246results about "Starter arrangements" patented technology

The embodiment of the invention discloses a multiplex type three-stage starting power generation controller, and relates to the technical field of aviation three-stage starting power generators. In the starting stage, an H-bridge inverter in the starting power generation controller provides single-phase alternating-current exciting current for a main exciter stator exciting winding through SPWM modulation so as to establish a pulsating magnetic field to provide exciting current for a main motor, and a three-phase full-bridge inverter provides armature current for a main motor stator armature winding through SVPWM modulation. In a power generation stage, an anti-parallel diode of the three-phase full-bridge inverter is used as a rectification circuit of the auxiliary exciter, and the H-bridge inverter adopts a PWM chopping mode to operate as an asymmetric half-bridge circuit. A power generation controller and a starting controller are integrated into a whole, and by changing the modulation mode of a hardware circuit, the control function of the three-stage starting generator at different stages can be realized by only one controller, so that the structure of the starting power generation controller is simplified, the system integration degree of the three-stage starting generator is improved, and the volume and the weight of the system are reduced.

An electrically powered aircraft is configured to check the health of its motors by determining a flux linkage associated with each of the motors. The flux linkage may be determined by measuring the back-EMF of stator coils of the motor. The flux linkage may be measured while the motor is not powered or may be estimated when the motor is in use. The flux linkage of a motor may be compared to a corresponding threshold value to assess whether the magnet(s) of the motor have degraded to a point at which they pose safety concerns. The flux linkage values may also be used to project when the motor needs to be maintained and / or replaced. The flux linkage value of a motor may be displayed, along with historical flux linkage values for that motor, to show a magnitude of demagnetization of the magnet(s) of the motor.

A power tool includes a housing, a motor, and an actuator configured to be actuated by a user to cause the motor to operate. The power tool includes a depth sensor located adjacent to the output drive device and configured to generate a distance signal. The power tool includes an electronic controller coupled to the actuator and to the depth sensor. The electronic controller determines a first distance between the depth sensor and the workpiece by monitoring the distance signal from the depth sensor during operation of the motor. The electronic controller determines that the first distance has decreased to be less than or equal to the predetermined threshold distance. The electronic controller changes how the motor is controlled to operate in response to determining that the first distance has decreased to be less than or equal to the predetermined threshold distance.

A method for detecting movement of a vehicle body component moveable by an electric motor having a rotor and a three-phase stator, and a motor vehicle. The method includes: loading two stator phases with a pulse-width-modulated voltage and maintaining a third stator phase at a free-floating state; monitoring the third stator phase as a measuring point for an inductive voltage divider formed using the two stator phases; and detecting movement of the vehicle body component when an electric signal at a measuring point or a variable derived from the electric signal exceeds a specified threshold value. The motor vehicle includes a control device that is operable to perform the method.

The motor control device includes: a control signal generation unit 512, generating a motor control signal for supplying drive power to a drive motor 60; an advance angle value setting unit 514, setting a control advance angle value θa for advancing a phase of the motor control signal; and an operation state detection unit 513, detecting an operation state of the opening and closing body. The advance angle value setting unit 514 sets the control advance angle value θa in accordance with the operation state of the opening and closing body detected by the operation state detection unit 513.

A power converter is configured to measure an output current and to determine a multiphase voltage reference as a function of the output current. Within the same switching period the voltage reference is determined, a modulation routine determines a modulation index for each phase of the output voltage. In some instances, one or more phases must start modulation during the switching period before the new modulation index is determined. The modulation routine stores the value of the modulation index generated from the prior switching period and uses the stored value when a new value is not yet ready. An offset value for the phase voltage which used a modulation index from the prior switching period is determined in order to compensate the phase voltages of the other phases and to maintain a desired line-to-line voltage output from the power converter.

A control method, control apparatus and control system for an electric motor, and a computer-readable storage medium are provided. The control method for an electric motor includes: acquiring an initial rotation speed and an initial rotation direction of an electric motor; determining a target start mode for the electric motor according to the initial rotation speed and the initial rotation direction; and according to the target start mode, controlling the electric motor to start. A target start mode, which most conforms to an initial rotation speed and an initial rotation speed direction of an electric motor, can be determined from a plurality of preset start modes, so as to control the electric motor to start.

A motor starting control method, device, and system, the method including: accumulating electrical parameter to obtain accumulated electrical parameter values, which are alternately assigned to a direct-axis electrical parameter and quadrature-axis electrical parameter; accumulating an angular increment to obtain accumulated values of a forced-driving angle; generating a control signal for a motor based on real-time values of the direct-axis electric parameter, quadrature-axis electrical parameter, and forced-driving angle; the control signal drives the motor; repeating said steps until the direct-axis electrical parameter or the quadrature-axis electrical parameter reaches a target electrical parameter, and then continuing accumulating to obtain the accumulated values of the forced-driving angle while forcibly driving the motor based on the corresponding control signal; when the real-time value of the forced-driving angle stays in sync with the rotor angle, the motor completes the startup; the motor is driven by alternately applying two perpendicular forces to the rotor.

