Electrically commutated motor and freezer comprising the same
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Solution Overview
Problem
Existing electrically commutated motor (ECM) systems in freezers require complex and costly motor controllers for rotational speed regulation, making them difficult to install and maintain.
Innovation Solution
An ECM motor with a simplified structure and reduced components that uses two temperature detecting units to automatically regulate rotational speed, eliminating the need for a specialized controller by connecting a microprocessor to IGBT modules and thermocouple temperature sensors to select between two operational speeds based on temperature differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a specialized motor controller is used to control ECM motor rotational speed, then the motor can operate at different speeds, but the device complexity and cost increase
Solution Approach 1:
The patent integrates the temperature detection function and motor control function into a single integrated control unit. The microprocessor directly receives temperature signals from thermocouples and controls the IGBT module, eliminating the need for separate specialized controllers. This merging approach maintains rotational speed adaptability while significantly reducing device complexity and component count.
Solution Approach 2:
The integrated control unit performs multiple functions: it detects temperature via thermocouples, processes temperature signals, controls IGBT switching, and regulates motor speed. This multi-functional design allows a single component to replace what would traditionally require multiple specialized devices, reducing overall system complexity while maintaining full speed control capability.
2Adaptability or versatility
If a specialized motor controller is used to control ECM motor rotational speed, then the motor can operate at different speeds, but the installation complexity increases
Solution Approach 1:
By combining temperature detection and motor control into one integrated unit with direct connections to thermocouples and IGBT modules, the patent reduces the number of installation steps and connection points. The microprocessor-based control unit requires fewer external components and connections compared to traditional specialized controllers, making installation simpler and more convenient.
3Reliability
If traditional ECM motor control is used, then reliable speed control is achieved, but production cost increases
Solution Approach 1:
The patent employs a cost-effective integrated control unit using standard microprocessor technology and common electronic components like IGBT modules and thermocouples. This approach replaces expensive specialized motor controllers with more affordable, widely-available components that achieve the same functional reliability, thereby reducing production costs while maintaining dependable speed control.
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 provides a cost-effective, easy-to-install ECM motor that accurately adjusts rotational speed, reducing production costs and installation complexity while ensuring reliable operation in freezers.
Implementation Method 1
a first temperature detecting unit and a second temperature detecting unit are respectively disposed at different positions outside the ECM motor for detecting a first temperature T1 and a second temperature T2 of different positions
Implementation Method 2
An output terminal of the microprocessor is connected to an input terminal of the IGBT module, and an output terminal of the IGBT module is connected to the coil windings wound on the stator core
Implementation Method 3
The stator assembly comprises a stator core and coil windings wound on the stator core. The rotor assembly comprises a rotor core and permanent magnets embedded in the rotor core
Data Source
AI summary
An ECM motor, including: a motor controller and a motor body. A microprocessor of the motor controller is connected to a first temperature detecting unit and a second temperature detecting unit disposed at different positions outside the ECM motor for detecting temperatures at the different positions. In operation, when the temperature difference between the first temperature T1 and the second temperature T2 is smaller than or equal to a preset value T0, a first gear at the rotational speed S1 is selected by the microprocessor and the motor is controlled to run constantly in the first gear at the rotational speed S1. When the temperature difference between the first temperature T1 and the second temperature T2 is larger than the preset value T0, a second rotational speed S2 is selected by the microprocessor and the motor is controlled to run constantly in the second gear at the rotational speed S2.