Linear Motor Door Actuator Phase Shift Control
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Solution Overview
Problem
Linear motor actuators for sliding panels face maintenance requirements, high power consumption, and inefficiencies in obstruction detection, particularly due to the need for frequent adjustments and lubrication, as well as high energy usage.
Innovation Solution
A method and controller for an electrical motor with alternating polarity magnets and conductor coils, where the motor is energized with alternating current of varying amplitude, frequency, and phase to maintain an optimum phase shift, minimizing power consumption and detecting obstructions by sensing phase shift and amplitude limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional actuators (pneumatic cylinders, ball screws, straps) are used for door actuation, then reliable door opening and closing is achieved, but maintenance requirements increase due to need for adjustments and lubrication
Solution Approach 1:
The patent replaces traditional mechanical actuation systems (ball screws, straps, pneumatic cylinders) with a linear motor system that uses electromagnetic fields to directly drive the door panel. This substitution eliminates mechanical contact components that require lubrication and adjustment, thereby reducing maintenance requirements while maintaining reliable door actuation.
Solution Approach 2:
The linear motor system incorporates self-diagnosis capabilities through sensors that detect phase shifts and obstruction conditions. The system automatically identifies and reports maintenance needs or obstructions without requiring manual inspection, enabling predictive maintenance and reducing the frequency of manual adjustments and lubrication.
2Ease of repair
If linear motor actuators are used for door actuation, then maintenance requirements are reduced, but power consumption increases
Solution Approach 1:
The linear motor operates using periodic alternating current that is synchronized with the position and velocity of the door panel. By applying electromagnetic force only when needed during the door movement cycle and using regenerative braking during deceleration, the system minimizes energy consumption while maintaining the maintenance-free operation advantage of linear motors.
Solution Approach 2:
The control system dynamically adjusts the current amplitude and phase based on real-time feedback from position and velocity sensors. This dynamic control optimizes the electromagnetic force application to match the actual door movement requirements, preventing energy waste from excessive or unnecessary motor operation while preserving the low-maintenance benefit.
3Difficulty of detecting and measuring
If sensitive edge detection is used for obstruction detection, then obstruction detection capability is achieved, but maintenance requirements increase due to need for adjustments
Solution Approach 1:
The patent replaces mechanical sensitive edge detection systems with sensor-based detection that monitors phase shift and current characteristics. This substitution eliminates the need for mechanical adjustments and lubrication of sensitive edges while maintaining effective obstruction detection capability through electrical sensing methods.
Solution Approach 2:
The system uses feedback from current sensors and phase shift measurements to detect obstructions. When an obstruction is detected through abnormal phase shift or current patterns, the system automatically adjusts operation or alerts for maintenance, eliminating the need for manual adjustment of sensitive edges while preserving obstruction detection functionality.
4Power
If high current amplitude is used in linear motor operation, then motor power and speed are improved, but power consumption increases
Solution Approach 1:
The control system dynamically adjusts current amplitude based on real-time feedback from position and velocity sensors. Current amplitude is increased only when high power is actually needed for acceleration or overcoming resistance, and reduced during constant velocity operation or deceleration. This dynamic adjustment maintains motor power when needed while minimizing energy consumption during other phases of operation.
Solution Approach 2:
The system changes operational parameters (current amplitude, frequency, phase) based on the door's position and velocity state. By optimizing these parameters for each operational phase, the system achieves high motor power when required while minimizing energy consumption during low-demand periods, effectively decoupling peak power capability from average power consumption.
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
The solution reduces power consumption and minimizes maintenance needs by optimizing the phase shift and amplitude of the motor's operation, while effectively detecting obstructions to prevent damage and improve operational efficiency.
Implementation Method 1
energizing the coils with an alternating current to produce a movement of said first and said second elements relative to one another
Data Source
AI summary
The present invention relates to an alternating current electrical motor having a first element with magnets of alternating polarities, and a second element with electrical conductor coils, the first and the second elements being mounted for relative motion to one another. A controller for the electrical motor comprising: a current source for energizing the coils with an alternating current to produce a movement of the first and the second elements relative to one another; a sensor for sensing a phase shift between the magnets and the current in the coils; and a current source controller for varying an amplitude of the current to substantially regulate the phase shift to an optimum phase shift value, thereby providing a minimum power consumption for proper operation of the electrical motor.