The application provides a direct-current motor, a starting control method and device thereof, an air conditioner and a storage medium. The method comprises the following steps: detecting that the controller of the direct-current motor is powered on, obtaining an initial duty cycle corresponding to the direct-current motor pre-stored in the controller; when the initial duty cycle is zero, self-learning the initial duty cycle to obtain a target duty cycle; and controlling the starting of the direct-current motor according to the target duty cycle. The application obtains the target duty cycle, i.e. the optimal starting voltage of the direct-current motor, by self-learning the initial duty cycle when the initial duty cycle is zero, and controls the starting of the direct-current motor according to the target duty cycle when the starting instruction of the direct-current motor is received, so as to avoid the problems of excessive starting voltage or too small starting voltage, excessive starting vibration of the direct-current motor, speed overshoot and delay in starting of the motor, and the problem of poor control of the motor and the controller caused by replacement of the motor or the controller, thereby improving the stability and reliability of the direct-current motor during starting.

To provide a technique capable of holding energization in an electric motor with a simple configuration even after a manual switch for a reciprocating tool is turned off.SOLUTION: A reciprocating tool includes a reciprocating member, an electric motor, a transmission device, a drive circuit, a first manual switch, a switch element and a control circuit. A first contact point of the first manual switch is connected to a power supply, and a second contact point of the first manual switch is connected to the drive circuit. The first manual switch in its on state connects the first contact point to the second contact point. The switch element (i) is turned on when it receives an electric signal, and (ii) establishes electrical continuity between the first contact point and the second contact point in its on state. In response to at least the first manual switch being turned on, the control circuit continues to output the electric signal to the switch element until the drive of the electric motor is stopped.SELECTED DRAWING: Figure 6

The present invention relates to a method for starting a BLDC motor (10) with a trapezoidal shaped induction voltage under high load conditions using a modified two-level discrete fixed-time or fixed-frequency hysteresis current controller, the BLDC motor (10) being driven by an inverter bridge (30) with only one current sensor (20) placed on the busbar and controlled by a processing unit associated with an analog-to-digital converter, the novelty of which consists essentially in the fact that the intensity of the current (Im) of the BLDC motor is controlled by a two-level discrete fixed-time or fixed-frequency hysteresis current controller.

The embodiment of the invention discloses a control method and a control system of a permanent magnet motor, the permanent magnet motor is controlled to start by applying voltage to the permanent magnet motor in at least two stages, and at least one voltage amplitude in the later stage is higher than the voltage amplitude in the previous stage, that is, in the process of controlling the starting of the permanent magnet motor, the voltage amplitude is lower than the voltage amplitude in the previous stage. The amplitude of the voltage applied to the motor is controlled to be gradually increased by stages, so that the impact current can be reduced, smooth starting is realized, and the service lives of the permanent magnet motor and the traction inverter are prolonged. Under at least partial working conditions of locked-rotor, the switching frequency of a power device in a traction inverter connected with the permanent magnet motor is reduced, the conduction time and thermal stress of the power device are reduced, and effective locked-rotor protection is further provided. According to the technical scheme, the starting smoothness and locked-rotor protection of the permanent magnet motor can be considered at the same time, and the system reliability is improved.

The invention discloses a high-power compressor driving circuit, a high-power compressor and a control method of the high-power compressor. The high-power compressor driving circuit comprises a controller, a three-phase half-bridge driving circuit, a three-phase half-bridge circuit and a direct current-direct current converter, the three-phase half-bridge driving circuit is connected with the controller; the three-phase half-bridge drive circuit is connected with the three-phase half-bridge circuit; the DC-DC converter is connected with the controller and the three-phase half-bridge drive circuit. Wherein the three-phase half-bridge circuit comprises 12 insulated gate bipolar transistors, each phase of the three phases of the three-phase half-bridge circuit comprises 4 insulated gate bipolar transistors, and the three-phase half-bridge circuit is used for driving the permanent magnet synchronous scroll compressor connected with the three-phase half-bridge circuit. The permanent magnet synchronous scroll compressor connected with the three-phase half-bridge circuit is driven in a double-tube parallel current expansion mode corresponding to the three-phase half-bridge circuit, the full-load load power of the permanent magnet synchronous scroll compressor can meet the driving refrigeration requirement of large equipment, the on-load overcurrent capacity is enhanced in the double-tube parallel current expansion mode, and the influence of the environment temperature is reduced.

