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 UIM24204/24208
7.3
Nonlinear Acceleration
In order to minimize the response time, make the motor reaching the desired speed in the
shortest time without sacrificing stepping accuracy, user may want to utilize the nonlinear
acceleration/deceleration capability of the UIM242XX controller. Experiments proved that
only by using the nonlinear acceleration, can the NEMA 17/23 reach a 6600 RPM (half step)
speed in 0.5 seconds and a 4000 RPM (quad step) speed in 0.25 second.
UIM242XX controllers are equipped with the Nonlinear Acceleration Control function as
describe below.
1.
If user input desired speed is higher than a certain value (i.e. the Maximum Starting
Speed, defined by user through instruction), and current motor speed is lower than the
Max. Starting Speed, then the motor speed is first stepped-up to the Max. Starting
Speed and then uniformly accelerated according to the user preset acceleration rate.
This process is shown in figure 7-3.
Figure 7-3: Nonlinear Acceleration Control (case 1)
ω (Speed)
Uniform Acceleration
Desired Speed
Step Acceleration
Maximum Starting Speed
Current Speed
Time
2.
If user input desired speed is less than the Max. Starting Speed, then the motor speed
is stepped-up to the desired speed immediately, as shown in figure 7-4.
Figure 7-4: Nonlinear Acceleration Control (case 2)
ω (Speed)
Step Acceleration
Maximum Starting Speed
Current Speed
Desired Speed
Time
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M24220101008EN
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