263results 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.

The invention discloses a motor phase current acquisition method and system, and the method comprises the steps: obtaining the duty ratio of a drive signal of a motor drive circuit for one bridge arm in the motor drive circuit; if the duty ratio is greater than or equal to a preset threshold value, recording a first voltage sampling signal when a switching tube of a lower bridge arm in the bridge arms is switched on, and determining a motor phase current according to the first voltage sampling signal; and if the duty ratio is smaller than the preset threshold value, recording a second voltage sampling signal when the switching tube of the lower bridge arm in the bridge arms is switched off, and determining the phase current of the motor according to the second voltage sampling signal.

The invention discloses an automatic zoom lens control system and method, and belongs to the technical field of semiconductor packaging test automation equipment. Wherein the lens module comprises a lens structure assembly and a motor structure assembly, the lens structure assembly comprises a lens, the motor structure assembly comprises a rotor, a coil and a stator, and the rotor, the coil and the lens are rigidly connected together and do axial movement at the same time; the control module comprises an industrial personal computer, a motion control card and a driver, the motion control card and the driver are in communication connection with the industrial personal computer, and the motion control card is used for executing motor motion planning and calculating the output quantity of the position loop improved two-order reduction linear active disturbance rejection controller. According to the automatic zoom lens control system and method, the lens is controlled to zoom automatically, clear images of chips with different heights on the weldment are obtained, and it is guaranteed that the zoom device is high in precision and high in automatic zoom speed while automatic zoom is achieved.

A voice coil motor (VCM) in a hard disk drive is operated in a discontinuous mode with an alternation of on and off times. A drive current to the VCM is facilitated and countered with a variable voltage across the during the on-times and off-times. The intensity of the drive current is controlled as a function of a Back ElectroMotive Force (BEMF) of the VCM. A method includes sampling during the alternation of on-times and off-times first and second values of the voltage across the VCM. The first value is sampled at a first time in response to the end of the off-time. The second value is sampled at a second time in response to the drive current of the VCM zeroing following the supply of drive current to the VCM being countered during the off-time. The BEMF is calculated as a function of first and second values.

The invention provides a voice coil motor control system and method. The voice coil motor control system comprises a voice coil motor, a laser light source, an interferometer, a square wave circuit and a processing unit. The laser light source is used for transmitting a laser signal to the interferometer; the interferometer is used for generating an interference signal based on the laser signal; the square wave circuit is used for generating n square wave signals based on the interference signal and n voltage thresholds; the processing unit is used for acquiring a moment sequence, and traversing each moment from the (2n + 1) th moment of the moment sequence as a current moment; determining a target duration based on the current moment and a reference moment before the current moment; determining a speed feedback value based on the target duration and the reference distance; and the processing unit is used for determining a speed deviation value based on the speed feedback value and the obtained target speed value, and controlling the movement speed of the voice coil motor based on the speed deviation value. According to the technical scheme, the feedback period of the speed feedback value is short, and the accuracy of motion speed control is improved.

The present invention belongs to the field of motors, and particularly relates to a voice coil motor, comprising: a mounting housing; a permanent magnet structure, which is mounted on the mounting housing; a coil mounting structure, which is mounted on the mounting housing; a bearing structure, which is mounted on the mounting housing; an elastic structure, which is mounted on the mounting housing; a fixing structure; and a voice coil motor control system for controlling the parameters of the voice coil motor. By adjusting the fixing structure, the elastic structure can be fixed on the mounting housing after the elastic structure is placed. When the elastic structure needs to be replaced, the elastic structure can be taken out and replaced by adjusting the fixing structure again. Therefore, when the elastic structure is damaged, it is not necessary to replace the whole. Moreover, the bearing structure makes the movement of the coil mounting structure more stable. Through the voice coil motor control system, the control parameters can be automatically adjusted to adapt to the unknown environment and system nonlinearity, improving the system performance and robustness.

DC motor (1) for operation in an external magnetic field comprising: a rotor (2) which is rotatable about an axis of rotation (5) and has at least two windings (10, 11), at least four continuous rotary transformers (3), two rotary transformers (3) being assigned to each of the windings (10, 11) and being designed to supply the respectively assigned winding (10, 11) with direct current, an angle sensor (4) designed to determine the angular position of the rotor (2), and a control unit (15) designed to control the current supply to at least one of the windings (10, 11) as a function of the angular position of the rotor (2), wherein the motor (1) is aligned with an external magnetic field during operation such that the axis of rotation (5) extends transversely to the external magnetic field.

