Voltamp Controls manufactures permanent magnet AC synchronous motor. This offers instant start, stop and reverse functions and has the following features: basic constant synchronous speed at 50 Hz is 60 RPM; higher and reduced speed through gears assembly; built-in overload protection-motor stops, if overloaded, without burnout; popular choice for precise positioning application; and, starting, operating and stalling currents are identical. Typical applications: servo voltage stabilizers, DC drives, constant current rectifiers, valve controls, automated welding equipment, X-ray scanning, paper feed, tape dispensers, fluid metering, textile edge guide control, etc. These motors are usually operated from single phase source with RC phase shifting network. They are essentially two phase motors and do not require phase-shifting network when used with two-phase power supply. The speed of the motor is directly proportional to the applied frequency, and the motor reaches its full synchronous speed typically within 5 to 25 milli seconds. The output torque of the motor is linearly proportional to the applied input voltage. For intermittent operation, this characteristic can be used to provide increased torque. The use of reduction gears with the motor provides increased torque and decreased speed. Output speed is decr&sed and torque increased by the factor of the gear ratio used. Gear losses are typically around 10% per mesh. Step-down gearing offers even greater gain in inertial load rating since the inertia moving capability increases by the square of the gear ratio.