Integrated HVAC Motor Control for Simpler PMSM Drive Circuits
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Solution Overview
Problem
Existing HVAC control systems for household central air conditioning have complex and overlapping circuit configurations due to independent motor controllers for permanent magnet synchronous motors, leading to increased production costs and resource waste, as well as heat dissipation issues.
Innovation Solution
Integrating inverter units and rotor position detection units within the HVAC system controller or indoor/outdoor unit microprocessors to control permanent magnet synchronous motors without a dedicated motor controller, simplifying the circuit structure and reducing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If independent motor controllers are used for each permanent magnet synchronous motor, then motor control precision is improved, but device complexity increases and production cost increases
Solution Approach 1:
The patent merges the motor control functions of multiple permanent magnet synchronous motors into a single integrated controller. The controller includes multiple inverter units (first inverter unit, second inverter unit, etc.) and detection units that work together under one control system, eliminating the need for separate independent motor controllers for each motor. This integration simplifies the overall circuit configuration while maintaining precise control through coordinated operation of the merged components.
Solution Approach 2:
The integrated controller is designed with multi-functionality to control multiple different types of motors (centrifugal blower motor, compressor motor, axial fan motor) using a single device. The controller includes multiple inverter units and detection units that can handle various motor types, making the system universal rather than requiring specialized independent controllers for each motor type.
2Reliability
If independent motor controllers are used for each permanent magnet synchronous motor, then motor control precision is improved, but production cost increases
Solution Approach 1:
The patent combines multiple motor control functions into a single integrated controller, reducing the total number of controllers needed. This merging of functions decreases component count, simplifies assembly processes, and reduces production costs while maintaining the precision control capability through the coordinated operation of multiple inverter and detection units within the unified controller.
3Reliability
If independent motor controllers are used for each permanent magnet synchronous motor, then motor control precision is improved, but heat dissipation becomes more difficult
Solution Approach 1:
The patent integrates multiple inverter units and detection units into a single controller housing with a unified thermal management system. This consolidation allows for centralized heat dissipation design, where heat from multiple power electronics components can be managed through common cooling paths and thermal interfaces, improving heat dissipation efficiency compared to multiple separate controllers with individual cooling systems.
4Device complexity
If inverter units and rotor position detection units are integrated inside the HVAC system controller, then device complexity is reduced, but hardware resource utilization becomes insufficient
Solution Approach 1:
The integrated HVAC system controller is designed with multi-functional capabilities to handle various motor control tasks simultaneously. It includes multiple inverter units and detection units that can adapt to control different motor types (centrifugal blower, compressor, axial fan) with a single hardware platform, ensuring full utilization of hardware resources while maintaining simplified circuit structure.
Data Source
AI summary
An HVAC control system for a household central air conditioning, including an HVAC system controller, a centrifugal blower motor, a compressor motor, and an axial fan motor. The HVAC system controller includes an HVAC microprocessor, a sensor, an interface unit for motor control, a power supply part, and a signal processing circuit. The interface unit for motor control includes an inverter unit and a rotor position detection unit. At least one of the centrifugal blower motor, the compressor motor, and the axial fan motor is a permanent magnet synchronous motor in the absence of a motor controller. The HVAC microprocessor drives the permanent magnet synchronous motor in the absence of a motor controller via the inverter unit. The rotor position detection unit sends a rotor position signal of the permanent magnet synchronous motor in the absence of a motor controller to the HVAC microprocessor.