35results about "Electric motor control" patented technology

Methods, control systems, and information handling systems for controlling at least two actuators are provided. An internal control system sends an input received from the main control system to a first actuator and diverts a portion of the input to a second actuator when an input constraint of the first actuator is reached. The actuators may be throttle valves for heating a hydraulic line. The internal control system includes a cutoff rerouter for implementing the sending and the diverting of the input and an adaptive cutoff controller, e.g., an integral controller, for determining the input constraint of the first actuator. The information handling systems include a determination logic for determining if an input received from the main control system is greater than an input constraint of the first actuator and a diverting logic for diverting a portion of the input to a second actuator when the input is greater.

One aspect of the present invention relates to a driver of a vibrator including: a control section; and an alternating current signal generation section configured to generate an alternating current signal based on an output from the control section, and to apply the alternating current signal to the vibrator, wherein the control section is configured to lower a frequency of the alternating current signal, and to change, after the frequency change, at least one of a voltage ratio and a phase difference of the alternating current signal such that the ellipse ratio of the elliptical motion changes from a first ellipse ratio to a second ellipse ratio, the second ellipse ratio has a larger ratio of a component in a moving direction in the elliptical motion to a component in a direction perpendicular to the moving direction in the elliptical motion than the first ellipse ratio.

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.

A controller that makes an electric motor efficiently operate in accordance with an ambient temperature. The controller includes a machine learning apparatus learning an operating command to the electric motor. The machine learning apparatus includes a status observing part and learning part. The status observing part observes an ambient temperature of an electric motor apparatus and a cycle time of the electric motor as status variables. The learning part learns an operating command to the electric motor in accordance with a training data set prepared based on a combination of the judgment data acquired by a judgment data acquiring part and the status variables.

The invention discloses a safe torque turn-off circuit and system. The safe torque turn-off circuit comprises a power source module, an input module, an execution module and an STO diagnosis module. Double channel redundancy design is adopted in each of the input module and the execution module. Double channel design is adopted in an output passageway, dynamic detection of an output module is realized in a zero vector state, fault accumulation can be prevented, and diagnosis coverage rates can be improved. The double channel redundancy design is also adopted in an input passageway, dynamic monitoring of the input module can be realized via transmission of two channels of test narrow pulses with certain phase difference between the same, and the diagnosis coverage rates can be improved.

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.

Setting of parameters that determine filter characteristics is facilitated. Machine learning of optimizing the coefficients of a filter provided in a motor control device that controls rotation of a motor for a machine tool, a robot, or an industrial machine is performed on the basis of measurement information of an external measuring instrument provided outside the motor control device and a control command input to the motor control device.

The invention provides a dual-sliding mode control based speed regulating system and method for direct torque of a permanent magnet synchronous motor main axis. The speed regulating method comprises the following steps: calculating the torque of the motor main axis according to the difference value of the actual rotating speed of the permanent magnet synchronous motor main axis and the given rotating speed of the permanent magnet synchronous motor main axis as a given value of a PI regulator; detecting the stator current and voltage of the motor main axis by using a sensor, observing the fluxlinkage and torque of the motor main axis under a stator coordinate system, comparing observed values with the torque calculated by the PI regulator and the given flux linkage respectively, obtainingdirect axis voltage and quadrature axis stator voltage by using the difference value through a dual-sliding mode controller, acting on a power switch device on a main circuit inverter through coordinate conversion and SVPWM conversion, and thus realizing direct torque control of the permanent magnet synchronous motor main axis. The speed regulating system is simple in structure, easy to realize and good in robustness, and has the advantages of high torque response speed and small tracking error, so that the stability of the system and the machining precision of parts are improved.

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.

The present invention is applicable to the motor field, and provides a method and apparatus for driving motor and appliance. When a rotor of a motor rotates, a current angle of the rotor is detected at a current moment by using a Hall sensor, a back electromotive force of the motor is detected at the current moment, and a phase current of the motor is detected at the current moment; a target torque coefficient is detected by using a relational model for a back electromotive force and a torque coefficient according to the back electromotive force; a current torque coefficient is detected by using a relational model for a phase current and a torque coefficient according to the detected phase current; and a compensation angle is detected according to a rotor angle compensation model if a difference between the current torque coefficient and the target torque coefficient is outside a first error range; and the current angle is compensated by using the compensation angle, to obtain an adjustment angle; and power supply to the motor is adjusted according to the adjustment angle by using a field orientation technology. Therefore, active power required by the motor to drive a same load torque can be reduced, and a phase current required by the motor is correspondingly reduced.

The present teaching relates to a magnetic sensor residing in a housing. The magnetic sensor includes an input port and an output port, both extending from the housing, wherein the input port is to be connected to an external alternating current (AC) power supply. The magnetic sensor also includes an electric circuit which comprises an output control circuit coupled with the output port and configured to be at least responsive to a magnetic induction signal and the external AC power supply to control the magnetic sensor to operate in a state in which a load current flows through the output port. The magnetic induction signal is indicative of at least one characteristic of an external magnetic field detected by the electrical circuit and the operating frequency of the magnetic sensor is positively proportional to the frequency of the external AC power supply.

A voltage and speed sensitive solid state motor control starting circuit is a RPM voltage sensing circuit for controlling the starting circuit operation of an AC induction motor. The circuit effectively removes the start capacitor from the AC circuit at a predetermined RPM cutout voltage and reengages the start capacitor at a predetermined cut in voltage. The circuit may be installed on an AC induction motor to replace conventional mechanical switches that are used for removing start capacitors from the AC induction motor circuit. The circuit is more simplified and less complex than conventional mechanical switches, while being very efficient.

