103results about "Dc motor starters" patented technology

The invention relates to the technical field of motor starting control, and discloses a large-current starting method suitable for a direct current motor, and the method comprises the steps: continuously monitoring the temperature data in the starting process of a driving motor through a temperature detection module, and collecting the current data in the starting process through an OCP detection module; collected temperature data and OCP monitoring characteristics are input into the restart logic module in a delayed mode, the restart logic module judges whether restart is conducted or not according to a preset algorithm and generates a first restart instruction or a second restart instruction, and the bridge drive circuit controls the motor to be started and restarted according to the received instruction till the motor is started successfully. By monitoring temperature and current data in real time, damage caused by overheating or overcurrent of the motor can be effectively prevented, the restart period is dynamically adjusted, the success rate of starting of the driving motor is increased, starting failure caused by overcurrent protection or overheating protection is avoided, and the service life of the motor is prolonged. The problem that in the prior art, when a large-capacity direct-current motor is started, current interruption is prone to occurring is solved.

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 electronic device is provided. The electronic device includes memory that stores instructions, a first housing, a second housing that overlaps a portion of the first housing, a flexible display partially mounted on the surface of the second housing and collapsible or expandable, a motor that drives the second housing to move in a direction relative to the first housing, a drive circuit that controls driving of the motor; and a processor, wherein the instructions when executed by the processor, cause the electronic device to, upon receiving a trigger signal, transmit, to the drive circuit, a first motor drive signal, transmit, to the drive circuit, a second drive signal for abnormally stopping the driving of the motor, and select and execute at least one from among at least one recovery control specified based on the accumulated number of abnormal stops.

Described is an intrinsically multiplexed magnetostatic surface wave (MSSW) device comprising of a pair of transducers that couple to one or more plurality of ferrite films. In embodiments, the ferrite films may be provided as one or more of a YIG, Nickle Zinc Ferrite, Lithium Ferrite configured to simultaneously provide the MSSW device having an associated plurality of MSSW operational bandwidths. The concepts, structure and technique described herein may be used to provide broadband magnetostatic surface wave devices that employ intrinsic multiplexing techniques which enable customizable frequency responses over broad bandwidths.

The utility model discloses an electronic brake circuit for an electric chain saw, which comprises a power supply module, an MCU (Microprogrammed Control Unit) control module, a voltage detection module, a driving module, a front trigger switch S1 and a rear trigger switch S2, the front trigger switch S1 is electrically connected with the input end of the voltage detection module, the rear trigger switch S2 is electrically connected with a battery pack, and the front trigger switch S1 and the rear trigger switch S2 are connected in series; the voltage detection module is used for detecting voltage information of the whole electric chain saw, converting the voltage information of the whole electric chain saw into a VAD signal and transmitting the VAD signal to the MCU control module, the MCU control module is used for comparing the received VAD signal with a preset value in the MCU control module and sending feedback information to the driving module, and the driving module is used for controlling a circuit of the whole electric chain saw to be connected or disconnected. By means of the structure, on one hand, identification and fixation of the switching sequence are achieved, a mechanical interlocking structure does not need to be added, production efficiency is improved, on the other hand, the electronic brake function is achieved, and use safety is further improved.

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.

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.

A boost circuit and method is described for supplying a boost voltage to a rotor of the electric machine, just as the electric machine is pulsed on, the boost voltage aids the rotor in quickly overcoming its start-up inductance, rapidly turn on the rotor. As a result, much faster transition times are realized each time the electric machine transitions from the off state to the on state at the start of a pulse. By reducing the transition time, the overall efficiency of the electric machine is significantly improved.

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.

Systems and methods for operating a communication device. The methods comprise: obtaining a signal; allowing the signal to pass through a junction of a communication path to which a reflective frequency selective limiter is coupled; attenuating unwanted components of the signal using the reflective frequency selective limiter; and reflecting remaining components of the signal by the reflective frequency selective limiter so that the remaining components travel downstream along the communication path.

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.

The present invention discloses a computer fan drive system capable of limiting starting current, including a fan M, and is characterized by further comprising: a photoelectric isolation module: used for conducting or cutting off the entire drive system according to the input voltage; an amplification drive module: connected to the photoelectric isolation module and the fan M respectively, and used for driving the fan M to work when the photoelectric isolation module conducts; a starting current limiting module: connected to the amplification drive module and the fan M respectively, and used for limiting the drive current of the fan M when the fan starts and the drive current increases. The present invention limits the current of the fan during startup through the starting current limiting module, preventing the working voltage of other components of the computer from being pulled down due to the increase in current when the fan starts.

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.

