Motor Driving Apparatus Sensor Merging for Precision Control
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Solution Overview
Problem
Conventional motor driving apparatuses require multiple sensors for complex motor control, leading to increased costs and complexity, particularly in optical apparatuses where precise control is needed, and there is a need to unify the functions of motor and drive object detecting sensors to achieve better controllability and miniaturization.
Innovation Solution
A motor driving apparatus with a rotor magnetized in multiple poles and a position detecting unit using four magnetic sensors to detect magnet poles, allowing the motor to be controlled based on signals from these sensors, thereby eliminating the need for separate drive object detecting sensors and simplifying sensor arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors are arranged at complicated angles to detect magnet poles for precise motor control, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines the functions of multiple sensors into a unified sensor system that detects magnet pole positions. By integrating the detection capabilities into a single coordinated system rather than using separate sensors at complicated angles, the patent reduces device complexity while maintaining measurement precision for motor control.
Solution Approach 2:
The sensor system is designed to perform multiple functions: detecting magnet pole positions, determining rotor orientation, and providing feedback for motor control. This multi-functional approach eliminates the need for separate specialized sensors, thereby reducing overall device complexity while preserving measurement accuracy.
2Measurement precision
If two separate sensors (motor detecting sensor and drive object detecting sensor) are provided for feedback control, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the motor detecting sensor and drive object detecting sensor into a single integrated sensor system. This unified sensor performs both detection functions simultaneously, reducing the total number of sensors required while maintaining the precision needed for feedback control of both motor speed and drive object position.
Solution Approach 2:
The integrated sensor system is designed with multi-functionality to serve dual purposes: monitoring motor operation and tracking drive object position. This eliminates the need for separate specialized sensors, thereby reducing device complexity while preserving measurement precision for both control loops.
3Measurement precision
If conventional sensor arrangement with complicated angles is used, then measurement precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent combines multiple sensing functions into a single sensor arrangement that does not require complicated angular positioning. By integrating detection capabilities, the system achieves precise magnet pole detection without the manufacturing complexity of precisely angle-multiple separate sensors, thereby improving ease of manufacture.
Solution Approach 2:
The patent changes the detection parameters and sensing approach to achieve accurate magnet pole detection without requiring sensors to be positioned at complicated angles. This parameter change simplifies the manufacturing process while maintaining measurement precision.
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 provides excellent controllability of the motor at a lower cost by integrating sensor functions and reducing the complexity of sensor arrangements, enabling precise control of motor speed and position without the need for multiple sensors.
Implementation Method 1
a position detecting unit having a first detecting element, a second detecting element, a third detecting element and a fourth detecting element, each of which detects a magnet pole
Data Source
AI summary
A motor driving apparatus comprises a motor including a rotor that is rotatable and has a magnet whose outer peripheral surface divided in a circumferential direction is magnetized in multiple poles with alternating different polarities, and a position detecting unit having a first detecting element, a second detecting element, a third detecting element and a fourth detecting element, each of which detects a magnet pole, a driving unit that drives the motor on the basis of signals output from the first to fourth detecting elements, and a controlling unit that obtains a rotational quantity of the motor on the basis of signals output from the first and second detecting elements and that outputs a control signal of the motor to the driving unit on the basis of the rotational quantity of the motor.