrical connection state from the first state to the second state or from the second state to the first state. Other embodiments are possible.

The invention discloses a multifunctional laboratory lifting power supply which is installed on a laboratory ceiling hanger rail through a transverse winch winding lifting mechanism, a motor rotates forwards and backwards to drive a cable to be wound and unwound, a power supply terminal is driven to ascend and descend stably, desktop occupation is avoided, and the installation process is simplified. The power supply terminal integrates a power supply module, a communication module and a safety protection module and is connected with the central control board through a communication bus, and a teacher can remotely and accurately set the upper limits of output voltage and current and monitor the state of the terminal in real time. The bottom of the power supply terminal is provided with a plug, jacks and lighting equipment to meet various experiment requirements. An innovative mechanical structure is combined with an intelligent control system, reliable lifting and voltage remote management of power supply equipment are achieved, the space utilization rate and teaching management efficiency of a laboratory are improved, and an efficient and convenient power supply solution is provided for the laboratory.

A device for the regulation of devices which can be regulated with a 0-10 Vdc and / or PWM command is herein disclosed, the device having at least one power supply input, at least one regulation input adapted to receive external regulation signals, a potentiometer comprising a selector element, the potentiometer being configured to provide a manual voltage regulation, and at least one command output configured to output a command signal towards the devices to be regulated. The device further comprises a switching element configured to cause a switching of said device between a first regulation mode, in which the command signal is generated by said device and is manually adjustable through the selector element of said potentiometer, and a second regulation mode, which allows a regulation of the devices to be regulated via the command signal from the command output based on an external device connectable to the regulation input. A system comprising the above device is also disclosed.

Methods and apparatus for a frequency selective limiter (FSL) having a magnetic material substrate that tapers in thickness and supports a transmission line that has segments and bends. The segments, which differ in width and are substantially parallel to each other, such that each segment traverses the substrate on a constant thickness of the substrate.

The application discloses a frequency selective amplitude limiter and a radio frequency device, and relates to the technical field of microwave radio frequency devices. Specifically, the frequency selective amplitude limiter comprises a planar transmission line structure, a first magnetic film and a second magnetic film. The planar transmission line structure is used for transmitting a microwave radio frequency signal and generating a microwave magnetic field. The first magnetic film covers a first surface of the planar transmission line structure. The second magnetic film covers a second surface of the planar transmission line structure, so that the planar transmission line structure is clamped between the first magnetic film and the second magnetic film. The microwave magnetic field generated by the planar transmission line structure is coupled to the first magnetic film and the second magnetic film at the same time. The first surface and the second surface of the planar transmission line structure are covered by the first magnetic film and the second magnetic film respectively, so that the magnetic coupling efficiency can be improved without greatly increasing the interaction length, and the frequency selective amplitude limiter also has a very low nonlinear starting threshold and a very low insertion loss.

A foldable electronic device according to an embodiment comprises: a first housing including a first motor; a second housing including a second motor; a hinge housing provided between the first housing and the second housing; a flexible display disposed on the first housing, the second housing, and the hinge housing; and a hinge module provided in the hinge housing so as to provide a first rotary shaft configured to receive power from the first motor so that the first housing rotates with respect to the hinge housing, and a second rotary shaft configured to receive power from the second motor so that the second housing rotates with respect to the hinge housing.

A compressed-air supply system includes at least one compressed-air consumer, compressed-air lines, electrically controllable valves, a compressed-air controller for actuating the valves, a compressor having an electric motor as a drive, and a pressure reservoir. The compressed-air consumer can be pneumatically connected to the compressor and / or the pressure reservoir via the lines and the valves such that the compressed-air supply system can be operated either in an open or in a closed operating mode. The controller has an input for a current signal, which represents a motor current drawn or to be drawn by the electric motor. The controller is configured to actuate the valves in accordance with the open operating mode when a current signal is present at the current signal input, the current signal representing a mean motor current, the magnitude of which is equal to or greater than a maximum value for the motor current.

A control circuit and method for DC motors is disclosed in the present application. The control circuit may comprise a voltage monitoring unit for monitoring the output voltage of the DC power supply, a switching circuit for controlling the operation of the DC motor, and a PWM signal output unit to output PWM signal for controlling the switching circuit. The PWM signal output unit may be configured to regulate the duty cycle of the output PWM signal based on the results of the voltage monitoring unit. In this way, motors with different resistances may work continuously in a stabilized state. Also, it may detect when a load like motor is heavy loaded or overloaded, stop motor from starting, and avoid overtime working due to the drop of supply voltage damaging the load like motor. When the voltage of power supply is higher than the rated voltage of the motor, it may regulate the input voltage value of power supply to avoid the increase of excitation current of motor with the increase of the applied voltage, thereby avoid the loss of iron core.

