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Motor Control
Circuits Page 3 Motor Controls: #-BCD-GH-LM-O
P-RST-Z Last Updated on:
Monday, October 03, 2011 06:07 PM
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 - 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.… [Andy
Collison]
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. ….
[Designed by David A. Johnson]
DC Motor Control Circuit - 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 Motor Controller (jcmiras.net) - This DC Motor Controller
circuit will control a 12V dc motor. The system will have three
pushbuttons...
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 (Christian Sanchez) - 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....[David Cook]
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 - 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…. [Andy
Collison]
DC servo Motor driver - site is currently under construction [Site is under
construction right now]
DC Servomotor Controller - An experiment on the DC servomotor control
system. It is controlled with only an AVR. (added 10/05)
