Chief Delphi - Wiring a Fisher Gear Motor

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Re: Wiring a Fisher Gear Motor

OK,
Time to correct some items here.
1. The Victor has a lower switching frequency which does not react to motors with a higher winding inductance. It is this interaction which gives the Jaguar it's seemingly more linear response.
2. When used with PWM, both controllers have the same limitations in discrete steps. The max being ~127 in each direction less whatever deadband is in use. The hobby/servo PWM standard provides for this step count.
3. The Jaguar seems to react with the locking pins in the window motor. While documented, there is no real study of what is actually occurring. My personal opinion is that the switching frequency causes the pins to vibrate and alternately lock in place while the motor is driving.
4. The Jaguar uses FETs with lower "on" resistance but in the newer devices has reduced the parts count to two per leg instead of three. I will have to search back through my files but as I remember the Victor is 0.006 and the Jag is 0.004 ohms series resistance.
5. The Jag uses current sense and under internal software control will disable output when the current exceeds a set point. See the Jag spec sheet for details. The Victor does not sense current so the very small resistor used in the Jag is not present in the Victor.
5. Size is self explanatory.
6. The Victor does not have CAN at the present time. Customers have been asking for it.
7. Neither device has reverse polarity or output protection.
8. The Jaguar requires a very short reverse pulse when at full throttle to keep the bootstrap cap charged. It does not affect the available output power.

Re: Wiring a Fisher Gear Motor

Quote:

Originally Posted by Ether (Post 1132561)

The Jag's output curve is just as "smooth" and far more linear than the Vic's, as can be seen here.

Thanks for the link. We were wondering why our new drivetrain is so phenomenally easy to drive (same layout as last years bot, but controlled by black Jags). I no longer see any reason to use Victors.

Re: Wiring a Fisher Gear Motor

Quote:

Originally Posted by s_forbes (Post 1132836)

FYI:

If you find yourself using Vics and are unhappy with the output response curve, you can adjust the joystick values to compensate:

http://www.chiefdelphi.com/media/papers/2421

Re: Wiring a Fisher Gear Motor

Thanks for all the discussion about Jaguars and Victors, but that's a good topic for another thread. I hope we can wrap this up now.

P.S. - Another reason I prefer the Jaguars for our drive and shooter motors is that we are running CAN to them, which shawnz brought to my attention again.