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Motor terminal voltage measuring instrument of alternating current frequency conversion motor

A technology of terminal voltage and AC frequency conversion, which is applied in the direction of measurement using digital measurement technology, can solve the problems of large error, high digital sampling frequency, and inability to accurately consider inverter voltage drop, so as to avoid measurement voltage error and improve The effect of controlling performance

Inactive Publication Date: 2014-04-09
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the problems existing in the prior art that if the DC bus voltage is collected, the converted terminal voltage cannot accurately consider the voltage drop of the inverter, the error is large and if the motor terminal voltage is directly measured, due to the PWM square wave It requires extremely high digital sampling frequency and high-speed digital signal processing, which cannot be realized by ordinary controllers. A terminal voltage measuring instrument for AC variable frequency motors is provided.

Method used

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  • Motor terminal voltage measuring instrument of alternating current frequency conversion motor
  • Motor terminal voltage measuring instrument of alternating current frequency conversion motor
  • Motor terminal voltage measuring instrument of alternating current frequency conversion motor

Examples

Experimental program
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Effect test

Embodiment approach 1

[0033] Embodiment 1, the output terminal Vc of the HV-C04 series sensor is connected to one end of the sampling resistor (chip resistor model 0201) with a wire, and the other end of the sampling resistor (chip resistor model 0201) is connected to the American AD company’s model. The Vi pin of the AD574A ADC chip, the R and D ports of the AD574A ADC chip are connected to the IN port of the FPGA, and the sampling resistor (the chip resistor of the model 0201), the ADC chip of the model AD574A, and the FPGA are welded on the same On one circuit board, the output port of the voltage measuring instrument is connected with the input end of the motor controller 4 with a signal line.

Embodiment approach 2

[0034] Embodiment 2, the output terminal OUT of the LV25-P series sensor uses a wire to connect one end of the sampling resistor (chip resistor model 0402), and the other end of the sampling resistor (chip resistor model 0402) is connected to the ADC model ADC0809 The IN0 and IN1 pins of the chip, the D0 port and the D1 port of the ADC chip of the model ADC0809 are connected to the IN port of the FPGA (Field Programmable Logic Gate Array), among which the sampling resistor (the chip resistor of the model 0402), the model of the ADC0809 The ADC chip and the FPGA are welded on the same circuit board, and the output port of the voltage measuring instrument is connected to the input end of the motor controller 4 with a signal line.

[0035] The working principle of the AC variable frequency motor control system using the terminal voltage measuring instrument of the AC variable frequency motor according to the present invention:

[0036] The DC power supply 1 outputs the DC voltage...

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Abstract

The invention discloses a motor terminal voltage measuring instrument of an alternating current frequency conversation motor, and aims to solve the problems that if errors of motor terminal voltages which are acquired by converting collected direct current bus voltages are large or if the motor terminal voltages are directly measured, due to the characteristics of PWM square waves, high digital sampling frequency and high-speed digital signal processing are needed, and an ordinary controller can not meet the requirements. The measuring instrument (5) comprises a sensor, a sampling resistor, an AD sampling module and an FPGA. The input end of the sensor is electrically connected with the output end of an inverter (2), the output end of the sensor is electrically connected with one end of the sampling resistor, the other end of the sampling resistor is electrically connected with the signal input end of the AD sampling module, and the signal output end of the AD sampling module is connected with the input end of the FPGA through an I / O port. The input port of the measuring instrument is electrically connected with the output end of the inverter (2) through the sensor, and the output port of the measuring instrument is electrically connected with the input end of a motor controller (4) through the FPGA (field programmable gate array).

Description

technical field [0001] The invention relates to a measuring mechanism, more precisely, the invention relates to a machine terminal voltage measuring instrument of an AC variable frequency motor. Background technique [0002] With the rapid development of power electronics technology, AC variable frequency motors have been widely used in the industry. In the AC variable frequency motor system, the control algorithm is the core that determines the system performance, and the accuracy of the signal collected by the sensor will directly affect the effect of the control algorithm. Since the terminal voltage of the AC variable frequency motor is in the form of high-frequency and high-voltage PWM, it is currently impossible to achieve real-time measurement by the sensor. Therefore, the industry generally uses voltage sensors to measure the voltage at the input terminal of the inverter (such as figure 1 shown in Vdc) instead of the motor terminal voltage (as shown in figure 1 show...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25
Inventor 袁新枚王闯陈宏羽刁庆华纪淑玲张建陈浩
Owner JILIN UNIV
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