Controls and Control Theory Commons^™

Independent Moisture-Sensitive Automatic Watering System, Jessica Sherbon

Electrical Engineering

With the availability of home improvement supplies, plant owners can quickly and easily set up an automatic system that waters their gardens based on a specified schedule. However, most of these systems require an electric outlet or water faucet making them unusable in locations where installed water and power lines do not exist, such as apartment balconies. This project defines a small-scale automated watering system that runs independently of installed water and power lines. The system takes water from a reservoir, such as a tank or bucket, and supplies that water to individual plants via a drip system. The design …

Polar Field Oriented Control With 3rd Harmonic Injection, Martin Todd Hess

Master's Theses

Abstract

POLAR FIELD-ORIENTED CONTROL

with

3^RD HARMONIC INJECTION

Martin Todd Hess

Field Oriented Control (FOC), also known as vector control, is a widely used and well documented method for controlling Permanent-Magnet Synchronous Motors (PMSM) and induction motors. Almost invariably the orientation of the stator and rotor (field) fluxes are described in rectangular coordinates. In this thesis we explore the practicality of using polar coordinates.

Third harmonic injection is also a well-known technique that allows full utilization of the bus (DC-link), thus allowing the motor to run to full base speed without the use of field weakening. This technique potentially …