39results about "AC motor control" patented technology

A modular motor controller family comprises a housing. Solid state switches are selected from one of plural switch sizes for controlling a desired voltage and current range. The switches are mounted in the housing for connection between an AC line and motor terminals for controlling application of AC power to the motor. A logic circuit board is mounted in the housing including logic circuitry for commanding operation of the solid state switches independent of the selected switch size. An interface circuit board selected from one of plural configurations is mounted in the housing and includes interface circuitry connected between the logic circuitry and the solid state switches. The interface circuitry is selected to interface with the selected switch size according to the desired voltage and current range.

An electric power-steering controller eliminates steering components from a dynamic state quantity such as a rotation speed signal using a small-amplitude filter for filtering small-amplitude components, and accurately extracts only vibration components which are smaller than the steering components in amplitude, thereby reducing the vibration components through a control operation.

A control device controlling a motor-driven 4WD vehicle, where either of front wheels and rear wheels are driven by an engine and the others are driven by an AC motor, is provided with an electric power generator driven by an engine to generate first three-phase AC power, a rectifier rectifying the first three-phase AC power, generated by the electric power generator, to second DC power and supplying the second DC power to a neutral point of the AC motor; and a first set-up and set-down inverter setting up and converting the second DC power, supplied through the neutral point, to third three-phase AC power. The AC motor is rotationally driven by application of the third three-phase AC power from the first set-up and set-down inverter.

A fan motor speed control circuit is disclosed. The circuit includes a digital/analog converting unit and a driving unit. The digital/analog converting unit takes charge of receiving a pulse width modulation (PWM) signal and converting it into a voltage signal. The driving unit is connected with the digital/analog converting unit in series for receiving the voltage signal, while the driving unit provides a first predetermined voltage level and a second predetermined voltage level as references. The fan motor is kept to run with a low constant rotation speed when the voltage signal level is higher than the first predetermined voltage level, with a full constant rotation speed when the voltage signal level is lower than the second predetermined voltage level, and with a variable rotation speed when the voltage signal level is lower than the first predetermined voltage level and higher than the second predetermined voltage level.

Disclosed is a drive circuit for generating the drive current used to energize the windings of a motor. The drive circuit includes a data processing unit that produces two outputs used to control an H-bridge and generation of the drive current. One output, a commutation signal, controls the timing of generation of drive current. The drive current in turn is determined based on the other output, a speed signal. The speed signal waveform includes blanking portions to avoid occurrences of shoot through in the H-bridge.

A vibration damping apparatus including reference wave production section that produces a reference wave; a fundamental order adaptive algorithm block that calculates fundamental order adaptive filter factors from a vibration detection signal and the reference wave and produces a fundamental order vibration damping current instruction; an amplitude detection section that calculates a peak current value of the fundamental order vibration damping current instruction; and a fundamental order current excess detection section that derives a fundamental order current upper limit value from the fundamental frequency to produce a fundamental order current upper limit excess signal that is output to the fundamental order adaptive algorithm block, which revises the fundamental order adaptive filter factors in a direction in which the vibration damping current instruction is limited within a range.

Inverters have built-in electron thermal time limit characteristics with the aim of protecting against the overload of alternating-current motors, and there is a need for protection that takes into account the actual temperature of the motor. Provided are an inverter and overload protection method having accurate electron thermal energy time limit characteristics that take the actual increases and decreases in temperature of a motor into consideration during overload and under normal load. The power converter is provided with: a rectifier that converts an alternating current into a direct current; a power inverter that converts a direct current into alternating-current electric power with a variable voltage and variable frequency; an alternating-current motor, the speed of which is controlled by the alternating-current power; a current detector that detects the current of the alternating-current motor; and a control unit that controls each of the aforementioned parts according to the current detected by the current detector. The control unit comprises: an adder/subtracter that adds electronically when the alternating-current motor is operating in overload, and when the alternating-current motor is not operating in overload, subtracts a weighting commensurate with the square time product of the current detected by the current detector during overload, from the cumulative value obtained by the addition during overload; and an electronic thermal heat timing unit that stops the alternating-current motor in the event of an overload operation, based on the integrated value in the adder/subtracter and preset electron thermal heat time limit characteristics.

