125results about "DC motor speed/torque control" patented technology

The invention discloses a robust Bayesian identification method for a state space model of a DC motor motion system, and relates to the technical field of industrial automation. The invention aims to solve the problem of poor model parameter estimation precision under the conditions of non-Gaussian noise and unknown system state in the prior art. The method comprises the following steps: establishing a mathematical description of a parameter identification problem of a state space model of a direct current motor motion system to determine to-be-identified parameters of the state space model of the direct current motor motion system; constructing posterior distribution of the to-be-identified parameters; constructing an augmented state space model having the same form as the logarithmic posteriori distribution of the to-be-identified state vector, and optimizing the to-be-identified state vector according to the augmented state space model; and carrying out iterative calculation by utilizing an optimization result and the posterior distribution of the other to-be-identified parameters except the to-be-identified state vector to obtain parameters of the state space model of the direct current motor motion system until a convergence condition is met, and completing parameter identification of the state space model of the direct current motor motion system.

This invention discloses a control method, device, and system for suppressing current ripple in a coreless brushed DC motor, belonging to the field of DC motor control. The method includes: using an H-bridge Buck converter as the driving topology to provide smooth voltage; designing a state feedback controller based on its state-space model to adjust the dynamic current response; simultaneously designing nonlinear disturbance observers to compensate for matched disturbances in the inductor branch and unmatched disturbances and their derivatives in the capacitor branch; innovatively designing a multi-channel quasi-resonant proportional-integral resonant observer to observe and compensate for the unmatched periodic disturbances caused by motor component commutation, with higher precision; and finally synthesizing a composite control law to drive the motor. The device and system correspondingly implement the above method. Compared with higher-order disturbance observers, the multi-channel quasi-resonant proportional-integral resonant observer proposed in this invention significantly improves the compensation capability for unmatched periodic disturbances, effectively suppressing current ripple in the coreless motor and improving torque stability.

The invention relates to an electric tool (1), in particular a hand-held electric tool, e.g. a polisher (1A), a grinder and / or a saw (1B), comprising a tool (2), an electric motor (3) for driving the tool (2), and a control unit (4) for controlling the electric motor (3), the electric tool (1) being designed to be connected to a mains voltage (V1) and comprising a rectifier assembly (12) with a DC link (15) for supplying a DC link voltage (V2) on the basis of the mains voltage (V1), wherein the DC link voltage (V2) includes a plurality of successive voltage half-waves (16), and the control unit (4) is configured to provide, for each voltage half-wave (16), a torque half-wave (36) for controlling the electric motor (3), the shape of the torque half-wave (36) being flatter than the shape of the voltage half-wave (16).

This invention discloses a method for calculating the back electromotive force (EMF) of a multi-element winding in a hollow cup armature brushed motor and a motor system thereof. The method includes: obtaining the parameters of a parallel magnetized permanent magnet and calculating the fundamental amplitude of the radial air gap magnetic flux density; obtaining the winding parameters and calculating the flux amplitude linked by a single-turn coil rotating in a magnetic field; calculating the back EMF amplitude per unit element based on the total number of turns and elements, and the coil rotation angular velocity; and vector-combining the back EMF generated by each element according to the electrical angle of the back EMF generated by each element to obtain the magnitude of the synthesized back EMF of the entire coil winding; integrating the waveform of the back EMF based on the magnitude of the back EMF amplitude and the number of commutations of the motor to obtain the average value of the motor's back EMF and the constant value of the motor's back EMF. This invention obtains the analytical formula for calculating the radial air gap magnetic flux density and the fundamental amplitude of the radial air gap magnetic flux density by analyzing the magnetomotive force and air gap permeability, ensuring the accuracy of the motor's back EMF calculation.

