SWITCH CIRCUIT FOR POWER TOOL

PURPOSE:To increase a motor torque by detecting the increase of a motor load through a current value at the time of the low-speed rotation of a motor and by applying a feedback to the motor load. CONSTITUTION:Normally when a switch 15 is opened and a low-speed control circuit 13 is in an operating s...

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Bibliographische Detailangaben
Hauptverfasser:	YAMASHITA KIMITSUGU, HAMAZAKI SHINYA, NAGATA KUNIO
Format:	Patent
Sprache:	eng
Schlagworte:	CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	PURPOSE:To increase a motor torque by detecting the increase of a motor load through a current value at the time of the low-speed rotation of a motor and by applying a feedback to the motor load. CONSTITUTION:Normally when a switch 15 is opened and a low-speed control circuit 13 is in an operating state and a motor M is not loaded, a triangular- wave oscillator circuit 16 produces a triangular wave, which is set as a basis, to operate a switching circuit 17 to operate an output element 14 and to rotation-control the motor M. When a load is applied to the motor M and electric current is increased, the increased current is detected by a motor current sensing circuit 20 composed of a resistance 21 and an amplifier circuit 22 to send a signal to the triangular-wave oscillator circuit 16 to increase the load current of the motor.