New Yaskawa AC SERVO MOTOR 200V 100W SGM-02U2HA12 Industrial Servo Motor

An induction motor is supplied by a three-phase ac system in which the threephase currents are phase-shifted by 120ºe or 2π/3 electrical radians. The three phase currents are thus defined as (2.1)[39].

where ia is the current in phase A, ib is the current in phase B, ic is the current in phase C, Im is the peak fundamental frequency value of each phase current, ω is the fundamental electrical angular frequency in (rad/s), φ is the lag power factor angle in e.rad, and t is time (s). Due to the symmetric phase-shift of 120ºe in the phase currents, the sum of the three phase currents is zero as given by (2.2).

The phase voltages are also phase-shifted by 120ºe or 2π/3 e.rad. Considering the phase voltage, va, as reference, the three phase voltages are defined as (2.3).

where, va is the phase voltage A, vb is the phase voltage B, vc is the phase voltage C, and Vm is the peak fundamental frequency value of the phase voltage. In polar form, the three phase voltages can be written as (2.4).