Elmomc SimplIQ Digital Servo Drives-Bell Command Referenc Instrukcja Użytkownika Pobierz pdf (Strona 221)

Chapter 4:Commutation and Pole

Identification

4.1. General Description

This chapter does not apply to DC brush motors

Commutation parameters are normally set using the support software.

The

SimplIQ drives fixed magnet motors. The fixed magnet interacts with the magnetic

field created by the motor windings.

If the winding’s field is kept in a constant direction, the motor will come to a steady state

with the windings field aligned with the fixed magnets.

Mathematically:

cos( )

FTE

TKI θθ=−

where:

θ is the rotor electrical angle. For brushless motors

θθ= , where ,

θ are the

shaft angle and the number of pole pairs respectively. For steppers,

θθ=

where n is

the number of steps.

θ is the “transformation angle” - the electrical angle of the windings field.

θθ− is the angle between the magnet and the field of the winding.

is the torque sensitivity. It is proportional to the strength of the magnet.

T is the motor winding torque.

I is the motor current.

The

SimplIQ drives can set the transformation angle

θ freely. The process of selecting the

transformation angle is called commutation.

Use the parameter CA[25] to set the direction of field movement when

θ increases.

SimplIQ for Steppers Application Note Commutation and Pole Identification

MAN-STECR (Ver. 1.1)

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Elmomc SimplIQ Digital Servo Drives-Bell Command Referenc Instrukcja Użytkownika Strona 221