The invention relates to a simple control system and method for a fan lamp, the system comprises a switch control module used for generating a power supply signal waveform and a receiving decoding module used for decoding the signal waveform, the switch control module comprises a mechanical switch assembly used for outputting a motor control signal, and the mechanical switch assembly comprises a waveform generation circuit and a fan switch. The waveform generation circuit comprises a first diode, a second diode and a live wire, the fan switch comprises a low-speed gear, a middle-speed gear, a high-speed gear and a positive and negative rotation switching gear, the low-speed gear is connected with the first diode to generate a negative half-wave signal, the middle-speed gear is connected with the second diode to generate a positive half-wave signal, and the high-speed gear is connected with the live wire to generate a full-wave signal; when in the high gear, a forward and reverse rotation switching gear is triggered to generate a forward and reverse rotation switching signal. Wherein the live wire can be understood as a built-in live wire. Through the power signal waveform modulation and decoding technology, the mechanical switch can control the start-stop, speed regulation, positive and negative rotation and lamp switching functions of the fan.

The invention discloses a method and device for controlling a motor, a storage medium and an electronic device, and relates to the technical field of smart home, and the method for controlling the motor comprises the steps: obtaining an operation distance of the motor; determining a target rotating speed of the motor according to the running distance of the motor; determining a target regulation scheme of the rotating speed according to the real-time rotating speed and the target rotating speed of the motor; and adjusting the rotating speed of the motor to the target rotating speed according to the target adjusting scheme. In this way, the rotating speed of the motor is adjusted according to the matched target adjusting scheme and adjusted to the target rotating speed matched with the running distance of the motor, and the motor can drive the curtain to complete the preset distance at the appropriate speed. Therefore, the problem of non-ideal effect of sudden start and stop or slow start and slow stop of the motor can be avoided, the problems of edge collision, high noise and the like under the inertia effect of the motor are reduced, and the service life of the motor is further prolonged.

A startup control circuit includes a direct current (DC) conversion circuit, a main control unit (50), a first switch circuit (20) and a second switch circuit (30). The first switch circuit (20) is connected to the battery pack (10) and the DC conversion circuit (40). The second switch circuit (30) is connected to a battery pack (10), the DC conversion circuit (40), and a main control unit (50). The first switch circuit (20) is configured to activate the DC conversion circuit (40) to supply power to the second switch circuit (30) and the main control unit (50) after the first switch circuit (20) is triggered. The second switch circuit (30) outputs different voltage waveforms based on different timing sequences of currents flowing from the battery pack (10) and the DC conversion circuit (40) to the second switch circuit (30). The main control unit (50) is configured to output a first drive command when receiving a first voltage waveform.

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.

Method for controlling and / or regulating an electric motor, wherein it is provided that - the electric motor (180, 220) is supplied with electrical energy from a battery (130, 230) and / or a generator (150, 190, 210) and - for control and / or regulation, a high-frequency pulse-width modulated voltage is applied to the electric motor, wherein the motor current (IM) supplied from the battery and / or the generator when the electric motor starts up to operate the electric motor is continuously increased, wherein the increase in the motor current is limited to a predetermined setpoint value within a predeterminable time, and wherein the electric motor is operated at a maximum of a predetermined setpoint speed (ω i j+1 ), whereby it is intended that the target speed is dependent on - the battery voltage, and / or - the load torque on the electric motor is specified.

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 relates to the technical field of motor control, and discloses a driving control method, device and equipment of a direct current motor, a medium and a product. The current voltage of a bootstrap capacitor and the current state of the direct current motor are detected, and an upper switch tube and a lower switch tube are controlled according to a mode matched with the current state; the current voltage of the bootstrap capacitor is adjusted to be the preset driving voltage of the upper switch tube, so that the upper switch tube and the lower switch tube are utilized to drive the direct current motor to operate. According to the application, the voltage of the bootstrap capacitor can be adjusted according to the actual state of the direct current motor, the application scene is wider, and damage to a driving device when the direct current motor is started under the scene that the voltage of the bootstrap capacitor is too high or too low is prevented.

The embodiment of the present invention provides a transfer switch control device, a transfer switch and a rail vehicle, the device comprising: a first trigger button, a first control circuit, a second trigger button, a second control circuit and a drive device; the first trigger button is connected to the first control circuit, the first control circuit is connected to the drive device; the second trigger button is connected to the second control circuit, the second control circuit is connected to the drive device; the drive device is connected to the transfer switch; when the first trigger button is activated, the first control circuit controls the drive device to drive the knife switch of the transfer switch to rotate along the first direction to switch to the target gear position; when the second trigger button is activated, the second control circuit controls the drive device to drive the knife switch of the transfer switch to rotate along the second direction to switch to the target gear position, wherein the second direction is the opposite direction of the first direction. The embodiment of the present invention can improve the operation efficiency.