Amid the wave of smart homes, modern washing machines are transitioning from mechanical control to digital intelligent control, placing stringent demands on the main control chip's real-time performance, energy efficiency, and reliability. Artery Technology’s AT32F413 series high-performance MCU, leveraging a 150MHz Cortex-M4 core, sensorless FOC algorithm, and highly integrated peripherals, provides a full-stack solution for direct-drive motor control, multi-functional interaction, and safety protection, leading the evolution of washing machines towards quieter, more energy-efficient, and intelligent operation.
I. Precision Control of Direct-Drive Motors: Addressing Three Industry Pain Points
1. Sensorless FOC Enables Ultra-Quiet Operation
Traditional belt-drive motors suffer from high vibration and noise. The AT32F413 incorporates a sensorless Field-Oriented Control (FOC) vector algorithm. Using a Luenberger observer to track rotor position in real-time and a 2Msps high-speed ADC for current sampling, it achieves precise motor torque control.
→ Result:Motor vibration is reduced by 40%, and operational noise is ≤45dB (below the Chinese national standard upper limit of 55dB), rivaling the quiet performance of high-end imported models.
2. Wide Speed Range Adapts to Load Fluctuations
To handle sudden load changes during washing/dewatering cycles (e.g., uneven laundry distribution), the chip features a built-in adaptive PID regulator that dynamically adjusts PWM duty cycles:
• Washing Mode:Smooth speed transition between 30-120rpm prevents clothes from tangling.
• Dewatering Mode:Rapid acceleration from 0-1600rpm (acceleration time ≤15 seconds).
→ Result:Dewatering efficiency increases by 25%, with industry-leading capability to suppress eccentric vibrations.
3. Dual-Resistor Sampling Reduces Costs and Boosts Efficiency
An innovative configurable single/dual-resistor sampling architecture is employed:
• Economy Models:Single-resistor scheme saves costs by eliminating 3 operational amplifier circuits.
• High-End Models:Dual-resistor scheme enhances current loop accuracy to ±1%.
→ Result:BOM cost is reduced by 15%, supporting differentiated product strategies.
II. Intelligent Interaction and System Reliability Design
1. Multi-Protocol Human-Machine Interface (HMI)
• 12-bit Capacitive Touch: Supports operation with gloves or wet hands, with a mis-touch rate <0.1%.
• Dual CAN Bus: Interconnects frequency conversion modules and smart dispensing systems, enabling detergent level warnings.
• USB OTG: Facilitates firmware updates via USB drive, improving after-sales maintenance efficiency by 70%.
2. End-to-End Safety Protection
Protection Mechanism | Technical Implementation | User Value |
Stall Protection | Real-time monitoring of phase-current surges; output shut-down within 3 ms | Prevents motor burn-out |
Over-Temperature Protection | Dual-redundant detection: on-chip temperature sensor + external thermocouple | Eliminates high-temperature fire risk |
Power-Surge Immunity | Integrated VDD under-voltage lockout (UVLO), withstands ±2 kV ESD strikes | Extends overall appliance lifetime |
III. Typical Application Scenarios and Solution Advantages
1. Variable Frequency Direct-Drive Drum Washing Machine
• Utilizes AT32F413RCT7 (128KB Flash).
• Achieves stepless speed control with washing speed accuracy of ±1rpm.
• Supports smart dispensing by linking with load sensors via CAN bus, error ≤ ±1ml.
2. IoT-Enabled Smart Pulsator Washing Machine
• Utilizes AT32F403ACGU7 (with integrated PHY).
• Supports Wi-Fi/Bluetooth dual-mode connectivity, OTA upgrade success rate reaches 99.9%.
• Cloud integration enables energy consumption visualization, generating monthly electricity reports.
The Artery AT32 series MCU, combining a high-performance 150MHz core with dedicated motor peripherals, breaks through the limitations of traditional washing machines in energy efficiency, noise, and intelligence. Its solutions have been adopted in high-end models from leading brands like Haier and Little Swan, with measured energy efficiency meeting China's Grade I standard (≤0.12 kWh/cycle). As trends like AI-based laundry recognition and carbon neutrality evolve, Artery will continue to drive the home appliance industry toward greener and smarter futures through chip-level innovation.
About Mandu Technology
Shenzhen Mandu Technology Co., Ltd. has steadfastly centered its operations on the distribution of high-performance, high-quality, and highly reliable integrated circuit products. Its portfolio encompasses memory chips, differential crystal oscillators, and MCU microcontrollers, while progressively integrating analog signal chain products. The company prides itself on delivering comprehensive and cost-effective solutions to its customers. Its products find applications across a broad spectrum of industries, including but not limited to network communication, industrial control, robotics, medical equipment, personal health, and numerous other fields.
Business: sales@manduic.com
Website: www.manduic.com
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Mailbox: sales@manduic.com
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