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Posted 20 hours ago

Motor Speed Controller, AC 220-240V Motor Speed Control Module Governor for Electromagnetic Asynchronous Motor(JD1A-40)

£9.9£99Clearance
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About this deal

Control induction motors* up to 1.5kW (2HP) to run machinery at different speeds or controlling a pool pump to save money. Also works with 3-phase motors. Full form kit includes case, double-sided silk-screened PCB, heatsink, cooling fan, hardware and electronics (including parts from revised article in August 2013). The speed may be varied using a front mounted rotary control knob, and the minimum speed can be adjusted by a side mounted adjustment trim pot.

Company policy is that we do not under any circumstances issue instructions to our couriers to leave deliveries unattended when no one is at the delivery location. Bought to replace the standard resistive foot pedal controller on a vintage domestic sewing machine. MUCH better slow speed control now, will stitch at a 'stitch by stitch' slow speed with much more torque. Built a custom 470ohm foot controller to go with it, motor stays cool, module stays cool, a perfect solution for the control of a small 50w AC motor, well worth going to the trouble to build it, well happy.Max. admissible current: 6A (constant duty: 3A), at 110V~ this corresponds to maximally 600 watt or constant duty 300 watt, respectively, or to maximally 1200 watt or constant duty 600 watt, respectively, at 230Vac Single phase motors with internal centrifugal starting switches can not be speedcontrolled electronically. Important Note: The module HAS to be mounted on a heat sink or cooling plate if the constant load exceeds 8 amps. Using an existing drill to wind on cat gut is clearly a good idea, however buying a drill to do the job is something else. Loads of applications! ...regulates incandescent lamps, heaters, hand drills, motors etc. via a potentiometer. Operating voltage: 110...240V~. Max. admissible current: 6 amperes (3A constant duty). At 230V~ this corresponds to 1200 / 600W and to 600 / 300W at 110V~.

Note: This project is designed for brush type motors and is not suitable for induction motors or shaded pole motors. May also be used for low voltage loads (from 24V). Supply and load circuit electrically isolated from one another. Several people have asked what component values would be required to operate on 110-120VAC, myself included! So, here is my version of this speed control for 110VAC operation. The component values that I figure need changing are those that determine the charge rate of the phase shift circuit feeding the Diac. Those would be the 3K3 resistor and the 500K pot. Both should be cut in half since only half the voltage is charging the phase shift circuit (15K and 2 x 100 nF). Given the Rs/Cs are filtering 110 vs. 220, I thought it might be a good idea to change Rs to 47 ohms and double the capacitance of Cs. Cf could also be doubled. When I bread-boarded this circuit, I noticed that the 250K pot (500K/2) was ineffective from 250K down to about 70K; measured at complete shut off, so I replaced the pot with a 100K linear pot. The circuit runs up to about 90% of full speed because the Triac doesn’t turn ON until the Diac conducts at around 30V; DB3 breakdown voltage. I used a Diac and a Triac different from the schematic, but locally available. Reference the 3rd schematic above: https://www.electroschematics.com/wp-content/uploads/2009/11/motor-speed-control.gif

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The controller canonly be used to control the speed of a 1ph, AC electric motor providing that the motor does NOT have an internal centrifugal switch. This Universal AC Motor Speed Controller SELF-ASSEMBLY electronic kit is designed to control AC motors (24-240Vac, 5A) with carbon brushes (drilling machine, vacuum cleaner, saw, ...). High torque, even at low r.p.m. I tried different bulb sizes until I found one which kept the iron hot, but not hot enough to burn the tip. Very simple and it worked, OK today we have thermostatic soldering irons so not required any more. However the same result could have been got using a lamp dimmer, but why, better to keep it simple.

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