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This is a single phase or three phase alternator, of special design, depending upon its capacity and application.The power developed by the prime mover is absorbed in a load bank.
Load control is obtained partly by armature control(coarse), and partly by field control, (fine).
APPLICATION
AC Absorption dynamometers are ideally suited for testing petrol engines for mopeds and electrical F.H.P. motors. Their main advantage lies in the fact that they are self aircooled and hence water cooling or additional air cooling is not required. This advantage is particularly significant in case of moped engines and F.H.P. motors, which are also aircooled.
Eddy current dynamometer is the latest type of absorption dynamometer popularly used for testing prime movers like diesel engines, petrol engines, electric motors, pneumatic motors, etc. These dynamometers offer good accuracy and excellent stability. Eddy current dynamometers offer excellent control response to electronic controller. The present trend in industry is to replace hydraulic dynamometers with eddy current dynamometers
The basic dynamometer system has two units :
Mechanical absorption unit, and Electronic controller, which incorporates digital indication of speed and torque. Their are three modes of operations like constant speed, constant torque and constant current. Highly powerful fail safe safeties to protect dynamometer are incorporated. Optional computer interface is also available.
The electronic unit plays an important role in operating dynamometer in different modes. ICA offers very efficient and reliable electronic controller. This unit displays torque/load and speed on digital indicator. It offers 3 modes of dynamometer operation by controlling excitation current in the coil through firing angle control of SCR's.
The speed is measured using magnetic reluctance type sensor and 60 teeth gear wheel. The sensor directly generates TTL output. The speed indicator has also builtin diagnostics to indicate failed sensor or broken sensor wires. The load/torque indicator uses 6 wire load cell system that offers high end accuracy. Electronic controller also incorporates safety circuits like dynamometer body temperature high (HI-T), cooling water low pressure safety (LO-P). High excitation current safety (HI-C). Over speed safety (HI-N) etc. If any safety limit gets crossed, the excitation current is cut off and LED of that particular safety glows. This helps to rectify fault. Optionally, we can provide computer interface and automation in engine/motor testing. APPLICATION
Eddy current dynamometer is an ideal tool for production testing of prime movers like diesel engines, gasoline engines, pneumatic motors and electric motors, industrial drives and transmission systems. It is equally suited for Research and Development work.
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This is a variable speed dynamometer, capable of both motoring and absorption duty. In case of absorption duty, the power absorbed by the prime mover under test is absorbed in the load bank. The load control is obtained partly by armature control (coarse) and partly by field control (fine). For motoring duty, a variable voltage D. C. Power source is required. Speed control is obtained partly by voltage control (coarse) and partly by field control (fine).
A universal D. C. dynamometer is an ideal tool for the Research and Development work. A typical application of universal dynamometer is in measuring Frictional Horse Power of I. C. engines.
This is a constant speed, single phase or three phase machine depending upon capacity and application.
SPECIAL FEATURES
APPLICATION
A. C. motoring dynamometer is ideally suited for determining the power requirement of utilities like pumps, fans, compressors etc.