The utility model discloses a building block type development board based on an ARM (Advanced RISC Machines) platform, which is characterized by comprising a core board and an expansion board electrically connected with the core board, and the core board is provided with a minimum system circuit, a USB (Universal Serial Bus) to serial port circuit, a USB functional port circuit and a serial port one-key downloading circuit, the minimum system circuit is respectively and electrically connected with the USB function port circuit and the serial port one-key downloading circuit, the serial port one-key downloading circuit is electrically connected with the USB to serial port circuit, the expansion board is provided with a power supply switching circuit, a voltage conversion circuit and an expansion circuit, the power supply switching circuit is electrically connected with the voltage conversion circuit, and the voltage conversion circuit is electrically connected with the expansion circuit. The size of the development board is reduced, the customization convenience is improved, the expansibility is enhanced, the cost is reduced, an external USB to serial port line and a downloader downloading program are not needed, and the convenience is improved.

The utility model relates to the technical field of electrical control, in particular to a mobile square cabin electrical control box, which comprises a power supply module, a motor driving module, a control module and a connecting module, and is characterized in that the power supply module is respectively connected to the motor driving module and the control module through the connecting module; the power supply module comprises a battery pack, a mains supply access interface, an inverter and a switching power supply, the connection module comprises a power supply interlocking change-over switch, a grounding terminal strip and an air conditioner, the mains supply access interface is connected to the inverter, one path of output end of the inverter is connected with the base station equipment, and the other path of output end of the inverter is connected with the power supply interlocking change-over switch. According to the utility model, through the first interlocking change-over switch and the second interlocking change-over switch, the flexible switching between the commercial power and the power supply of the battery pack is realized, and the working continuity of the mobile square cabin in various environments is improved.

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.

A gas turbine engine having a first pressure spool and a second pressure spool includes a power transfer system to transfer mechanical power between the first pressure spool and the second pressure spool. The first pressure spool can include a first electric machine to convert mechanical power from the first pressure spool to a first electric power. A coupled electric machine having a first coupled rotor and a second coupled rotor can be rotatingly coupled to the first pressure spool and the second pressure spool, respectively. The coupled electric machine is configured to receive an output power (e.g., an output power from an AC / AC converter) to drive a winding of the coupled electric machine to enable power transfer between the first pressure spool and the second pressure spool. An AC / AC converter can be electrically disposed between the first pressure spool and the second pressure spool.

The utility model discloses a rectification adjusting system for an excitation winding of an electric shovel direct current motor, a motor armature Hall current sensor inputs a collected main loop current signal of the electric shovel direct current motor to a CPU control board through a signal interface, and a data processing unit of the CPU control board performs data processing on the main loop current signal; a motor excitation Hall current sensor integrated in the CPU control board collects excitation current signals of an electric shovel motor and carries out data processing through a data processing unit. After data processing is completed, the CPU control panel controls the IGBT rectification circuit module to conduct rectification through the IGBT trigger circuit, the IGBT rectification circuit module is made to conduct sectional type excitation current control in an excavation mode and a descending mode respectively, the purpose of saving electric energy with the best characteristics is achieved, and remote real-time transmission is conducted through the 5G module.

The invention provides a control device capable of improving control accuracy at low cost. The control device is provided with: a prescribed value information storage unit that stores, as prescribed value information, a prescribed value that defines the oscillation frequency of the synchronization signal generated by the command device; a clock signal generation unit that generates a clock signal having a predetermined oscillation frequency; a measured value information acquisition unit that acquires, as measured value information, a measured value obtained by measuring the oscillation frequency of the synchronization signal transmitted from the command device, on the basis of the clock signal; a correction value calculation unit that calculates, on the basis of the prescribed value information and the measured value information, a correction value for correcting the command value information transmitted from the command device; a command value information acquisition unit that acquires command value information indicating a command value for a control object from a command device; a corrected command value calculation unit that calculates a corrected command value obtained by correcting the cycle of the command value information on the basis of the correction value; and a control unit that controls the driving of the control object on the basis of the corrected command value.

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.

