Compact power actuator for window shades

摘要: A window shade (60) having a power actuation system. The includes fixed member (63); rotatable (62) that is relative to the member; reversible motor (64) mounted member, wherein mechanism for driving such rotation of in first direction deploys material and second stows material; control circuit (66) coupled set leads motor, switches among at least three operational states, including: hold state which are shorted resist rotation, deploy connected source material, stow reverse material.