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Electronics Schematics - M

Motor Control Circuits

12 Volt or 24 Volt DC Pulse Width Modulator: : This circuit can be used as a light dimmer or DC motor speed controller.

12 Volt Sump Pump Control:

220 Volt Motor Speed Control: can be used for controlling the RPM of a ball mill and star rolling machine motors, or electric drills

230 Volt AC Motor Controller: controls speed of230-Volt AC universal motor, in PDF format, text in Finnish

68HC11 Stepper Motor Control:

AC Motor Driver Features PC Programmability : 08/05/02 Electronic Design - Ideas for Design / A simple PC-programmable ac motor driver is easily implemented using one FIFO, simple logic, and power drivers. Figure 1 shows the basic block diagram of the circuit. It generates three sinusoidal voltage.

AC Motor Speed Controller:

AT89C2051 / 4051Stepper Motor Interface:

Boost Converter Controls 12 Volt Fan From 5 Volt Supply: 12/12/97 EDN-Design Ideas / Temperature-controlled PWM boost converter allows operation of a12V brushless dc fan from a5V supply

Circuit Controls Isolated 12 Volt Stepper Motor: 09/26/96 EDN-Design Ideas / Allows full direction and step control of a12V, four-phase stepper motor from a5V, TTL/CMOS-compatible logic controller

Circuit Controls Slew for Stepper Drive: 08/19/99 EDN-Design Ideas /  Slewing control for stepper motors that you use in sophisticated applications, such as monochromator movements in optical experiments

Circuit Forms DC Motor Switch With Brake: 01/10/02 EDN-Design Ideas / Controlling a small dc motor without speed control sounds like a trivial task; a switch or a relay should suffice. However, several problems accompany this approach.

Circuit Generates Analog Fan Speed Control: Maxim-IC Appnote #1125 /  This circuit delivers a continuous and linear fan-control voltage that is proportional to temperature.

Circuit generates fan speed control: 03/21/2002  EDN - Design Ideas / Fan noise is becoming a significant issue as electronic equipment increasingly enters the office and the home. Noise is proportional to fan speed, and the airflow hence, fan speed necessary for cooling is less at low ambient temperatures. Because ambient temperature is lower than the upper design point most of the time, a fan can run slower, making it easier on the ears.

Circuit protects system from overheating: 11/08/2001 EDN - Design Ideas / The two-chip circuit in Figure 1 provides fan control and over temperature warning and shutdown signals to protect systems from excessive heat. The circuit monitors the temperature of the pc board and the die temperature of a CPU, an FPGA, or another IC with an on-chip temperature-sensing transistor. .

Circuit provides bidirectional, variable speed motor control: 05/16/2002  EDN - Design Ideas / During the development of systems that include small motors, a simple, bidirectional motor controller with speed adjustment may be helpful. Figure 1 shows such a controller. The circuit uses everyday components whose tolerances and ratings are unimportant as long as they sustain the required voltage, current, and power..

Circuit provides Class D motor control: 05/01/03  EDN-Design Ideas / Class D audio amplifiers provide a dual benefit for battery-powered portable devices. They enhance battery life, and they produce much less power dissipation than do their linear cousins. Those features make Class D amplifiers ideal candidates for controlling speed and direction in small electric motors....

Computer Controller for DC Motors: This circuit is easy to build and use and it can control two DC motors of any current or voltage rating, depending on the rating of the relays. The circuit also provides two shaft encoders for positional feedback to the computer.

DC Motor Reversing Circuit:

DC Push Button Motor Control Circuit:

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

Dimmer/ Motor Speed Control:

DIY Wavemaker: controls two electric water pumps

Fan Controller Adapts to System Temperature: 09/25/97 EDN-Design Ideas /  The circuit adjusts a fans speed according to temperature.

H Bridge Direct Current Motor Control Circuits:

H Bridge Motor Control: general introduction to H bridges

H Bridge Switch for Small Motors: simple switch circuit for reversing and stopping a motor without any control of speed

increasing the High Speed Torque of BiPolar Stepper Motors: National Semiconductor Application Notes,05-Aug-1995

Inexpensive Logic Controls Stepper Motor: 03/26/98 EDN-Design Ideas

Infrared Toy Car Motor Controller:

Load Measurement On DC Motor Needs No Sensing Transformer : 04/15/02 Electronic Design - Ideas for Design / When absolute precision isn't an issue, engineers can select PWM control and back-EMF (BEMF) sensing for a dc motor's speed control. The motor must also be protected from overload. Typical solutions use a current-sensing transformer, or sensing...  

