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Motor Control Circuits   Page 3
Motor Controls:  #-B     C     D-G      H-L        M-O      P-R       S      T-Z

Last Updated on: Thursday, October 30, 2014 09:22 AM


Circuits Designed by Dave Johnson, P.E. :
  • DC Motor Brake
    When the power switch is closed, the gate voltage of Q1 turns Q1 on.  The drain of Q1 swings low, turning off Q2. Current flows freely into the DC motor with only one diode drop from D2.  When the power switch is open.  The gate voltage of Q1 swings low, causing the drain of Q1 to swing high. This turns on the transistor Q2.  With Q2 on, the resistor R3 is switched in parallel with the motor, producing a braking action.  The value of R3 can be selected for the desired braking action.  A zero ohm resistance will produce the fastest slow down of the motor.  The circuit below is good for about 500ma of motor current.  A Q2 transistor with a lower on resistance would be needed for bigger motors.  Also, D2 would need to increase in size

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
Dark Activated Switch (Andy Collinson) - This circuit will activate a relay when light falls to a preset level. Light level can be adjusted with VR1 and the relay contacts may be used to operate an external light or buzzer.
….(schematic added 03/04/05)
DC Motor Brake - When the power switch is closed, the gate voltage of Q1 turns Q1 on.  The drain of Q1 swings low, turning off Q2. Current flows freely into the DC motor with only one diode drop from D2.  When the power switch is open.  The gate voltage of Q1 swings low, causing the drain of Q1 to swing high. This turns on the transistor Q2.  With Q2 on, the resistor R3 is switched in parallel with the motor, producing a braking action.  The value of R3 can be selected for the desired braking action.  A zero ohm resistance will produce the fastest slow down of the motor.  The circuit below is good for about 500ma of motor current.  A Q2 transistor with a lower on resistance would be needed for bigger motors.  Also, D2 would need to increase in size ….(designed by David A. Johnson)
DC Motor Control Circuit - Here, S1 and S2 are normally open , push to close, press button switches.  The diodes can be  red or green and are there only to indicate direction. You may need to alter the TIP31 transistors  depending on the motor being used. Remember, running under load draws more current.  This  circuit was built to operate a small motor used for opening and closing a pair of curtains... (added 2/06)

