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Last Updated
03/31/2019
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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION. |
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ELECTRIC MOTOR CONTROL & WIRING x SPEED CONTROL (ELECTRIC MOTOR) xx ELECTRIC MOTOR xx ELECTRIC POWER CONTROLLER Low cost circuit provides variable speed operation for audio tape decks having AC induction motors. An electronic speed control for belt-driven turntables employing a synchronous motor. Stabilizing AC motors for better sound. Build a crystal referenced variable frequency power supply to precisely control the speed of a turntable, tape recorder, or some other device equipped with a synchronous motor. Controlling small DC motors with analog signals. Use to make a computer-controlled lunar lander simulation model. DC motor controls. Precisely control permanent magnet DC motors with the circuits described here. Build a motorized platform. AC motor control. Simple algorithms and hardware. Two experiments illustrate how to connect a microcomputer to an external device. Advice on how to wire a split-phase induction motor used to power shop tools. Motion-control basics. Types of motors, stepping-motor basics, drive circuits and programming for SBCs (single-board computers) and microcontrollers. A DC motor speed controller uses a pulse-width modulated amplifier to maintain constant motor speed for robot motive power and other applications that require high efficiency. Speed or power control circuit for DC loads. Low-voltage power controller (3- to 12-volts). Use it as a dimmer for low-power lamps or as a speed control for small DC motors. Est. cost: $35. Semi-conductor speed control for universal motors. Full range speed control for universal motors. Simple light dimmer and motor speed control using a silicon-controlled rectifier (SCR). The theory of the SCR is also explained. Motor speed controller circuit varies the duty cycle rather than the voltage. Circuit to run an AC motor for 10 seconds every hour. The motor rotation is reversed each time the moter is activated. Power semiconductors. Part 2. Power control circuits. Learn to apply power semiconductors in practical power control circuits. Use them to control appliances, motors, and relays. Power semiconductors. Part 3. Synchronous power control. Learn about zero-voltage or synchronous AC-line power switching and control. AC and DC control circuits. Circuits based on the triac or silicone controlled rectifier as the power switching device. (1) AC light-dimming circuits. (2) Universal motor control. (3) DC power control. (4) DC power switching. Constant-speed sewing-machine motor controller circuit uses feedback. Works only with universal motors (not AC induction motors). Pulse-width modulator circuit acts as a motor-speed control. An AC proportional voltage controller for your PC. Use it to control the voltage level of an appliance that uses 110-volt AC service. Connects to the parallel port of a PC. Applications can include light dimming, motor-speed control, heater control, etc. SCR controls for small series and shunt-type universal motors. Circuit to stop, reverse and accurately control speed of any 1/3 hp (or less) DC shunt motor. Diagram of universal motor speed control (half-wave) using a silicon-controlled rectifier. Soldering iron heat control can also serve as a motor speed control, lamp dimmer, etc., up to 8 amperes. Est. cost: $10. Build a select-a-speed motor control. Two versions shown. (1) Continuously varies the rpm of portable 1/4" electric drill motors. (2) Larger unit that has four speeds, selected by a switch. Both units use a silicon controlled rectifier. Electronic speed controller and pulser for use with kitchen mixers, blenders, and food processors. Est. cost: $10. Tip: How to install an inexpensive reversing switch on electric motors used on tools. Est. cost: $2. Tips on convertability of 60-cycle tools for operation on European 50-cycle current. Use of a variable-speed control unit on universal electric motors is explained. How to install a DPDT (double-pole, double-throw) switch to reverse the rotation of an electric motor. Circuit to control the speed of a small motor. Electronic speed control circuit uses the "hit-n-miss" theory by turning the motor on-and-off continuously in order to control the speed. Temperature-controlled soldering station. Variable controller delivers from 5- to 95-volts to a soldering iron, AC tool, etc. Motor speed and direction control circuits. (1) AC and DC circuits to control the speed and direction of rotation of a permanent-magnet, brush-type DC motor. (2) Modification of circuit which incorporates a feedback feature that allows the motor to move an object to an exact position and stop automatically. E-Z math (for electronics). Understanding pulse signals for logical operations, motor control, communications, etc. Speedi-watt power controller can be used as an electronic speed control for electric drills or fans, as a power controller for electric blankets or soldering, as a lamp dimmer, etc. Suitable for loads up to 500 watts. Includes components for RFI suppression. Tip: How to tell the direction of rotation of a motor stator before the motor is assembled. Easy-to-build computer-controlled triac dimmer. Handles up to 200 watts. Use to control incandescent lights or motors. Circuit for an electronic speed control for small, low-voltage dc motors (3 to 6-volts) which normally revolve at high rpm, in the neighborhood of 10,000 rpm. Est. cost: under $11. Circuit to turn a small motor on for 10 seconds and off for 20-30 seconds. Motor has a resistance of 3 to 6 ohms and runs on three volts. Circuit built around a 555 IC will turn on a 12-volt motor for 4 minutes then turn it off for 4 minutes. Circuit to operate a 100-150 ma motor in either a forward or reverse mode using standard five-volt TTL outputs. Circuit to turn small motors on and off in response to a light beam. Use to control model trains or toys. Est. cost: under $9. Experimenting with small dc motors. Circuits included for motor-reverser and speed control. A solid-state light dissolver. Controller smoothly dims or brightens lights automatically with the flip of a switch. Handles up to 300 watts. May also serve as motor speed control. How phase control works. Description of a full-wave phase-control circuit typically used in light dimmers and motor speed controllers. AC motor speed controller uses optical couplers and a binary counter. Three-phase motor protector. Low-power