Motor rotating speed computing method

A technology of motor speed and calculation method, which is applied in the direction of motor control, electrical components, control systems, etc., can solve problems such as fast response, and achieve the effects of fast response, good stability, and accurate motor speed

Active Publication Date: 2013-03-06
BYD CO LTD
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Problems solved by technology

Although the existing motor rotor calculation method can calculate the motor speed value, since the filter period (N*K) of the motor speed is fixed, it is difficult to make the calculated motor speed in all cases (for example, motor Speed ​​changes too fast or too slow) can achieve accurate and fast response effects

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[0025] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0026] It can be seen from the prior art that the filter period (N*K) used in the current motor speed calculation method is fixed, however, the applicant found that the required ideal filter period is different with the change of the motor speed. Therefore, in order to achieve accurate and fast-response effects of the motor speed under all circumstances (for example, the motor speed changes too fast or too slow), the present invention provides a method for calculating the motor speed, such as figure 1 As shown, the method includes:

[0027] Step A: Calculate the motor s...

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Abstract

A motor rotating speed computing method includes: computing motor rotating speed V1 within each sampling period T, and subjecting the V1 to moving average filtering by the length of K to obtain V2; counting and cumulatively summing the computed V1, and when a counted value i is equal to N, enabling a cumulatively summed value sum of the V1 to be divided by N so as to obtain V3, clearing the i and the sum and repeating the step; and subjecting the V3 to moving average filtering by the length of K so that outputted motor rotating speed V4 is obtained, wherein the N is a positive integer and is updated in real time according to a difference value of the V4 and the V2, an initial value of the N is Nmax, and an initial value of the V4 is zero. By the motor rotating speed computing method, the N is updated in real time according to the difference value of the V4 and the V2, so that automatic adjustment according to motor rotating speed changes is achieved, and further, the computed motor rotating speed can be more accurate and higher in stability and respond to rapid output.

Description

technical field [0001] The invention belongs to the field of motor control, and in particular relates to a method for calculating the rotational speed of a motor. Background technique [0002] As an important parameter of the motor, the speed of the motor, the accuracy of its calculation plays a vital role in the control of the motor. At present, the motor speed is generally calculated by the following method: calculate the angle that the motor rotor has rotated every N sampling cycles (the sampling cycle refers to the time interval between two adjacent acquisitions of the motor rotor position), and calculate the rotated angle Divide by S (the S is equal to the sum of N sampling periods) to obtain a motor speed V, and then perform sliding average filtering on the K motor speeds V sequentially obtained according to the above method to obtain the final motor speed. Although the existing motor rotor calculation method can calculate the motor speed value, since the filter perio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P29/00
Inventor 蓝芝祥汤小华杜智勇
Owner BYD CO LTD
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