As the wireless lithium-power tool and home cleaning appliance industries are developing rapidly, end-product demands for motor performance — including high torque, ultra-high speed, low vibration and noise, and long-term reliability — continue to intensify.

Fortior (A-share: 688279.SH; H-share: 01304.HK) has independently developed MCU series FU6561N/T and FU6565N/T for BLDC motor applications. Powered by a proprietary motor control core, this chip family covers the four mainstream segments of lithium power tools, handheld vacuum cleaners, high-power high-speed hair dryers, and robot vacuum cleaners.

Featuring sensorless drive architecture with single-shunt current sampling and pre-integrated, mature algorithms, the series delivers high performance, simplified debugging, and superior system reliability, providing a comprehensive one-stop solution for the operational challenges of low-voltage brushless motors.

1. FU6561/FU6565 Differentially Adapted for Different Loads

Both chips are built on Fortior’s proprietary motor engine (ME) and 8051 dual-core parallel architecture, integrating high-precision ADCs, LDOs, and high-speed analog front-ends. While both adopt a single-shunt sensorless control approach, they are specifically differentiated to meet various power and speed requirements:

FU6561N/T: Versatile All-Purpose Solution

Supporting a wide input voltage range of 5V ~ 80V, the chip is fully compatible with 7-cell lithium-ion battery packs. It features both sensorless square-wave and quasi-sinusoidal drive algorithms, enabling low-barrier tuning and rapid deployment. It covers a broad spectrum of applications, ranging from 7-cell lithium-powered industrial tools and high-speed hair dryers to medium- and low-power handheld vacuum cleaners, with power ratings spanning 60W to 1800W.

FU6565N/T: High-Performance FOC Solution

Designed specifically for ultra-high-speed fan applications and compatible with 7-cell lithium devices, the chip features single-shunt sensorless FOC vector control. It supports high carrier frequency output and delivers outstanding torque-ripple suppression. Ideal for robot vacuum main suction fans and high-power upright vacuum cleaners, it covers power ratings up to 1800W and supports stable operation at extreme speeds of up to 160,000 RPM.

2. Application Solutions by Scenarios

Scenario 1 ｜ Power Tools ｜ FU6561N/T Solution

FU6561N/T effectively resolves common motor control challenges, such as reverse rotation during startup, weak stall torque, and low-voltage torque decay. Powered by a high-precision sensorless startup algorithm, it accurately locks the rotor position to prevent initial reverse deflection, ensuring continuous high torque delivery at low speeds and under stall conditions. Combined with a 5V ~ 80V wide-voltage architecture, it meets the power and speed demands of various heavy-duty equipment. Additionally, its dual speed-control interfaces facilitate easy debugging and ensure excellent production consistency.

Technical Highlights

(1) 5V ~ 80 V Wide-Voltage Coverage

The chip is fully compatible with 7-cell high-power lithium battery packs. With a maximum power output of 1800W and a wide speed range of 3,000RPM ~ 30,000RPM, it perfectly adapts to the rigorous demands of industrial and gardening heavy-duty equipment.

(2) Flexible Control & Speed Regulation

The chips features single-shunt sensorless square-wave control with seamless open/closed-loop dual-mode switching. Equipped with both VSP analog voltage control and UART digital serial speed control, it is highly suitable for multi-speed applications and smart digital-display tool designs.

Real-World Performance

In a stall test on an 18V, two-pole-pair electric wrench prototype, the bus peak current exceeded 48A with the motor fully locked. The system continuously maintained torque output, ensuring zero power loss under heavy loads. Furthermore, the standardized parameter library seamlessly adapts to multiple motors, delivering smooth, jitter-free startup and excellent batch-to-batch production consistency.

 Specifications

- Voltage Range: 5V ~ 80V

- Power Raneg: Up to 1800W

- Speed Range: 3000RPM ~ 30000RPM

- Control Method: Single-shunt sensorless square-wave control

- Loop Control: Open-loop or closed-loop control

- Speed-Control Interface: VSP/UART

- Key Advantages: High torque, high integration, simplified debugging, high cost-effectiveness

Scenario 2 ｜ Vacuum Cleaners ｜ FU6561 + FU6565 Solution

Fortior has developed a dual-chip portfolio covering all major categories of cleaning equipment—including mid-to-high-end upright vacuums, portable handhelds, car vacuums, and mite removers. Comprising the premium FU6565 quiet FOC solution and the cost-effective FU6561 quasi-sinusoidal solution, this matrix fully addresses high-, mid-, and low-end product lines. It strikes an optimal balance between quiet operation, ultra-high speed, stable suction, low power consumption, and high cost-effectiveness.

