A motor actuator of a climate control system includes an specialized electric
motor
with a motor housing enclosing an encoder ring on a motor shaft having a plurality
of opposite encoder-segment sets with encoder brushes on the housing wiping the
encoder ring and thereby forming an encoder circuit through opposite segments of
the encoder-segment sets. The electric motor further includes power and encoder
terminals positioned externally of the motor housing with at least one power terminal
being electrically coupled to one of the power brushes and at least one encoder
terminal being electrically coupled to one of the encoder brushes. A control head
of the system includes a continuity pulse counter coupled to the at least one encoder
terminal for creating pulses representative of impedance in the encoder circuit
and, therefore, movement of the motor shaft and a damper linked thereto.
