Brushless DC Servo Motor Design and Development

It is an ever going effort for electric motor designs to get maximum power in minimum volume with the highest efficiency. Nowadays, permanent magnet (PM) motors may suit this idea best among many motors.

In PM motors, needed field flux to produce electromagnetic power is supplied by magnets fit on stator or rotor instead of lossy field windings supplied with currents.

With the availability of strong magnets in the market (ex. NdFeB), studies on PM motors have gradually increased in the last 15 years. As a result PM motors have found application in several areas such as generators, traction and propulsion motors, space crafts, medical instruments.

As the Intelligent Energy Conversion Group, we are currently working on design of PM motor that is to be a pioneering work for forthcoming studies. The motor is designed to have 3-phases, 8-poles and to be operated in 0-3000rpm speed range. Also the end-product is to be integrated on a stabilizing platform for performance analysis.

The mechanical and electrical designs of the motor are done by our group. As a result, it is expected to build a strong know-how on PM motor design. In light of gained knowledge, it will be our next step to build more powerful and more efficient electric motors.

-----------------------------------------------------------------------------------------------------------------------------------------------------

TÜBİTAK Distribution Automation System (TÜDOSİS)

n this project, a SCADA system, which meets the international standards, uses latest technologies and open-system archtitecture, was designed for electrical distribution system of European side of Istanbul (BEDAŞ), and Remote Terminal Unit's (RTU's) which is the main part of the system, hierarchical communication structure and control center were developed. Although the system has the ability of data collection and monitoring, and remote control as standard functions, the application of those functions to the output feeders of 34 kV substations and 34/0.4 kV distribution transformers makes the system unique. Detection of the faulty place on the feeder, isolation of the fault, enabling the reenergization either full automatically or by operators manually, are the most important functions of the feeder automation. The project was sponsored by BEDAŞ.

SYSTEM FEATURES:

A. TÜDOSİS Automatic Fault Detection and Isolation:

• Fault on the feeder or in the distribution transformer center is detected
• The location of the fault is determined
• Fault region is isolated by automatic switching operations
• Transmission of the data of faulty region and fault isolation to the regional control center lets operators be informed about the case
• Non-energized feeders can be energized full automaticly, half automaticly (partially by system, partially by operator), or by operator

B. TÜDOSİS Data Acquisition and Observation:

• From the distribution transformer center:
• State of load break switches
• State of thermo relay on the low voltage side of the transformer
• State of low voltage feeder fuses
• State of illumination contractor
• State of thermometer and Bucholz relays
• Analog values from powermeter

• From the feeder outgoing on the substation:
• Switch state of circuit-breaker
• State of phase and earth relays
• Analog values from powermeter

C. TÜDOSİS Remote Control:

• In the distribution transformer center:
• Load breaker switches/circuit breakers 
• Illumination contactors
• On the feeder outgoing the substation:
• Circuit-breakers can be controlled remotely by regional control center operator by open and close operations