DC motor soft starter supplied with power by storage battery

Abstract

The invention relates to a DC motor soft starter supplied with power by a storage battery, which has high accuracy, adjustable starting time and frequency, automatic voltage stabilization, no starting current impact, energy conservation and no phenomenon of contact sintering, and does not affect the normal work of other loads. The DC motor soft starter comprises an LCD display and keyboard module, an integrated control module and a DC motor power supply box, wherein the integrated control module is connected with the DC motor power supply box, and the LCD display and keyboard module is in two-way communication with the integrated control module; the integrated control module comprises a microcontroller module, a voltage-current signal sampling module and an IGBT driving module, wherein the voltage-current signal sampling module is used for sampling the voltage and the current of the DC motor power supply box and an absorbing circuit in real time and sending the samples into the microcontroller module; the microcontroller module is sequentially connected with a PWM auxiliary circuit, a driving circuit and the IGBT driving module, and the IGBT driving module is connected with the absorbing circuit and the DC motor power supply box; the driving circuit is connected with the absorbing circuit which is connected with the microcontroller module; and a power supply device is used forsupplying power for the modules.

Description

technical field [0001] The invention belongs to the technical field of electric power electronic control, and in particular relates to a DC motor soft starter powered by a PWM modulated storage battery, which can realize the speed regulation of a DC motor with a power of 3.7KW-55KW. Background technique [0002] The traditional way of starting a DC motor is to use a DC contactor to switch the resistance, that is, a high-power resistor is connected in series in the armature circuit of the DC motor. When the motor is started, the starting current of the motor is limited by reducing the voltage of the resistor. Or when the rotational speed reaches the expected value, the resistor is bypassed through the DC contactor, and the resistor no longer plays any role, and the DC motor works normally through the bypass circuit. The advantage of this method is that the circuit is simple and the cost is low. The disadvantages are: the speed regulation index is not high, the speed regulati...

AI Technical Summary

Problems solved by technology

The disadvantages are: the speed regulation index is not high, the speed regulation range is not large, and the smoothness is not good; the motor is prone to sudden changes in current when starting, so that it will affect the DC working system; the DC contactor will produce contacts after multiple uses Sintering phenomenon

GTR saturation voltage drops, high current density, but large drive current; MOSFET drive power is small, fast switching speed, but large conduction voltage drop, low current density

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