EDDY CURRENT DYNAMOMETER SPEED CONTROL CIRCUIT AND METHOD

An eddy current dynamometer speed control circuit includes transistors connected in series with the motor field coil and the absorbing field coil to control the current in the coils in a continuously variable manner to effect changes between a braking mode and a motoring mode responsively to dynamom...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
1. Verfasser:	ANDERSON H,US
Format:	Patent
Sprache:	eng
Schlagworte:	CONVERSION OR DISTRIBUTION OF ELECTRIC POWER DYNAMO-ELECTRIC MACHINES ELECTRICITY GENERATION MEASURING MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER,MECHANICAL EFFICIENCY, OR FLUID PRESSURE PHYSICS TESTING
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	An eddy current dynamometer speed control circuit includes transistors connected in series with the motor field coil and the absorbing field coil to control the current in the coils in a continuously variable manner to effect changes between a braking mode and a motoring mode responsively to dynamometer speed changes. The speed control circuit utilizes a regulated voltage onto which is impressed a tachometer signal having an amplitude related to the speed of the dynamometer input/output shaft. Control voltages for the transistors are applied through Zener diodes each of which function as a threshold circuit to control the initial acceleration of the input/output shaft of the dynamometer and for causing a full motoring field to be applied responsively to abnormally large speed drops for quick recovery. A current sharing transistor circuit is also disclosed.