Microswitch Corp ( Pacific Scientific ) Catalog listing : 2VM61-000-2 From the label on the motor : ============================= Torque constant : 4.6 Oz x In / Amp. Rotor Inertia : .00047 Oz x In x Sec sq. Terminal Resistance : 1,59 ohm rated : 24 Volts rated : 3.8 Amps RMS This motor is used as a Capstan Motor on the Master Loop Bin of a high speed cassette duplicator. The motor runs at around 3000 rpm (exactly.. 2952rpm) The measured operating current is : xx Amp at : xx V across the motor.(power at normal situation : xx W ?) The power supply available is plus/minus 24 Vdc This is applied through a simple linear servo amplifier. (which we can adapt) whose control signal comes from a glass tachodisc (our own design) mounted on an aluminium holder on the back shaft of the motor(about 15 mm needed)