Simulation device and simulation method for soft start of motor

Abstract

The invention discloses a simulation device and a simulation method for soft start of a motor. According to the invention, a power supply module provides a working power source for a simulation device; a thyristor trigger module simulates a feature of a thyristor; a load module obtains a functional equation of a torque and a load according to speed-torque curve fitting; and a synchronization voltage collection module generates a synchronization signal that is utilized as a reference of a phase-shift control trigger pulse. A phase-shift control module emits a phase-shift control trigger pulse and an open degree of the thyristor is changed by controlling a size of a trigger angle, so that adjustment on an input voltage of the motor is realized; besides, a starting control module receives a detection signal that is from a signal detection module; soft start control is carried out on the motor by controlling the phase-shift control module; and the signal detection module carries out current limiting control by detecting the size of currents of a motor module. The apparatus and the method provided in the invention are suitable for application to simulation of a soft start process of low voltage and high voltage motors; the modeling process is simple and visual; and during the simulation process, a system dynamic changing situation is observed at all times by changing parameters, so that a simulation result has high precision.

Description

technical field [0001] The invention relates to computer simulation technology, in particular to a soft start simulation device and method for a motor. Background technique [0002] Motor soft start simulation: Through computer calculation, quantitatively predict the soft start process of the motor, and provide information on the change of relevant physical variables (grid voltage, motor current, speed, torque, etc.) with time. Whether the motor can be successfully soft-started and the starting conditions need to be accurately calculated and simulated. At present, there are many soft start methods, such as liquid resistance soft start, magnetic control soft start, thyristor soft start, etc. From the comprehensive comparison of starting time, energy saving effect of control methods, etc., the thyristor soft start method is the best, representing the soft start. Direction of development. For electric motors, the frequency of soft starting is often very low. In order to sele...

AI Technical Summary

Problems solved by technology

[0005] Due to the nonlinearity and time-varying nature of the grid, motor and load mathematical models, traditional empirical formulas or manual calculation methods are often quite inaccurate

Some manufacturers use MATLAB, PSIM and other tools to simulate the motor soft start process, but the process of building a simulation model and setting simulation parameters is relatively complicated and requires professional technicians to complete, which cannot be used by ordinary customers.

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