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How to Build a High Torque DC Motor Speed Controller Circuit
PULSE WIDTH MODULATION DRIVER FOR MOTOR SPEED CONTROLCIRCUIT DESCRIPTIONPARTS LISTBACK EMF LOOPED, AC MOTOR SPEED CONTROLLER CIRCUITBuilding an electronic circuit for achieving DC motor speed control may seem quite simple, and you should be able to find many such ordinary circuits dealing with speed regulation. However, practically you will find that simpler circuits have one serious drawback – they are not able to control the motor speed smoothly at lower levels, and as the desired speed is decreased, the torque of the motor also decreases proportionately. Due to this, at any unpredictable point the motor may just halt v..See more on brighthubengineeringAuthor: Swagatam
DC Motor Control Circuits | DC Electric Circuits Worksheets
wwwboutcircuits›Worksheets›DC Electric CircuitsDC Motor Control Circuits; Worksheet Topics . DC Motor Control Circuits DC Electric Circuits. Question 1. How is it possible to electrically measure the torque output by a permanent-magnet DC motor? Hint: it is very simple, and for large electric motors it involves the use of a shunt resistor. Modify this circuit diagram to include a meter thatThe motor’s stall torque will increase.The counter-EMF will increase, and the motor will slow down.As a series-wound motor is slowed down by a mechanical load, its field strength increases, causing the torque to increase dramatically.“Compound” electric motors have both a series and a shunt field winding, giving it a hybrid operating characteristic.The potentiometer could be adjusted to provide less resistance, in order to hasten the switch to “full-speed” mode after startup. Challenge question: what else could be changed in this circuit to provide a shorter “reduced speed” time period?Dynamic braking is re-connecting the motor as a generator, and dissipating the generated power into a resistive load. Regenerative braking is an extension of dynamic braking, using the generated power to do something useful. Plugging is the temporary application of reverse polarity to the motor to forcefully stop it.This circuit provides dynamic braking.This switching circuit will not reverse the motor, because it reverses polarity on both the armature and the field. Follow-up question: what does this fact tell us about the motor’s ability to operate on alternating current (AC)?

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