Digital thyristor dual-ring direct current speed regulation device

Abstract

A digital thyristor dual-ring direct current speed regulation device belongs to the field of motor control. The digital thyristor dual-ring direct current speed regulation device comprises a digital thyristor, a control circuit, a digital triggering interface, an amplifying circuit, a digital tachometer circuit, a photoelectric encoder, a direct current motor, a keyboard/display circuit, a synchronous transformer, a synchronous circuit and a rectifying circuit. A gate pole of the thyristor is connected with a port of the amplifying circuit. A control circuit port is connected with a digital tachometer circuit port, a keyboard/display circuit port, a synchronous circuit port and a rectifying circuit port. The digital tachometer circuit port is connected with a direct current motor shaft through the photoelectric encoder. The control circuit comprises a single-chip microcomputer 8051, a programmable timing/counting chip, a programmable I/O (input/output) interface expansion chip and an A/D (analog to digital) converting chip. The digital thyristor dual-ring direct current speed regulation device is high in speed regulation range, low in overshoot of current and rotation speed, short in settling time and dynamic recovery time, stable in starting and high in control precision, and floating speed regulation is achieved.

Description

Technical field: [0001] The invention belongs to the field of motor control, in particular to a digital thyristor double-loop direct-current speed regulating device controlled by a single-chip microcomputer. Background technique: [0002] Motor speed regulation refers to changing the speed of the motor by changing the number of stages, voltage, current, frequency, etc. of the motor, so that the motor can achieve higher performance. Motor speed regulation methods include variable pole logarithmic speed regulation method, frequency conversion speed regulation method, cascade speed regulation method, winding motor rotor series resistance speed regulation method, stator voltage regulation speed regulation method, electromagnetic speed regulation motor speed regulation method, etc. . The pole-changing logarithmic speed regulation method has relatively hard mechanical characteristics, good stability, no slip loss, high efficiency, simple wiring, convenient control, and low price,...

AI Technical Summary

Problems solved by technology

The pole-changing logarithmic speed regulation method has relatively hard mechanical characteristics, good stability, no slip loss, high efficiency, simple wiring, convenient control, and low price, but it has step speed regulation, and the step difference is large, so smooth speed regulation cannot be obtained

Frequency conversion speed regulation method, high efficiency, no additional loss in the speed regulation process Wide application range, large speed regulation range, hard characteristics, high precision, but complex technology, high cost, difficult maintenance and repair

The cascade speed regulation method can feed back the slip loss during the speed regulation process to the power grid or production machinery. The efficiency is high, the device capacity is proportional to the speed regulation range, and the investment is low. When the speed regulation device fails, it can switch to full speed operation. , to avoid production stoppage, but the power factor of the thyristor cascade speed regulation is low, and the harmonic influence is relatively large

Winding motor rotor series resistance speed regulation method, simple equipment, convenient control, but the slip power is consumed in the form of heat in the resistance, the mechanical characteristics are relatively soft

Stator voltage regulation and speed regulation method, the circuit is simple, easy to realize automatic control, but the slip power is consumed in the rotor resistance in the form of heat during the voltage regulation process, and the efficiency is low

Electromagnetic speed regulating motor speed regulation method, simple device structure and control circuit, reliable operation, convenient maintenance, smooth speed regulation, stepless speed regulation, no harmonic influence on the power grid, but large speed loss and low efficiency

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