Lebowski
10 MW
I've been wondering about a new motor/controller idea I have...
Most (all?) of our BLDC motors are 3 phase motors. 3-phase is used in the mains power
distribution network because you don't need a return wire for the ground, in essence
the currents in the 3 phases cancel each other out such that no current is flowing
in the ground wire... which is therefore omitted.
But for our motors this doesn't really matter.... right ?
Would a two-phase motor not make more sence ? Ok, is has 4 wires instead of 3 but
this is no biggie. More interesting is that one phase follows a sine while the other
phase follows a cosine funtion (versus time). If you power the motor by a controller
that implements a negative resistor the currents will also be sine and cosine.
Power from 1 winding will be sin^2 while from the other will be cos^2. Which means
power delivery is constant over time without any ripple.
Also, even more interesting, power consumption will also be constant meaning that the
engine/controller will drawn a constant current (assuming constant battery voltage) from
the battery. Lithium batteries like a constant current much better than a pulsed one. Also
there would be less influence from wiring inductance...
what do you guys think ?
Most (all?) of our BLDC motors are 3 phase motors. 3-phase is used in the mains power
distribution network because you don't need a return wire for the ground, in essence
the currents in the 3 phases cancel each other out such that no current is flowing
in the ground wire... which is therefore omitted.
But for our motors this doesn't really matter.... right ?
Would a two-phase motor not make more sence ? Ok, is has 4 wires instead of 3 but
this is no biggie. More interesting is that one phase follows a sine while the other
phase follows a cosine funtion (versus time). If you power the motor by a controller
that implements a negative resistor the currents will also be sine and cosine.
Power from 1 winding will be sin^2 while from the other will be cos^2. Which means
power delivery is constant over time without any ripple.
Also, even more interesting, power consumption will also be constant meaning that the
engine/controller will drawn a constant current (assuming constant battery voltage) from
the battery. Lithium batteries like a constant current much better than a pulsed one. Also
there would be less influence from wiring inductance...
what do you guys think ?