Brushless Motor Advance Angle Correction for Noise and Vibration
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Solution Overview
Problem
Brushless motors experience operation noise and vibration due to manufacturing errors in the relative mounting positions of sensor magnets and Hall sensors, leading to inconsistent rotation control characteristics between forward and reverse rotations.
Innovation Solution
An advance angle correction method and device that includes a stator with multi-phase coils, a rotor, a position detection sensor, and a control part that adjusts the energization timing of the coils based on advance angle correction information to minimize rotation speed differences between forward and reverse rotations, thereby reducing operation noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If standard brushless motor control is used without advance angle correction, then the motor structure remains simple and manufacturing is easy, but manufacturing errors in sensor magnet and Hall sensor mounting positions cause rotation control characteristics to differ between forward and reverse rotations, leading to increased operation noise and vibration
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing advance angle correction information in a storage part before motor operation. The control part retrieves this pre-prepared correction data based on detected rotation speed to compensate for manufacturing errors, thereby reducing operation noise and vibration without complicating the manufacturing process.
Solution Approach 2:
The patent changes the parameter of energization timing by applying advance angle correction based on rotation speed. The control part adjusts the energization timing of the coils using correction information stored in the storage part, which varies the advance angle according to rotation speed to compensate for manufacturing errors in sensor mounting positions.
2Reliability
If advance angle correction is applied to suppress operation noise and vibration, then rotation control consistency between forward and reverse rotations improves, but the device complexity increases due to additional storage part and control logic
Solution Approach 1:
The patent reduces control system complexity by using preliminary action - advance angle correction information is pre-calculated and stored in a storage part during manufacturing or setup. During operation, the control part simply retrieves this pre-prepared data based on detected rotation speed, avoiding the need for complex real-time calculations and reducing computational burden.
Solution Approach 2:
The patent replaces complex mechanical adjustment mechanisms with an electronic storage and retrieval system. Instead of physically adjusting sensor positions or using complex control algorithms, the system uses a storage part to hold correction data and a control part to retrieve and apply it, substituting mechanical complexity with simpler electronic data handling.
3Object-affected harmful factors
If rotation speed difference between forward and reverse rotations is reduced through advance angle correction, then operation noise and vibration decrease, but additional measurement and calculation steps are required
Solution Approach 1:
The patent replaces complex real-time measurement and calculation mechanisms with a storage-based approach. Instead of continuously measuring rotation speed differences and calculating correction values during operation, the system pre-calculates and stores correction information in a storage part, which is then retrieved based on detected rotation speed, significantly reducing computational complexity.
Solution Approach 2:
The patent uses copying by storing pre-calculated advance angle correction information in a storage part. The control part copies this pre-prepared correction data based on the detected rotation speed condition, avoiding the need to recalculate correction values during operation and reducing computational burden while maintaining effectiveness in suppressing operation noise and vibration.
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 effectively suppresses operation noise and vibration in brushless motors by accurately controlling the rotation angle, ensuring consistent performance in both forward and reverse directions.
Implementation Method 1
a position detection sensor that detects a rotation position of the rotor... by detecting switching of the magnetic poles of a sensor magnet that rotates with a rotor by Hall sensors
Implementation Method 2
a rotor that rotates in forward and reverse directions by a magnetic field generated by the multi-phase coils
Data Source
AI summary
An advance angle correction method of a motor device includes: acquiring first advance angle correction information indicating a correspondence relationship between an advance angle correction amount and a rotation speed difference of a rotor of the motor calculated in advance based on a rotation speed change rate; measuring the rotation speed difference of the rotor; calculating a first advance angle correction amount for each rotation direction of the rotor as a first forward rotation advance angle correction amount and a first reverse rotation advance angle correction amount so that a rotation speed difference of an output shaft becomes smaller based on the first advance angle correction information and the rotation speed difference of the rotor; and storing the calculated first forward rotation advance angle correction amount and the first reverse rotation advance angle correction amount as advance angle correction information for each motor device.