 
DC Motor Control using a Single Switch - (electronic Circuit / Schematic added 10/04)
DC Motor Controller (jcmiras.net) - This DC Motor Controller circuit will control a 12V dc motor. The system will have three pushbuttons: a START button, a REVERSE button and a STOP button. Initially, the motor must not be running. When the START button is pressed, the motor will run in one direction. (added (07/05)
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DC Motor Driver with L6203 - The L6203 is a DMOS full bridge driver, which can handle the high peak current up to 5A and supply voltage up to 48V with RDS (ON) of just 0.3 ohm. The chip can run the motor at 4A continuous with proper heat sinking…..(electronic schematic added 11/06)
DC Motor Model - Although SPICE does not provide explicit models for electro-mechanical devices, like a DC motor, creating one is fairly straightforward. You just need to remember that most physical behaviors, whether mechanical or electrical, can be described by a set of equations. So for a desired ...(spice design added 02/09)
DC Motor Pulse Width Modulation Speed Control - This is a circuit for controlling the speed of small DC motors, it works nicely as a speed controller for an HO or N gauge model railroad. (electronic diagram added 11/06)
DC Motor Reversing Circuit (Andy Collinson) - A DC motor reversing circuit using non latching push button switches. Relays control forward, stop and reverse action, and the motor cannot be switched from forward to reverse unless the stop switch is pressed first. (added 4/02)
DC Motor speed Controller - Scroll down to find link to circuit drawing and circuit explanation….(electronic schematic added 09/06)
DC Motor-Driver H-Bridge Circuit - Physical motion of some form helps differentiate a robot from a computer. It would be nice if a motor could be attached directly to a chip that controlled the movement. But, most chips can't pass enough current or voltage to spin a motor. Also, motors tend to be electrically noisy (spikes) and can slam power back....(schematic added 03/04/05)
DC Motor-Driver H-Bridge Circuit circuitdb - Physical motion of some form helps differentiate a .... (added 2/07)t from a computer. It would be nice if a motor could be attached directly to a chip that controlled the movement. But, most chips can't pass...
DC Push Button Motor Control (Andy Collinson) - This circuit uses solid state switching (transistors) to control direction of a DC motor. You have precise control of the movement of the motor, and an indication of direction provided by LED's…..(schematic / circuit added 2/07)
DC servo Motor driver - ….(circuit design added 08/08)
DC Servomotor Controller - An experiment on the DC servomotor control system. It is controlled with only an AVR.  (added 10/05)
Delayed shutter control for Kodak DC-20 - (circuit added 1/07)
Desktop Power Supply - (application / block diagram added 6/07)
Desktop Power Supply Clone Market - (application / block diagram added 6/07)
Digital Speed Control - Digital Speed Control with aSwitching rate of 15KHz (circuit added 11/06)
Digital Speed Control for RC Car - DC motor PWM controller that takes the1ms to2ms pulse from the RC receiver and converts it into a PWM train at1Khz (added 5/02)
Digital Speed Control with Reverse - (Schematic added 11/06)
Dimmer/Motor Speed Control - Lamp dimmers using traics can be quite simple,  nothing more than a potentiometer, resistor, capacitor and triac with a built-in diac. (See Teccor's application note for examples and other technical data.) The circuit below is similar....(electronic circuit added 7/03)
DMOS 3A, 55V, H-Bridge - National Semiconductor Application Note  (app note added 6/06)
Dremel Speed - The circuit at right uses a logi-level N-channel FET driven directly by the PIC.  The PIC creates a variable PWM signal to power the  motor.  Motor current is sensed using a combined 0.5 ohm resitance to ground.  Since this ….(circuit design added 08/08)
Driving a relay with a CPU - ASCII format (circuit added 2/07)
Driving Bipolar Stepper Motors  - The permanent magnet rotor has the same number of pole pairs as the stator coil section. Interaction between the rotor and stator (opposite poles attracting and like poles repelling) causes the rotor to move ¼ of a pole pitch per winding polarity change. Motors are available in either 2 coil (bipolar) or 4 coil (unipolar) windings. In the unipolar  ….(design added 11/08)
DS1821 programmable thermostat - (diagram added 2/07)
DSSSE: Dual Slope-Sampling Solar Engine - Voltage-Controlled Solar Engine: The dual slope sensing SE is another Wilf Rigter design; this SE is optimized for 'bots with a low-power standby mode.  (added 11/05)
Dual Channel Servo Pulse to H-Bridge Interface - (circuit / schematic design added 7/06)
Dual Channel Servo Pulse to H-Bridge Interface ~mixos - (electronic circuit added 2/07)
Dual DC Motor Speed Controllers Navigate Robots - 03/29/01 EDN-Design Ideas: / Mobile robots need simple and lightweight dc-motor-speed-control hardware that can work with low-power batteries. Flip-flop type navigation systems allow only one motor to operate at a time while the other motor remains off. Navigation direction changes alternatively even when the robot has to navigate through a straight path. Line-tracker robots are of this type. (added 6/06)