The invention relates to a predictive torque management method comprising the following steps: selecting a torque range having an upper boundary torque and a lower boundary torque, the upper boundary torque being selected to be higher than an optimal torque and / or the lower boundary torque being selected to be lower than the optimal torque, the optimal torque is the torque with the lowest oil consumption at a certain engine rotating speed during engine operation; and performing engine torque limiting based on the torque range wherein the engine torque is limited to an upper boundary torque when the torque demand exceeds the upper boundary torque; the engine torque is limited to zero when the torque demand is below the lower boundary torque.

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.

According to the embodiment of the invention, the motor driver comprises a first channel module, a second channel module and a switch module connected between the first channel module and the second channel module, wherein the switch module is used for starting the first channel module and the second channel module according to level signals output by the micro-control unit to form corresponding current channels, and for different level signals, the first channel module forms different current channels, and the second channel module forms different current channels; and the first channel module and the second channel module are used for cooperating with an upper machine controller and sending pulse signals to the micro-control unit through corresponding current channels of the first channel module and the second channel module, so that the micro-control unit controls the movement of the motor according to the pulse signals. The motor driver as provided in the present invention is compatible with single-ended PTI signals of different voltages.

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.

To provide an actuator driver capable of driving an actuator having a plurality of voice coils.SOLUTION: An actuator 120 includes: a movable element 124 including a magnet 122; and a plurality of voice coils L1-L3 arranged in a movable direction of the movable element 124. A controller 230 generates a control signal ctrl. A drive part 220 drives the plurality of voice coils L1-L3 according to the control signal ctrl. The drive part 220 includes a correction unit COMPi corresponding to a voice coil Li and configured to correct the control signal ctrl according to a position detection signal PFB showing a position of the movable element 124. A driver DRi drives the corresponding voice coil Li according to an output ctrl' of a corresponding correction unit COMPi.SELECTED DRAWING: Figure 3

Embodiments provide a method of operating a voice coil motor via a transconductance loop. The method includes detecting an actual value of a supply voltage of the transconductance loop. An offset compensation signal of the transconductance loop is produced as a function of the detected actual value of the supply voltage based on a relationship between offset values and the supply voltage of the transconductance loop. The offset compensation signal is applied to a loop control signal of the transconductance loop. A drive current is applied to the voice coil motor. The drive current is related to a target drive current that is based on the loop control signal.

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.

The embodiment of the invention provides a central control armrest box position control method, relates to the technical field of vehicle control, and can improve the control effect of a central control armrest box. The central control armrest box control system of the embodiment of the invention comprises a brush direct current motor; the gear box is connected with an output shaft of the brush direct current motor so as to execute power transmission and rotating speed adjustment; the screw rod is respectively connected with the gear box and the central control armrest box and is used for transmitting the power of the brush direct current motor to the central control armrest box; and the controller drives the brush direct current motor according to a control signal sent by a user so as to control the movement of the central control armrest box.

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.

The invention relates to the field of motor rotating speed control, in particular to a brush motor rotating speed control method, which comprises a motor detection unit, a rotating speed detection unit, an interface M +, an interface M-and an interface S, the interface M +, the interface M-and the interface S are respectively connected with the three electric brushes, and an included angle between the interface S and the interface M-is greater than 0 degree and less than 60 degrees; the motor detection unit is connected with an interface M + and an interface M-, the rotating speed detection unit is connected with an interface S, the output end of the rotating speed detection unit is connected with a MOTOCH port, and the first output end of the motor detection unit is connected with an IM port; the positions between the interface S and the interface M-and between the interface S and the interface M + are adjusted, so that angles exist between the magnetic field of the interface S and the M + and the M-, the phenomenon that the interface S is located in a commutation area in the rotating process of the rotor, consequently, the M + and the M-are connected, and short circuit occurs is avoided, and the working stability of the brush motor is ensured.

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.

Embodiments described here concern a method to control a direct current motor (50) powered by an alternating supply voltage (Vin), which provides to detect the instant of the zero-crossing of the supply voltage (Vin) and to selectively activate a switch device (11) to power the motor (50) by means of the positive half-waves (Vinl) of the supply voltage (Vin) in order to make it rotate in one sense, and by means of the negative half-waves (Vin2) in order to make it rotate in the opposite sense. The invention also concerns a control circuit (10) for the motor (50).