Low Voltage DC Motor Speed Controller:

Make a Simple Ramp Generator for Stepper Motors : 04/04/02 EDN-Design Ideas / Stepper motors are synchronous motors that step at the pulse rate of the driving signal. For the motor to move quickly, the stepping rate must be fast.

Make a simple ramp generator for stepper motors: 04/04/2002  EDN - Design Ideas / Stepper motors are synchronous motors that step at the pulse rate of the driving signal. For the motor to move quickly, the stepping rate must be fast. However, because of motor and load inertia, the motor often cannot go from 0 rpm to the desired number of revolutions per minute in one step. Therefore, most stepper motors receive their drive from a pulse chain that starts out slowly and ... .

Mini Drill Variable Power Supply:

MOSFET switch provides efficient AC / DC conversion: 02/17/00 EDN-Design Ideas

Motor control scheme yields four positions with two outputs: 02/07/2002  EDN - Design Ideas / Figure 1 showshow to position a mechanical device into four discrete positions but with only two free outputs and one free input from the control system. The position depends on a set of cams and four corresponding limit switches. The 24V-dc motor comes with a worm gear. Darlington transistors Q3 to Q6 and resistors R7 to R12 form an H-bridge that drives the dc motor, M.

Motor Controller operates Without Tachometer Feedback: 12/09/99 EDN-Design Ideas / PDF contains multiple circuits - scroll to find the one of interest / This circuit uses a back-EMF for motor speed controlling to make a voltage controlled motor speed controller

Motor controller uses fleapower : 09/25/03  EDN-Design Ideas / A simple, permanent-magnet dc motor is an essential element in a variety of products, such as toys, servo mechanisms, valve actuators, robots, and automotive electronics. In many of these applications, the motor must rotate in a given direction until the mechanism reaches the end of travel, at which point the motor must automatically stop...

MOTOR DIRECTION CONTROLLER: This circuit can control a small DC motor, like the one in a tape recorder.

Motor Speed Control: allows you to control the speed of an AC motor, for example an electric drill, designed for115-Volt AC

OptoCoupled Gate Detects Motor Operation: 02/02/98 EDN-Design Ideas

PCB Drill Controller: The speed controller in this article overcomes this problem by raising the voltage to the drill as the load is increased. The unit uses a basic Pulse Width Modulation (PWM) regulator to reduce the power dissipation.

Position Detectors Provide Motorcontrol Logic: 05/24/01 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit.

Power Line Appliance Controller:

Programmable Source Powers DC MicroMotors: 03/01/01 EDN-Design Ideas / PDF contains multiple circuits - scroll to find the one of interest / A simple, economic, compact, and tricky way of using the LM723 as a programmable voltage source to drive dc micromotors which can set the output to a value of200 mV to 6V

Pulse Width Modulation DC Motor Control: controls the motor speed by driving the motor with short pulses

PWM Controller: 555 Timer based PWM motor control project for electric fan or other DC motor

PWM DC Motor Speed Control:

PWM Motor / Light Controller Variations: diagrams are for12V operation and there are high side (common ground) and low side (common +12V) versions

PWM Speed Control: includes theory and some example circuits

Rotary Controller Positions Stepping Motor: 08/03/95 EDN-Design Ideas

Serial Servo Motor Controller:

Simple Emergency Sump Pump Control: Sump Pump Control for12V DC Bilge Pump

SIMPLE STEPPER MOTOR CONTROLLER: This circuit can be used to control a unipolar stepper motor, which has four coils

SN754410 Dual Motor Driver Board:

Speed Control Handles Isolated –48 Volt Fans : 08/05/02 Electronic Design - Ideas for Design / Chips are available to monitor and control ventilation fans. But less common are fan controllers for telecom applications. Such fans must operate in electrically isolated environments with a supply voltage in the 36- to 72-V range. For example, the...  

Stepper Motor Controller #1:

Stepper Motor Controller #2: Uses the CPLD and 8031 microcontroller on the XS95 Board to control the rotational speed and direction of a stepper motor. (This project is in Spanish.)

Stepper Motor Driver : 74194 Inexpensive stepper motor driver that could be used to power slow speed projects on the layout or other hobby applications

Stepper Motor Experiment:

Stepper Motor Positioner:

System monitors multiple temperatures, controls fan speed: 10/12/00 EDN-Design Ideas

Temperature Controlled NiCad Charger:

Temperature Regulator:

Thermo Cooling Fan: fan controller, which controls fan based on temperature

Three Phase Motor Driver Prevents Stalls: 01/05/95 EDN-Design Ideas

Two Components Drive Stepper Motor: 01/19/95 EDN-Design Ideas

Using a Light Dimmer IC for AC Motor Speed Control: This circuit example uses LS7231 Light Dimmer IC

Variations on the PWM DC Motor Speed Control:


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