Motor Coil Energization Timing Control for Vibration Reduction
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Solution Overview
Problem
Conventional motor drive control devices experience vibration due to constant interval switching of energization to coils, which is not effectively mitigated by existing techniques.
Innovation Solution
A motor control device with a rotation speed calculation unit, energization stop time period calculation unit, and energization signal generation unit that calculates and implements an energization stop time period to disperse the timing of energization switching, reducing vibration by controlling the energization signal for each coil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If overlap energization is performed with constant interval switching, then energization control is simplified, but vibration occurs during switching
Solution Approach 1:
The patent applies dynamics by making the energization stop time period variable rather than constant. The control device calculates and adjusts the stop time period based on motor rotation speed, transforming a static control method into a dynamic one that adapts to operating conditions to reduce vibration while maintaining control simplicity
Solution Approach 2:
The patent changes the parameter of energization stop time period from a fixed constant value to a variable value calculated based on motor rotation speed. This parameter change allows the system to optimize vibration reduction across different operating speeds while keeping the control structure relatively simple
2Ease of operation
If energization switching is performed at constant intervals, then control timing is simplified, but vibration is not effectively reduced
Solution Approach 1:
The patent modifies the timing parameter by making the energization stop time period variable based on rotation speed. This allows the control system to maintain ease of operation through automated calculation while effectively reducing vibration by adapting timing to actual motor conditions
3Object-affected harmful factors
If variable energization stop time period is calculated based on rotation speed, then vibration is reduced, but control calculation complexity increases
Solution Approach 1:
The patent implements feedback by using the calculated motor rotation speed to determine the energization stop time period. This feedback mechanism allows the system to automatically adjust timing parameters based on actual operating conditions, achieving vibration reduction without requiring complex external control systems
Solution Approach 2:
The control device performs self-service by calculating its own control parameters (energization stop time period) based on its operating state (rotation speed). This self-adjustment capability reduces vibration while minimizing the need for additional external control complexity
Data Source
AI summary
A drive control device includes a rotation speed calculation unit configured to calculate a rotation speed of a motor based on a rotation position detection signal of the motor, an energization stop time period calculation unit configured to calculate an energization stop time period for stopping energization to all phases of coils of the motor based on a target rotation speed and the rotation speed of the motor, and an energization signal generation unit configured to generate an energization signal for controlling energization to the coils of the motor to switch energization to the coils of the motor and to stop energization to all the coils of the motor in the energization stop time period.