The document describes an experiment using a MOSFET motor-speed control circuit. A full-wave bridge rectifier is used to convert 36V AC to pulsating DC, which is smoothed by capacitor C1. This DC voltage powers the motor. A separate 12V DC source powers the comparator. A zener diode and diode D1 protect against backlash current. Potentiometer VR1 is used to regulate the voltage to the comparator; turning it adjusts the MOSFET gate voltage and thereby controls motor speed.
The document describes an experiment using a MOSFET motor-speed control circuit. A full-wave bridge rectifier is used to convert 36V AC to pulsating DC, which is smoothed by capacitor C1. This DC voltage powers the motor. A separate 12V DC source powers the comparator. A zener diode and diode D1 protect against backlash current. Potentiometer VR1 is used to regulate the voltage to the comparator; turning it adjusts the MOSFET gate voltage and thereby controls motor speed.
The document describes an experiment using a MOSFET motor-speed control circuit. A full-wave bridge rectifier is used to convert 36V AC to pulsating DC, which is smoothed by capacitor C1. This DC voltage powers the motor. A separate 12V DC source powers the comparator. A zener diode and diode D1 protect against backlash current. Potentiometer VR1 is used to regulate the voltage to the comparator; turning it adjusts the MOSFET gate voltage and thereby controls motor speed.
The document describes an experiment using a MOSFET motor-speed control circuit. A full-wave bridge rectifier is used to convert 36V AC to pulsating DC, which is smoothed by capacitor C1. This DC voltage powers the motor. A separate 12V DC source powers the comparator. A zener diode and diode D1 protect against backlash current. Potentiometer VR1 is used to regulate the voltage to the comparator; turning it adjusts the MOSFET gate voltage and thereby controls motor speed.
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Experiment #12
MOSFET Speed Control
Description of Experimental Circuit
Fig. 26-12 MOSFET motor-speed control circuit
Conclusion :
We applied 36V AC source to full wave bridge rectifier and the output of bridge rectifier will be pulsating DC. Then C1 makes it DC voltage and it is connected with the motor. We applied separate DC source to comparator because we want to apply exactly 12V on comparator. Zener diode and D1 is placed to handle backlash current if the current flows in opposite direction then the zener diodes will block the current and there will no current in the whole except diodes. VR1 is placed to regulate the voltage in comparator, when VR1 is at left most position then there will be nothing on the output of comparator. When we start moving VR1 to the right side then voltage will appear at the output of commparator which leads to on the MOSFET and motor starts runnning.
