Rotor Alignment Sensing for Accurate Stator Tooth Activation
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Solution Overview
Problem
Existing electric motor systems face challenges in accurately determining rotor alignment and speed without relying on expensive and complex sensors, leading to potential errors in stator tooth activation that can impede rotor rotation or damage supporting circuitry.
Innovation Solution
Implementing a sensorless alignment sensing mechanism using existing motor components, such as coil windings, to estimate rotor alignment and speed, combined with error detection and correction processes that utilize minimal processing and memory resources, including the use of timestamps and counters to manage stator tooth activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sophisticated rotor speed and position detection processes are implemented, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The motor's own coil windings are utilized as sensing elements to detect rotor position and speed, eliminating the need for separate expensive sensors. The system serves itself by using existing components for dual purposes: motor operation and position sensing
Solution Approach 2:
The coil windings perform multiple functions: they generate electromagnetic fields for motor operation and simultaneously serve as sensing elements for detecting rotor position and speed through inductance measurements, reducing overall system complexity
2Reliability
If error detection and correction processes are implemented, then reliability is improved, but device complexity increases
Solution Approach 1:
The system continuously monitors rotor position and speed through inductance measurements and uses this feedback to detect errors in stator tooth activation timing, applying corrections based on detected deviations from expected operation
Solution Approach 2:
The error detection implementation uses selective monitoring of critical parameters (inductance changes, timing deviations) rather than comprehensive system monitoring, achieving sufficient reliability with minimal processing overhead
3Device complexity
If sensorless alignment sensing mechanism is used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent replaces physical sensors with an electrical sensing mechanism that uses inductance measurements from coil windings to determine rotor position, substituting mechanical/electromechanical sensing with electrical field-based sensing
Solution Approach 2:
The inductance measurements serve as an intermediary parameter that indirectly indicates rotor position and alignment, allowing the system to derive position information without direct physical contact or optical sensors
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
Enables accurate rotor alignment and speed estimation with reduced costs and complexity, minimizing errors in stator tooth activation and preventing damage to motor components.
Implementation Method 1
Electromagnetic fields may be formed, such as on a portion of a stator, and the resulting force interaction between a portion of a rotor and the formed electromagnetic field may provide a torque on the rotor
Implementation Method 2
Implementing a sensorless alignment sensing mechanism using existing motor components, such as coil windings, to estimate rotor alignment and speed
Data Source
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AI summary
The present techniques generally relate to electric motor which may include one or more sensors usable to determine rotor alignment and/or speed. A method and apparatus for rotor alignment and/or speed error detection and/or correction are proposed, such as using signals from one or more sensors. A method and apparatus for controlling stator tooth activation based, at least in part, on corrections and offsets is also disclosed.