Dynamical Operation, Vector Control, DTC and Encoder-less Operation Summary Dynamical Operation, Vector Control, DTC and Encoder-less Operation

©Copyright Ned Mohan 2005, by permission from MNPERE Seamless discussion of dynamic control and encoder-less operation ©Copyright Ned Mohan 2005, by permission from MNPERE

What is an Electric-Motor Drive? Harnessing of Wind Energy Hybrid Electric Vehicles ©Copyright Ned Mohan 2005, by permission from MNPERE

©Copyright Ned Mohan 2005, by permission from MNPERE Power Processing Unit Reference Book: First Course on Power Electronics by Ned Mohan, published by MNPERE (See www.MNPERE.com for details). ©Copyright Ned Mohan 2005, by permission from MNPERE

Equivalent Windings in A Squirrel-Cage Rotor Figure 2-5 Rotor circuit represented by three-phase windings. (b) Stator Rotor Mutual

Dynamic Analysis of Induction Machines in Terms of dq-Windings

Representation of Stator MMF by Equivalent dq Windings

Mutual Inductance between dq Windings on the Stator and the Rotor

Mathematical Relationship between dq and phase Winding Variables (abc to dq)

Mathematical Relationship between phase Winding Variables and dq (dq to abc)

Derivation of Voltages in dq Windings

Electromagnetic Torque on the Rotor d-Axis

Electromagnetic Torque on the Rotor q-Axis Net Electromagnetic Torque

Simlink-based dq-Axis Simulation of Induction Motor

Simulation Results

Mathematical Description of Vector Control

Motor Model with the d-Axis Aligned with the Rotor Flux Linkage Axis

Dynamic Circuits with the d-Axis Aligned with the Rotor Flux Linkage Axis Calculation of Calculation of Torque

D-Axis Rotor Flux Dynamics

Motor Model

Speed and Position Loops for Vector Control Figure 5-8 Vector controlled induction motor drive with a current-regulated PPU.

Design of Speed Loop

Simulation of CR-PWM Vector Controlled Drive using Simulink

Simulation Results of a Vector Controlled Induction Motor Drive

Space-Vector Pulse-Width-Modulated (SV-PWM) Inverters Advantages Full Utilization of the DC Bus Voltage Same simplicity as the Carrier-Modulated PWM Applicable in Vector Control, DTC and V/f Control

Synthesis of Stator Voltage Space Vector

Basic Voltage Vectors

Synthesis of Voltage Vector in Sector 1

Limit on the Amplitude of the Stator Voltage Space Vector (sinusoidal PWM)

Synthesis using Carrier-Modulated PWM

Synthesis of Space Vector using Carrier-Modulated PWM in Simulink

Control Waveforms for Carrier Pulse-Width-Modulation

Direct Torque Control (DTC) and Encoder-less Operation of Induction Motors

DTC System Overview Measured Inputs: Stator Voltages and Currents Estimated Outputs: 1) Torque, 2) Mechanical Speed, 3) Stator Flux Amplitude and 4) its angle

Principle of DTC Operation

Calculation of Stator Flux: Calculation of Rotor Flux: Estimating Mechanical Speed: where Estimating Torque:

Inverter Basic Vectors and Sectors

Stator Voltage Vector Selection in Sector 1

Selection of the Stator Voltage Space Vector Effect of Voltage Vector on the Stator Flux-Linkage Vector in Sector 1. increase decrease

Effect of Zero Stator Voltage Space Vector

DTC in Simulink

Fig. 2 Torque Waveforms.

Fig. 3 Speed Waveforms.

Fig. 4 Stator Flux.

Fig. 5 Stator and Rotor Fluxes.

Vector Control of Permanent-Magnet Synchronous-Motor Drives

Non-Salient Permanent-Magnet Synchronous Motor

Non-Salient Permanent-Magnet Synchronous Motor (Continued)

Controller in the dq Reference Frame Figure 9-3 Controller in the dq reference frame.

Vector Control of a Permanent-Magnet Synchronous-Motor Drive

Simulation Results