The invention provides a circular knife motor control method and device of a cloth paving machine. The method comprises the following steps: setting a starting current of a circular knife motor, and starting the circular knife motor based on the starting current; acquiring a control signal of a power switch, and if the control signal is a starting signal, turning on a power supply to supply power to the starting and running processes of the circular knife motor; the circular knife motor automatically enters a running state after being successfully started; when the circular knife motor is started, the generation of pulse current is inhibited; when the circular knife motor operates, the current flowing through the circular knife motor is adjusted in a closed-loop mode so that the current on the circular knife motor can be kept constant. Generation of pulse current can be effectively inhibited by utilizing the negative temperature coefficient characteristic of the thermistor, and the problems of rotation speed reduction and power reduction of the circular knife motor caused by increase of the guide rail resistance can be effectively solved by controlling the conduction time of the switch tube between the circular knife motor and the guide rail resistance; the rated rotating speed can be continuously and stably reached in the cloth cutting process, and cloth cutting is facilitated.

The invention relates to a compressed air supply system (30), in particular for a motor vehicle, which comprises at least the following components: - one or more compressed air consumers (34), - compressed air lines, - electrically controllable valves, - a compressed air controller (56) for controlling the electrically controllable valves, - a compressor (12) having an electric motor (14) as a drive, and - a pressure accumulator (36). The compressed air consumer or consumers (32) is / are or can be pneumatically connected via the compressed air lines and electrically controllable valves to the compressor (12) and / or to the pressure accumulator (36) in such a manner that the compressed air supply system (30) can be operated in either an open operating mode or a closed operating mode. According to the invention, the compressed air controller (56) has a current-signal signal input for a current signal which represents a motor current (IB) which has been or is to be consumed by the electric motor (14) driving the compressor (12). The compressed air controller (56) is designed to control the electrically controllable valves according to the open operating mode of the compressed air supply system (30) when a current signal (SIB) applied to the current-signal signal input (92) represents an average motor current (IB) having a value greater than or equal to a predefined maximum value (Imax) for the motor current.

The utility model discloses a multifunctional electric sofa control circuit powered by a power bank. Comprising a power bank, a power receiving chip circuit, a DC-DC conversion circuit, an LDO circuit, an MCU, a sofa extension or contraction control circuit, a headrest extension or contraction control circuit, a ventilation control circuit, an air bag control circuit, a vibration massage circuit, an LED lamp control circuit, a Bluetooth sound box power supply circuit and a heating pad control circuit. The power receiving chip circuit converts electricity output by the power bank into first direct current, the first direct current passes through the DC-DC conversion circuit and then outputs second direct current, and the second direct current is further connected with the LDO chip circuit and outputs third direct current to supply power to the MCU. According to the utility model, all functional circuit modules can be controlled in a centralized manner, and the integration degree is high; the first direct current supplies power to the first motor and the second motor, the second direct current supplies power to other functional modules, the control circuit is simplified, the stability of the control circuit is improved, and various functions can meet various requirements of users.

The application provides a motor identification method based on a battery management module, a motor identification system and a dust collector. The motor identification method based on the battery management module comprises but is not limited to the following steps: in the starting process of the motor, the battery management module controls the opening of a MOS tube, wherein the MOS tube controls the on-off of the starting current of the motor; when the MOS tube is opened and before the motor starts to rotate, an analog-to-digital converter built in the battery management module is used to collect the starting current flowing through the MOS tube; the battery management module collects the power supply voltage of the motor; according to the collected starting current and power supply voltage, the characteristic constant of the motor is determined; and according to the characteristic constant, the model of the motor is determined.

A directional coupler includes an input connector, an output connector, and at least one tap connector. The directional coupler also includes a primary line connecting the input connector to the output connector and configured to carry an RF signal and an AC signal, and a secondary line connecting the primary line to the at least one tap connector and configured to carry a split off portion of the RF signal. The directional coupler also includes a tapped line circuit which is inhibited from carrying the AC signal. The mainline transformer includes a ferrite element surrounding the primary line and which is split in at least one location to include a gap of non-magnetic material that inhibits saturation of the ferrite element.

