Single Phase Motor Driving Circuit Dynamic Cut-off Angle Adjustment
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Solution Overview
Problem
Conventional motor driving circuits for single phase motors face inefficiencies and high power consumption due to fixed cut-off angles, leading to suboptimal performance and reverse current generation at commutation points.
Innovation Solution
A motor driving circuit and method that includes a Hall sensor, commutation detection circuit, period recording circuit, motor current detection circuit, cut-off angle adjustment circuit, and control circuit to dynamically adjust the cut-off angle based on motor current values at commutation points, ensuring the motor current approaches zero, thereby optimizing efficiency and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed cut-off angle is used in the motor driving circuit, then the circuit structure is simple, but the motor efficiency is low and power consumption is high due to reverse current generation at commutation points
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed cut-off angle to a dynamic adjustable cut-off angle. The cut-off angle adjustment circuit dynamically modifies the cut-off angle based on detected motor current values at commutation points, allowing the system to adapt to varying operating conditions and eliminate reverse current losses without excessive complexity
Solution Approach 2:
The patent implements parameter changes by adjusting the cut-off angle parameter based on motor current detection. The cut-off angle adjustment circuit modifies this critical timing parameter in response to detected current values, optimizing the commutation timing to prevent reverse current generation and reduce energy losses
2Device complexity
If a fixed cut-off angle is used in the motor driving circuit, then the circuit structure is simple, but the motor efficiency is low due to suboptimal performance at commutation points
Solution Approach 1:
The patent implements feedback by using the motor current detection circuit to monitor current values at commutation points and feeding this information back to the cut-off angle adjustment circuit. This closed-loop feedback mechanism enables real-time optimization of the cut-off angle to maintain peak motor efficiency under varying load conditions
Solution Approach 2:
The system transitions from static to dynamic operation by continuously adjusting the cut-off angle based on real-time motor current measurements, enabling the motor to operate at optimal efficiency points across different operating conditions rather than being constrained by a fixed angle
3Loss of energy
If the cut-off angle is dynamically adjusted based on motor current values, then power consumption is reduced and efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the control function into distinct modular components: motor current detection circuit, cut-off angle adjustment circuit, and control circuit. This modular segmentation allows each component to perform its specific function independently, managing overall system complexity through functional decomposition
4Productivity
If the cut-off angle is dynamically adjusted based on motor current values, then motor efficiency is optimized and reverse current is minimized, but the device complexity increases
Solution Approach 1:
The control system is segmented into specialized functional modules: detection circuit for monitoring current, adjustment circuit for modifying the cut-off angle, and control circuit for coordinate switching control. This segmentation enables optimized motor efficiency through coordinated operation of independent functional blocks
Solution Approach 2:
The patent implements multi-functionality by integrating detection, adjustment, and control functions within a unified driving circuit system. The same circuit architecture handles both commutation control and cut-off angle optimization, reducing the need for separate dedicated circuits and managing complexity through functional integration
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 adaptive cut-off angle adjustment enables the motor to operate at a best efficiency point, minimizing reverse current generation and reducing power consumption, thereby enhancing efficiency and performance.
Implementation Method 1
The Hall sensor is configured to sense a magnitude of a magnetic field of a rotor of the single phase motor, and correspondingly generate a Hall signal group
Data Source
AI summary
A motor driving circuit for a single phase motor and a motor driving method for the same are provided. The motor driving circuit includes a motor driver, a Hall sensor, a Hall commutation detection circuit, a period recording circuit, a motor current detection circuit, a cut-off angle adjustment circuit, an angle calculation circuit and a control circuit. The motor current detection circuit detects a motor current value at a commutation point after the single phase motor operates normally. The cut-off angle adjustment circuit generates a cut-off angle adjustment signal indicating a cut-off adjustment angle according to the motor current value when the single phase motor passes the commutation point. The control circuit processes the commutation signal and the cut-off signal generated by the angle calculation circuit to generate a control signal group to control the motor driver to generate an output signal group to drive the motor.