Brushless DC electric motor and tachogenerator assembly
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United States of America Patent
Stats
-
Mar 25, 1986
Grant Date -
N/A
app pub date -
Dec 13, 1984
filing date -
Dec 13, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A brushless, self-commutating DC motor including a tachogenerator for producing speed control signals, the motor having a cup-shaped housing fixed to an output shaft and carrying a cylindrical annular permanent magnet. The motor also includes a stator assembly having six rotor drive coils paired to provide a three phase driving coil system and a tachogenerator yoke and coil assembly forming part of the stator system. The rotor magnet has two tracks of multipolarization formed of an outer track of a plurality of driving magnetic poles and an inner track of tachogenerator magnetic poles of a greater number than the driving poles.
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