Dual Fan Controller - Each fan turns off when the temperature drops 5 degrees below its turn-on temperature. For example, if the dial is set to 80 degrees, the fan turns on at 80 degrees and turns off at 75 degrees. This prevents the fan from cycling on and off rapidly, which would occur if the fan turned on at 80, started to cool the cabinet, and then immediately turned off at 79. ….(design added 11/08)
Dual Fan Controller (David Cook) - A birthday present gone too far. An overengineered temperature-based automatic twin fan controller with brass face to keep a kitchen PC cool.  (project added 11/06)
Dual Slope-Sampling Solar Engine - Voltage-Controlled Solar Engine: The dual slope sensing SE is another Wilf Rigter design; this SE is optimized for 'bots with a low-power standby mode.  (added 11/05)
Dual Stepping Motor Drivers using UDN2540 - In this design we use two UDN2540B to drive two stepping motors at the same speed. Each motor can be independently controlled. The S1, S2 switches control the ON/OFF and the moving direction of Motor1. The S3, S4 control the Motor2, respectively....(electronic circuit added 4/05)
Eight Way Switcher - (Schematic / Circuit added 11/06)
Electronic Motor Starter - (electronic Circuit / Schematic added 10/04)
Encoder & PC Make Complete Motor Control System - 12/12/02 EDN-Design Ideas: This Design Idea combines a simple ISA-bus-resident interface circuit; a garden-variety PC; a high-resolution optical shaft encoder; and a PWM-controlled, 0.05-hp, brushed, permanent-magnet dc motor to make a high-precision and high-power motion-control system. The system sequences the precise rotation of an evacuated steel bell jar.....(design idea added 1/05)
Engine Control Unit Schematics - (circuit / schematic design added 6/06)
Fan control - As we begin to enjoy those lazy hazy days of summer, the most important thing on most of our minds is how to keep cool during those hot days. For some of us that means turning up the old air conditioner and sipping on a nice cold glass of our favorite soft drink. However, we often forget about an equally important.... (electronic design added 6/07)
Fan Controller Adapts to System Temperature - 09/25/97 EDN-Design Ideas: Any piece of electronic equipment--whether it be a lab instrument, an audio amplifier, or a PC--that relies on a cooling fan to control internal temperature is a potential source of noise pollution or even hearing damage. Most of the time, the fan's noise level is probably much higher than necessary, because it has enough capacity to move.....(design idea added 2/03)
Fan timer based on Motorola 68HC908QT2 - (electronic circuit added 4/05)
Flashing LED-based Solar Engine - Voltage-Controlled Solar Engine: This design uses a flashing LED to determine the solar engine's voltage trip level.  (added 11/05)
Fly-back Converter - (application / block diagram added 6/07)
Four Way Switcher - (Schematic added 11/06)
Four Way Switcher #2 - (Electronic Schematic added 11/06)
Four-Speed Fan Control using Simple Remote Diode Temperature Sensor - National Semiconductor Application Note  (app note added 2/06)
Four-transistor H-bridge - an interesting 4-transistor H-bridge variant; this is cheap and easy to build, and best of all is "smokeless" (i.e., no combination of inputs can cause the bridge to self-destruct).  (added 11/05)
Frequency switch - (diagram added 2/07)
Fridge Saver - This circuit waits 5 minutes before re-applying the power to a refrigerator to prevent it from having to start up under pressure after a brief power outage. This is highly stressful for the compressor and the thermal cut-out switch built into the compressor. This device prevents frequent brief power interruptions....[Designed by Andrew R. Morris  (added 10/06)]
Frost Alarm (Andy Collinson) - The thermistor used has a resistance of 15k at 25 degrees and 45k at 0 degrees celsius. A suitable bead type thermistor is found in the Maplin catalogue. The 100k pot allows this circuit to trigger over a wide range of temperatures. A slight amount of hysteresis is provided by inclusion of the 270k resistor. This prevents relay chatter when temperature is near the switching threshold of this circuit. (added 2/06)
Full Bridge Converter - (application / block diagram added 6/07)
Full-featured Dual H-bridge - I had always assumed that dynamic braking would be most effective at higher speeds. However, actual tests using a Faulhaber (micro mo) gearmotor showed that the brake would hold a motor almost stationary. These gearmotors are so well made that I can turn the 4 mm diameter shaft with light finger pressure. For the tests I had mounted a 90 mm diameter wheel, which gave me tremendous mechanical advantage. I found with the wheel mounted that I could barely turn the motor against the brake.   (added 11/05)
Gate Boost Solar Engine - Voltage-Controlled Solar Engine: The "Gate Boost Solar Engine" is a new (6/2002) Wilf Rigter 1381-based design. This uses an internal voltage doubler to turn on a FET more efficiently.  (added 11/05)

 
Motor Controls:  #-B     C     D-G      H-L        M-O      P-R       S      T-Z


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