Abstract:
AN ELECTRIC MOTOR WITH A LOW INERTIA ARMATURE HAVING A TRANSVERSE COOLING AIRFLOW FROM A HIGH PRESSURE CHAMBER TO A LOW PRESSURE CHAMBER IN A DIRECTION PARALLEL TO AND IN CONTACT WITH THE CIRCUMFERENCE OF THE ARMATURE.
Abstract:
A permanent magnet, direct current capstan motor for use in moving magnetic recording tape in a start/stop mode at a high repetition rate, wherein a lightweight motor armature is shaftconnected to a tape drive capstan by means of a nonmetallic, ceramic, monocrystalline aluminum oxide shaft. The capstan is adhesively attached to one end of the ceramic shaft. The shaft performs the multifunctions of maintaining a high mechanical resonant frequency for the motor''s rotating assembly, magnetically isolating the magnetic recording tape from the motor''s magnetic field, and heat insulating the capstan''s adhesive interface to the shaft from the heat source formed by the motor''s armature.