Soft starter for power tools
Many what electric tools, especially of last years of release, are not equipped with the device of smooth start. Such tools are started by a powerful jerk, as a result of which there is an increased wear of bearings, gears and all other moving parts. Cracks appear in lacquer insulation coatings that are directly related to the premature failure of the tool.To eliminate this negative phenomenon, there is a not very complicated circuit on the integral power regulator, which was developed in the Soviet Union, but still it is not difficult to buy it on the Internet . Price from 40 rubles and above. It is called KR1182PM1. Works well in different regulatory devices. But we will build a soft start system.As you can see the components are not very much and they are not expensive.We also need a "closed" socket and a power cable with a plug.The design board is well sized to fit with large scissors. It is cut easily, simply and neatly.Place the components on the breadboard. For a chip it is better to solder a special socket, it costs a penny, but it makes work much easier. There is no risk that you overheat the legs of the chip, you do not need to be afraid of static electricity, and even if the chip burns out, you can replace it in a couple of seconds. It is enough to remove the burnt and insert the whole.Immediately solder the parts.Placing new parts on the board,checking the scheme.We carefully solder it.
Soft starter circuitNow consider the circuit itself.
- Microcircuit - KR1182PM1.
- R1 - 470 Ohms. R2 - 68 kilo.
- C1 and C2 - 1 microfarad - 10 volts.
- C3 - 47 microfarads - 10 volts.
- BT139-600 - 16 amps,
- BT138-800 - 12 amps,
- BTA41-600 - 41 amps.
Assembling the deviceYou can put any others that you have and which you are suitable for power, but you need to consider that the more powerful the triac, the less it will warm up, which means it will work longer. Depending on the load, you need to use a cooling radiator for a triac. I set the BTA41-600, you can not put the radiator at all, it is powerful enough and will not heat up during repeated short-term work, with a load of up to two kilowatts. I simply have no more powerful tool.If you plan to connect a more powerful load, then think about cooling. We will collect the parts for mounting the device.
Test workCheck the device at work. Caution! All circuit elements are under direct voltage of 220 volts! Life-threatening! Finally we assemble the device.
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