Motor Coil Switching With Bus Voltage Control for Air Conditioners
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Solution Overview
Problem
Existing motor driving technologies for air conditioners face inefficiencies when switching between Y connection and delta connection, as they fail to sufficiently enhance motor efficiency, particularly at varying rotation speeds.
Innovation Solution
A driving device that includes a converter to generate a bus voltage, an inverter to convert the bus voltage to AC, and a connection switching unit to switch the coil connection state, with the bus voltage adjusted according to the coil connection state to optimize motor efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the connection state of coils is switched between Y connection and delta connection to enhance operation efficiency, then motor efficiency is improved, but it is difficult to sufficiently enhance efficiency simply by switching connection states
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the bus voltage level in conjunction with coil connection state switching. The controller switches between first bus voltage and second bus voltage levels depending on the operational mode (Y connection or delta connection), thereby optimizing motor efficiency across different operating conditions without excessive complexity
Solution Approach 2:
The patent implements dynamics by making the bus voltage adjustable and switchable based on real-time operational requirements. The controller dynamically changes the bus voltage level according to the coil connection state, enabling the system to adapt to varying load conditions and rotation speeds, thus sufficiently enhancing motor efficiency beyond static connection switching
2Use of energy by moving object
If bus voltage is switched in accordance with coil connection state, then motor efficiency is sufficiently enhanced, but device complexity increases due to additional voltage switching control
Solution Approach 1:
The controller serves multiple functions: it manages coil connection state switching, adjusts bus voltage levels, and coordinates inverter operation. By integrating these functions into a single control unit, the patent achieves sufficient motor efficiency enhancement without proportionally increasing overall device complexity
Solution Approach 2:
The patent changes the bus voltage parameter dynamically based on the coil connection state. The controller switches between different bus voltage levels (first and second voltages) to match the operational requirements of Y connection or delta connection modes, thereby optimizing efficiency while maintaining manageable control complexity through systematic parameter management
3Device complexity
If only connection state switching is performed without bus voltage adjustment, then device complexity remains low, but motor efficiency cannot be sufficiently enhanced
Solution Approach 1:
The patent introduces bus voltage as an additional adjustable parameter alongside connection state switching. By modifying the bus voltage level according to operational mode (Y or delta connection), the system achieves sufficient motor efficiency enhancement while keeping the control system relatively simple through coordinated parameter management
Solution Approach 2:
The system implements dynamic adjustment of bus voltage in response to changing operational conditions and coil connection states. This dynamic control enables the motor to operate efficiently across various load conditions and rotation speeds, achieving sufficient efficiency enhancement without requiring overly complex control mechanisms
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 enhances motor efficiency by dynamically adjusting the bus voltage based on the coil connection state, improving performance across different rotation speeds and load conditions.
Implementation Method 1
a converter to generate a bus voltage
Implementation Method 2
an inverter to convert the bus voltage to an AC voltage and supply the AC voltage to the coils
Implementation Method 3
a motor having coils
Data Source
AI summary
A driving device drives a motor having coils. The driving device includes a converter to generate a bus voltage, an inverter to convert the bus voltage to an AC voltage and supply the AC voltage to the coils, and a connection switching unit to switch a connection state of the coils. The bus voltage generated by the converter is switched in accordance with the connection state of the coils.