Showing posts with label Motor Controller. Show all posts
Showing posts with label Motor Controller. Show all posts
Tuesday, April 12, 2011
220VAC Phase Controller Circuit Using U208B
This phase control circuit can be used for controlling the power supplied to an AC load. AC waveform is controlled by the phase control circuit, cutting cycle to provide full cycle, half cycle, the cycle to zero, or somewhere in between. Maybe you can tell which is very similar to an dimmer circuit, but switching and zero crossing of the waveform is synchronized.
Triacs not to suffer power losses, thus increasing overall efficiency, there is the advantage of the power of the method of zero crossing. This control circuit is adapted phase for heating the filaments, brushed AC motor, or incandescent lamps. U208B acts as a phase control circuit in bipolar technology with monitoring of the power supply internally. Uncontrolled output pulses avoided by internal controls, tension builds. Further more, it has the sync voltage and internal power. It is strongly recommended as an inexpensive control in open loop.
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.
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| 220VAC Motor Speed Controller Circuit With Triac |
Note:
List Component- 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.
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)
Thursday, February 17, 2011
DC Motor Speed Controller Using NE555 PWM Switching
The following project is a PWM fan control, It is very easy to be built and it can efficiently control all DC fans to rpm as low as 450 rpm (the lowest limit has to do with the fan type and manufacturer). It uses ONLY one 555 timer and a few other components, and it can be powered also directly from the PC power supply, from the 12 Volts line.
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| DC Motor Speed Controller Circuit Using NE555 PWM Switching |
The 555 will create a series of PWM pulses and will be driven directly to the gate of the MOSFET. The MOSFET is chosen to be big enough to carry enough loads, up to 9.2 amperes. You can choose a MOSFET according to your needs.
The MOSFET will generate enough power so that the motor will start revolving. The capacitor across the MOSFET is the solution to the'kicking sound'. The MOSFET will send to the motor pulses according to the pulses generated from the 555. If you remove the capacitor, you will definitely hear this annoying sound. The capacitor will smooth the voltage across the motor and therefore the power driven to it will be smooth, avoiding the torque kick
STK672-110 Full|Half Stepper Motor Controller
The STK672-110 chip has no microstepping mode and also has some less capabilities than the 080, yet it is very flexible and compact for full and half wave stepper motor applications.
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| STK672-110 Full|Half Stepper Motor Controller Circuit |
S1 controls the rotation direction of the motor. The reset circuit (R1-D1-C3) is as described by the manufacturer of the chip. You can use this input (Pin 6) for making resets other ways, like for example if you plan to control the chip with a microcontroller. In this case, you need to know that you must make a 10msec reset, every time that the chip is powered for the first time.
From the "MODE" input you control the type of stepper control. In this circuit, the chip connected for half-step. If you change the MODE input from +5 to GND, the circuit will work as a full step motor controller.
As for the coils of the motor, you need to connect the common wires of the coils (can be 1 or 2 on a unipolar motor) to the "C" connector, and the other 4 wires to the connectors "1" through "4". Usually, unipolar motors with 5 wires have the outputs in "1-2-C-3-4" row, and with 6 wires goes like "1-2-C-3-4-C" or "C-1-2-C-3-4" but this is can change! This is NOT always the same. You can go with trial and error or by measuring the coils of the motor to find the correct order. Do not forget the C4 capacitor!
About C4: In the Bill Of Materials underneath, this capacitor as 220uF 100V... Just playing safe. The chip can handle up to 50V, but this does not mean that cannot handle less. So, if your motor is like 3.3 volts or 5 volts, then a 100V capacitor is just too much. Get a 220uF 16V instead. Just do not be too close, for example, if your motor is powered with 12 Volts, go to 220uF 25 volts better. Electrolytic capacitors make a rather unpleasant noise when they explode.
For more details about STK672-110 stepper motor controller circuit please visit pcbheaven.com
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