Download Mixer or Sewing Machine Motor Speed Control

SCR UYGULAMA ORNEKLERİ
Dimer devreleri
Motor electronic governor controller 5
The circuit work theory This motor electronic governor controller circuit is composed of SCR VT, diode VD1, VD2,
bidirectional trigger diode VD, LED VL1, VL2, capacitors C1, C2, resistors R1-R8, speed regulation switch S and
motor M, the circuit is shown in the figure 8-62. When the speed regulation switch S gear is changed, the chargedischange rate of capacitor C is changed, then the SCR VT conduction angle is changed too. The voltage on both
sides of C1 will trigger and turn on VT by VD, the AC voltage on both sides of motor M can be changed by changing
the conduction angle of VT, then M's running speed is changed too.
Permanent Magnet Motor Control with SCR
This is a schematic diagram of Permanent Magnet Motor Control circuit. This circuit is used to control the permanent
magnet control. This circuit uses alternistor triac to enhance commutation characteristics because the PM motor is a
generator where the standard triac difficult to commutate properly. The full-wave DC rectification is needed for PM
motors. Here is the schematic diagram of the circuit:
The BTA40 600B is suitable for general purpose AC power switching. The BTA40/600B can be used as ON/OFF
function in applications such as static relays, heating regulation, water heaters, induction motor starting circuits,
welding equipment… or for phase control operation in high power motor speed controllers, soft start circuits… Thanks
to his clip assembly technique, they provide a superior performance in surge current handling capabilities.
The circuit, which is conected directly to the mains, uses phase proportional control to eliminate current peaks at
switch ON. Thease peaks are also suppressed to some extent by varistor S20K275V. Use 16A slow blow fuse.
Applications
Motor Speed Control: Control of the motor speeds
The circuit that I chose for this assignment, is the motor project. The AC circuitwill be used to control the speed,
of a AC motor. This can be done by creating a Visual Basic program, to interface with the motor and the PC. The
input from the client, will be in decimal form and these digital sequences will be converted into binary codes using the
AC . The output voltage to the motor has a range of 0 and220v 500W.
Mixer or Sewing Machine Motor Speed Control
It will be effective to use simple half wavemotor speed controlwith small universal?ac/dc motors. Two amps RMS is
the maximum current capability. The control gives excellent torque characteristics to the motor because speed
dependent feedback is provided, even at low rotation speeds. By closing switch S1, thus bypassing the SCR, we can
achieve normal operation at maximum speed.
SCR circuit for Time Switch
R1 ………….. 15K ohm
R2 ………….. 600 ohm
R3 ………….. 4,7K ohm
R4 ………….. 22K ohm
R5 ………….. 68 ohm
C1 ………….. X
C2 ………….. 47uF – 25V
C3 ………….. 0,1uF – 600V
TR1-TR2 ……… 2N5306
SCR …………. 2N4444
PS ………….. Puas Switch
D1 ………….. 1N – 4003
Tags: 2N4444, 2N5306, Electronic Circuit Diagram, SCR circuit, SCR circuit for Time Switch
1000W AC Motor Speed Controller
This triac based AC motor speed controller circuit is designed for controlling the speed of AC motors like drill
machines, fans, vacuums, etc. The speed of the motor can be controlled by changing the setting of P1 potentiometer.
The setting of P1 determines the phase of the trigger pulse that fires the triac. The circuit incorporates a self-stabilizing
technique that maintains the speed of the motor even when it is loaded.
Notes:
It's easy to use. When you switch on the alarm - you have about 30 seconds to leave the building. When you return
and open the door - the Buzzer will sound. You have about 30 seconds to switch off the alarm. If you fail to do so - the
Siren will sound.
After about 10 minutes - the alarm will attempt to reset itself. If the trigger circuit has been restored - the attempt will
be successful. But - if the loop is still open - the attempt will fail - and the alarm will re-activate. Of course - you can
turn the Siren off at any time by switching off the alarm.
A conventional bell uses up to about 400ma. An electronic siren generally uses less. If you intend to draw a heavier
current from either the Buzzer or Siren terminals - the SCR in question will need to be bolted to a metal heatsink - and
the relay contacts may need upgrading.
If you don't want the timed "cut-off and reset" feature - leave out D5, D6, R11, R12, Q3, Q4, C6 and the Relay.
The Support Material for this alarm includes a detailed circuit description - a parts list - a step-by-step guide to
construction - and more.
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Simple AC Lamp Flasher Using SCR
The diagram illustrates how a compact AC operated mains bulb flasher can be made with the help of an SCR.
Transistors T1 and T2 along with the other passive components form a regenerative type of oscillator circuit, with C1
and R6 defining the rate of oscillations. P1 also to an extent can be used for altering the oscillation periods, however
its actual function is to optimize and sustain the regenerative process in the circuit, which is ideally achieved when P1
is set at around its mid-way region.
The DC pulses from the emitter of T1 are applied to the gate of the SCR, which responds by switching the connected
bulb to produce the desired flashing effects.
Parts List
R1, R2, R3 = 1 K, R4, R6 = 4K7, R5 = 1 M, P1 = 47 K, C1 = 10 uF / 25 V, C2 = 470 uF/ 25 V, C3 = 0.22 uF / 400 V,
D1 = 1N4007, SCR = C 106
NTE Triac Selection NTE SCR Selection
Heavy Duty 12 Volts Battery Charger
You can use a transformer with up to 12 amps output current with corresponding fuse value . Use No.12-14
stranded wiring to battery connection with heavy duty clips . Mount Rectifiers and SCR's on heatsink . You
can use a mA meter with a shunt resistor . See Metering a power supply .
Note The rectifiers and SCR's value as quoted can be changed to lesser values as required for lower current output .
Fig. 6.6: Flasher
A circuit to control the brightness of a globe or the speed of a motor is shown in figure 6.7
Fig. 6.7: Light bulb intensity or motor speed controller
If the main use for this circuit is to control the brightness of a light bulb, RS and CS are not necessary.
erformance of the triac T1. A fuse is also included for better safety.