Brushless servo motor construction and alignment

Claim 1

In a brushless servo motor having means for providing accurate and repeatable correlation between the rotational position of a rotatable shaft couplable to a load and feedback signals from a rotational position sensor, said motor having a plurality of components including: a rotor having a rotatable shaft with a plurality of magnets mounted thereon, a stator surrounding said rotor and having a plurality of windings mounted thereabout, a motor housing receiving said stator and said windings, and a position sensor having a rotor and a stator for developing motor rotor position feedback signals, the improvement wherein said motor further has: means (29) for a defined positioning of said stator windings (17) about said motor housing; means (31) for a defined positioning of said magnets (18) on said rotatable shaft (22); means (35) for a defined angular orientation of said position sensor rotor relative to said magnets (18); means (37) for a defined positioning of said sensor stator (28) relative to said motor housing (16), means (44) for repeatably orienting said rotatable motor shaft (22) in a predetermined angular position relative to a load shaft; and means (58) for orienting said motor housing in a predetermined angular position relative to a stationary portion (53) of a load, whereby said respective positioning and orienting means causes a defined reference value of said position sensor feedback signal to correspond to a defined angular relationship between said motor shaft (22) and said motor housing (16), and whereby further, replacement of said motor or any of said components thereof with positioning and orientation thereof by said respective means will produce a repeatable said sensor/shaft signal in operation of said servo motor.