FeedbackPWMSpeedControl032706-2

FeedbackPWMSpeedControl032706-2 - Feedback Control of DC...

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Feedback Control of DC Motor Speed M. D. Fox 10 ê 28 ê 05, Update 11 ê 08 ê 05; 3 ê 28 ê 06 Introduction This notebook describes the use of the rotary pulse generator [RPG] on the motor to stabilize the motor speed. The RPG is fed to a voltage to frequency converter, which transforms the output to a voltage level proportional to the motor speed. This signal in turn is used to drive a power field effect transistor to stabilize motor speed against changes in load. The particular approach used allows the speed control to be implemented by a single, TL082 chip which contains two FET input Op Amps. A potentiometer is generates a reference voltage which sets the motor speed.
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Figure 1 Setup for speed control, maximum load conditions. Left multimeter shows voltage applied to motor in Volt, right multimeter current in load machine in Ampere. Resistance box controls load. 2 FeedbackPWMSpeedControl032706-1.nb
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VFC based speed controller à General In Fig. 2 below, we show either of the RPG outputs being sent to a differentiator and then a rectifier. This generates a series of pulses at the frequency of the RPG. This pulse sequence is then fed to the leaky integrator in the first stage of the TL082, resulting in a voltage designated V i that is proportional to the speed of the motor . V i is then fed into the second Op Amp in the TL082 to buffer and invert the VFC output. A reference voltage is fed into the noninverting input of the second TL082 stage to
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This note was uploaded on 11/18/2010 for the course ECE 3211 taught by Professor Marks during the Spring '08 term at UConn.

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FeedbackPWMSpeedControl032706-2 - Feedback Control of DC...

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