Method and apparatus for electrical dynamic braking
US5361022A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 23, 1993 |
| Grant date | Nov 1, 1994 |
| Priority date | — |
| Expiry date | Mar 23, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P3/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A dynamic braking circuit for use with bi-directional conveyor systems and other equipment having a soft start/hard stop capability in both directions of movement. The circuit electrically brakes the rotation of a DC motor by short-circuiting the armature of the motor, thereby creating a reverse current and reverse magnetic field to oppose the motor's rotation. The circuit uses high-voltage, high-current SCR's to switch the motor running current (in both directions) and to brake the motor as quickly as is possible for a braking circuit that uses such reverse current. The circuit thereby operates without the use of any in-series braking resistors or "smoothing" inductors which lower the magnitude of the reverse current. The SCR's are gated "on" in pairs per each half-cycle of the AC power supply, which enhances noise immunity of the overall SCR control circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.