34results about "Torque ripple control" patented technology

Control device (3) for controlling an electric power steering device (4) which uses a three-phase synchronous motor (2) as a power assistance during a steering operation, comprising the following a rotation position estimation unit (16) that estimates a position of a rotor of the three-phase synchronous motor (2) on the basis of a neutral point potential or a potential of a virtual neutral point of the three-phase synchronous motor (2), and a command signal calculation unit (17) which calculates a command signal to the three-phase synchronous motor (2) on the basis of the position of the rotor which is estimated by the rotation position estimation unit (16), wherein a position signal, detected by a rotary position detector (21) which detects the position of the rotor of the three-phase synchronous motor (2), is input to the control device (3), the command signal calculation unit (17) calculates a command signal to the three-phase synchronous motor (2) either on the basis of the position of the rotor detected by the rotation position detector (21) or the position of the rotor estimated by the rotation position estimation unit (16) and The command signal calculation unit (17) then, when the position signal is abnormal, calculates the command signal to the three-phase synchronous motor (2) on the basis of the position of the rotor, which is estimated by the rotation position estimation unit (16), and wherein Then, when the position of the rotor detected by the rotary position detector (21) generally matches the position of the rotor estimated by the rotary position estimation unit (16), a calculation of the command signal to the three-phase synchronous motor (2) based on the position of the rotor detected by the rotary position detector (21) and a calculation of the command signal to the three-phase synchronous motor (2) based on the position of the rotor estimated by the rotary position estimation unit (16) are exchanged.

To provide a motor control unit capable of effectively suppressing torque ripple even when a torque command value close to the upper limit of an output current is given.SOLUTION: A motor control unit 1 includes: a torque ripple compensation value calculation unit 12 that calculates a torque ripple compensation value 25 for compensating a torque ripple generated on a motor 4 based on an electrical angular velocity 24 and a torque command value 21 of the motor 4; a ripple amplitude upper limit calculation unit 14 that calculates a ripple amplitude upper limit 27 as the upper limit for the amplitude of the torque ripple compensation value 25 based on the torque command value 21 and the torque upper limit 26 set for the motor 4; and an amplitude adjustment unit 15 that adjusts the amplitude of each frequency component in the torque ripple compensation value 25 based on the ripple amplitude upper limit 27 and calculates a torque ripple compensation value 28 after amplitude adjustment.SELECTED DRAWING: Figure 1

This invention discloses an anti-interference commutation control method and system for a brushless DC motor, belonging to the field of motor control technology. The method includes: S1. Acquiring historical commutation time intervals of the motor and predicting the motor speed and the theoretical time of the next commutation based on the historical commutation time intervals; S2. Using the predicted theoretical time of the next commutation as the time anchor point, opening an adaptive sampling window in advance, wherein the opening time and duration of the adaptive sampling window are calculated based on the predicted motor speed and the theoretical time of the next commutation; S3. During the opening of the adaptive sampling window, activating the acquisition, latching, and state determination of Hall signals; S4. If a valid transition of the Hall signal is captured in step S3, performing a commutation operation based on the valid transition; and closing the adaptive sampling window after the commutation operation is completed. This invention ensures the dynamic response performance and operational stability of the motor across the entire speed range through active interference avoidance in the time dimension.

A method for compensating for current harmonics caused by parameter imbalance in a synchronous motor drive is disclosed. The method includes receiving a command current signal corresponding to a generated command current. The method also includes receiving a position estimate signal indicative of an estimated position of the synchronous motor drive, and determining a voltage adjustment value using the command current signal and the position estimate signal in response to at least one current harmonic caused by parameter imbalance. The method also includes generating a voltage adjustment signal using at least the voltage adjustment value, the voltage adjustment signal being applied to the synchronous motor drive to compensate for the current harmonics caused by parameter imbalance.

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.