This invention belongs to the field of cooling technology, and particularly relates to a temperature measurement and automatic cooling system for power distribution rooms, including a cooling device and a control device. The cooling device includes a housing with a connecting component on it, and an exhaust fan mounted on the connecting component. One side of the housing is open, and the other side has a circular through hole, with a temperature sensor installed inside. The connecting component includes a mounting platform located at the center of the circular through hole and connected to a vortex ring. A fixing ring is provided at the top, with a first groove on its lower surface that fits against the vortex ring. One end of the fixing ring is inside the circular through hole, and the other end is outside. A first reinforcing plate is provided at the upper end of the fixing ring, and a second reinforcing plate is provided at the lower end of the vortex ring. A second groove is provided on the upper surface of the second reinforcing plate that fits against the vortex ring. The first reinforcing plate is located inside the circular through hole, and the second reinforcing plate has the same dimensions as the first reinforcing plate. This system can reduce resonance, lower the failure rate of the exhaust fan after long-term use, increase the service life of the exhaust fan, and improve the cooling effect of the power distribution room.

The utility model relates to a voice coil motor of a die bonder, in particular to a drive and current detection circuit for the voice coil motor of the die bonder, which comprises an isolation optocoupler circuit and a circuit for isolating and protecting a control signal sent by an MCU (Microprogrammed Control Unit) from the voice coil motor. The DAC module is used for programming input voltage, digitally controlling the voltage of the voice coil motor so as to control the current of the voice coil motor, and inputting the output voltage to the precise operational amplifier circuit; the precise operational amplifier circuit is used for conditioning the output voltage of the DAC module by taking a reference source as a reference voltage and inputting the output voltage to the power driving circuit; the power driving circuit is used for providing voltage suitable for driving for the voice coil motor according to the output voltage of the precise operational amplifier circuit and the current of the voice coil motor; according to the technical scheme provided by the utility model, the defects that the output stability of the voice coil motor is poor and the current of the voice coil motor is difficult to effectively and quantitatively detect in the prior art can be effectively overcome.

An actuator driving device includes a driving coil that generates a driving force with first and second voltages; and a control unit, which sets one of the first and second voltages to a first pulse, sets the other one to a second pulse, and performs at least one of: a first control for modulating one pulse width of the first and second pulses with a change amount larger than that of the other pulse width so that a pulse width of ON time of the second pulse is within a pulse width of ON time of the first pulse; and a second control for modulating one pulse width of the first and second pulses with a change amount larger than that of the other pulse width so that the pulse width of the first pulse in ON time is within the pulse width of the second pulse in ON time.

Embodiments of this application disclose a motor driving method, an apparatus, and a system, and relate to the chip field. The solution may include: When a motor control apparatus determines that a motor needs to rotate at a maximum torque, the motor control apparatus controls a drive to output a first current to drive the motor to rotate. The first current is greater than a rated peak current of the drive and is less than or equal to a maximum load current of the drive. This method can resolve a problem that a waste of costs is caused because a through-current capability improved by a redundancy design of a switching transistor of a motor drive cannot be fully utilized for most customers and application scenarios.

An electrical switch unit comprises: an actuator that is moveable between an ON position and an OFF position, and a signalling module that outputs a signal indicating the movement or position of the actuator. The signalling module comprises a variable resistor element 110 disposed on a circuit board 120, a film 130, and a moving component 100 connected to the actuator. A conductive layer 130A is disposed on a first surface 130C of the film 130, which is spaced apart from the variable resistor element 110 by a space 150. One end of the conductive layer 130A is electrically connected to the circuit board 120. Movement of the actuator moves the moving component 100 relative to a second surface 130D of the film 130, to urge the conductive layer 130A of the first film surface 130C to form contact with the variable resistor element 110, so that the effective resistance of the variable resistor element changes in response to movement of the actuator. [Figure 5A]

To provide an electric tool that achieves a good power factor when ohmic power loss is small. [Solution] An electric tool having a tool, an electric motor for driving the tool, and a control unit for controlling the electric motor, wherein the electric tool is configured to be connected to a power supply voltage and includes a rectifier device having an intermediate circuit for providing an intermediate circuit voltage based on the power supply voltage, the intermediate circuit voltage having a plurality of voltage half-waves that are successive to one another, and the control unit is configured to provide, for each voltage half-wave, each torque half-wave 36 for controlling the electric motor, the curve shape of which is flattened compared to the curve shape of the voltage half-wave.

