초록 ▼

A movable barrier operator having improved safety and energy efficiency features automatically detects line voltage frequency and uses that information to set a worklight shut-off time. The operator automatically detects the type of door (single panel or segmented) and uses that information to set a

A movable barrier operator having improved safety and energy efficiency features automatically detects line voltage frequency and uses that information to set a worklight shut-off time. The operator automatically detects the type of door (single panel or segmented) and uses that information to set a maximum speed of door travel. The operator moves the door with a linearly variable speed from start of travel to stop for smooth and quiet performance. The operator provides for full door closure by driving the door into the floor when the DOWN limit is reached and no auto-reverse condition has been detected. The operator provides for user selection of a minimum stop speed for easy starting and stopping of sticky or binding doors.

대표청구항 ▼

[ What is claimed is:] [1.]1. A movable barrier operator having automatic force settings, comprising:an electric motor;a transmission connected to the motor to be driven thereby and connectable to the movable barrier to be moved;a circuit for providing a pulse signal comprising a series of pulses;a

[ What is claimed is:] [1.]1. A movable barrier operator having automatic force settings, comprising:an electric motor;a transmission connected to the motor to be driven thereby and connectable to the movable barrier to be moved;a circuit for providing a pulse signal comprising a series of pulses;a motor control circuit, responsive to the pulse signal, for starting the motor and for determining the direction of rotation of the motor output shaft;a first force command device for setting a first force limit for use when the motor is rotating in a first direction;a second force command device for setting a second force limit for use when the motor is rotating in a second direction; anda controller responsive to the first force limit and to the second force limit for varying the length of the pulses in the pulse signal, effective for varying the motor speed during travel in the first direction and in the second direction.