(1) FU6565: High-Performance Sensorless FOC Solution

Designed specifically for high-power vacuum cleaners, this chip utilizes a single-shunt sensorless FOC drive that eliminates tedious motor calibration. It achieves stable closed-loop operation within milliseconds of power-on, effectively resolving high-speed jitter and speed drift. The high-carrier-frequency algorithm suppresses torque ripple, significantly reducing operating noise and vibration, making it ideal for premium quiet vacuum cleaners.

Supporting stable output at speeds up to 200,000RPM, the chip employs power closed-loop control to maintain constant suction. Optimized current waveforms reduce heating losses and extend battery life. Furthermore, integrated protections against overcurrent, stall, undervoltage, and over-temperature ensure enhanced durability even under complex conditions like blocked air ducts.

(2) FU6561: Sensorless Quasi-Sinusoidal Solution
Targeting lightweight designs with minimal hardware, this solution is optimized for 16V portable vacuum cleaners. Featuring Fortior’s proprietary SVPWM forced-start algorithm, it requires no motor parameter calibration and is compatible with mainstream high-speed fans. It smoothly transitions to quasi-sinusoidal drive during startup, significantly reducing the vibration and acoustic noise typical of traditional square-wave solutions.

The built-in speed closed-loop maintains stable suction even as battery voltage drops, while multiple speed-control interfaces support versatile multi-speed frequency control. Its Hall-free architecture eliminates the need for sensors, simplifying assembly and reducing production failure rates.

(3) General Specifications & Core Advantages
With a 5V ~ 30V voltage range and 60W ~ 1200W power coverage, these solutions are perfectly suited for car vacuums, handhelds, uprights, and mite removers. Both offerings feature wide-voltage adaptation, rapid closed-loop response, stable suction, and low noise. The standardized algorithm enables one-step motor matching, drastically shortening both development and production cycles.

 Specifications

- Voltage Range: 5V ~ 30V

- Power Range: 60W ~ 1200W

- Speed Range: 30000RPM ~ 200000RPM

- Control Method: Single-shunt sensorless FOC control (FU6565) | Sensorless quasi-sinusoidal control (FU6561)

- Closed-loop Control: Power closed-loop

- Speed-Control Interface: PWM/VSP/UART

- Key Advantages: Ultra-high speed, high integration, simplified debugging, high cost-effectiveness

Scenario 3 ｜ High-Speed Hair Dryers ｜ FU6561 General Drive Solution

FU6561 effectively resolves common challenges in high-speed blowers, such as slow startup, high-speed step-loss, and complex wiring in compact form factors. Utilizing a sensorless square-wave startup that requires no motor parameters, it quickly establishes a closed-loop after power-on, ensuring stable high-speed operation at up to 120,000RPM. The minimal single-shunt peripheral circuitry is perfectly suited for compact designs, while the dedicated speed closed-loop control limits temperature rise and stabilizes rotational speed for reliable, long-term continuous operation.

Technical Highlights

(1) Parameter-Independent Startup Logic
The sensorless square-wave startup does not rely on inherent motor parameters such as inductance and resistance, rapidly establishing a speed closed-loop after power-on. Compatible with common 5V ~ 20V lithium platforms, it operates stably across a wide speed range from tens of thousands to over 150,000RPM, making it ideal for high-performance hair dryers and other high-speed BLDC applications.

(2) Minimalist Hardware Design
An ultra-simple single-shunt sampling architecture significantly reduces the peripheral component count, facilitating lightweight and portable structural designs.

(3) Robust Continuous Operation
Dedicated speed closed-loop control keeps temperature rise in check during extended full-speed operation. This ensures strong operational stability and helps reduce after-sales failure rates.

