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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16 citations
Patent•
21 Oct 1994TL;DR: In this paper, a dynamic braking system for electric motors in an injection molding machine uses the electric heater bands on the barrel of the injection unit as resistors to dissipate the energy generated by the electric motors during an emergency stop.
Abstract: A dynamic braking system for the electric motors in an injection molding machine uses the electric heater bands on the barrel of the injection unit as resistors to dissipate the energy generated by the electric motors during an emergency stop. This system includes suitable switching circuitry to disconnect the heaters from their normal power source and connect them to the motor windings for the short term dynamic braking function.
16 citations
TL;DR: An electric wheelchair control system is described that offers an increased ease of operation to conventional wheelchair users and makes it possible for persons with severe pathologic hand movements to control wheelchairs in a safe and satisfactory manner.
Abstract: An electric wheelchair control system is described that offers an increased ease of operation to conventional wheelchair users and makes it possible for persons with severe pathologic hand movements to control wheelchairs in a safe and satisfactory manner. The control system is designed so that its characteristics are easily adjusted by the therapist to match the patient's control abilities. Chair acceleration, maximum speed and joystick-position averaging are adjusted by means of plug-in modules. There is only a disconnect relay that is activated when the joystick is grasped or addressed with a mouth stick. This relay functions as a ‘deadman control’ by applying dynamic braking when the joystick is released. The absence of other relays results in noise-free operation. Cruise control is included to permit the drive motors to develop full torque automatically when required, regardless of the joystick position. This control system can be applied to any existing wheelchair that uses two motors for steering/propulsion, provided two batteries are used to provide a +6, 0, −6 or +12, 0, −12V supply. The design focused on portability so that the control system does not interfere with folding the wheelchair.
16 citations
Patent•
17 Jan 2014TL;DR: In this article, a vehicle is equipped with a controller that receives a signal defining a regenerative torque limit, and in response to a fault condition associated with the regenerative limit, generates a replacement regenerative ratio based upon a torque converter open speed to decrease roughness during transitions into and out of regenerative braking.
Abstract: A vehicle includes a powertrain having an electric machine configured to selectively apply regenerative torque to cause deceleration in response to braking demand; the powertrain further including a torque converter configured to decouple the electric machine from wheels of the vehicle. The vehicle is also provided with a controller programmed to, during a regenerative braking event, receive a signal defining a regenerative torque limit, and in response to a fault condition associated with the regenerative torque limit, generate a replacement regenerative torque limit based upon a torque converter open speed to decrease roughness during transitions into and out of regenerative braking.
16 citations
16 Oct 2012
TL;DR: The Train Energy and Dynamics Simulator (TEDS) as mentioned in this paper is capable of modeling modern train operations and equipment, and is an effective tool for studying train operations safety and performance as affected by equipment, train makeup, train handling, track conditions, operating practices and environmental conditions.
Abstract: Train safety and operational efficiency are enhanced by the ability to understand the behavior of trains under varying conditions Under the direction of the Federal Railroad Administration (FRA), a longitudinal train dynamics and operation simulation software — Train Energy and Dynamics Simulator (TEDS) — has been developed TEDS is capable of modeling modern train operations and equipment, and is an effective tool for studying train operations safety and performance as affected by equipment, train makeup, train handling, track conditions, operating practices and environmental conditionsTEDS simulates the dynamics of longitudinal train action and incorporates the dynamic effects of various different types of draft gears and end-of-car cushioning units including mismatched devices coupled together, the transient response of locomotive tractive and dynamic braking effort, as well as a fluid dynamic representation of the air brake system with the capability to model conventional pneumatic and ECP brake systemsThe capabilities of TEDS are described and demonstrated with several examples The validation effort undertaken is described at both the component and system level Comparisons of TEDS simulations of impact tests with the test results are shown to verify the draft gear and end-of-car cushioning unit models The air brake model predictions are verified by comparing brake rack test results to TEDS simulations of braking behaviorCopyright © 2012 by ASME
16 citations