micro-air easy start
all i can say is wow! best money ever spent on this total piece of **** 2007 fsakg33 Attitude toyhauler trailer. almost insulting to the micro-airs to be on the trailer. i had looked at micro-air...
Forum Discussion
when you first apply a voltage source to a AC synchronous motor several things occur. First, when the rotor is stopped, the voltage source is looking into an very low impedance inductive load. that means the voltage source needs to supply a very large initial current. But, as the motor starts to rotate, the motor rotation creates a "back emf" that is the rotating motor acts like a voltage source as well, bucking the incoming voltage source. Once the motor is up to speed the current draw is determined by the inductance and the back emf of the rotating motor.
So, to start an AC synchronous motor you either (a) wack it with a very stiff voltage source, or (b) limit the starting current in some manner until the motor is synchronized and let it start rotating and keep increasing the current (and likely voltage) to get it up to full voltage to keep the current down.
I suspect micro air is using technique (b)
method (b) is a pretty common approach to starting large motors, and with modern electronics, lots of ways to accomplish it effectively, reliably, and at reasonable cost.
So, to start an AC synchronous motor you either (a) wack it with a very stiff voltage source, or (b) limit the starting current in some manner until the motor is synchronized and let it start rotating and keep increasing the current (and likely voltage) to get it up to full voltage to keep the current down.
I suspect micro air is using technique (b)
method (b) is a pretty common approach to starting large motors, and with modern electronics, lots of ways to accomplish it effectively, reliably, and at reasonable cost.
