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.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, a microcomputer-based speed controller for squirrel-cage induction motors for lift drives is presented, designed as a replacement for the classical analog versions, achieving appropriate speed control by phase-cut stator voltage control and by dynamic braking with DC current injection.
Abstract: A microcomputer-based speed controller for squirrel-cage induction motors for lift drives is presented, designed as a replacement for the classical analog versions. The appropriate speed control is achieved by phase-cut stator voltage control and by dynamic braking with DC current injection. Both actions are implemented by standard analog phase-control integrated circuits and 8-bit D/A (digital-to-analog) converters. A speed feedback signal is generated by a noisy tachogenerator, so that a low-pass antialiasing filter, followed by a true-averager circuit, is involved for proper signal conditioning. The true averager provides high rejection of the mains frequency and its higher harmonics. The built-in self-test routines and associated circuitry provide part-by-part testing of the hardware. This together with simple diagnosis, supports faster installation and more efficient troubleshooting. Complete firmware is organized in the shape of interrupt-driven routines, which are reentered at every mains zero crossing in the positive direction. A reference-speed profile with the shape of parabola is used to achieve a constant acceleration-time gradient. A discrete proportional integral (PI) control algorithm with lag-lead frequency compensation gives acceptable control accuracy, stability and robustness. >
12 citations
Patent•
04 May 1973TL;DR: In this article, the ratio of the speed of a low speed wheel with respect to a high speed wheel was used to determine when the brake pressure should be increased or decreased. But the ratio was not considered in this paper.
Abstract: An adaptive braking system in which the speed of each wheel on an axle is independently sensed but the braking pressure of both axle wheels is controlled during adaptive braking by a single brake pressure modulator. Performance information from the wheel having the higher speed is used to determine when brake pressure should be reduced. Performance information from the wheel having the lower speed is used to determine when the brake pressure should be subsequently increased. If the ratio of the speed of the low speed wheel with respect to the speed of the high speed wheel drops below a predetermined level, the wheel having the higher speed controls adaptive braking.
11 citations
01 Feb 2019
TL;DR: Hardware implementation is carried out in the laboratory environment to inspect the response of the system which is quite satisfactory and a control circuit and timer methodologies are proposed in this paper.
Abstract: This paper proposes an investigative study on DC motor braking system. Electro-magnetic relay and timer are deployed for this purpose in DC shunt motor. Plugging and dynamic braking systems are implemented to control the speed as well as brake the motor. However, a control circuit and timer methodologies are proposed in this paper. Hardware implementation is carried out in the laboratory environment to inspect the response of the system which is quite satisfactory.
11 citations
Patent•
07 Mar 2007
TL;DR: In this article, a dynamic braking toque detection device consisting of an electronic pulse counting unit, a rotary pulse coder and a coupling is used to detect the dynamic braking distance of any type tractor-type elevator.
Abstract: An elevator dynamic braking toque detection device consists of an electronic pulse counting controlling unit, a rotary pulse coder and a coupling, which is connected with relevant parts of the detected elevator equipments via a conductor and the coupling. The electronic pulse counting controlling unit is positioned inside a special instrument box, the input interface of the electronic pulse counting controlling unit is connected with the rotary pulse coder via the conductor and the output interface is connected with the electric-control system of the detected elevator; the rotary pulse coder is mechanically connected with the rotary shaft side of the elevator tractor via the coupling, the coupling is suitable for the rotary shaft diameter, installation parts and connection way of any elevator tractor. The detection device is able to display the detected pulse value through the digital monitor, is able to detect the dynamic braking distance of any type tractor-type elevator and could display a precise detection value to provide correct foundation for the judgment of the elevator braking torque.
11 citations
TL;DR: In this paper, a 15th order knowledge model from the functioning equations for CAD and a 2nd order representation model for control is presented for a semi-trailer with all the suspension elements-wheel, tyre and wheel-road interface.
11 citations