Cascade speed regulating device for current zero-crossing speed measurement for hardware detection

Abstract

The invention relates to a cascade speed regulating device for current zero-crossing speed measurement for hardware detection. The cascade speed regulating device can realize normal speed regulation energy-saving control by adopting a current zero-crossing detection circuit and a DSP (digital signal processor) processor to acquire the velocity of a winding motor as the outer-loop velocity feedback signal of a double closed loop control algorithm. Since the current zero-crossing detection circuit can acquire the velocity signal of the winding motor indirectly from the rotor current, the cascade speed regulating device circuit is immune to environment, mechanical vibration and so on, and is quick and accurate in measurement, thereby enhancing the system stability.

Description

technical field [0001] The invention relates to a cascaded speed regulating device, in particular to a cascaded speed regulating device for speed measurement at a current zero-crossing point detected by hardware. Background technique [0002] my country is a country with a very short supply of power resources. As an important technical policy, energy conservation has a profound impact on the development of the national economy. Fans and water pumps are widely used in various sectors of the national economy, widely distributed, and consume huge amounts of electricity. According to statistics, the power consumption of fans and water pumps in the country accounts for more than 40% of the electricity consumption of the entire industry, and fans and water pumps generally need to perform load regulation during operation, and the corresponding flow rate must also be tracked and adjusted. The traditional adjustment method is to adjust the valve opening of the inlet or outlet, so th...

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Problems solved by technology

[0005] (2) Closed-loop control type: The main circuit chopper of this type of cascade speed control device adopts closed-loop control, but because its speed is acquired through a magnetic induction proximity switch, it is easily affected by the environment and motor vibration, and pulse loss often occurs Phenomenon, so that the double closed-loop control cannot be realized, which reduces the reliability of the system

[0006] (3) Speed ​​indirect acquisition type: The motor speed in this type of device is not obtained through the proximity switch, but indirectly obtained by calculating the voltage at both ends of the chopper reactor. To calculate, the amount of calculation is very large, which is not conducive to the rapidity of double closed-loop control

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