The application relates to the technical field of magnetic positioning, in particular to an automatic nail cat-eye effect nail effect generation system based on magnetic rotary positioning, which comprises a switch control module, a data computer mainboard, a power supply module, a driving module, an image detection module, a current detection module, a calibration determination module, an execution module and a database. The system processes, analyzes and pre-processes image data detected; the cat-eye effect manufacturing state is determined by comparing the area coincidence proportion of the reflection area with a preset threshold value; the current target slope is adjusted based on the determination result, the voltage regulation loop response bandwidth is adjusted, and the opening radius of the magnet and the driving signal duty cycle are further determined according to the adjustment result; the application realizes unified processing of the area coincidence proportion of the reflection area and optimization of the analysis performance, effectively improves the detection, processing accuracy and resource utilization rate of the cat-eye effect generation system.

Method for operating at least one device for building up pressure or force in a vehicle, in particular a motor vehicle, wherein the device comprises an electric motor and a control unit, wherein the electric motor is supplied with a voltage for control by means of the control unit, characterized in that the maximum possible torque provision (M max ) of the motor is determined and based on the maximum possible torque provision (M max ) the availability of the engine is determined.

The application discloses a driving mode control method, a motor driving method and system, and a photographing module. The driving mode control method comprises the following steps: acquiring a first starting time of a signal synchronization process of the photographing module in a photographing process, a second starting time corresponding to an analog-digital conversion process, and a switching time of switching from a first mode to a second mode; acquiring a first difference t1 between the first starting time and the second starting time; acquiring a second difference t2 between the switching time and the second starting time; calculating a delay time according to at least one parameter in a mode conversion period of the analog-digital conversion process, the first difference t1 and the second difference t2, wherein the delay time is used for delaying a mode switching operation, and the analog-digital conversion process is avoided from the second mode; and switching from the second mode to the first mode by taking the delay time as a reference after detecting a synchronization signal. The application can improve the quality of a photographed image.

Disclosed in the present application are an electric motor ripple processing method and apparatus, and a device and a storage medium. The method comprises: on the basis of an initial number of sampling points per cycle, performing reading starting from a starting point position of an electric motor ripple sampling sequence; performing transformation detection processing on a processing sequence to obtain N cycle segmentation point positions in a relevant transformed sequence; then, updating the initial number of sampling points per cycle; in chronological order, on the basis of a new initial number of sampling points per cycle, reading, starting from a first starting point position, a new processing sequence from the electric motor ripple sampling sequence, and repeating the abovementioned operations until the processing of the electric motor ripple sampling sequence is completed; and finally, by means of all the cycle segmentation points, performing cycle segmentation on the electric motor ripple sampling sequence. Thus, an electric motor ripple cycle is accurately estimated, such that the normal operation of an anti-pinch function of a vehicle is ensured, thereby improving the user experience.

The invention provides a control method of an electric tool and the electric tool thereof, and is applied to the field of electric tools. The control method comprises the following steps: determining whether a fastener begins to be seated or not by acquiring a current change rate during operation of the electric tool; and when the fastener is seated, current parameters within a preset time period are obtained, a control instruction is generated according to the current parameters, and the tool is made to automatically enter a first operation mode or a second operation mode. According to the method, the workpiece type is automatically recognized, the corresponding operation mode is executed, the trouble of frequently switching tool modes is avoided, and the tool use efficiency is improved. Compared with the prior art, the problem that a tool is excessively driven into a workpiece or the workpiece is damaged can be effectively avoided, the working efficiency is improved, and the working precision is guaranteed.

