The present invention relates to a motor control device provided with the function of detecting the rotor position of a synchronous motor in a sensor-less fashion. The motor control device previously stores a current phase β defined by the two parameters that are an induced voltage peak value Ep and the subtracted value (θe−θi) obtained by subtracting an induced voltage electrical angle θe from a current electrical angle θi, and based on the actual detected Ep, θi, and θe, selects β by referring to the β previously stored, and calculates the rotor position θm by subtracting the selected β from the actual detected θi. Then, in case of selecting β, the actual detected Ep and θe are corrected according to changes in the current flowing through the coil. As a result, a detection accuracy for the rotor position during a transition period is enhanced.

Motor Control Device

Provided is a control device for an electric compressor capable of suitably controlling a motor in response to load variations having a complex frequency component even when controlling a motor using a sensorless system. The control device for an electric compressor comprises: a repeating control unit (5) which receives input of the difference in rotational speed between a target rotational speed and an estimated rotational speed of a motor driving the compressor, and which continues to reduce the difference between the rotational speeds by repeating operations using the difference between the rotational speeds from the cycle immediately prior to the current cycle for the compressor; a pressure detection unit (1) for the compressor; and a reset signal generation unit (4) which calculates a timing for one rotation of the compressor by counting the number of prescribed components in the load variations of the compressor on the basis of the pressure value of the compressor, and outputs a reset signal to the repeating control unit (5) in accordance with the timing.

Control device for electric compressor

Systems and methods of controlling the speed of a pump configured to move liquid through a pump system are described. The actual motor speed of the pump motor is controlled by adjusting a current applied to the motor based on the difference between the actual motor speed and the target motor speed according to a gain setting. A first gain value is applied as the gain setting when the difference between the actual motor speed and the target motor speed does not exceed a first threshold. However, a second, higher gain value is applied when the difference between the actual motor speed and the target motor speed exceeds the first threshold.

Dynamic speed control for pump motor

A speed estimation apparatus 101 for an AC motor 2 is characterized by being provided with: a model deviation calculation unit 11 that calculates model deviation on the basis of the voltage, the current, and the estimated angular velocity of the AC motor 2; a first angular velocity estimation unit 21 that calculates a first estimated angular velocity as a low-frequency component including the DC component of the real angular velocity on the basis of the model deviation; a second angular velocity estimation unit 22 that calculates a second estimated angular velocity as the high-frequency component of the real angular velocity on the basis of a specific high-frequency component included in the model deviation; and an adder that adds together the first estimated angular velocity and the second estimated angular velocity, wherein the value obtained by adding the first estimated angular velocity and the second estimated angular velocity is fed back to the model deviation calculation unit as the estimated angular velocity.

Speed estimation apparatus for ac motor, driving apparatus for ac motor, refrigerant compressor, and freezing cycle apparatus

The invention relates to a motor control method and device based on filtering error, wherein, the method comprises the following steps: S21, subjecting the motor feedback speed to first-order speed filtering , and subjecting the command speed to first-order speed filtering; S22, performing a difference operation between the original command speed and the first-order filtered command speed, and summing the result of the difference operation with the first-order filtered motor feedback speed to obtain a summing speed; S23, performing a difference operation between the summing speed and the original command speed, and then transmitting the operation result to the speed loop PID processing module. The apparatus includes a memory, a processor, and a microcomputer program stored on the memory and capable of running on the processor, which performs the method described above when the processor executes the program.

A motor control method and device based on filtering error

An electric motor control device is capable of reducing vibration in a speed fluctuation range at a high frequency. The electric motor control device includes a target rotation speed setting unit that sets the target rotation speed of an electric motor, a rotation speed estimation unit that calculates an estimated rotation speed of the electric motor, and a drive command signal generation unit that generates a drive command signal for the electric motor so as to eliminate a rotation speed difference between the target rotation speed and the estimated rotation speed. The rotation speed estimation unit includes an error calculation unit that calculates an error related to rotation of the electric motor and an estimated corrected rotation speed calculation unit that calculates an estimated corrected rotation speed by taking the error as input and correcting the estimated rotation speed.

Electric Motor Control Device

PROBLEM TO BE SOLVED: To provide a control device for an electric motor that can reduce vibration in a high-frequency speed fluctuation bandSOLUTION: A control device for an electric motor 10 includes: target rotational speed setting means 1 for setting a target rotational speed of the electric motor 10; estimated rotational speed calculation means 12 for calculating an estimated rotational speed of the electric motor; and drive command signal generation means 2-8 for generating a drive command signal of the electric motor 10 to eliminate a rotational speed difference between the target rotational speed and an estimated correction rotational speed The estimated rotational speed calculation means 12 includes: error calculation means 14 for calculating an error related to the rotation of the electric motor 10; and estimated correction rotational speed calculation means 16 for correcting the estimated rotational speed by inputting the error and calculating the estimated correction rotational speed

Control device for electric motor

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Electric Motor Control Device

Control device for electric motor