Wiring a Fisher Gear Motor

[Al Skierkiewicz]

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.