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Victor SPX User Guide
vexpro.com ctr-electronics.com
Copyright 2018, VEX Robotics Inc., Cross the Road Electronics
Updated: 2021-11-29
12
Thermal Performance
To evaluate the Victor SPX’s thermal performance, a 40A load was applied using CIM motors and a
dynamometer. Before the test, a thermocouple was attached to the top of the Victor SPX PCBA. The test
was run for 15 minutes at 50% duty cycle. After the motor controller returned to room temperature, the
test was re-run at 100% duty cycle. During both tests, temperature data was recorded at regular intervals.
The results are plotted below.
Note:
Running a motor controller at 50% duty cycle causes the transistors to switch at a higher frequency.
This switching is what produces the most heat.
0
20
40
60
80
100
120
140
160
180
200
220
0
1.5
3
4.5
6
7.5
9
10.5
12
13.5
15
Tem
per
at
ur
e (
F)
Time (Minutes)
Max Temp vs. Time
(40A Continuous Load)
Victor SPX @ 50% Duty Cycle
VIctor SP @ 50% Duty Cycle
Victor SPX @ 100% Duty Cycle
Victor SP @ 100% Duty Cycle