Method and device for determining rotating speed of motor and electronic equipment

Abstract

The invention provides a method and device for determining a rotating speed of a motor and electronic equipment. The method comprises the steps of determining a current under an alpha axis and the current under a beta axis of the motor; determining a voltage of the motor under the alpha axis and the voltage of the motor under the beta axis; determining a back electromotive force under the alpha axis and a back electromotive force under the beta axis of the motor according to the current under the alpha axis, the current under the beta axis, the voltage under the alpha axis and the voltage under the beta axis; and estimating the rotating speed of the motor according to the back electromotive force under the alpha axis and the back electromotive force under the beta axis. The invention provides the method and device for determining the rotating speed of the motor, and electronic equipment, and the rotating speed of the motor can be estimated more accurately.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a method and device for determining the rotational speed of a motor, and electronic equipment. Background technique [0002] Axis error refers to the difference between the estimated value of the position of the motor rotor and the actual value of the position of the motor rotor. Using the axis error, the speed and position of the motor can be estimated. Whether the axis error is accurate will directly affect the estimated motor speed and location accuracy. [0003] In the prior art, the patent application with the application number 201310192101.9 discloses a position sensorless control device and a position detection method. In this solution, the axis error is based on the estimated value of the voltage under the d-axis and the current under the d-axis , the estimated value of the current under the q-axis and the counter electromotive force constant, etc., there are certain err...

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Problems solved by technology

[0003] In the prior art, the patent application with the application number 201310192101.9 discloses a position sensorless control device and a position detection method. In this solution, the axis error is based on the estimated value of the voltage under the d-axis and the current under the d-axis , the estimated value of the current under the q-axis and the counter electromotive force constant, etc., there are certain errors in the voltage under the d-axis, the estimated value of the current under the d-axis, and the estimated value of the current under the q-axis. When calculating the axis error , these errors will make the accuracy of the axis error poor, and the axis error is also affected by the back electromotive force constant, which will also make the axis error accuracy poor, and then, the motor estimated based on the axis error The accuracy of the rotational speed is lower

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