Accustep enables stepper motors to be used in place of servos

Paul Boughton
Motion Control Products is introducing the IMS Accustep motion control technology on stepper motors to prevent the loss of synchronisation due to transient or continued overload, extreme acceleration or deceleration, or excessive slew speed. This enables a stepper motor to operate safely at its maximum torque curve, so it is no longer necessary to size a motor with a 25-50 per cent torque margin. It may also enable a smaller frame size or shorter stack length motor to be used in some applications. Accustep also enables a system to ride through known transient overloads, which further eliminates the need for a larger motor. Variable current control can be used to reduce motor heating and energy consumption.
There are two MDrive Accustep product types available in NEMA23 and NEMA34 sizes: one is Step • Torque • Speed - which integrates the Accustep technology with a stepper motor, microstepping drive and internal encoder, featuring three Accustep operating modes (Step, Torque and Speed). The other is Motion Control, in which Accustep technology is integrated with a fully programmable motion controller, stepper motor, microstepping drive and internal encoder.
MDrive Accustep systems are said to be an economical alternative to brushless motors for a range of motion control applications such as point-to-point positioning, conveyor control, web handling, drilling, and low-end camming. With the addition of torque control, rotary and linear positioning to torque specifications is also possible.
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