A system and method for mitigating overvoltage on a DC link of a power converter of an electrical power system connected to a power grid includes receiving a voltage feedback signal from the DC link for a predetermined time period. The method also includes determining a rate of change of the voltage feedback signal during the predetermined time period. Further, the method includes predicting a future voltage value on the DC link as a function of the voltage feedback signal and the rate of change of the voltage feedback signal. Moreover, the method includes controlling the electrical power system based on the future voltage value.

Provided is a control device for a generator-motor including: a control section (111) for controlling a rotary electric machine (12) with use of an inverter (11); and a connection switch section (5) provided between a power source and the inverter, the connection switch section including a change-over contact (51) which is ON/OFF-controllable by the control section and a current reducing resistor (52) which are connected in parallel. The control section performs ON/OFF control of the change-over contact in accordance with drive characteristics of the rotary electric machine so that a drive current that flows when the rotary electric machine operates as a motor falls within a range not exceeding a permissible current value of the rotary electric machine.

The invention relates to a control circuit which serves for security-critical control of a consumer with an inductive load portion, to be connected to a direct voltage source, and a method for failure control. It is in this case assumed that the control circuit has a power driving assembly, a free-wheeling assembly and a reverse-connection protected assembly. In order to increase the probability of failure recognition, this control circuit is extended by a method for failure control. For this purpose the semiconductor switches of the assemblies, each formed by a MOSFET, are individually driven. The different switching statuses are checked by a diagnostic device which processes voltage values to be read out at outputs of the control circuit. In this way failure-free functionality and also possible causes of failure in the control circuit can be diagnosed.

The invention discloses a three-stage synchronous motor rotor position estimation method based on a direct decoupling mode. A main exciter of a three-stage synchronous motor uses single-phase alternating current excitation with constant frequency, and a second harmonic wave generated by a rotating rectifier as a high-frequency signal is indirectly injected into an excitation winding of a main generator, a second-order generalized integrator is used for extracting a high-frequency response signal and an orthogonal signal thereof from current loop output controlled by starting of the main generator, high-frequency sine and cosine signals extracted from a stator side of a main exciter are combined, a decoupling signal synchronous with the high-frequency response signal is generated through analytical operation, a heterodyne method is combined for modulation, and a rotor position angle of the three-stage synchronous motor is estimated. According to the rotor position estimation method provided by the invention, the decoupling signal synchronous with the high-frequency response signal can be accurately generated, the calculation amount is small, implementation is easy, the complexity of a motor control algorithm can be effectively reduced, and the accuracy of the obtained position estimation angle is relatively high.

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.

The invention discloses a method for controlling a motor through a contactless switch, and relates to the technical field of electrical equipment manufacture. A change-over switch is turned to a manual gear, a contactless switch is in a manual control work state, a first button is pressed down to set a 7555 chip to output a high level, a triode is conducted to make a relay coil be closed, a normally open contact of the relay is closed, a bidirectional silicon controlled rectifier is conducted, and the motor is powered on to rotate; a second button is pressed down to reset the 7555 chip to output a low level, the triode is cut off to make the relay coil be powered off and released, a normally open contact of the relay is opened, and the motor is powered off and stops the service; the change-over switch is turned to an automatic gear, and the contactless switch is in an automatic work state; whenever the 7555 chip outputs a high level, the relay is closed, and the motor is started; whenever the 7555 chip outputs a low level, the relay is released, and the motor stops. According to the invention, the problem that when a mechanical switch is closed and opened, a large current is generated, and the power grid is interfered can be solved.

The invention belongs to the field of aviation permanent magnet synchronous motor control systems, and discloses an AD2S1210-based aviation permanent magnet motor rotor position angle redundancy control system and method. The space vector control FOC algorithm unit is used for generating six paths of PWM (Pulse Width Modulation) waves to drive the three-phase bridge type inversion module to be switched on and switched off by collecting armature current, rotor position angle and rotating speed information of the permanent magnet synchronous motor and adopting a rotating speed and current double-closed-loop control strategy, so that the permanent magnet synchronous motor is controlled to reach a target rotating speed or torque; the AD2S1210 rotary transformer decoding chip is used for collecting rotor position angle information and rotating speed information of a rotary transformer coaxially installed on the permanent magnet synchronous motor. The rotor position angle information and the rotating speed information are decoded and then sent to the position angle redundancy control algorithm unit; and the position angle redundancy control algorithm unit is used for judging the received rotor position angle information, outputting a correct position angle signal to the space vector control FOC algorithm unit, converting the received rotating speed information and outputting the converted rotating speed information to the space vector control FOC algorithm unit.

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 a motor control circuit and a brushless direct current motor. The circuit comprises a controller MCU used for outputting a control signal to a driving chip; a driving chip which at least comprises a signal receiving end and a first circuit, wherein the first circuit is connected with a second circuit at an external output end, a target resistor is arranged between the firstcircuit and the second circuit, the target resistor is used for suppressing negative voltage of the first circuit when the power switching device is turned off, and the signal receiving end is used for receiving the control signal; and a power switching device which is used for completing conduction operation or turn-off operation based on the control signal. According to the invention, the technical problem that when the source electrode of the power switch device is connected with the negative voltage, if the negative voltage value exceeds the absolute maximum rated value, the driving circuit and the power switch device are easily damaged and the motor fails in the prior art is solved.

Disclosed are a motor control apparatus and method in an electric power steering (EPS) system for a vehicle. The motor control apparatus of an EPS system for a vehicle includes a temperature sensing unit configured to sense a temperature of a motor controller for controlling the motor in the EPS system and an output control module configured to adjust a motor current, applied from a steering control module of the EPS system to the motor, based on the motor current and the temperature of the motor controller sensed by the temperature sensing unit.