Yaskawa Electric Servo Motor 3000r/min AC SERVO MOTOR 400W InsB SJME-04AMB4C

SJDE-01APA

SJDE-02APA

SJDE-04APA

SJDE-04APA+SJME-04AMB41

SJDE-08APA

SJME-01AMA41

SJME-04AMA41

SJME-04AWA41

SJME-08AWA41

The stator voltage and flux-linkage space vectors can be similarly obtained in the general reference frame. Similar considerations hold for the space vectors of the rotor voltages, currents and flux linkages. The real axis (rα) of the reference frame attached to the rotor is displaced from the direct axis of the stator reference frame by the rotor angle, θr. As shown, the angle between the real axis (x) of the general reference frame and the real axis of the reference frame rotating with the rotor (rα) is θg-θr. In the general reference frame, the space vector of the rotor currents can be expressed as

The motor model voltage equations in the general reference frame can be expressed by using the transformations of the motor quantities from one reference frame to the general reference frame introduced. The AC induction motor model is often used in vector control algorithms. The aim of vector control is to implement control schemes which produce high-dynamic performance and are similar to those used to control DC machines. To achieve this, the reference frames may be aligned with the stator flux-linkage space vector,reference frame attached to the rotor flux linkage space vector with direct axis (d) and quadrature axis (q). After transformation into d-q coordinates the motor model follows:

In adjustable-speed applications, AC motors are powered by inverters. The inverter converts DC power to AC power at the required frequency and amplitude. Figure 3-5 illustrates a typical 3-phase inverter

An Insulated-Gate Bipolar Transistor (IGBT) is controlled by a MOSFET on its base. The IGBT requires low drive current, has fast switching time, and is suitable for high switching frequencies. The disadvantage is the higher voltage drop of the bipolar transistor, causing higher conduction losses.