Three-Phase Generator Signal Detection for Wing Drive Braking
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Solution Overview
Problem
Existing electromechanical drives for wings, such as doors and windows, face challenges in determining the direction and speed of rotational movement during generator operation to effectively control braking, especially in fault conditions, requiring energy-efficient and accurate methods to avoid uncontrolled impacts.
Innovation Solution
A method involving continuous measurement of electrical parameters for phase voltages in a three-phase machine, forming pairs to determine sign changes and change times, which are used to calculate the direction and speed of rotational movement, utilizing Hall sensors and comparators for efficient data processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are used to determine direction and speed of the leaf during generator operation, then measurement precision is improved, but device complexity and energy consumption increase
Solution Approach 1:
The three-phase machine itself serves as the measurement device by utilizing its own generated phase voltages to determine rotational direction and speed during generator operation, eliminating the need for external sensors
Solution Approach 2:
The three-phase machine performs dual functions: it generates electrical energy during generator operation and simultaneously provides measurement data for control purposes through its phase voltage characteristics
2Measurement precision
If Hall sensors and comparators are used for data processing, then measurement precision is improved, but use of energy increases
Solution Approach 1:
Only the essential information (sign changes of phase voltage differences) is extracted from the phase voltages, avoiding continuous processing of full voltage waveforms and reducing computational energy requirements
Solution Approach 2:
The measurement approach utilizes the periodic nature of phase voltage sign changes to determine rotational properties, processing data only at relevant transition points rather than continuously
3Measurement precision
If phase voltages are converted to actual voltage values for calculation, then measurement precision is improved, but loss of time and energy efficiency worsen
Solution Approach 1:
The patent uses simplified voltage measurements that do not require conversion to actual voltage values, accepting a simplified measurement approach that is faster and more energy-efficient for the specific purpose of determining rotational direction and speed
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 method allows for energy-efficient determination of rotational movement properties, enabling precise control of electromechanical drives during generator operation, improving safety by accurately determining direction and speed for effective braking.
Implementation Method 1
utilizing Hall sensors and comparators for efficient data processing
Implementation Method 2
a three-phase AC machine in generator operation... a three-phase current generated in generator operation by the three-phase machine
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a method for determining at least one property of the rotary motion of a three-phase AC machine in generator operation, wherein, for each of the three phases, an electrical parameter for a phase voltage (1, 2, 3) of the respective phase of the three-phase AC voltage generated by the AC machine in generator operation is continuously measured. Three pairs of electrical parameters are formed from these three parameters, such that a first pair of electrical parameters comprises the electrical parameters of a first and a second phase, a second pair of electrical parameters comprises the electrical parameters of the second phase and a third phase, and a third pair of electrical parameters comprises the electrical parameters of the third phase and the first phase. The sign of any difference between the electrical parameters of each pair of parameters is continuously determined.The rotary motion characteristic is determined from change points (t_4,1,t_4,2,t_4,3,..., t_5,1,t_5,2,t_5,3,..., t_6,1,t_6,2,t_6,3,...), wherein the change points correspond to points in time of immediately successive sign changes of the differences of the three pairs of characteristic values. The invention also relates to an electromechanical drive for actuating a wing rotatably and/or slidably mounted on a structural element, wherein the electromechanical drive has a determining device configured to carry out the method.