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Re: Any electronics nerds interested in Arduino/Atmel?
Quote:
Originally Posted by 87Skier
Motors have high inductance, so when you power them on by just connecting it to line voltage, it is essentially a short for a small window of time. This causes a voltage drop in the system while the motor comes up to speed, and also means that the current in the motor is extremely high during this time.
Soft-starting drastically reduces the startup current and the current through the motor coils.
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Although it sounds good, it is probably not a great idea to try soft starting a split-phase motor (cap start-cap run, or cap start-induction run) like is used on an air compressor. These motors pull a lot of amps on start up because they are high torque motors, and need to come up to speed quickly.
The type of motor usually used for soft-start is a 3-phase motor, and they are available with built-on or separate inverters/vfd module, so you can operate them from a single-phase power source
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