The excitation winding of a brushless excitation is powered by a sub-exciter that sends electrical energy through a thyristor to the AC exciter, which is generally used for motors with a high AC frequency. The thyristor-controlled current converter is controlled by the excitation controller, which can be built from a DSP chip in an era of advanced digital chips. The cost effectiveness of the control circuit can be greatly improved. The excitation winding of the exciter generates the corresponding excitation current to excite the AC exciter. The frequency of the AC exciter armature voltage is generally 1 to 2 times higher than the working frequency. The potential induced by the AC exciter is rectified by an uncontrolled rectifier bridge to produce a DC current to supply the generator excitation winding.

Features of the brushless excitation method:

(1) Brushless excitation has no contact parts, carbon brushes and slip rings, making it simple to maintain and highly reliable for long-term continuous operation with little or no maintenance.

(2) Since there are no rotating contacting conductive parts, no sparks will be generated, making it suitable for operation in harsh environmental conditions such as flammable gases and dust.

(3) The reliability of the AVR design is easy to achieve due to the small excitation power.

(4) For the main engine, it is a self-excited synchronous generator, easy to run in parallel.

(5) Compared with brushed generators, it is larger and consumes more effective materials.

UNITROL 1010

UNITROL 1010-0002 LIGHT 3BHE035301R0002

UNITROL 1010-0003 BASIC 3BHE035301R0003

UNITROL 1010-0004 BASIC + SYNC 3BHE035301R0004

UNITROL 1020

UNITROL 1020-0003 BASIC 3BHE030579R0003

UNITROL 1020-0004 BASIC + SYNC 3BHE030579R0004

UNITROL 1020-0006 FULL 3BHE030579R0006

UNITROL 1020-0007 FULL + PSS 3BHE030579R0007

UNITROL 1000-PM40

UNITROL 1000-PM40 3BHE015411R0001

ABB has an extensive product line that includes a full range of power and distribution transformers, high, medium and low voltage switchgear products, AC and DC power transmission and distribution systems, power automation systems, a wide range of measurement devices and sensors, real-time control and optimisation systems, robotics hardware and software and simulation systems, energy-efficient motors and drives, power quality, conversion and synchronisation systems, fusing and switching devices for the safety of power systems. These products are used in a wide range of industrial, commercial, power and utility applications.

Power Systems Division: The Power Systems Division offers a complete range of systems and services for transmission and distribution networks and power plants worldwide, with a focus on substations and substation automation systems. In addition, the division offers Flexible AC Transmission Systems (FACTS) and High Voltage Direct Current (HVDC) transmission systems as well as grid management systems. In the Power Generation business area, the Power Systems Division offers instrumentation products as well as control and auxiliary devices for power plants.

Discrete Automation and Motion Control: The Discrete Automation and Motion Control segment supplies products, solutions and services that help customers improve productivity and energy efficiency. Its motors, generators, drive systems, programmable logic controllers, power electronics and robotics products are used in a wide range of automation applications in the areas of power, motion and control. The business segment's leadership in the wind turbine industry and its growing product line in the solar sector will further contribute to the development of the existing skills, channels and operating platforms of the Discrete Automation & Motion Control division in the industrial sector.

Power electronics: SYNCHROTACT contemporaneous equipment, control systems.

Control systems: 800xA, Advant open control system with Master software, Advant open control system with MOD 300 software, Freelance, Melody series, SATT, Symphony DCI series, Symphony Harmony INFI 90 series, Compact 800