Precision positioning system for long travel range and submicron resolution

Mukherjee, Arpita; Karmakar, Parnajyoti; Shome, Saikat Kumar; Sen, Sandip; Datta, Uma

doi:10.1109/ciec.2016.7513835

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…Full-step control can be equivalently described as rotation of phasor of length √ 2i n by an angle of π 2 with initial angular offset of π 4 . By rotating the phasor of length |i n | by a specific angle increment smaller than π 2 , one can achieve an increased positioning resolution and smoother mechanical operation resulting in sine-cosine microstepping [12][13][14]. Since phasor length does not change, the torque variation is effectively absent for motors with perfectly sinusoidal back-EMF [5].…”

Section: Stepper Motor Principle Of Operationmentioning

confidence: 99%

Influence of Microstepping Signal Shape on Shaft Movement Precision and Torque Variation of the Stepper Motor

2021

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Stepper motors are widely used in many applications where discrete, precise movement is required. There is a variety of dedicated stepper motor controllers (sometimes referred to as “step sticks”) available on the market. Those controllers provide a number of different motor control schemes that vary by aspects like current control method, reference current shape or maximum resolution increase (microstepping). The two most widely acknowledged signal shapes are sine-cosine microstepping and quadrature microstepping. The choice of the control scheme impacts torque output, torque variation, positioning error and maximum power supply requirements. This paper presents a family of generalised microstepping signal shapes, ranging from sine-cosine microstepping to quadrature microstepping. Derivation of signal shapes as well as their mathematical analyses are provided. Those signals are then implemented on the control board. A series of experiments is performed on a test bench to analyse the influence of different signal shapes on the performance of the motor in both load and no load conditions. The comparison of the new generalized shapes influence on the motor operation to the commonly used sine-cosine and quadrature control is provided.

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