Chapter 10 MICROSTEPPING

Microstepping is an electronic control technique that propotions the current in a step motor’s windings to provide additional intermediate positions between poles. Produces smooth rotation over a wide speed range and high positional resolution.

Microstepping is a way of moving the stator flux of a stepper more smoothly than in full- or half-step drive modes. This results in less vibration, and makes noiseless stepping possible

down to 0ÊHz. It also makes smaller step angles and better positioning possible.

There are a lot of different microstepping modes, with step lengths from 1⁄3-full-step down to 1⁄32-fullstep or even less. Theoretically it is possible to use non-integer fractions of a full-step, but this is often impractical.

Microstepping is a way of moving the stator flux of a stepper more smoothly than in full- or half-step drive modes. This results in less vibration, and makes noiseless stepping possible

down to 0 Hz. It also makes smaller step angles and better positioning possible. There are a lot of different microstepping modes, with step lengths from 1⁄3-full-step down to 1⁄32-fullstep or even less. Theoretically it is possible to use non-integer fractions of a full-step, but this is often impractical.

T=T_H × sin(f_s - f_r)

where f_s and f_r  are given in electrical degrees.

The relationship between electrical and mechanical angles is given by the formula:

fel = (n¸4) ´ fmech

where n is the number of full-steps per revolution.