The invention discloses a switched reluctance motor variable winding driving system and an online soft switching method, and belongs to the field of online soft switching. The system comprises a controller, a driving module, a power converter and a variable winding module, the variable winding module provided by the invention can change the connection mode of each coil in the phase winding of theswitched reluctance motor on line. According to the invention, a switched reluctance motor driving topological structure with online winding series-parallel connection switching capability is combinedwith an online soft switching method; through the variable winding module, the connection mode of the phase windings of the switched reluctance motor is changed on line, so that the control of the phase inductance value is realized, and the optimization of the torque performance of the motor at a low speed and the performance improvement of the motor at a high rotating speed are effectively realized; on-line series-parallel connection switching and fault winding removal of a winding coil are carried out by utilizing an interval with zero phase current of the switched reluctance motor, so thaton-line soft switching is realized, and the speed adjustment range and the motor fault tolerance capability are expanded.

The invention discloses a composite sliding mode speed control method and system for a cylindrical permanent magnet linear synchronous motor, and belongs to the technical field of motor control. A terminal attractor is introduced on the basis of an exponential reaching law, and a new sliding mode reaching law is provided. Based on the reaching law, a sliding mode speed controller of the cylindrical permanent magnet linear synchronous motor is established, the convergence speed of the system state can be increased, and the chattering phenomenon can be effectively restrained. Meanwhile, an extended sliding mode disturbance observer is designed and used for estimating system lumped disturbance and providing feedforward compensation for a speed controller, and a composite sliding mode speed control strategy is formed. The cylindrical permanent magnet linear synchronous motor adopts a double-closed-loop control strategy of composite sliding mode speed control and current PI control based on a reaching law and an extended sliding mode disturbance observer. According to the method, the dynamic response speed of the system is increased, the anti-interference capability and robustness of the system are enhanced, and the operation performance and reliability of the motor in a complex working environment are improved.

A circuit for an electrical load comprises a passive transformer, the secondary of which is connected to power cells for each phase according to the transformer tappings. Each power cell comprises a low cost but efficient power factor correction circuit to produce lower harmonics on the transformer.

The invention relates to a ground conveyor with a working hydraulic apparatus, which is powered by a hydraulic pump (33) with pressure medium, wherein the hydraulic pump (33) is driven by an electric pump motor (32). The electric pump motor (32) is provided with a stator having an armature winding (8) and field magnet means, and a rotor (1) of high-permeability soft magnetic material, wherein the armature winding has a pitch proportional to the number of pairs of stator poles (6) of the stator (5), and the field magnet means is used for forming a magnetic flux in the rotational direction by an angle deviating with respect to a magnetic field of the armature winding (8), in particular by 90 DEG when the stator (5) has four stator poles (6), and wherein the rotor has rotor poles (4) with low magnetic reluctance in the orientation of the rotor poles (4).

The invention discloses a high-frequency output AC-AC phase shift frequency conversion circuit, a motor, and a motor control system. The circuit comprises three groups of control switch groups which are connected between a three-phase power input end and a frequency conversion output end. The three-phase power input end is connected with a three-phase power supply, and three frequency conversion output connection ends of the frequency conversion output end are respectively connected with three power connection ends. The input end of each control switch group is connected with a power supply of one phase of the three-phase unit. Each control switch group is provided with three control switches in a parallel manner, wherein the three control switches are sequentially connected. Each frequency conversion output connection end is connected with the output end of one control switch of each control switch group. When each control switch group is connected, the phase shift of the three-phase power outputted by the frequency conversion output end is carried out clockwise or anticlockwise. The beneficial effects of the invention are that the circuit achieves the AC-AC frequency conversion operation (greater than 50Hz), and enlarges the AC-AC frequency conversion speed regulation range; the circuit is convenient to control, is reliable in operation, and also can achieve the operation (greater than 50Hz) in a circulating current system.

