hielectromechanical generator is a device capable of producing electrical power from mechanical energy, usually the turning of a shaft. When not connected to a load resistance, generators will generate voltage roughly proportional to shaft speed. With precise construction and design, generators can be built to produce very precise voltages for certain ranges of shaft speeds, thus making them well-suited as measurement devices for shaft speed in mechanical equipment. A generator specially designed and constructed for this use is called a tachometer or tachogenerator. Often, the word “tach” (pronounced “tack”) is used rather than the whole word.

dc and ac tachogenerator working principle ppt

DC Tachogenerators give you accurate DC Voltage output proportional to speed of its mover. They are widely used in applications for feedback and display purposes.

Specifications:

Current: Up to 200 mA
Speeds: Up to 10000 rpm
Voltages: 4V to 200 V / 1000 rpm
Standard Options (EXTRA) :

Temperature Compensation
Terminal Box / Connector
Foot Mounting
Extended Shaft
Standard Features :
Compact and Light Weight and can substitute a range of imported / indigenous tachos
High Linearity
Low Ripple
High Stability and Extreme Reliability in Hostile Industrial Environments
PRINCIPLE OF OPERATION :


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The DC Tachogenerator is a speed transducer, which develops DC voltage proportional to speed of the motor connected to it.
Permanent Magnetic field eliminates the need of external excitation and offers extremely reliable and stable outputs. The accuracy of the tachogenerator decides the maximum accuracy of speed of the controlled machine.

FEATURES :

The tachogenerator incorporates following features to ensure reliable and long service in most hostile environments.

Silver graphite brushes to ensure long life, minimum voltage drops, and spark free commutation.
Prelubricated and sealed precision ball bearing used for long maintenance free operation.
Brush holders and brushes designed to ensure smooth movements, equal brush tension and spark free operation.
Electrolytic grade copper segments molded and machined to close tolerances in commutator for sparkless commutation and minimum wear. Use of mica insulation between segments to offer maximum dielectric strength and stability.
Armature built with special silicon steel stampings and wound with polyester grade class ‘F’ enameled wire and impregnated for high electrical and strength.
Armature dynamically balanced for vibration free rotation, sparkless commutation and low ripple content.
Totally enclosed construction to offer protection from hostile industrial environments.
Easy accessibility of brushes and commutator for maintenance.
Powder coated / Stowing Paint for good finish, corrosion free outer body.
OPTIONS :

Any deviation in electrical and mechanical details from our standard models.
Temperature compensation.
Foot mounting, terminal box, and flexible couplings.
Hollow shaft versions available.