This invention discloses a method and control system for suppressing torque ripple in a direct-drive motor of a washing machine. The method includes: using the motor's input speed and real-time speed as the output value of a speed PI controller to obtain a first reference current; using the current motor Hall value, the first reference current, and the real-time current as the output value of a current PI controller to output a compensating electromotive force; obtaining a reference voltage based on the first reference current and the compensating electromotive force; comparing the reference voltage with the motor's rated voltage to obtain the duty cycle; outputting a pulse width modulation (PWM) signal based on the duty cycle; and processing the PWM signal to output a feedback signal to control the motor's output voltage. By employing a dual-closed-loop PI control method, the real-time speed and real-time current of the motor are used for feedback PI control to adjust the motor's input voltage, thereby reducing torque ripple caused by three-phase current fluctuations after load changes, improving the washing machine motor control system's anti-interference capability against load changes, and stabilizing the motor's output torque.

This invention discloses a dynamic speed control system based on the speed feedback of a permanent magnet synchronous motor, relating to the field of motor speed control technology. It includes: a data acquisition module for acquiring three-phase stator current data, raw physical speed feedback data, and stator voltage command data of the motor, and inputting the stator voltage command data into a preset motor mathematical model to obtain model-estimated speed data; and a real-time deviation calculation module for calculating the real-time deviation divergence between the raw physical speed feedback data and the model-estimated speed data, obtaining residual fluctuation based on the three-phase stator current data, and mapping the real-time deviation divergence and residual fluctuation to obtain a dynamic feedback reliability factor. Its beneficial effects include reducing the fluctuation of the speed loop output torque current, extending the mechanical life of the motor, and improving the overall energy efficiency stability of the system.

The invention discloses a non-inductive control method for a brushless direct current motor of a circuit breaker, and the method comprises the steps: obtaining a relation between a moment corresponding to a first rising edge in each period of a PWM signal of any one of three phases of the brushless direct current motor and a moment corresponding to a first rising edge in each period of a commutation signal of the phase; the commutation signal of the phase is constructed based on the relation and the commutation signal high level duration time, the brushless direct current motor is controlled according to the constructed three-phase commutation signals, and compared with the prior art, the method has the technical effects that the phase delay problem caused by a filter does not exist; the full-speed-domain performance is excellent, and the low-speed loading capacity is similar to that of a scheme formed by position sensors such as HALL; wiring is simple and reliable, and position detection precision is high.

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 variety of methods, controllers and electric machine systems are described that facilitate pulsed control of electric machines (e.g., electric motors and generators) to improve the machine's energy conversion efficiency. Under selected operating conditions, the electric machine is intermittently driven (pulsed). The pulsed operation causes the output of the electric machine to alternate between a first output level and a second output level that is lower than the first output level. The output levels are selected such that at least one of the electric machine and a system that includes the electric machine has a higher energy conversion efficiency during the pulsed operation than the electric machine would have when operated at a third output level that would be required to drive the electric machine in a continuous manner to deliver the desired output. In some embodiments, the second output level is zero torque.

A method for balancing the cogging torque of an electrical machine with permanent magnet rotor and slotted stator and corresponding electrical machine with balanced cogging torque. According to the method, the actual angular width of magnetic pole shoes of the rotor of the electrical machine is found from the equation Θm=k·Θme, where k is a correction factor taking account of edge effects with value 0.8 . . . 1.1, and Θme is effective angular width of the magnetic pole shoes of the rotor, determined from the equation Θme=(Q−1 / 2)Θsp, where ΘSp is stator pitch angle and ΘSp=360° / S and Q is the ratio of the number of slots S and the number of magnetic poles P and an integer, Q=S / P. The value of the correction factor k taking account of the edge effects is determined by modeling the construction of magnetic circuit of the electrical machine with a finite element method.

This servo motor control device comprises a torque command correction unit that uses a current to be applied to a three-phase AC motor, and a combination of the phase and the amplitude of a correction amount for cancelling a torque ripple generated when the current is applied to the three-phase AC motor and applies the correction amount to the current, to suppress the generation of a torque ripple.

An electric machine controller arranged to direct a power converter to cause a pulsed operation of an electric machine in selected operational ranges to deliver a desired output and to cause a continuous operation of the electric machine in selected operational ranges is provided. A ramp generator is adapted to provide a ramping between the pulsed operation and the continuous operation.

The application relates to an encoder filtering method, a motor and an automatic curtain. The method comprises the following steps: acquiring an original angle signal of an encoder once every preset time interval to obtain an original angle signal sequence; converting the original angle signal sequence into a continuous angle signal sequence; filtering the continuous angle signal sequence; and obtaining a corrected angle value based on the filtered continuous angle signal sequence. The method can improve the accuracy of the rotor angle signal.

