Topic
Dynamic braking
About: Dynamic braking is a research topic. Over the lifetime, 3472 publications have been published within this topic receiving 34897 citations. The topic is also known as: Rheostatic brake.
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11 Apr 2011TL;DR: In this article, the utilization adhesion coefficients of front and rear axles were calculated respectively with the paralleled-hybridized braking control strategy under different braking intensity, according to front wheel drive and rear-wheel drive in the electro mechanical hybrid braking system.
Abstract: Regenerative braking makes the braking stability of electric vehicles change when it recovers the braking energy of vehicles. The calculation models were established for electric braking force, electric braking torque and utilization adhesion coefficients of front axle and rear axle, aiming at the electro mechanical hybrid braking system composed of electric braking and conventional mechanical friction braking. The utilization adhesion coefficients of front and rear axles were calculated respectively with the paralleled-hybridized braking control strategy under different braking intensity, according to front-wheel drive and rear-wheel drive in the electro mechanical hybrid braking system. The calculation results indicate that rear-wheel drive is not suitable for electro mechanical hybrid braking system from the perspective of energy recovery and braking stability. For front-wheel drive of electro-mechanical hybrid braking system, front-axle is always locked ahead of rear-axle no matter what the electric motor is working at the constant power braking area or constant torque braking area, and the braking stability is preferable. However, the front wheels are locked between times when braking intensity is weak. This case could be improved by adjusting the electric braking force in order to meet the requirements of braking stability of ECE regulation.
11 citations
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TL;DR: In this paper, the authors provide an experimental and theoretical discussion on dynamic braking for a medium-voltage induction motor fed by a modular multilevel double-star chopper-cell (DSCC) inverter.
Abstract: This paper provides an experimental and theoretical discussion on dynamic braking for a medium-voltage induction motor fed by a modular multilevel double-star chopper-cell (DSCC) inverter. It is intended to apply the motor drive to large-capacity fans and compressors with a large moment of inertia. Each chopper cell consists of a bidirectional chopper and a braking chopper connecting a single small-rated braking resistor in series with a single IGBT. This configuration results in a “distributed” dynamic brake that provides a distinctive welcomed side effect of protecting all the bidirectional-chopper cells against sudden overvoltage. An experimental system rated at 400 V and 15 kW is designed, constructed, and tested to verify operating performance of the distributed dynamic brake. Experimental waveforms, along with simulated waveforms, confirm firmly that the distributed dynamic brake is feasible and effective in an induction motor fed by a medium-voltage high-power DSCC inverter for fans and compressors. Finally, this paper gives a design example of a distributed dynamic-braking resistor for the 11-kV, 12-MW induction motor driving a large-capacity fan equipped with a large moment of inertia.
11 citations
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03 Mar 2005
TL;DR: In this paper, a coordination controller that can control fluctuations of the decelerating speed, that is generated when the friction braking of wheels is started during the coordination control of a brake with a combination system is proposed.
Abstract: PROBLEM TO BE SOLVED: To provide a coordination controller that can control fluctuations of the decelerating speed, that is generated when the friction braking of wheels is started during the coordination control of a brake with a combination system. SOLUTION: In achieving target braking torque Tdcom that increases with the rise of master cylinder liquid pressure Pmc, it is achieved only by regeneration torque Tmcom of front wheels initially. During an instantaneous period of time from t1 to t2, when deviation becomes a set point Tm1 between Tmcom and permissible maximum regenerative braking torque Tmmax, a rear wheel friction braking torque Tbcomr is started slowly, by preliminarily increasing the pressure of non-regenerative wheels (rear wheels) whose friction braking should be started. The Tmcom is corrected, only by a portion of the braking torque accompanying this to compensate the target braking torque Tdcom. During an instantaneous period of time from t3 to t4, when deviation becomes a set point between a command value of basic rear wheel liquid pressure braking torque and target rear wheel braking torque, based on the ideal distribution of front and rear braking forces, front wheel friction braking torque is started slowly, by preliminarily increasing the pressure of regenerative wheels (front wheels) whose friction braking should be started. Tbcomr is corrected by only the portion of the braking torque that accompanies this and compensates the target braking toque Tdcom. COPYRIGHT: (C)2006,JPO&NCIPI
11 citations
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09 Feb 1978TL;DR: In this article, the heat energy dissipation capacity of the provided dynamic braking resistors for a given transit vehicle is established and then the generated motor current supplied to those resistors by the regenerating propulsion motor of the vehicle during the brake mode of operation is controlled to limit as desired in accordance with that capacity the total energy dissipated by the dynamic braking resistor.
Abstract: The heat energy dissipation capacity of the provided dynamic braking resistors for a given transit vehicle is established and then the generated motor current supplied to those resistors by the regenerating propulsion motor of the vehicle during the brake mode of operation is controlled to limit as desired in accordance with that capacity the total energy dissipated by the dynamic braking resistors.
11 citations
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30 Oct 1997TL;DR: In this article, an instability value representing the vehicle stability round corners, the transverse acceleration of the vehicle, the coefficient of friction of the road surface, the limitation of braking effect of the driving wheels taking account of transverse accelerations and the coefficients of friction, and the desired throttle setting corresponding to the limit of engine braking torque were evaluated.
Abstract: The system is for a vehicle with front and rear wheels in pairs, one pair at least being driven by the engine. Evaluation is made of an instability value representing the vehicle stability round corners; the transverse acceleration of the vehicle; the coefficient of friction of the road surface; the limitation of braking effect of the driving wheels taking account of transverse acceleration and the coefficient of friction of the road surface; the limitation of engine braking torque taking account of the limitation of the driving wheel braking effect and the instability value; and the desired throttle setting corresponding to the limitation of engine braking torque. Throttling of the engine is then eased to the desired value where it is more severe than the latter.
11 citations