Motor braking energy is supplied to the control circuit of AC inertia load in real time

Abstract

The invention relates to a control circuit for real-time supply of motor braking energy to an AC inertial load, including a motor main control circuit, a braking energy DC / AC dispatching circuit, specifically including a rectifier module PR1, an IGBT module PM1, a DC / AC module PW1, a motor Control module CU1, AC inertial load AL1, motor M1, encoder PG1, brake tube VT1, voltage sensor VS1, DC / AC module PW1, contactor K1, freewheeling diode D1, rectifier inductor L1, buffer inductor L2, rectifier capacitor C1, buffer capacitor C2. The invention can automatically convert the braking energy of the motor through DC / AC conversion and directly convert it to this kind of AC inertial electric load for power supply. The conversion and utilization efficiency of the braking energy of the motor in the invention is high, the energy saving effect is good, the cost is low, and the application is convenient. High reliability.

Description

technical field [0001] The invention belongs to the field of industrial control, and relates to a circuit, in particular to a control circuit for supplying motor braking energy to an AC inertial load in real time. The occasion where the braking energy of the motor is supplied to the AC inertial load in real time to realize energy-saving control. Background technique [0002] In the production machinery equipment driven by the motor, in order to realize rapid deceleration or stop control of the production machinery, it is necessary to quickly transfer the braking energy of the motor from the shaft. At present, in the motor drive control system based on the power electronic speed control device, the commonly used braking energy processing technologies are: first, the energy consumption method, through real-time monitoring of the DC bus voltage in the speed control device and combined with the system operation command, when When it is judged that the motor is braking, a high-p...

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Problems solved by technology

The disadvantages of the prior art are: 1. The energy consumption method consumes all the braking energy of the motor on the heating of the braking resistor; 2. Although the feedback method can feed back most of the braking energy of the motor to the grid to save energy, The additional active inverter device is large and the investment is high. In the small and medium-capacity motor system, the input and output benefits are low; 3. The supercapacitor storage method is due to the low rated voltage of a single supercapacitor, and the DC bus side voltage is generally lower. High, the supercapacitor bank device combined in series and parallel is large, high in cost, and has limited energy storage

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