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Motor speed calculating method

A speed calculation and calculation cycle technology, applied in the direction of linear/angular velocity measurement, velocity/acceleration/shock measurement, measuring device, etc., can solve the unsuitable multi-channel input signal processing and parallel computing functions, real-time performance, accuracy and stability Insufficient performance and other problems, to achieve the effect of rich FPGA resources, high practicability and cost performance, and wide pulse frequency range

Active Publication Date: 2012-10-03
ZHUZHOU CSR TIMES ELECTRIC CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to provide a motor speed calculation method, which solves the technical problems of the prior art that the real-time performance, accuracy and stability are not high, and it is not suitable for multi-channel input signal processing and parallel computing functions

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specific Embodiment approach

[0066] A specific implementation of the motor speed calculation method using the above-mentioned motor speed calculation device for calculation, the method includes the following steps:

[0067] S10: A set of speed pulse signal output from the speed sensor of the motor. Pulse input A and pulse input B are input to low-pass filter module 1 for filtering;

[0068] S11: The filtered pulse input A and pulse input B are respectively output to the pulse selection module 2 and the direction determination module 3;

[0069] S12: The direction determination module 3 determines the current speed direction according to the phase difference between the pulse input A and the pulse input B, and outputs the direction signal to the data output module 7; the pulse selection module 2 obtains two pulses from the pulse input A and the pulse input B Select a pulse that is suitable for calculation and output it to the frequency calculation module 4, the zero speed determination module 5, and the du...

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Abstract

The invention discloses a motor speed calculating method, which carries out low-pass filter treatment on pulse input A and pulse input B. Each one of the filtered pulse input A and pulse input B is output in two paths for pulse selection and direction judgment. In the direction judgment, a current speed direction is judged according to a phase difference of the pulse input A and the pulse input B, and a direction signal is output. In the pulse selection, one pulse suitable for calculation is selected from the pulse input A and the pulse input B and is output by dividing into three paths for frequency calculation, zero-speed judgment and duty ratio calculation. In the zero-speed judgment, a zero-speed identifier is output when a current speed sensor has no output pulse. In the frequency calculation, a pulse frequency is processed, calculated and output. In the duty ratio calculation, a duty ratio signal under the current pulse is processed, calculated and output.. With the adoption of the motor speed calculating method provided by the invention, the technical problems that the motor speed calculating method in the prior art has low instantaneity, accuracy and stability, and is not suitable for multipath input signal treatment and parallel calculation function can be solved.

Description

technical field [0001] The invention relates to a control method of a motor, in particular to a speed calculation method of a multifunctional modular motor. Background technique [0002] The current mainstream speed sensors are all pulse type, that is, a set of pulses is used to represent the current rotation speed and direction, and the user needs to calculate the frequency and phase relationship of the pulses to obtain the actual speed and direction. For most of the current controllers, the speed signal is an important key parameter, as long as there is a short-term inaccuracy, it will cause major failures. In the actual application process, the speed signal is often susceptible to interference and has variability, which requires its acquisition and processing method must have real-time, accuracy, stability and anti-interference. [0003] The existing calculation method is to use the pulse capture module of the processor to receive the signal, and calculate the pulse cycl...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P3/481
Inventor 徐绍龙冯江华刘可安倪大成刘良杰董平邱岳峰
Owner ZHUZHOU CSR TIMES ELECTRIC CO LTD
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