Speed Control of AC motors (AC Drives). Dynamics of Motor Load Systems J moment of inertia kg-m2 instantaneous angular velocity rad/sec T developed torque.

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Presentation transcript:

Speed Control of AC motors (AC Drives)

Dynamics of Motor Load Systems J moment of inertia kg-m2 instantaneous angular velocity rad/sec T developed torque of the motor N.m. The load torque. Viscous Friction torque. B Viscous Friction coefficient.

Steady State Stability

Four-quadrant operation.

Pulsed Resistor Braking

Rectifier Regenerative Front End

Pulse-width-modulated inverters Pulse-width modulate inverter used to shape the output ac voltages to be as close to a sine wave as possible. One-leg switch-mode inverter.

Simulation of one leg PWM Inverter

Single ‑ phase full ‑ bridge inverter. PWM with Bipolar Voltage Switching PWM with Unipolar Voltage Switching

PWM with Bipolar Voltage Switching

PWM with Unipolar Voltage Switching Waveforms

THREE ‑ PHASE INVERTERS THREE ‑ PHASE INVERTERS driving 3-phase induction motor Waveforms 3phase INVERTERS driving variable 3-phase induction motor

Fig.4.22 Three ‑ phase PWM waveforms and harmonic spectrum.