Novel PWM control method for ECM motor
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Solution Overview
Problem
Existing ECM motors require multiple models to accommodate different air conditioning load parameters, leading to complex identification processes and increased development cycles and costs.
Innovation Solution
A novel PWM control method for ECM motors that utilizes a microprocessor to detect the frequency and duty cycle of an input PWM signal, selecting corresponding motor application parameters and calculating target operating values such as torque or airflow, enabling compatibility with various load models.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple ECM motor models are used to accommodate different air conditioning load parameters, then compatibility with various load models is improved, but device complexity and development costs increase
Solution Approach 1:
The patent implements a universal ECM motor model that can adapt to multiple air conditioning load models through software-based parameter identification. The motor controller automatically detects load parameters and adjusts control strategies, enabling one motor model to serve multiple applications that previously required different specialized models.
Solution Approach 2:
The patent changes the approach from hardware/model diversity to parameter flexibility. By identifying and adapting to different load parameters (torque, airflow, pressure, temperature) through software algorithms, the system achieves compatibility across various load models without requiring multiple physical motor models.
2Adaptability or versatility
If multiple ECM motor models are developed for different load models, then adaptability to various air conditioning loads is improved, but development time and cost increase
Solution Approach 1:
The patent creates a single universal motor model with integrated load identification capabilities that can handle multiple air conditioning load types. This eliminates the need for separate development cycles for each load model, as the unified system automatically adapts to different loads through parameter detection and adjustment.
Solution Approach 2:
The motor controller performs automatic load parameter identification and self-adjustment without requiring manual configuration or separate development processes for each load model. The system serves itself by detecting load characteristics and optimizing control parameters in real-time, reducing development and configuration time.
Data Source
AI summary
A novel PWM control method is provided for an ECM motor. The ECM motor includes a motor controller and a motor unit. A microprocessor, an inverter circuit, and an interface circuit are provided on a motor control circuit board. The motor control circuit board is provided with a PWM input port, by means of which a PWM control signal from an external device is processed through the interface circuit and then input into the microprocessor. A plurality of sets of motor application parameters are stored in the motor controller, and the microprocessor detects a frequency of the input PWM signal, selects a corresponding set of motor application parameters based on the frequency of the input PWM signal, detects a duty cycle of the input PWM signal, and calculates a target operating value required for the motor based on the selected set of motor application parameters and the duty cycle. The method enables the ECM motor to be compatible with a variety of air conditioning load models, thereby significantly reducing motor part numbers and bringing great convenience to customers.