|
Re: Jaguars...is this ok?
Russ,
In using your analysis and looking at a spinning motor as an equivalent voltage source this was my thought...
During that time when the motor is supplying current but the controller has turned on the alternate set of FETs, any additional back EMF current should return through the diodes in the FETs on the off side of the bridge. The effect of the H bridge, I think produces a complex load on the motor until the point at which the motor current supplied back to the bridge falls to a point at which the diodes stop conducting. I would suspect that during that period and until the motor starts moving in the opposite direction, the motor would then draw about stall current (or a little higher) but for a slightly longer time (msec) than normal motor start.
In looking at the two FET types (Jaguar vs Victor) it would appear that the Jaguar FETs have about half the ON resistance (6mohm vs 12mohm), a little more maximum current but the current is limited by package (note 1 on the data sheet.) The FET diode on the Victor is capable of higher current though.
__________________
Good Luck All. Learn something new, everyday!
Al
WB9UVJ
www.wildstang.org
________________________
Storming the Tower since 1996.
|