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Brush Type Servomotors

Principle Of Operation

The Permanent Magnet DC servomotor is basically a shunt field DC motor but designed to drive industrial machines under varying torque and speed conditions. Use of permanent magnets instead of electromagnets avoids separate DC source for the magnetic field, eliminates losses in filed system and reduces overall size considerably.

Construction

The Jayashree servomotors incorporate the following constructional features to ensure extreme reliability even under arduous and aggressive environment.

  • Housing precision machined from high strength alloy steel.
  • High strength strontium ferrite magnets.
  • The shaft made from alloy steel,suitably heat treated and precision machined to achieve optimum strength and rigidity.
  • Prelubricated and sealed ball bearings used for long maintenance free life with minimum friction torque.
  • Brush holders precision machined to ensure smooth movement of brushes.
  • Commutator built with silver bearing work hardened copper segments moulded to close tolerances to achieve minimum wear, maximum mechanical strength and stability. Mica insulation used between segment to ensure maximum dielectric strength.
  • Armature built with special low loss silicon steel stampings and wound with class 'H' enamelled copper wire and duly impregnated for high electrical and mechanical strength. Leads are hot stacked to commutator segments for excellent electrical contact and mechanical bonding.
  • The rotor dynamically balanced to ensure vibration free rotation,sparkless commutation.

Features

  • High performance with compact light weight construction.
  • Excellent servo characteristics and rapid response due to high ratio of peak torque to stalled torque and minimum armature inertia.
  • No speed for separate DC source.
  • No electrical losses in field system because of permanent magnet excitation.
  • Minimum overall size.
  • Enclosure in IP-55 grade of protection.
  • Optional accessories-Techo/Encoder.

Applications

  • Machine tools
  • Factory Automation and process control equipment
  • Medical Equipment
  • Actuators
  • Door operators
  • Industrial Robots
  • Printing machines
  • Paint mixing machines