Motor Drive Control Device for Single Phase Motor
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Solution Overview
Problem
Motor drive control devices face challenges in maintaining positive rotation of single-phase motors when one of the driving circuits fails, leading to potential reverse rotation and reduced cooling efficiency in applications like fan motors, which can cause internal pressure drops and deteriorate the cooling function.
Innovation Solution
A motor drive control device with two driving circuits and a control unit that detects voltage and rotation to execute maintenance operations, ensuring continued positive rotation by compensating with the operational circuit and stopping the faulty one, and outputs specific signals to indicate the operation mode to the host apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single driving circuit is used to control the motor, then the device complexity is reduced, but the reliability deteriorates because the motor cannot maintain positive rotation when the driving circuit fails
Solution Approach 1:
The driving circuit is divided into two independent driving circuits (first and second driving circuits), each capable of independently controlling the motor to rotate in the positive direction. This segmentation allows the system to maintain reliability by switching to the other circuit if one fails, while keeping each circuit relatively simple in structure.
2Productivity
If both driving circuits operate simultaneously, then the productivity is improved by ensuring continuous motor operation, but the loss of energy increases due to redundant circuit operation
Solution Approach 1:
The control unit dynamically switches between the first and second driving circuits based on their operational status. When one circuit is detected to be abnormal, the control unit automatically switches to the other circuit to maintain motor operation. This dynamic switching ensures continuous productivity while avoiding energy waste from operating both circuits simultaneously when only one is needed.
3Reliability
If the control unit continuously monitors both driving circuits, then the reliability is improved by detecting failures early, but the use of energy increases due to continuous monitoring operations
Solution Approach 1:
The control unit implements a feedback mechanism by detecting the operational status of each driving circuit and automatically switching between them based on detected abnormalities. The control unit monitors whether the motor is rotating in the positive direction and switches circuits accordingly, providing reliable failure detection while managing energy consumption through intelligent, event-driven monitoring rather than continuous 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 solution effectively maintains positive rotation of the motor as long as possible, preventing reverse rotation and ensuring continued operation even when one driving circuit fails, thus maintaining the cooling function and preventing pressure differences.
Implementation Method 1
a driving voltage detecting unit configured to detect a driving voltage applied to the first driving circuit and a driving voltage applied to the second driving circuit
Implementation Method 2
a single phase motor including a coil of a first system and a coil of a second system
Data Source
AI summary
A motor drive control device causes a single phase motor including a coil of a first system and a coil of a second system to be driven. The motor drive control device has a first driving circuit configured to perform control to energize the coil of the first system, a second driving circuit configured to perform control to energize the coil of the second system, and a driving control unit configured to control an operation of the first driving circuit and an operation of the second driving circuit. The driving control unit has a driving voltage detecting unit configured to detect a driving voltage applied to the first driving circuit and a driving voltage applied to the second driving circuit, and a compensation control unit configured to cause one driving circuit between the first driving circuit and the second driving circuit to execute a maintenance operation for maintaining rotation of the single phase motor, based on a detection result of the driving voltage detecting unit.