Variable Resistance Braking Circuit for Moving Wing Drive
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Solution Overview
Problem
Existing door actuation drives lack an operationally reliable braking system that can be adapted to the specific parameters of the connected wing, such as weight and desired closing speed, due to the limitations of conventional resistance devices like ohmic resistors and potentiometers which are susceptible to contamination and wear, and fixed resistance values.
Innovation Solution
The braking circuit incorporates a field-effect transistor with an adjustable resistance device, a voltage divider, and diodes, allowing for variable electrical resistance based on wing parameters and operating states, with a changeover device for reversing current direction and switching the resistance device on/off to decouple the braking circuit from the motor in certain states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional resistance devices (ohmic resistors and potentiometers) are used in the braking circuit, then the braking device can be implemented, but the operation reliability deteriorates due to contamination and wear
Solution Approach 1:
The patent replaces the mechanical potentiometer with an electronic field-effect transistor (FET) based resistance device. The FET's drain-source path provides the resistance function without mechanical moving parts, eliminating wear and contamination issues. The gate voltage controls the FET's resistance, providing reliable electronic adjustment of braking force.
2Adaptability or versatility
If fixed resistance values are used in the braking circuit, then the device complexity is reduced, but the adaptability to wing parameters deteriorates
Solution Approach 1:
The patent implements a dynamic resistance adjustment mechanism using a field-effect transistor where the gate voltage can be varied to change the drain-source resistance. This allows the braking force to be adapted to different wing parameters (weight, desired closing speed, current position) while maintaining a relatively simple circuit structure. The voltage divider network provides additional flexibility in setting the resistance characteristics.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables adaptive regenerative braking that can be tailored to the wing's parameters, ensuring reliable operation and effective braking control, including direction reversal and state-dependent adjustments, enhancing the reliability and adaptability of the braking system.
Implementation Method 1
The gate-source voltage of the field effect transistor depends on the size of the resistors of the voltage divider. The voltage ratio, which is dependent on the magnitudes of the resistors of the voltage divider, can be changed by a switch device, as a result of which the total electrical resistance of the braking circuit can be varied.
Implementation Method 2
The movement of the wing can be braked by a braking device, in that the electric motor can be operated as a generator. The output voltage of the electric motor operated as a generator is applied to an electrical resistance device arranged in a braking circuit.
Implementation Method 3
A voltage divider is arranged in parallel with the drain-source path of the field-effect transistor, the center tap of the voltage divider being connected to the gate connection of the field-effect transistor.
Implementation Method 4
A diode can be arranged in the braking circuit in series with the drain-source path of the field-effect transistor. This causes the braking circuit to have a high electrical resistance when the polarity of the voltage applied to it is reversed.
Data Source
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AI summary
The invention relates to a drive for actuating a moving wing, particularly a door. The output element of an electric motor is actively connected to the wing via a power transmission device so that a movement of the output element causes a movement of the wing. The movement of the wing can be braked by means of a brake device due to the fact that the electric motor can be operated as a generator. The output voltage of the generator-operated electric motor is applied to an electrical resistor device situated in a braking current circuit. The braking force of the brake device can be varied due to the fact that the electrical resistance of the resistor device can be varied.