A fan control system according to the present disclosure includes a control unit that selects a control mode from among a plurality of control modes including a first mode and a second mode. The first mode is a control mode in which an electric signal is supplied to a fan motor to cause the fan motor to operate at a first rotational speed. The second mode is a control mode in which an electric signal is supplied to the fan motor to cause the fan motor to operate at a second rotational speed that is lower than the first rotational speed. The control unit has a function of selecting the second mode during a period after the fan motor is started and before the first mode is selected.

One aspect of the present disclosure provides an electric power tool including a motor, a drive circuit, a voltage detector, a first calculator, and a second calculator. The drive circuit applies a power-supply voltage to the motor in accordance with a first duty ratio. The voltage detector detects a magnitude of the power-supply voltage. The first calculator calculates a desired duty ratio based on the magnitude of the power-supply voltage detected. The second calculator increases the first duty ratio from an initial value to the desired duty ratio in accordance with a lapse of time. The second calculator varies a rate of increase of the first duty ratio based on the magnitude of the power-supply voltage detected.

A method and apparatus for detecting the position of a rotor of an electric motor, and an electric tool. The method for detecting the position of a rotor of an electric motor comprises: applying a voltage pulse to each set of windings of an electric motor (S110); acquiring a response current generated by each set of windings on the basis of the voltage pulse, wherein the response current comprises at least one of a bus current and a phase current (S120); on the basis of the response current of each set of windings, determining a required time for each set of windings to reach a preset current threshold (S130); and on the basis of the required time of each set of windings, determining an initial position of a rotor (S140).

The application belongs to the field of integrated permanent magnet synchronous motor control system design, and particularly relates to an integrated permanent magnet synchronous motor open loop-closed loop switching control method and a control system. The open loop control is designed at the same time as starting the closed loop calculation. When the open loop output speed reaches the open loop-closed loop switching speed and the closed loop control output target speed reaches the open loop-closed loop switching speed, the open loop control is switched to the closed loop control, and the motor is controlled in the closed loop mode, so that the motor control speed fluctuation is small, the speed following property is good, and the switching process is smooth.

The invention discloses a permanent magnet synchronous motor starting control method based on high-frequency square wave injection. A bus voltage threshold value is set; during initial starting, high-frequency square waves are injected into the d axis, and the rotor position and the angular speed are obtained; performing reverse braking and forward starting control on the rotor according to the rotor position and the angular speed; during braking, reverse torque is applied to the rotor through rotating speed and current double-closed-loop control; circularly acquiring real-time bus voltage and comparing the real-time bus voltage with the bus voltage threshold value; and if the real-time bus voltage exceeds the bus voltage threshold, increasing the voltage amplitude of the high-frequency square wave injected by the d axis. The rotor position and the angular speed are obtained by injecting the high-frequency square waves, and the problem that the rotor observer is large in error at the low speed is solved; when the reverse rotation is started, the current of the stator coil is increased by increasing the voltage amplitude of the high-frequency square wave, so that the stator coil is used as an energy-consuming circuit to consume the counter electromotive force, the real-time bus voltage is reduced, and the cost is reduced.

Provided is a switching module and a process of commutating the switching module. The switching module includes an H-bridge circuit with bidirectional switches and an active clamp with switches that are also arranged as an H-bridge. The process of commutating the switching module includes a sequence of alternating first and second commutation events where timing signals used to control the switches during each commutation event are varied according to closed loop control of the voltage across the energy storage device of the active clamp.

The present invention refers to a starting method with two-levels modified and discrete fixed-time or fixed-frequency hysteresis current controller, under high load conditions, of a BLDC motor (10) with trapezoidal-shaped induced voltages, wherein the BLDC motor (10) is driven by an inverter bridge (30) with only one current sensor (20) positioned in the busbar, controlled by means of a processing unit associated to an analog-digital converter, wherein the novelty basically comprises the fact that: the intensity of the BLDC motor current (Im) is controlled by means of the two-levels and discrete fixed-time or fixed-frequency hysteresis current controller.

The utility model discloses a single-phase brushless motor time-delay starting operation module, which mainly comprises a brushless motor main body and a matched control assembly, and comprises two 41F type Hall sensors which are connected in parallel, a common pull-up resistor and the like. The two Hall sensors are symmetrically installed on the two sides of the geometric center line of a stator magnetic pole, the detection faces face a rotor permanent magnet, high and low levels are output through induction of rotor magnetic pole changes, the H-bridge power tube is controlled, and stator coil power supply state switching is achieved. During working, according to the characteristics of the Hall sensor, the motor is controlled to be started and run according to the principle that the motor is firstly turned off and then turned on, and the dead time control unit generates 0.5-2 ms power tube switching delay. According to the module, the starting success rate of the motor is greatly improved, the starting failure risk is effectively reduced, and the vibration amplitude in the starting process is obviously reduced. In the operation stage, the motor efficiency is remarkably improved, and the rotating speed fluctuation is extremely small when the load changes. Moreover, the circuit design of the module is simplified, so that the hardware cost is greatly reduced.

