Cam Positioners

Operating Principle

As shown in the following diagram, sin θ and cos θ voltage is applied to the two sets of fixed windings, S₁-S₃ and S₂-S₄, respectively, that are mechanically 90° out of phase. Observing the sin (θ - α) voltage induced in the rotating winding R₁-R₂ makes the Resolver a kind of rotating transformer that detects angles.

If the fixed winding is locked in position completely in phase with fixed winding S₁-S₃ (energized by sin θ voltage) for example, then sin θ voltage will be induced in R₁-R₂. When the rotating winding starts rotating, sin (θ - α) voltage will be induced in R₁-R₂ because of the cos θ voltage of the SR₂-S₄ winding that is 90° out of phase with the S₁-S₃ winding. (See the figure below.)

Allowable Thrust and Radial Forces

Thrust and radial forces represent the maximum vertical and horizontal forces applied to a shaft. The magnitude of these forces is proportionally related to the service life of the product (i.e., the mechanical service life of the bearings).

Origin Compensation

When a Resolver is linked to a mechanical system, the Resolver origin can be easily adjusted to match the machine origin if they are not the same. The process of aligning the two origins is called origin compensation.