A method for detecting a clamping condition of a seat assembly for use in a motor vehicle comprises determining a rotational speed of an output shaft of an electric motor, determining a new time constant TCnew for the rotational speed, and detecting the clamping condition if the new time constant TCnew is greater than a calibrated calibration factor G multiplied by a predetermined time constant TCn. A second method for detecting a clamping condition comprises determining a power difference between an electrical power provided to the motor and a mechanical power delivered by the motor, and calculating an amount of energy E by integrating the power difference over a period of time. A second method determines that a gripping condition has occurred based on the amount of energy E and based on an energy threshold TH.

The invention relates to a brush direct current motor driving device, method and equipment, the brush direct current motor driving device comprises a controller, a position detection unit and a motor driving circuit, the controller receives a control instruction signal and a position feedback signal which are externally input, and outputs a control signal; the position detection unit is arranged on the output side of the brush direct current motor, is connected with the controller, detects the actual rotation angle of an output shaft of the brush direct current motor, generates a corresponding position feedback signal and sends the position feedback signal to the controller, and the motor driving circuit is connected between the controller and the brush direct current motor and drives the brush direct current motor to operate according to a control signal. And the controller analyzes the control instruction signal into a target angle position, reads a position feedback signal to obtain a current angle position, adjusts parameters of the control signal according to an angle error between the target angle position and the current angle position, and outputs the parameters to the motor driving circuit to reduce the angle error. And the use reliability of the brush direct current motor is improved.

The invention relates to the technical field of electronic circuits, and discloses a DC brush motor disturbance power filter circuit, which comprises a main filter module, a working condition sensing module, a pulse characteristic detection module, a controllable transient damping module, a ringing state evaluation module and a cooperative control module. The operating condition of the motor is monitored in real time through the working condition sensing module, the pulse characteristic detection module identifies a transient pulse event and evaluates the ringing state, the cooperative control module integrates the information, dynamically tunes the filtering parameters of the main filtering module, and accurately triggers the controllable transient damping module to introduce damping, so that the control precision of the motor is improved. According to the invention, adaptive high-efficiency filtering of wide-working-condition conducted disturbance of the direct-current brush motor is realized, active rapid suppression of transient ringing is realized, the electromagnetic compatibility, the power quality and the operation stability of a system are remarkably improved, and the limitation of a traditional fixed parameter filter in a complex dynamic environment is overcome.

An electric machine is provided. A power converter is coupled between a power supply and a wound field synchronous machine. The power converter is arranged to provide a pulsed operation by providing a pulsed DC current to field windings of the wound field synchronous machine.

The present invention relates to an electric steering device having a vehicle load detection function, which detects a vehicle load using a vehicle speed and a handwheel torque detected from a handwheel sensor included in an electric steering device and a motor current detected from an electric steering motor, and outputs a driving signal for controlling the motor current applied to the electric steering motor. Since the present invention does not use a separate vehicle load detection sensor device, it is possible to solve both a problem of having to secure a physically separate external space to install a conventional vehicle load detection sensor device when a vehicle steering device is implemented and a problem of causing a direct increase in the cost of the steering device due to the installation of the sensor device.

The present invention concerns a motor drive unit for driving a direct current electric motor comprising a moving part equipped with permanent magnets. The motor drive unit, which is powered by a voltage supply source, comprises a switch circuit, an inductor circuit and a capacitor circuit comprising a set of capacitors. By selectively opening and closing the switches of the switch circuit, a series of consecutive low energy pulses can be generated such that the power consumption of the motor drive circuit is minimised.

The invention discloses a motor, a motor control method, a suspension system and a vehicle, and relates to the technical field of automobile suspensions. The motor comprises a stator, a rotor, a limiting part and a matching part; the stator comprises a casing and a magnet, the casing is provided with a channel with an opening at one end, and the magnet is arranged in the casing. The rotor comprises a coil support and a coil, the coil support is arranged in the channel and can move in the axial direction of the channel, and the coil is arranged on the coil support, matched with the magnet and drives the coil support to move in the axial direction of the channel when powered on. The matching part is arranged on the shell; the limiting part is arranged on the coil support, the limiting part and the matching part are sequentially arranged in the axial direction of the channel, and the maximum distance between the limiting part and the matching part is adjustable. According to the scheme, the maximum distance between the limiting part and the matching part can be adjusted according to requirements, so that the limit position of the coil bracket during extension can be adjusted, the limit displacement of the rotor can be flexibly adjusted, the adaptive capacity of the motor under different working conditions is improved, and meanwhile, the stability and the safety of the movement of the rotor are guaranteed.

