METHOD FOR CONTROLLING ROTATIONAL SPEED OF ELECTRIC MOTOR

PROBLEM TO BE SOLVED: To provide a method for controlling the rotational speed of an electric motor which keeps the rotational speed low, until its torque reaches a limit. SOLUTION: A circuit (2) for controlling the rotational speed is connected to a power source, and controls the rotational speed o...

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Bibliographische Detailangaben
Hauptverfasser:	PETER HELLMANN, OSSELMANN CLAUS, TROEDER LUTZ
Format:	Patent
Sprache:	eng
Schlagworte:	COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDEDFOR CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS CONVERSION OR DISTRIBUTION OF ELECTRIC POWER DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOTPARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOTOTHERWISE PROVIDED FOR ELECTRICITY GENERATION HAND TOOLS MANIPULATORS PERFORMING OPERATIONS PORTABLE POWER-DRIVEN TOOLS TRANSPORTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for controlling the rotational speed of an electric motor which keeps the rotational speed low, until its torque reaches a limit. SOLUTION: A circuit (2) for controlling the rotational speed is connected to a power source, and controls the rotational speed of the electric motor (1) from a high rotational speed (N1) to a comparatively lower rotational speed (N2, N3 and N4). In a first step, depending on a preselected rotational speed (N1, N2), the rotational speed control is limited to a lower effective motor voltage (Ueff) by the circuit (2). In a second step, depending on the torque (M) needed for the control to the preselected speed (N1, N2), the motor voltage (Ueff) is controlled within the limited range.