This invention relates to the field of brushless motor technology, and discloses a brushless motor system and control method, including a sampling module; a hybrid observer for real-time sampling of motor terminal voltage, line current, and current slope, and predicting rotor position using an adaptive algorithm; a dynamic commutation compensation module for real-time detection of motor line current and back EMF waveforms, and adjustment of commutation angle and PWM duty cycle; an adaptive controller responsible for signal processing, adaptive startup, and PWM generation; and an inverter for driving the brushless motor according to the PWM control signal. This invention achieves high-precision rotor position estimation under sensorless conditions through a hybrid observer design. The hybrid observer integrates back EMF detection and current slope estimation, effectively compensating for noise caused by freewheeling current, eliminating phase lag and chattering caused by the low-pass filter in traditional sliding mode observers, and improving the accuracy of rotor position information.

A switching module (10p) is described. The switching module (10p) comprises an H-bridge circuit (16) with bidirectional switches (S1-S4) and an active clamp (18) with switches (S5-S8) that are also arranged as an H-bridge. A process of commutating the switching module (10p) comprises a sequence of alternating first and second commutation events. The timing signals used to control the switches (S1-S8) during each commutation event are varied according to closed loop control of the voltage across the energy storage device (C) of the active clamp (18).

The application provides an electromechanical brake device braking force observation method, system, equipment and storage medium, and relates to the field of brake control methods.The electromechanical brake device braking force observation method comprises the following steps: using a current closed-loop control method to make a brake motor output a braking force, to push a mechanical actuator into contact with a brake disc, to gradually increase motor cross-axis current, to measure a brake disc pressure and a lead screw displacement characteristic curve, to use a third-order mathematical model to fit a curve expression, to measure the displacement of the mechanical actuator in a braking state, to obtain real-time braking force, and finally to design a brake gap adjustment method to ensure the reliability of the braking force observation.The application realizes the observation mode of the braking force of the electromechanical brake device, meets the precision requirement of the braking force observation of the electromechanical brake device, reduces the installation cost of the system, and improves the stability of long-time operation of the system.

The semiconductor device includes: a current detection circuit configured to detect a current flowing through a three-phase motor by driving of a drive circuit; and a controller configured to control the drive circuit, based on the detected current. The controller is configured to control, when the three-phase motor is stationary, an energization pattern in such a way that a wave detection current sequentially flows from the drive circuit to each phase of the three-phase motor, to obtain, from the wave detection current detected by the current detection circuit, a first, a second and a third interphase current differences, each of which is a difference among wave detection currents flowing in directions opposite to one another, to determine the energization pattern based on a magnitude relationship among the first, the second and the third interphase current differences.

The invention relates to the technical field of industrial automation and motor control, discloses a wide-temperature starting method and system for an industrial internet brushless motor, and aims to solve the problems of starting parameter mismatch, stalling or torque oscillation caused by physical delay of a temperature sensor and a reactive control strategy in the prior art. The method comprises the following steps: collecting thermal state and electric state data of a motor in real time, and constructing a multi-dimensional time sequence characteristic matrix; predicting a future temperature trajectory through an eight-bit integer quantization LSTM model deployed at an edge end; a global thermal environment early warning instruction issued by the cloud is fused, and a corrected temperature track is generated; based on the track, calculating an optimal starting control parameter by using a motor physical parameterization model and executing starting; and after starting is completed, uploading a data log for iteration of the cloud model. According to the application, the starting reliability and the control performance of the brushless motor in a wide temperature range are remarkably improved through an edge cloud collaborative zero-lag temperature prediction and prospective parameter generation mechanism.

The present invention provides a computer-implemented method for starting a hydrogen recirculation blower in a fuel cell system, comprising an electric drive motor, the electric drive motor comprising a rotor and a stator, comprising the steps of: receiving a start signal for the electric drive motor; acquiring a temperature signal indicative of a temperature in the hydrogen recirculation blower after receiving the start signal; assigning the temperature signal to a defined temperature range; defining the temperature range; selecting a temperature range-specific set of parameters for carrying out a signal injection method to determine the position of the rotor in the electric drive motor; carrying out the signal injection method with the parameters of the selected set of parameters; and determining the rotor position.and commissioning of the electric drive motor as well as a hydrogen recirculation blower with an electric drive motor and a hydrogen-based fuel cell system with a hydrogen recirculation blower.;