Gear position identifying device and identifying method thereof for multi-speed motor

Abstract

The invention relates to a gear position identifying device and an identifying method thereof for a multi-speed motor, and the identifying method comprises the following steps: collecting neutral line current of the multi-speed motor through a current sensor, and obtaining an alternating current signal which is proportional to the neutral line current of the multi-speed motor; then rectifying the alternating current signal to a direct current signal through a rectifier circuit; then accessing the direct current signal into an I / V converting circuit, converting the direct current signal to a voltage signal through the converting circuit; and finally accessing the obtained voltage signal into an MCU core module for carrying out state judgment through a built-in identifying program. The identifying method can identify and determine the running state of the multi-speed motor only by collecting the neutral line current of the multi-speed motor and then comparing the current equivalent threshold of the known fixed gear position with the real-time collected value I. The identifying device only needs to be connected with a neutral line of the multi-speed motor, has the advantages of high safety, simple structure, low cost, high identification precision, convenient maintenance, repair and debugging, and can reduce the engineering construction difficulty and be conductive to popularizing the device.

Description

technical field [0001] The invention relates to a multi-speed motor gear recognition device and a recognition method thereof, which are applied to the detection of common zero multi-speed multi-winding motors, such as the detection of the running state of central air-conditioning multi-speed fan coils. Background technique [0002] In the past fifty years, the state has promulgated and implemented dozens of energy-saving policies, design specifications, and energy-saving standards, which have played a very positive role in promoting building energy conservation. However, due to the imperfection of related hardware facilities such as data collection, It is impossible to carry out very effective calculation, evaluation and supervision of the actual situation and implementation effect of the policy. Under the circumstance that the state of building energy consumption is difficult to obtain, it is very difficult to carry out building energy-saving renovation, which not only restri...

AI Technical Summary

Problems solved by technology

[0003] At present, the current detection type multi-speed motor state recognition technology can realize the state detection, centralized monitoring and information processing of the operation status of multi-speed motors or central air-conditioning fan coil units. Take the three-speed motor as an example, it is necessary to collect high, medium and low-grade current signals, the circuit is relatively complex, and the cost is high; due to the need to collect the current of each gear, a three-speed motor needs up to 11 lines (including seven collection lines, two communication lines, and two power lines), the construction cost is relatively high; more collection ports make the device require more interfaces and reduce the integration of the device

[0004] The voltage detection type multi-gear motor state recognition technology uses the motor voltage mutual induction technology to compare the low-grade voltage with the on-site AC voltage to obtain the motor running status, which solves the difficulty of engineering wiring and reduces the difficulty of construction. However, this technology also exists The following shortcomings: the method and device only obtain the output current of the motor in different working states by making the photoelectric isolator work in the linear region, thereby judging the running state of the motor, the reliability is insufficient, and the detection accuracy is low because it relies too much on the photoelectric isolator; The voltage of a certain gear and the live wire are directly connected to the circuit board, which threatens the construction safety of the construction personnel and also reduces the safety and reliability of the device; the voltage is sampled at the motor gear, which may affect the normal operation of the motor; for the device Man-made damage or natural damage lacks certain detection means and management means

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