Vehicle brake and energy dissipating device for vehicle brake

Abstract

The invention relates to a vehicle brake and an energy dissipating device for the vehicle brake. The brake comprises a DC bus. The dissipating device comprises a dissipating frame formed by a currentcollecting chamber and a protection plate, an inlet and an outlet, and a cooling core assembly. The cooling core assembly comprises forming plates and liquid-cooled braking resistor tubes which are vertically disposed on the forming plates and have two ends communicating with openings of the forming plates. The liquid-cooled braking resistor tubes comprise copper tubes wound with resistance wiresand wiring terminals which sleeve two ends of the resistance wires and are connected to positive and negative ends of a DC bus. The energy dissipating device provided by the invention can also be referred to as a cooling device, the heat dissipation capability of braking resistors can be greatly improved, which means that the thermal energy ( formed by absorbing and converting electrical energy) of the braking resistors is dissipated, and different braking requirements under various conditions of a vehicle are satisfied. During the braking or deceleration of the vehicle, the rapid shutdown ofa motor generates regenerative electric energy, the regenerative electric energy is absorbed by an energy storage component, when the energy storage component is full or fails, the braking resistors convert the regenerative electric energy into thermal energy, finally, the thermal energy is introduced into a cooling liquid through the dissipating device, and therefore, the effect of cooling is achieved.

Description

technical field [0001] The invention relates to an energy dissipation device in the technical field of energy conversion, in particular to a vehicle brake and an energy dissipation device used for the vehicle brake. Background technique [0002] When the vehicle brakes or decelerates, the traction motor runs in the state of power generation, and the DC bus voltage connected to the inverter (brake) continues to rise. When the DC voltage reaches a certain voltage (the turn-on voltage of the braking unit), the power switch tube of the braking unit is turned on, and the current flows through the braking resistor. The braking resistor absorbs the regenerative energy and converts it into heat energy, the speed of the motor decreases, and the DC bus voltage of the inverter decreases. When the DC bus voltage drops to a certain voltage (stop voltage of the braking unit), the power switch tube of the braking unit is turned off. At this time, no braking current flows through the resi...

AI Technical Summary

Problems solved by technology

The heat dissipation process of the braking resistor is the last link, which in turn restricts the whole process of energy conversion, that is, if the braking resistor cannot convert and take away the absorbed heat in time, its temperature rises rapidly and malfunctions, which will directly cause DC The bus voltage continues to rise and burn the motor

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