Speed measurement system and method of servo motor

A technology of servo motor and motor speed, applied in the direction of measuring device, linear/angular velocity measurement, velocity/acceleration/impact measurement, etc., can solve the problem that the speed measurement delay cannot be compensated, and achieve the effect of reliable instantaneous speed value

Active Publication Date: 2013-04-17
SUZHOU INOVANCE TECH CO LTD +1
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a servo motor speed measurement system and method for the problem that the above speed measurement method cannot compensate for the speed measurement delay at ultra-low speed

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  • Speed measurement system and method of servo motor
  • Speed measurement system and method of servo motor
  • Speed measurement system and method of servo motor

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Embodiment Construction

[0033] In order to make the object, technical solution and advantages of 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.

[0034] Such as figure 1 Shown is a schematic diagram of an embodiment of the servo motor speed measuring system of the present invention. The servo motor speed measuring system in this embodiment includes an encoder counting module 11, a speed judging module 12, a first speed measuring module 13, and a second speed measuring module 14, the above-mentioned encoder counting module 11, a speed judging module 12, and a first speed measuring module 13 . The second speed measurement module 14 can be integrated into a motor control device (such as a servo drive, etc.) and implemented in combination with ...

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Abstract

The invention provides a speed measurement system of a servo motor. The speed measurement system of the servo motor comprises an encoder counting module, a rotate speed judging module, a first speed measurement module and a second speed measurement module, wherein the first speed measurement module is used for measuring speed by adopting an M/T method when the rotate speed of the motor is greater than or equal to a first threshold value, and outputting a speed measurement result as a speed feedback; the second speed measurement module is executed when the rotate speed of the motor is less than the first threshold value and comprises a first unit and a second unit; the first unit is used for measuring the speed by using a T method and outputting the speed measurement result as the speed feedback; and the second unit is used for predicting the speed of the current sampling period and outputting the predicted speed of the current sampling period as the speed feedback. The invention also provides a corresponding method. According to the speed measurement system of the servo motor, the predicted rotate speed is used as the speed feedback when a rotor runs at an ultra-low speed, and therefore, the instantaneous speed value of a speed control period at a low speed can be relatively reliable.

Description

technical field [0001] The invention relates to the field of servo motor control, more specifically, to a servo motor speed measurement system and method. Background technique [0002] Speed ​​measurement is one of the most basic requirements in industrial control systems. The most commonly used method is to measure the speed of a shaft with digital pulses, and then convert it into linear speed according to the mechanical ratio and diameter. The most typical methods of pulse velocity measurement are frequency measurement (M method) and period measurement (T method). [0003] The M method is to convert the number of pulses per unit time into frequency. Due to the problem of half pulses at the beginning and end of the measurement time, there may be an error of 2 pulses. When the speed is low, because the number of pulses in the measurement time decreases in this method, the proportion of the error will increase, so the M method is suitable for measuring high speed. If you wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P3/481
Inventor 匡两传
Owner SUZHOU INOVANCE TECH CO LTD
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