Commutation, 5 commutation – ElmoMC SimplIQ Digital Servo Drives-Bell Getting Started User Manual

Page 30

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The SimplIQ for Steppers Getting Started & Tuning and Commissioning Guide

MAN-BELGS (Ver. 1.1)

30

By clicking the frequency graph button, you can also see the frequency response
of both the open and closed current controller.

Notes:

Setting greater phase margins reduces overshoot, but it also reduces the

bandwidth of the resulting current loop.

Apply the low-pass filter only if the current control is very noisy (this is very

rare).

Use greater current levels if you suspect the motor is working near magnetic

saturation.

Un-checking Measure all phases will result in shorter, but less accurate current

control tuning.

3.5 Commutation

Commutation tuning means the process of:

Defining which rotation direction is positive (this is a subjective user decision).
Learning the order and the polarity at which the motor phases were connected.
Learning the order and the polarity of the Hall sensors (if present).
Adjusting the parameters of the initial rotor position finding – this is essential

for a brushless motor to rotate.

Click the Commutation tab:

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