The application of brushless DC motors in washing machines has become more common, and its market share is getting higher and higher with the need for energy saving and emission reduction and carbon neutrality. There are two main types of household washing machines: wave wheel washing machine and drum washing machine. They all have the characteristics of low speed and large torque start and wide speed control range. In particular, drum washing machines generally require a speed of 300-17000RPM. Therefore, the requirements for the control algorithm are very high. Washing machine motor control also has many additional functional requirements, such as detecting the weight of the clothing, whether the clothing is eccentric, etc.
As the "brain" of the brushless motor system command, the main control chip undertakes rich control tasks and poses a multi-dimensional challenge to the chip. In particular, home appliances with high frequency of use require high reliability, but also must meet the functional requirements of rapid response, precise control, and low noise.
FORTIOR fengjia chip has independent intellectual property rights of the motor control core ME, specially used for motor control, independently designed core architecture, can be customized for specific application needs to achieve customized product solutions, the company's chip products and programs are widely used in the field of white goods, based on FORTIO FENG's newly launched MCU chip FU6815L design of the washing machine motor control program, is to help improve the competitiveness of manufacturers' products, quickly obtain market share of the special chip program.
Highly integrated dual-core architecture with greater computing power and freedom of control
FU6815 series is a high-performance motor driver chip integrating motor control core (ME) and universal core 8051, ME integrates FOC, MDU, LPF, PID, SVPWM and many other hardware modules, which can automatically complete the operation and control of FOC drive/square wave drive of inductive/non-inductive BLDC/PMSM motor by hardware; The universal core 8051 is used for parameter configuration and routine transaction processing, and the dual-core parallel operation enables a variety of high-performance motor control. The chip integrates high-speed operational amplifiers, comparators, Pre-drivers, high-speed ADC, CRC, SPI, I2C, UART, LIN, a variety of TIMER and other functions, and has built-in high-voltage LDO, which is suitable for square wave and FOC drive control of BLDC/PMSM motors;
A large number of logic processing and data calculations are the challenges that must be faced in the product solution of the motor drive control chip in washing machine applications. In the traditional general MCU solution, foC module operation requires a lot of MCU resources, and will also compete with functions such as OOB detection and weighing to seize MCU resources, which will cause great pressure on system stability. FORTIOR Feng's special MCU chip FU6815L using dual-core architecture design, motor drive task by the motor control core ME to complete, completely do not occupy MCU resources, the universal core 8051 can focus on the realization of washing machine application layer functions, such as OOB detection, weighing, DOOB detection and other functions, dual-core drive innovative architecture design, so that the product to obtain higher reliability and accurate control capabilities.
FORTIOR peak washing machine solution
01 Low speed and high torque
02 Deep field weak algorithm
03 OOB, DOOB detection
04 Weighing algorithms
05 Perfect protection strategy
06 Rich debugging tools
Precise and intelligent control algorithms
Unleash the ultimate performance of chip technology and motor systems
Low-speed and large-torque function: FORTIOR Feng's self-developed AO adaptive observer can realize the ultra-low speed control of the motor, meet the requirements of the washing machine for low-speed torque and large load start-up, and solve the problem of high-stability start-up of the motor in mass production.
Deep weak magnetic algorithm: In the running cycle of the washing machine, the washing mode running time of the motor at low speed accounts for a relatively large proportion, in order to take into account the low-speed torque and efficiency, the motor design of the washing machine tends to focus on low-speed performance; and the dehydration mode with a small proportion of the running time is the need for the motor to run at high speed, and the conventional control method cannot be quickly switched to high-speed operation, and the weak magnetic algorithm is required to expand the speed of the motor. FORTIOR fengjiao washing machine scheme designed a deep weak magnetic field control algorithm, according to the desired speed, the current load size adaptive adjustment D, Q axis voltage current distribution, speed regulation linear stepless, while the voltage protection algorithm, can be a good solution to the deep weak magnetic field under the bus motor overshoot problem, improve the safety of deep weak magnetic.
Intelligent perception function: washing machine in dehydration need to detect the uneven distribution of clothing leads to the quality of the barrel eccentric, if the eccentric amount is very large, then in the dehydration high-speed operation, the washing machine will appear vibration, displacement, serious and even disintegration. This requires that the degree of eccentricity of the laundry bucket be detected before dehydration, that is, OOB detection. FORTIOR peak OOB detection accuracy can reach up to 20 grams, compared with similar products detection accuracy increased by about 50%-60%; in addition, as a supplement to the OOB detection of DOOB detection function, is a dynamic OOB detection, also known as diagonal eccentricity detection, mainly to prevent the movement of clothing during operation and lead to changes in eccentricity.
Weighing algorithm: In order to determine the maximum speed allowed when discharging water and dewatering, the clothes need to be weighed, the industry requires 500 grams, and the fortior peak washing machine weighing algorithm accuracy can reach 200 grams.
Multiple protection functions:
Over-voltage protection, voltage drop protection: Feng's patented algorithm for voltage protection under the weak magnetic state can effectively protect the bus voltage overshoot caused by accidents in the weak magnetic field and cause the hardware to burn out;
IPM temperature protection: detection and protection logic, according to the IPM temperature, actively adjust the operating power;
Motor temperature detection and protection: the motor temperature is calculated by the change of the resistance value of the motor winding, and the accuracy can reach 2 °C;
Blocked rotation protection: 4 detection methods to ensure that the motor can be protected in time when it is blocked;
Phase loss protection: the ability to detect specific missing phases before start-up;
FCT function: detect more than a dozen items, accurately locate the fault point, and facilitate the detection of bad PCBA in production;
Convenient debugging tools:
SPI hardware debugging tools are available: digital signals can be converted into analog signals with high real-time performance
Uart debugging host computer: Provide washing machine debugging using the host computer
Data logging: Provides additional Uart data transmission for long-term data monitoring during commissioning