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DC_MOTOR_DRIVE_WITH_FIXED_SPEED_CONTROL

2016-09-01 03:40  
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DC_MOTOR_DRIVE_WITH_FIXED_SPEED_CONTROL
The NE5561 provides pulse-proportional drive and speed control based on dc tachometer feedback. This simple switching circuit consists of transistor 2N4920 pnp with a commutation diode used to deliver programmed pulse energy to the motor. A frequency of approximately 20 kHz is used to eliminate audio noise. The dc tach delivers 2.7V/1000 RPM. Negative feedback occurs when this voltage is applied to the error amplifier of the NE5561. The duty cycle varies directly with load torque demand. The no-load current is≈ 0.3 A and full load is 0.6 A.