pdf for speed control of universal motor using scr

ABSTRACT

In an SCR circuit controlled universal motor, means is provided for smooth speed control at all speed settings especially low settings which comprises a series wound stator field as part of the motor and at least one closed conductor loop of wire encircling the stator magnetic flux path.

Features

Built in AC & DC Power Supply
On board firing circuits
Firing angle control: 0 to 180 degree
Speed measurement: RPM counter circuit with LCD display
Selection of open/close loop control
SCR circuit : Bridge rectifier and anti-parallel
connected SCR
Isolation between SCR power circuit and firing circuit
Test point to observe output of different blocks
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