Tachometer assembly for magnetic motors
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United States of America Patent
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-
Dec 11, 1984
Grant Date -
N/A
app pub date -
Sep 30, 1982
filing date -
Sep 30, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A tachometer assembly is provided for use with electrical rotary magnetic motors. The assembly includes a conventional brushless DC motor (12) having a radially polarized main field ring magnet (24) forming the rotor (16) about a stator (18). The tachometer portion includes a commutator ring magnet (26) formed on one edge of the main field magnet (24) and an axially displaced circuit board (14) including one or more unbranched conducting traces (40). The commutator ring (26) includes a plurality of alternately axially polarized segments (27) which induce sinusoidal signals in the conductive traces (40) as the rotor (16) is rotated with respect to the circuit board (14). The tachometer assembly is utilized to generate rotational velocity and analog positional data for manipulation and control of the motor (12). The primary uses are in servo control mechanisms in the data processing and computer peripheral industries.
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