The invention relates to a steer-by-wire steering system for a motor vehicle, having an electric motor for indirectly or directly displacing a steering rod, wherein the electric motor is designed as a high-cogging-torque motor and has an electric machine with a predefined number of phases and an inverter which is in effective connection thereto and has an intermediate circuit capacitor, wherein the inverter is designed as an inverter with an integrated step-up converter. The invention also relates to an electric motor having an inverter with an integrated step-up converter.

The application discloses a kind of full-automatic hardware intervention method and device of pulse width modulation signal, method includes: S1, the extreme point of triangular carrier signal is set as absolute center;S2, by bottom hardware logic gate, an absolute symmetrical time execution window is automatically demarcated to two sides of absolute center;S3, when the count value enters time execution window, bottom hardware logic gate is configured to ignore current main duty cycle setting and carry out forced operation, for the level of PWM output channel is set or cleared;S4, carry out hardware level automatic flip: in successive PWM period, carry out hardware level automatic flip, for in fundamental center seamless superimposed alternating high-frequency square wave signal.The application introduces independent physical execution window and polarity automatic flip mechanism in the bottom digital logic of microcontroller timer, realizes high-frequency alternating voltage injection and accurate waveform clipping under zero CPU computing power consumption, completely eliminates phase distortion and risk of magnetic bias.

A motor control method for domestic appliances for reducing noise during use of the domestic appliances including laundry machines and kitchen machines. The method obtains a cancellation signal configured to reduce the noise of the domestic appliance, and combines this with the motor control signal configured to control the speed of the motor to form a combined signal, the combined signal is then applied to the motor. The signal parameters of the cancellation signal including any one or more of frequency, phase and amplitude are selected for noise cancellation.

The invention relates to a method for regulating a current (i d *, i q *) in an electric motor (2), wherein existing harmonic components (D) of the current (i) are damped d *, i q *) harmonic voltages are injected, which are other harmonic components in the current (î d z -1 -i d , î q z -1 -i q ) which lead to a damping or change of these real harmonic currents, whereby the harmonic voltages to be injected, which the other harmonic components (î d z 1 -i d , î q z -1 -i q ) are determined from a control signal (J) for the motor (2) or for an inverter (3) controlling the motor (2) and a reference value (E) and are added to the control signal (J).

This invention discloses a zero-sequence component injection DPWM modulation method for driving a dual Y-shift 30° six-phase permanent magnet synchronous motor. The method involves superimposing a sinusoidal modulation wave with a zero-sequence component to form a 60° clamping discontinuous modulation wave. The steps include: S1: Obtaining the six-phase voltage modulation wave and its output current; S2: Taking three-phase windings with a 120° phase difference as one group and three-phase windings with a 30° electrical phase difference from the previous group as another group, obtaining the minimum absolute value of the voltage modulation wave and the maximum absolute value of the corresponding output current in each group; S3: Calculating the injected zero-sequence component in each group; S4: Superimposing the zero-sequence component onto the corresponding voltage modulation wave to obtain a DPWM modulation wave that adaptively clamps the maximum conduction current. This invention determines the optimal clamping region by detecting the inverter output current and reference voltage, reducing system switching losses. The zero-sequence component injection method avoids complex vector calculations, demonstrating significant application value.

In some implementations, a synchronous electric machine may include multiple virtual poles and a control device. The control device may control magnetic polarities of the multiple virtual poles to create a set of effective poles. Each effect pole, included in the set of effective poles, includes one or more virtual poles of the multiple virtual poles. The control device may apply one or more input signals to the one or more virtual poles to generate a rotating magnetic field at an applied frequency.

The invention relates to a method (100) for providing a compensation variable in an optimized manner in order to compensate for a synchronous fluctuation of an electric machine, having the following steps: in a first step (105), receiving sensor data by means of a sensor unit in a first cycle time T1 and transmitting the received sensor data to an electric machine control unit in the first cycle time T1; in a second step (110), transmitting the sensor data from the electric machine control unit to a control unit in a second cycle time T2; in a third step (115), processing the sensor data by means of the control unit in the second cycle time T2, wherein in the third step (115) the control unit is designed to approximate the compensation variable (315) from the sensor data for a compensation interval; in a fourth step (120), transmitting the processed sensor data from the control unit to the electric machine control unit in the second cycle time T2; and in a fifth step (125), analyzing the processed sensor data by means of the electric machine control unit on the basis of the third step (115) and current sensor data in the first cycle time T1 in order to provide the compensation variable (315), wherein the compensation value can be determined by the electric machine control unit in the first cycle time T1.

