Brushless Motor Drive Surge Absorption Control
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Solution Overview
Problem
Conventional motor drive systems fail to effectively absorb surge energy when it occurs during motor operation, leading to voltage increases on the power supply line, especially in vehicles where power supply voltage fluctuates significantly.
Innovation Solution
A motor drive method and device that adjust the advance angle of coil energization to increase current flow when overvoltage is detected, allowing the motor to absorb energy without changing rotational speed, thereby preventing voltage increases on the power supply line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the blower motor is energized to absorb surge energy when surge is generated while the motor is stopped, then the surge energy can be absorbed, but the motor cannot absorb surge energy when it is already energized and driven
Solution Approach 1:
The patent applies dynamics by making the advance angle amount adjustable based on operating conditions. The control device dynamically changes the advance angle amount from a first value (when motor is stopped) to a second value (when motor is driven) to enable surge absorption in both states. This dynamic adjustment allows the motor to adapt its surge absorption capability according to its current operational state, resolving the contradiction between reliability and adaptability.
2Reliability
If the current amount is increased to absorb overvoltage energy, then the overvoltage energy can be absorbed, but the noise and power consumption increase
Solution Approach 1:
The patent applies parameter changes by adjusting the advance angle amount based on power supply voltage conditions. When overvoltage is detected, the control device increases the advance angle amount to absorb the excess energy. When voltage is normal, it reduces the advance angle amount to minimize noise and power consumption. This parameter adjustment strategy enables the system to achieve overvoltage protection while minimizing harmful effects during normal operation.
3Reliability
If the advance angle amount is increased to increase current flow for absorbing overvoltage, then the overvoltage energy can be absorbed, but the motor rotational operation may be affected
Solution Approach 1:
The patent applies local quality by making different parts of the control strategy serve different functions. The advance angle amount is selectively adjusted based on the motor's operational state (stopped or driven) and voltage conditions. When the motor is driven, the control device adjusts the advance angle to absorb overvoltage while maintaining rotational stability through coordinated control, ensuring that the local adjustment does not disrupt the overall rotational operation.
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 method and device ensure stable power supply operations by absorbing overvoltage energy, maintaining rotational speed, and reducing noise, even during fluctuations in power supply voltage.
Implementation Method 1
a coil and a rotor rotatably disposed and confronting the stator, the coil is energized and driven at energizing timing of which phase is determined based on an advance angle amount to rotate the rotor
Data Source
AI summary
A method for driving a motor including a stator wound with a coil and a rotor rotatably disposed and confronting the stator, whereby the coil is energized and driven at energizing timing of which phase is determined based on an advance angle amount to rotate the rotor. At this time, it is determined whether or not a power supply voltage supplied to the motor exceeds a predetermined voltage, and when it is determined that the power supply voltage exceeds the predetermined voltage, the advance angle amount is changed to increase a current amount flowing through the coil, for energizing and driving the coil.