In a brushless motor having a stator including armature windings for a plurality of phases, and a rotor including a permanent magnet and being rotatably disposed inside or outside of the stator, an inter-phase induced voltage waveform between two different phases in the armature windings is a trapezoidal waveform formed by superimposing a fifth-order component and a seventh-order component on a first-order fundamental wave. A content rate X(=(α₅+α₇)/α₁) of a total of voltage peak values α5 and α7 of the fifth-order component and the seventh-order component to a voltage peak value α₁ of the first-order fundamental wave is preferably set to a range of 0.01≦X≦0.1, and more preferably to a range of 0.02≦X≦0.09.

The invention particularly relates to a method for switching a vector mode and a scalar mode in high-power motor control, which solves problems that over-current occurs easily in existing high-power motor control, the service life is reduced, and that the reliability of the whole system is poor. The method is characterized comprising the steps that a, when a motor speeds up, the modulation degree is increased to a limitation threshold value M1, and the control mode transits from the vector mode to the scalar mode; b, when the motor speeds down, the modulation mode gets into 3-frequency-division modulation from a square wave mode, then the control mode transits from scalar control to vector control; c, the modulation mode is switched firstly, the modulation degree reduces to acquire the modulation degree M3 as soon as getting into 3-frequency-division, wherein the modulation degree M3=Mmax-Mdelta-Mhyster; and d, after the modulation mode gets into 3-frequency-division, lux linkage gradually decreases to a normal threshold value Phim2, the control mode is switched from scalar control to vector control. The method provided by the invention prolongs the service life of the motor, and shortens the test period at the same time.

The invention provides a switched reluctance motor torque control method and a modular power converter, the input of a rotating speed ring is a set reference rotating speed and a measured actual rotating speed, a rotating speed error is obtained, the rotating speed error is used as the input, and a total reference torque is obtained through PI control; the input of the torque ring is the total reference torque, the actual torque of each phase, the turn-on angle and the turn-off angle, and distributing the total reference torque to each phase by using a torque distribution function to obtain a phase reference torque; according to the numerical value relation between the phase reference torque and the actual torque of each phase, a pulse width modulation control signal is obtained through torque hysteresis, and the pulse width modulation control signal is applied to a corresponding switch tube in the modular power converter to complete control. On-line self-adjustment is carried out on an overlapping angle in a torque distribution function at each sampling moment, torque hysteresis is based on a pulse width modulation algorithm, pulse width modulation signals with different duty ratios and polarities are generated within a hysteresis limit, and free response is avoided.

The invention provides a motor controller (10), a power assembly (800), a control method and an electric vehicle (900), and relates to the technical field of electric vehicles (900). The input end of the motor controller (10) is connected with a power battery pack (30), the output end of the motor controller (10) is connected with a three-phase motor winding of a motor (20), and the motor controller (10) comprises an inverter circuit (101) and a controller (102). Wherein the input end of the inverter circuit (101) is the input end of the motor controller (10), and each phase of output end of the inverter circuit (101) is connected with one phase of motor winding of the motor (20). And the controller (102) is used for controlling the inverter circuit (101) to output current to the three-phase motor windings at the same time, and the current input into each phase motor winding sequentially and alternately reaches preset current. By using the motor controller (10), the heating capability of the motor winding is fully utilized to heat the power battery pack (30), the symmetry and reliability of the motor (20) are ensured, the use of an additional heating device to heat the power battery pack (30) can be avoided, and the occupied space and cost are reduced.

A vibration actuator control device includes a control unit and a driving unit. The control unit outputs a first control signal for controlling driving of a first vibration actuator including a first vibrating body and a first contact body, and outputs a second control signal for controlling driving of a second vibration actuator and including a second vibrating body. The driving unit (i) outputs a first alternating-current voltage in a first plurality of phases set based on the first control signal, and (ii) outputs a second alternating-current voltage in a second plurality of phases set based on the second control signal. The control unit individually sets a phase difference of the first alternating-current voltage based on the first control signal and sets a phase difference of the second alternating-current voltage based on the second control signal, and commonly sets a first alternating-current voltage frequency and a second alternating-current voltage frequency.

