Variable Delay Motor Control for Efficiency Across Speeds
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Solution Overview
Problem
Conventional motor control systems with fixed delay times fail to maintain high efficiency across multiple rotation speeds and varying operating conditions such as temperature and voltage.
Innovation Solution
A variable-delay-time control system comprising a control unit, driving unit, and motor, where the control unit outputs control signals with adjustable delay times based on predetermined signals like PWM, temperature, or voltage, allowing the driving unit to generate driving signals that optimize motor conduction time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed delay time is used for control signals, then the motor can operate at high efficiency at a specific rotation speed, but the motor cannot operate at high efficiency at multiple rotation speeds
Solution Approach 1:
The patent implements a variable delay time counter that dynamically adjusts the delay time based on the detected rotation speed of the motor. The counter resets at different time points corresponding to different rotation speeds, enabling the control system to adaptively optimize the delay time for each operating condition, thereby resolving the contradiction between maintaining high efficiency at specific speeds and adapting to multiple rotation speeds.
2Productivity
If a fixed delay time is used for control signals, then the control system is simple, but the motor cannot operate at high efficiency in different operating states such as varying temperatures or voltages
Solution Approach 1:
The patent employs a self-adjusting mechanism where the variable delay time counter automatically detects the motor's operating state (through rotation speed detection) and self-adjusts the delay time without requiring external intervention or complex control algorithms. This self-service approach enables the system to adapt to different operating states while maintaining relatively simple control circuitry.
3Productivity
If the sensing element is disposed at a fixed position, then the motor can operate at high efficiency at a fixed rotation speed, but the sensing element cannot enable the motor to operate at high efficiency at all rotation speeds
Solution Approach 1:
The patent changes the temporal parameter (delay time) of the control system based on the motor's rotation speed. By varying the delay time parameter according to the detected rotation speed, the system optimizes the commutation timing for different operating conditions, enabling high efficiency across a wide rotation speed range while keeping the sensing element at a fixed position.
Data Source
AI summary
A variable-delay-time control system for a motor is provided. The system includes a control unit, a driving unit, and a motor. The control unit is used to output at least one control signal according to at least one predetermined signal, and the control signal has a variable delay time. The driving unit is connected to the control unit, and is used to receive the control signal and generate a driving signal. The motor is connected to the driving unit, and conduction time of the motor is controlled according to the driving signal and the variable delay time. With the variable-delay-time control system of the present invention, the delay time of the control signal is variable, so the motor can operate at a high efficiency (for example, at a reduced current). Moreover, as the variable-delay time can be adjusted according to the predetermined signal, the motor can operate at a high efficiency in different operating states, thus improving the overall efficiency of the motor.