  Specifications

- Voltage Range: 5V ~ 20V

- Power Range: 60W ~ 600W

- Speed Range: 30000RPM ~ 200000RPM

- Control Method: Single-shunt sensorless square-wave control

- Closed-loop Control: Speed closed-loop control

- Speed-Control Interface: PWM/VSP

- Key Advantages: Ultra-high speed, high integration, simplified debugging, high cost-effectiveness

  Scenario 4 ｜ Robot Vacuum Cleaners ｜ FU6565N High-performance FOC

FU6565N effectively resolves common challenges in robot vacuums, such as restricted fan space, excessive high-frequency noise, and suction decay at low voltages. Utilizing a high-carrier-frequency sensorless FOC algorithm, it delivers high static pressure and strong suction while effectively suppressing vibration and noise. Furthermore, its coordinated speed and power dual closed-loop control maintains stable suction even as battery voltage drops, with a single-chip architecture significantly simplifying the overall system circuit.

Technical Highlights

(1) High Static Pressure for Deep Cleaning
The chip provides 50kHz high-carrier FOC vector control with algorithms specifically optimized for 3-pole-pair robot vacuum fans. At 16.8V, the fan reaches 97,000RPM with a static pressure of up to 30kPa, delivering powerful deep-dust cleaning performance.

(2) Superior Acoustic Performance
The chip deeply suppresses torque ripple to ensure low-vibration, low-noise fan operation, greatly enhancing the end-user experience.

(3) Consistent Suction Output
The chip features coordinated speed and power dual closed-loop control that automatically stabilizes suction output during low-battery conditions, effectively mitigating suction decay caused by voltage drops.

  Specifications

- Rated Power: 420 W

- Maximum Speed: Up to 160,000RPM

- Applicable voltage: 10V ~ 16.8V, matching mainstream robot-vacuum lithium systems

- Speed-Control Interface: PWM/VSP/UART, multiple options

- Integration Advantage: The single chip implements complete fan drive, simplifying the main board circuit

3. Five Core Technology Advantages

✔ Multi-Algorithm Differentiation for Precise Scenario Adaptation

Proprietary square-wave, quasi-sinusoidal, and FOC algorithms are specifically optimized for distinct applications: heavy-duty power tools (requiring high torque and stall torque retention) and high-speed cleaning fans (demanding high speed, low noise, and stable RPM). A single chip family seamlessly covers both heavy-duty power and high-speed fan equipment, overcoming the limited versatility and uneven performance of traditional solutions.

✔ Single-Shunt, Sensorless, Hall-Free Architecture: Reliable and Cost-Effective

The chip family utilizes a Hall-free, single-shunt sensorless drive, eliminating common failure points such as sensor dust accumulation, aging, and wire breakage to enhance long-term stability. This simplified hardware and assembly process significantly improves production yield and reduces after-sales costs.

✔ Highly Integrated Minimal Hardware for Compact Designs
By integrating ADC, analog front-end, 12V LDO, 5V LDO, and pre-driver into a single chip, the solution streamlines the BOM and drastically reduces PCB footprint. It is perfectly suited for lightweight and portable products, including handheld vacuum cleaners, high-speed hair dryers, and compact lithium tools.

✔ Wide Voltage Range + Dual Closed-Loop Control for Stable Operation
FU6561/FU6565 portfolio covers a wide voltage range of 5V ~ 80V for lithium battery applications. The coordinated speed and power dual closed-loop control dynamically adapts to voltage and load fluctuations, ensuring consistent torque under heavy tool loads and constant suction in cleaning equipment.

✔ Simplified Debugging + Local Support for Rapid Mass Production
A built-in standardized algorithm library, paired with a host PC tool, enables rapid motor adaptation and significantly shortens the R&D cycle. Backed by Fortior’s local support team, the solution provides comprehensive technical assistance from initial design and tuning to mass production, accelerating time-to-market.

As the wireless lithium tool and cleaning appliance markets continue to expand, product competition is increasingly centered on high torque, ultra-high speeds, low noise, and extended battery life. Powered by proprietary sensorless drive algorithms, FU6561N/T and FU6565N/T successfully balance heavy-duty power with high-speed fan requirements, covering the full spectrum of models from entry-level to flagship.

These solutions have successfully completed sampling validation with leading domestic tool and cleaning brands. Multiple vacuum cleaner and high-speed hair dryer products are now in mass production, delivering independent, high-performance BLDC drive solutions for the Chinese wireless lithium equipment industry.