Door operator for controlling a door and method of same
First Claim
1. A door operator for controlling operation of a door, the door operator having a motor to open the door against a spring force, said door operator further comprising:
- a door position sensor for transmitting a signal indicative of door position; and
a controller for;
controlling a motor current to generate a predetermined motor force to open the door to a predetermined angle;
receiving the signal from the door position sensor and determining a door position and a door speed based on the signal;
measuring the time for the door to reach the predetermined angle from a closed position;
measuring the current to hold the door at the predetermined angle;
converting the measured current to an equivalent force of the motor acting on the spring, which represents the spring force;
determining a first torque value acting on the door based on the spring force;
determining a second torque value acting on the door based on the predetermined motor force to open the door to the predetermined angle;
subtracting the first torque value from the second torque value to determine a net torque acting on the door; and
calculating a door moment of inertia based on the net torque and the time for the door to reach the predetermined angle from the closed position.
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0 Petitions
Accused Products
Abstract
A door operator for controlling operation of a door, the door operator having a motor to open the door against a spring force, the door operator further comprising a door position sensor for transmitting a signal indicative of door position; and among other things, calculates a door moment of inertia based on a net torque and the time for the door to reach a predetermined angle from the closed position. Also provided is a door operator that compares door speed to a desired door speed based on a door speed-position profile and generates a door speed error signal and minimizes the door speed error signal by adjusting the braking load resulting from charging a chargeable battery using the motor as a generator.
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Citations
10 Claims
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1. A door operator for controlling operation of a door, the door operator having a motor to open the door against a spring force, said door operator further comprising:
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a door position sensor for transmitting a signal indicative of door position; and a controller for; controlling a motor current to generate a predetermined motor force to open the door to a predetermined angle; receiving the signal from the door position sensor and determining a door position and a door speed based on the signal; measuring the time for the door to reach the predetermined angle from a closed position; measuring the current to hold the door at the predetermined angle; converting the measured current to an equivalent force of the motor acting on the spring, which represents the spring force; determining a first torque value acting on the door based on the spring force; determining a second torque value acting on the door based on the predetermined motor force to open the door to the predetermined angle; subtracting the first torque value from the second torque value to determine a net torque acting on the door; and calculating a door moment of inertia based on the net torque and the time for the door to reach the predetermined angle from the closed position.
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2. A door operator for controlling operation of a door, the door operator having a motor to open the door against a spring force, said door operator further comprising:
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a door position sensor for transmitting a signal indicative of door position; and a controller for; opening the door to a first position at a predetermined angle; measuring the current to hold the door at the predetermined angle; converting the measured current to an equivalent force of the motor acting on the spring, which represents the spring force; determining a torque value acting on the door based on the spring force; releasing the door to a second position at a predetermined angle measuring the time for the door to reach the second position at a predetermined angle calculating a door moment of inertia based on the torque applied and the time for the door to reach the second position at a predetermined angle.
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3. A door operator for controlling operation of a door, the door operator configured to operate in a manual mode wherein a user provides opening power or in a powered mode using a motor for converting electrical energy stored in a chargeable battery to open the door and to act as a braking load to control door closing speed when charging the chargeable battery in a generator mode during door closing, said operator further comprising:
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a nonvolatile door position sensor for transmitting a signal indicative of door position; and a controller for; receiving the signal from the nonvolatile door position sensor; determining the door position and a door speed; comparing the door speed to a desired door speed based on a door speed-position profile and generating a door speed error signal; minimizing the door speed error signal by adjusting the braking load resulting from charging the chargeable battery using the motor as a generator. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10)
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Specification