Technisches
Handbuch
SMCI33
Overview
1 Overview
Introduction
The stepper motor control SMCI33 is an extremely compact and cost-effective
constant current power output stage with integrated Closed-Loop current control.
Due to the great capacity and functions available, it offers designers and developers a
rapid and simple method of resolving numerous drive requirements with less
programming effort.
It is used for controlling standard stepper motors (including with attached encoders) or
motors with integrated encoders or brakes.
Variants
The SMCI33 is available in the following variants:
•
SMCI33-1: with USB interface (drivers necessary)
•
SMCI33-2: with RS-485 interface
SMCI33 functions
The stepper motor control SMCI33 contains the following functions:
•
Microstep -1/1 – 1/64 final output stage (step resolution of up to 0.014° in motor
with a step angle of 0.9° in 1/64 step mode)
•
Closed-Loop current control (sinusoidal commutation via the encoder)
•
Rotation monitoring for optional encoder
•
RS485 or USB interface for parameterisation and control
•
Sequence programs with NanoJ
•
Network capability up to 254 motors
•
Easy programming with the NanoPro Windows software
Closed-Loop current control (sinusoidal commutation via the encoder):
In contrast to conventional stepper motor positioning controls where only the motor is
actuated or the position adjusted via the encoder, sinusoidal commutation controls the
stator magnetic field via the rotary encoder as in a servomotor. The stepper motor acts
in this operating mode as nothing more than a high pole servomotor, i.e. the classic
stepper motor noises and resonances vanish. As the current is controlled, the motor
can no longer lose any steps up to its maximum torque.
If the controller recognizes that the rotor is falling behind the stator field due to
overload, adjustments are made with optimal field angle and increased current. In the
opposite case, i.e. if the rotor is running forward due to the torque, the current is
automatically reduced so that current consumption and heat development in the motor
and controller are much lower compared to normal controlled operation.
Issue: V 2.2
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