The invention discloses a single-direction non-periodic vibration device which comprises two motor supports fixed to a base in a symmetrical mode. A left motor and a right motor are fixed to the two motor supports respectively. A motor shaft of the left motor is connected with a left weld block shaft through a flat key. A motor shaft of the right motor is connected with a right weld block shaft in a transmission mode through another flat key. A left weld part is fixed to one end of the left weld block shaft, a left eccentric block is welded to the outer surface of the left weld part, a right weld part is fixed to one end of the right weld block shaft in an inward mode, and a right eccentric block is installed on the outer surface of the right weld part in a sleeved mode. The invention further discloses a control method using the single-direction non-periodic vibration device for achieving synchronization of the two motors. The device and the method can guarantee robustness of single-direction vibration and generate better material resonance and are higher in compaction efficiency.

The invention relates to a current source converter driven asynchronous motor torque control method and system, and the method is characterized in that the method comprises the steps: adding the output filtering capacitor voltage of a current source converter into a cost function used for predicting torque control on a pre-constructed current source converter driven asynchronous motor model; and determining an optimal switching vector which minimizes the cost function so as to control the output filter capacitor voltage and the output torque of the current source type converter, and carrying out resonance suppression on an LC network formed by the output filter capacitor of the current source type converter and the stator inductance of the asynchronous motor. According to the method, energy oscillation between the filter capacitor and the stator inductor can be effectively suppressed, electromagnetic torque pulsation is reduced, meanwhile, the method has excellent steady-state performance and rapid torque dynamic response, and the method can be widely applied to the field of asynchronous motor torque control.

The invention discloses an IGBT type cascade speed regulation system. The circuit structure is that a motor rotor is connected with a diode uncontrollable rectifier, an alternating current is rectified into a direct current; the diode uncontrollable rectifier matches a rectifier side direct current voltage with an inverter side direct current voltage through a Boost chopper circuit, and regulates the rotation speed of the motor; an inverter used at the inverter side is an IGBT fully-controlled bridge, a direct current is converted into an alternating current, and slip power is fed back to a power grid; and finally the inverter side is connected to a motor stator side through a transformer T1. Correspondingly, the invention also discloses a reactive compensation control method and a control system of the abovementioned system, the robustness is strong, the system power factor can be effectively improved and regulation effects of the rotation speed of the motor are good, and energy and electricity are saved.

The embodiment of the invention discloses a modulation and overmodulation method and device for SVPWM control, relates to the technical field of motor control, and mainly aims to simplify the implementation process of modulation and overmodulation in SVPWM control. The method comprises the steps of determining a projection u*[alpha] of an actual output voltage vector corresponding to a target voltage vector on a horizontal axis in a quadrature axis and determining a projection u*[beta] of the actual output voltage vector on a vertical axis in the quadrature axis according to a modulation region where the target voltage vector is located, wherein different modulation regions have different u*[alpha] and u*[beta] determination rules; and based on the u*[alpha] and the u*[beta], determining duty ratio output of a sector where the actual output voltage vector is located through a plurality of intermediate variables.

A driving device (100), provided with a power converter (2), a magnetic-pole-position-specifying unit (5a), a magnetic-pole-position-specifying unit (5b), a subtractor (8), and a current control unit (6). The power converter (2) supplies electrical power to a main-side synchronous motor (1a) and a sub-side synchronous motor (1b). The decelerator (8) obtains an angle difference (lambda) using the magnetic pole position of the rotor of the main-side synchronous motor (1a) specified by the magnetic-pole-position-specifying unit (5a) and the magnetic pole position of the rotor of the sub-side synchronous motor (1b) specified by the magnetic-pole-position-specifying unit (5b). A magnetic flux current command compensation unit (10) adjusts the absolute value of a magnetic flux current command (id *) on the basis of the angle difference (lambda). The current control unit (6) controls the power converter (2) using a torque current command (iq *) and the magnet flux current command (id *) in which the absolute value has been adjusted by the magnetic flux command compensation unit (10).

A power converting apparatus and a vehicle including the same according to an embodiment of the present disclosure includes a switching element; and a gate drive unit configured to apply a gate driving signal for driving the switching element to a gate terminal of the switching element, wherein the gate drive unit includes: a current source unit including a source current for sourcing current to the gate terminal in a turn-on section of the switching element, and a sink current for sinking current from the gate terminal in a turn-off section of the switching element; a control current for sinking the current from the gate terminal during a partial section of the turn-on section and the turn-off section of the switching element; and a control current controller configured to control an operation of the control current.