semiconductor devices inexpensively prevent failure of multiple-horsepower AC motors. Low-cost SCR motor speed control. Variable speed control has 600-watt rating. The Dymwatt, a full-wave motor speed control and light dimmer. Circuit for full-wave control to vary speed of small motors and dim incandescent and fluorecent lamps. Audio-modulation of 500 watts of light, or a general-purpose motor speed control. Est. cost: $10. Speed control, reversing and dynamic braking for DC shunt motors. AC power control circuit can handle 50 to 100 watts and serve as light dimmer or speed control. Uses two medium power transistors. Compressor guard device. Protect air conditioner, refrigerator and freezer motors from damage during power blackouts or brownouts. This timing device will not allow the electric motors in compressors to restart until 4.5 minutes have elapsed. This gives the system pressures time to equalize. Circuits for two basic motor speed control circuits, a triac motor control circuit and a starting circuit for medium and high-power ac motors. Electronic dc motor control circuit with accelerator and braking action for use in controlling miniature electric racing cars. Control the speed of small dc motors, the brightness of a lamp, or otherwise drop a dc voltage by using pulse-width modulation. NASA solid-state motor-control circuit cuts electric cost by reducing inefficiencies in AC induction motors such as those used in refrigerators and dishwashers. Est. cost: $30. Circuit for an external speed control for a drill motor or other electrical device drawing up to 10 amperes. Vary the speed of synchronous motors with this programmable control. DC-to-AC inverter can be used to control motors in tape drives, turntables, telescopes, electrical timepieces, etc. Circuit for a solid-state speed control suitable for use with an electric drill. Controller circuits for small DC motors control speed and direction of rotation. Variable 10-amp unregulated AC/DC power supply also serves as a "universal" 1.5 hp AC or DC motor-speed controller. Motor-controller circuit combines a relaxation oscillator and an optocoupler-controlled Triac. Pulse-width modulation circuit for a DC motor or heater uses an op-amp to lessen the amount of power dissipated by the FET transistor. Circuit for controlling the speed of a 5-volt to 12-volt DC motor. Includes a modification for motors requiring up to 20 amps. Voltage regulator applications. (1) In-rush current limiter circuit keeps current at the rated operating level of the device to be protected. (2) Visible-light transmitter circuit. (3) Visible-light receiver circuit. (4) Using two common voltage regulators to vary both voltage and current. (5) Circuit to control a small DC motor or small lamp. DC-motor speed-control circuit. Build a low-voltage (12-volt) power controller. Use it as a dimmer control for low-power lamps or as a speed control for small DC motors. Handles up to 16 amps. Est cost: $35. Speed control circuit for fans and other AC motors that have less than 1/4 horsepower and lack a centrifugal starting switch. Solid-state speed control circuit for an electric drill. Build a speed controller circuit for small DC motors which gives you a 5% to 98% control range. Est. cost: $16 (kit). Simple op-amp application circuits. (1) Fixed voltage reference. (2) Light-operated sensor. (3) Alarm sensor. (4) Voltage-level sensor. (5) Peak-voltage detector and hold. (6) DC motor driver and reverser. (7) Simple timer circuit to delay relay operation for up to 30 seconds. Unusual motor-controller circuit is able to drive a small DC motor clockwise or counter-clockwise through a unique use of photoresistive components. DC-motor voltage-reversal control circuits. Part 1. (1) Manually operated. (2) Grounded input. (3) Positive input. (4) NPN circuit. (5) PNP circuit. (6) High power. (7) SCR augmented. DC-motor voltage-reversal control circuits. Part 2. (1) Variable-output add-ons. (2) AC driver. (3) HexFET circuit. (4) Latching HexFET circuit. (5) All HexFET circuit. Build the three-phaser. Device lets you connect three-phase motors to single-phase power lines. Est. cost: $20. A 600-watt motor speed control with a built-in 60-second timer. Motor-reversing switch you can build which will operate most single-phase reversible motors up to 1 hp. Checking and repairing electrical contacts on home appliances and motors. Uses for electronic speed controls. Power-tool speed control will control two tools at once. Est. cost: $25. Pedal-operated speed control for power tools. A silicon-rectifier speed control for use with any series-wound AC-DC universal motor rated up to 3 amperes current drain. Uses sewing machine pedal for control. Solid-state device quickly and easily eliminates burned-out starting relay on most split-phase motors. Diagram shows how to wire in this commercially available device. Est. cost: $5. Circuit for controlling the speed of small dc motors. All about transistor switches. How to control motors, relays and light bulbs with digital IC's. How to reverse the rotation on various styles of electric motors. Some tips. Ten-level dimmer switch or electric motor speed controller circuit uses a single IC chip, a triac and a few other ordinary components. Electronic speed controls for universal and induction motors are compared and contrasted. Controlling an inductor (such as a relay or motor coil) using a solid-state device requires special protection techniques. Three transient (spike) suppressor circuits shown. Circuit will drive a small DC motor over a wide range of speeds without stalling (by controlling the duty cycle of the motor rather than the supply voltage). SCR range expander. Double the control range of an SCR motor speed control (up to 100 volts and 150 watts) with this attachment. Est. cost: $6. How to regulate the voltage delivered to a 3-volt DC motor (and thus the speed of the motor) to make it suitable for use on a Poncet-style telescope mounting. Tip: Use liquid-tight strain relief connectors to keep sawdust from invading totally enclosed motors and capacitor boxes. Advice on using speed controllers on routers. Circuit for a motor speed control is made from a ordinary lamp dimmer. Reversing electric motors. How to rewire and/or install a switch to reverse the rotation of an induction motor. A simple way to change the direction of a reversible electric motor. Involves wiring a small outlet fixture into the reversing circuit so that the motor can simply be plugged to reverse polarity. | |||||||||
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