Tuesday, April 12, 2011

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220VAC Motor Speed Controller Circuit With Triac

This 220VAC motor speed controller Circuit can handle brushed AC motors and other loads up to about 250W.It works the same was a dimmer circuit, cutting a portion of the AC waveform is seeking to effectively control the tension. Because of this feature will work cycle for a wide variety of loads including incandescent bulbs, heaters, brushed AC motors and transformers. The circuit attempts to maintain a constant engine speed regardless of load, it is also ideal for power tools. Note that the circuit can only control brushed AC motors. Inductive motors require a variable frequency control.
220VAC Motor Speed Controller Circuit  With Triac
  • TR1 must be chosen to match the requirements of the load. Most generic TRIACs with ratings to support your load will work fine in this circuit.
  • U1 must be chosen to match the ratings of TR1. Most generic DIAC based opto-isolators will work fine
  • T1 is any small transformer with a 1:10 turns ratio. The circuit is designed to run on 120V so a 120V to 12V transformer will work. Alternately, you can wind T1 on a transformer core using a primary of 25 turns, a secondary of 200 turns, and 26 gauge magnet wire.
  • R9 is used to adjust motor speed. R10 is a trim pot used to fine tune the governing action of the circuit. R8 fine tunes the feedback circuit to adjust for proper voltage at the gate of SCR1. It should be adjusted to just past the minimum point at which the circuit begins to operate.
  • R13 must be chosen to match the load. Generally, larger loads will require a smaller value.
List Component
R1      : 27K  1W Resistor 
R2 : 10K 1/4W Resistor
R3 : 100K 1/4W Resistor
R4 : 33K 1/4W Resistor
R5 : 2.2K 1/4W Resistor
R6 : 1K 1/4W Resistor
R7 : 60K 1/4W Resistor
R8 : 3K Trim Pot
R9 : 5K Taper Pot
R10 : 4.7K Trim Pot
R11 : 3.3K 1/4W Resistor
R12 : 100 Ohm 1/4W Resistor
R13 : 47 Ohm 1W Resistor (See Notes)
C1,C3 : 0.1uF Ceramic Capacitor
C2 : 100uF/50V
D1 : 6V Zener Diode
Q1 : 2N2222 
SCR1 : ECG5400
TR1 : TRIAC (See Notes)
U1 : DIAC Opto-Isolator (See Notes)
BR1,BR2 : 5A Bridge Rectifier
T1 : Transformer (See Notes)

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