Single Coil BLDC Motor Driver with Adjustable Electrical Lead Angle
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Solution Overview
Problem
Single coil motors face challenges in efficiently operating in both clockwise and counterclockwise rotation directions due to asymmetrical stator shoe poles, leading to difficulties in starting and increased noise levels when designed for energy efficiency in one preferred direction.
Innovation Solution
A motor driver system that generates a driving signal with a defined electrical lead angle, adjustable based on rotation direction, using a combination of magnetic sensor data and timing information to optimize motor operation in both directions, reducing peak currents and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the motor is designed to run in one preferred direction for energy efficiency, then energy efficiency is improved in that direction, but energy efficiency deteriorates in the opposite rotation direction and noise level increases
Solution Approach 1:
The patent applies dynamics by making the electrical lead angle adjustable based on rotation direction. The control system dynamically switches between different lead angle values (first lead angle for CW, second lead angle for CCW) to optimize motor performance in both directions, transforming a static design into an adaptive one that responds to operational conditions
Solution Approach 2:
The patent changes the electrical lead angle parameter depending on rotation direction. By defining different lead angle values for clockwise and counter-clockwise operation, the system optimizes energy efficiency and noise levels in both directions, resolving the contradiction between single-direction optimization and bidirectional adaptability
2Stability of the object's composition
If the motor is halted in the zero torque position, then the motor structure is stable, but it becomes difficult to start the motor or it starts randomly in either direction
Solution Approach 1:
The patent applies preliminary action by pre-defining different electrical lead angles for clockwise and counter-clockwise directions. Before starting the motor, the control system selects the appropriate lead angle based on the desired rotation direction, ensuring the motor has the correct electrical configuration in advance to overcome the zero torque position reliably and prevent random starting
Solution Approach 2:
The patent uses feedback by detecting the actual rotation direction of the motor and adjusting the electrical lead angle accordingly. The control system monitors whether the motor is rotating clockwise or counter-clockwise and switches between the first and second lead angles to maintain optimal performance and reliable starting in both directions
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 efficient and quiet operation of single coil motors in both clockwise and counterclockwise directions by adjusting the electrical lead angle, ensuring positive total lead angles regardless of rotation direction, thus optimizing motor performance and reducing noise.
Implementation Method 1
A motor driver (100) for driving a rotor (211) of a single coil motor (210) in a clockwise or counterclockwise rotation direction with respect to a stator (212) of the single coil motor (210)... generating a driving signal which has an electrical lead angle
Implementation Method 2
The position signal may be obtained by using a magnetic sensor, such as a hall effect sensor, to determine the transition of magnetic poles on the rotor
Data Source
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Figure 3A~4
Figure 5
AI summary
A motor driver 100 for driving a rotor 211 of a single coil motor 210 in a clockwise or counterclockwise rotation direction with respect to a stator 212 of the single coil motor 210. The motor driver 100 is adapted for generating a position signal which is representative for the angular position of the rotor 211 with respect to the stator 212, and comprises a controller 120 which comprises a direction input 150 to define the rotation direction of the rotor 211, and which is adapted for generating a driving signal for rotating the rotor in the defined rotation direction, wherein the driving signal is based on the position signal and is based on a signal which is indicative for an electrical lead angle wherein the signal indicative for the electrical lead angle is set such that the total lead angle is positive in both rotation directions of the rotor.