This utility model discloses a series resistance starting device for a DC oil pump, including a power supply device, a control device, a resistor device, a cut-off device, and a heat dissipation device. The series resistance starting device provided by this utility model can meet the combination and switching of various resistor specifications. One device can meet the starting and testing of multiple DC oil pumps with different power, solving the problem that various resistor starting devices of different specifications are required to test oil pump motors with different power, and further reducing the time cost and equipment cost of testing.

A wireless communication system includes a transmitter configured to transmit at least first and second electromagnetic waves having different frequencies F1 and F2, respectively; a first substantially linear passive medium; a first substantially nonlinear passive medium disposed adjacent to the first substantially linear passive medium; and a first magnetic film covering at least a portion of the first substantially linear passive medium. When the transmitter transmits the first and second electromagnetic waves, the first substantially linear passive medium and the first substantially nonlinear passive medium receive the first and second electromagnetic waves and generate first and second signals propagating therethrough at the respective frequencies F1 and F2. At least one intermodulation signal having a frequency F3 equal to nF1 + mF2 (m and n are positive or negative integers) is generated in the first substantially nonlinear passive medium. The first magnetic film reduces the at least one intermodulation signal by at least 2 dB.

A method for controlling a brushless DC electric motor, in particular a motor for driving an airflow generator, said method comprising a step (2) of starting said motor up to a target speed (Vc) which may take different values, said method further comprising a parallel step (6) of measuring and / or estimating the speed (V) of the motor, said starting step (2) comprising a step (8) of controlling the speed (V) of the motor in open loop up to a speed (Vb), referred to as the switching speed, and a step (10) of controlling the speed (V) of the motor in closed loop from said switching speed (Vb), said method comprising a step (12) of applying a switching rule according to which the switching speed (Vb) is variable at least below a fixed speed (Vr), referred to as the reference speed,so that said tipping speed (Vb) is equal to said target speed (Vc) or said reference speed (Vr). Figure for the abbreviation: Figure 1,

The application provides a control circuit and method of a direct current motor, the circuit comprising a direct current power supply module, a processing module, a voltage boosting module and a drive control circuit, the direct current power supply module being connected to a power supply and outputting a direct current power supply signal to the processing module and the voltage boosting module, the voltage boosting module converting the direct current power supply signal into a voltage boosting signal and outputting the voltage boosting signal to the drive control circuit, the processing module being used for comparing and processing a control signal input to the motor by an MCU and outputting a drive signal to the drive control circuit according to the control signal; the drive control circuit comprising two groups of half-bridge drive integrated chips and four MOS tubes, and two MOS tubes being controlled to be turned on or turned off by each group of half-bridge drive integrated chips. The application can solve frequent stepless rapid starting, braking and reversing, can meet various different special operation requirements of an automatic system in a production process, and can ensure smooth, efficient and stable motor starting and operation process, and can accurately control the direct current motor to rapidly start, brake and reverse.

This invention provides a control circuit and method for a DC motor. By connecting the DC motor to a DC power supply, the control circuit includes a voltage monitoring unit for monitoring the output voltage of the DC power supply and a switching circuit for controlling the operation of the DC motor. The control circuit also includes a PWM signal output unit to output a PWM signal for controlling the switching circuit. The PWM signal output unit is configured to adjust the duty cycle of the output PWM signal based on the voltage monitoring unit's result. This allows motors with different resistance values ​​to continuously operate in a voltage-stabilized state. It also identifies when the motor or other loads are under heavy load or overload conditions and stops the motor from starting, preventing damage to the motor or other loads due to power supply voltage pull-down after prolonged operation. When the input power supply voltage is too high, it can adjust the magnitude of the input power supply voltage to prevent the motor's excitation current from increasing with the applied voltage, thereby preventing core loss.