The present invention suppresses collision of a movable part to a machine end in a stopped state of a camera module. In the second mode, the vibration detection unit (240) electrically connects both ends of the coil of the voice coil motor (106) and detects the presence or absence of vibration of the camera module (100) on the basis of the current flowing through the coil. In the second mode, the control unit (210) sets the output of the drive unit (220) to a high impedance, and when the vibration is detected by the vibration detection unit (240), the control unit (210) shifts to the third mode and generates a control signal (S4) such that the movable unit is fixed at a predetermined position.

In the embodiments of the present invention, a motor driver is provided, comprising a first channel module, a second channel module, and a switch module connected between the first and second channel modules, wherein the switch module is used for enabling the first and second channel modules to form corresponding current channels, respectively, according to the level signal output by the micro controlling unit wherein for different level signals, the first channel module forms different current channels and the second channel module forms different current channels; and both the first and second channel modules are used for sending pulse signals, through their corresponding current channels, to the micro controlling unit, with cooperation with the upper machine controller, such that the micro controlling unit controls movement of the motor according to the pulse signal. The motor driver as provided in the present invention is compatible with single-ended PTI signals of different voltages.

The invention discloses a self-adaptive optimization control method of a direct current motor system with state constraint, which belongs to the field of automatic control design and application, and comprises the following steps: establishing a direct current motor mechanism model comprising key parameters such as motor armature resistance, inductance and rotational inertia through mechanism analysis; converting the direct current motor system with the state constraint into an unconstrained system; under a backstepping recursion technical framework, a feedforward virtual controller is designed to ensure tracking error convergence and ensure that system operation is always in a safety boundary, and stable operation of a direct current motor system is realized. And based on the reinforcement learning strategy and the approximation capability of the neural network, designing a feedback optimal controller so as to realize the target of energy consumption optimization of the direct current motor system. And a new technical path is provided for efficient and reliable control of the direct current motor under complex working conditions.

The invention relates to a speed-adjustable fan which comprises a fan assembly, a speed adjusting unit and a control unit. The control unit adjusts the rotating speed of the fan assembly based on a signal generated by the speed adjusting unit, the signal generated by the speed adjusting unit is generated based on the operation mode of a user, and the operation mode comprises the operation distance, the operation speed and the operation frequency. By the adoption of the fan, accurate control over the air speed of the fan can be achieved, a user can flexibly adjust the air speed according to needs, and more comfortable use experience is obtained.

The present disclosure relates to a method 300 of operating a motor 230 having a rotary component 234 coupled to a mechanical load 240. The method 300 comprises: determining 310 a fluctuating speed demand corresponding to a temporally varying component of a speed of the rotary component 234; determining 330 a rotary component speed reference value based on the fluctuating speed demand; and controlling 340 the motor 230 in accordance with the rotary component speed reference value. The fluctuating speed demand is determined so as to reduce variations in a total power drawn or provided by the motor 230 in use.

A mover is configured to be electromagnetically propelled along a track in a linear motor track system with a force that is calculated to include compensation for gravity. A multi-axis accelerometer arranged in each segment of the track can detect an orientation or angle of the track segment for determining gravity with respect to the particular section. As a result, if the track is at an incline, such as a ramp, a desired force for moving a mover along the track can be compensated to include gravity due to the incline for achieving a desired motion result. In addition, the detected orientation of the track can be compared to an expected orientation stored by a control program to avoid a loss of performance due to physical changes in the track not matching an expected / programmed configuration of the track.