This disclosure relates to a method and system for estimating motor rotor position based on distillation learning and multi-observer fusion, aiming to solve the problems of low rotor position estimation accuracy in the low-speed range and the abrupt change in estimated angle during algorithm switching. In this method, different position estimation methods are employed for the motor speed. A neural network observer is used in the low-speed range; a back EMF observer based on neural network compensation is used in the medium-speed range; and a back EMF-based observer is used in the high-speed range. The neural network observer is trained through distillation learning to improve position estimation accuracy. A fusion weight generation network outputs dynamic fusion weights in real time, and the outputs of adjacent algorithms are weighted and fused within the algorithm switching interval to ensure no angle jump during switching. This invention achieves smooth switching between low, medium, and high-speed domains, taking into account the characteristics of different algorithms, and achieves a prediction accuracy of ±4° at 3.3% of rated speed.

The invention relates to a method for controlling a drive system (M) comprising a turbine engine (TM) coupled to an electric machine (MEL), an electronic control unit (20) for controlling the drive system connected to a power converter (12) for driving the electric machine selectively in engine mode and in generator mode from a reference torque filtered in an auto-adaptive manner so as to exclude a range of excitation frequencies of at least one torsional mode of the drive system according to stator phase voltages of a permanent magnet alternator driven by the turbine engine. The invention also relates to a corresponding drive system and an aircraft including such a drive system.

Providing core synchronization for linear generators. [Solution] A system and method for controlling two or more linear generators are provided, each operating according to repeating behavior so as to form a cycle. The control system utilizes a control circuit network to determine a desired phase offset between the operating cycles of a first linear generator and a second linear generator among the two or more linear generators. During operation, the actual phase offset between the first linear generator and the second linear generator is determined. The control circuit network of the control system is used to modify the operation of at least one of the first or second linear generators to achieve a desired phase effect.

The application relates to a double-vector cascade type torque flux linkage control method of a permanent magnet synchronous motor, and belongs to the technical field of motor control. The method comprises the following steps: calculating a stator flux linkage and motor electromagnetic torque, extending an alternative voltage vector, and decomposing the electromagnetic torque into active torque and reactive torque through motor instantaneous power theory; the optimal voltage vector is selected as the voltage vector corresponding to the minimum value through two-stage active torque value function calculation and one-stage flux linkage value function calculation. The application can quickly and accurately calculate the voltage vector which makes the torque and flux linkage error zero at the same time, successfully eliminates the weight factor without corresponding calculation theory in the value function, realizes the control of the torque and flux linkage of the permanent magnet synchronous motor, avoids the torque pulsation problem caused by flux linkage coupling, and the calculation and synthesis of the voltage vector are relatively simple.

This invention discloses a brushless DC motor driving method based on an inductorless boost topology, comprising: connecting an inductorless front-end circuit topology to a three-phase bridge inverter circuit and a brushless DC motor to form a brushless DC motor system driven by the front-end circuit topology; setting four types of switching vectors according to the circuit structure of the front-end circuit topology and the operating characteristics of the brushless DC motor; different voltage requirements exist during the commutation and non-commutation stages, and the usage and duration of different switching vectors are determined according to the corresponding voltage requirements; and determining the size of the capacitors and their internal resistances in the front-end circuit topology according to the power supply requirements. This invention enables the brushless DC motor to maintain stable torque across the entire speed range, thereby achieving excellent control performance.

A control system and method for mitigating driveline torque spikes in an electric vehicle are contemplated. These driveline torque spikes can be mitigated with a motor spike torque command that is generated in response to a wheel acceleration of a wheel of the vehicle exceeding a spike threshold. The motor spike torque command can be structured for controlling an electric motor of the vehicle to mitigate a driveline torque spike in a driveline structured to connect the motor to the wheel.