The invention relates to a compressed air supply system (30), in particular for a motor vehicle, having at least the following components: one or more compressed air consumers (34), a compressed air line, an electrically controllable valve, a compressed air control unit (56) for actuating the electrically controllable valve, a compressor or compressor (12) having an electric motor (14) as a drive, and a pressure accumulator (36). The one or more compressed air consumers (32) are or can be pneumatically connected to the compressor or compressor (12) and / or the pressure accumulator (36) via a compressed air line and an electrically controllable valve, such that the compressed air supply system (30) can be operated either in an open operating mode or in a closed operating mode. According to the invention, the compressed air control unit (56) has a current signal input for a current signal which represents a motor current (IB) consumed or to be consumed by an electric motor (14) driving the compressor or compressor (12). The compressed air control unit (56) is designed to actuate the electrically controllable valve according to an open operating mode of the compressed air supply system (30) when a current signal (SIB) is applied to the current signal input (92), said current signal representing an average motor current (IB) whose magnitude is equal to or greater than a predetermined maximum value (Imax) of the motor current.

The invention provides a circuit breaker. The circuit breaker comprises a motor, a control circuit connected with the motor, an opening and closing driving module and an interlocking control module, the motor is controlled by a bidirectional polarity power supply; the interlocking control module comprises an automatic microswitch and a manual microswitch; the control circuit comprises a plurality of diodes, and the plurality of diodes form a conduction loop so as to provide unidirectional polarity voltage for the motor; and the opening and closing driving module is used for driving a contact of the circuit breaker to act when the state of the automatic microswitch and / or the manual microswitch changes, so that the motor is electrified to execute opening and closing, and the interlocking control module controls the automatic microswitch and the manual microswitch in the interlocking control module in a cooperative manner. The conduction loop simplifies the mechanical structure while keeping the manual operation function, and has the advantages of improving the equipment reliability and realizing intelligent state monitoring.

An electric working machine according to one embodiment of the present invention is provided with a motor, a drive switch, and a control unit. The control unit increases the magnitude of the applied voltage applied to the motor on the basis of the driving switch being turned on. The control unit suppresses an increase in the magnitude of the applied voltage on the basis of the actual rotation speed of the motor having reached the set rotation threshold value.

The invention relates to the field of motor control, in particular to a brush motor control circuit and a control method. The circuit comprises a first single-pole double-throw relay, a second single-pole double-throw relay, a third single-pole double-throw relay and a fourth single-pole double-throw relay, wherein a movable contact of the first single-pole double-throw relay is connected to a first electric brush of a brush motor; a normally open contact of the first single-pole double-throw relay is connected to an anode of a direct-current power supply; a normally closed contact of the first single-pole double-throw relay is connected to a cathode of the direct-current power supply; a movable contact of the second single-pole double-throw relay is connected to a second electric brush of the brush motor, a normally open contact of the second single-pole double-throw relay is connected to the anode of the direct-current power supply, a normally closed contact of the second single-pole double-throw relay is connected to the cathode of the direct-current power supply, and a first end and a second end of a coil of the second single-pole double-throw relay are connected to the anode of the direct-current power supply; the high-side driving circuit comprises a first control switch; the low-side driving circuit comprises a second control switch and a third control switch; and a main control chip. By adopting the brush motor control circuit, the working reliability of the motor control circuit can be effectively improved.

This application belongs to the field of intelligent control and mechatronics technology, specifically a DC motor control system, a window opening system, and a control method. Specifically, the DC motor control system includes a main controller, sub-control units, and a two-wire transmission unit. The main controller superimposes a polarity switching control signal onto the power supply current, and the sub-control units parse this signal or respond to local commands to drive the motor in forward and reverse rotation. The system provided in this application uses only two wires (A / B) for power supply and communication, and is suitable for window opening scenarios with both centralized control and local manual dual-mode operation, as well as other DC motor control scenarios with similar application needs.

An electronic device according to an embodiment of the present disclosure may comprise: a memory for storing instructions; a first housing; a second housing disposed to be able to move in a first or second direction with regard to the first housing, the second housing overlapping at least a part of the first housing; a flexible display mounted at least partially on the surface of the second housing such that at least a part of an externally exposed area thereof is reduced or expanded on the basis of the movement of the second housing; a motor for driving the second housing so as to move in the first or second direction; a drive circuit for controlling the driving of the motor; and a processor. The instructions may be configured to cause, when executed by the processor, the electronic device to: transmit a motor driving signal for driving the motor to the drive circuit upon receiving a trigger signal related to reduction or expansion of the flexible display; calculate the distance of movement of the second housing or the flexible display on the basis or the rate of rotation of the motor and the time of operation thereof while the motor operates on the basis of the motor driving signal; and initialize the calculated distance of movement upon acquiring a signal related to the position of the second housing or the flexible display.