MOTORIZED ROLLER SHADE

摘要

A motorized window shade system (30) is described in which electrostatic charges, generated by a shade fabric (54) being reeled on to and off a roller (52) are connected to and grounded by a shaft (66) of a roller drive motor (100). The drive motor (100) is ultraquiet, and includes a worm gear drive and a single-stage reduction gear assembly (230) which delivers about 0.010 to 0.005 horsepower, with the motor shaft rotational velocity limited to no more than about 30 RPM. The motor (100) is mounted within a two-part housing (102,220) and is clamped between elastomeric acoustic dampers (240,241) connected between pedestals (230,231) extending from opposite interior wall surfaces to opposite side of the motor (100). An H-bridge drive circuit (301) powers the motor (100) under the control of a microprocessor which can be addressed by an infrared remote transmitter or by a wall mount control. Soft start and soft stop operation implemented by means of a computer program is employed to further reduce noise.