Theoretically, PFM is a better motor control algorithm than PWM, because it can achieve higher energy efficiency and lower electromagnetic interference. Xilinx European motor control experts and third-party partners are the first in the industry to realize the motor control scheme based on PFM algorithm. By adopting PFM motor control scheme, electrical equipment suppliers can save a lot of extra costs caused by measures to eliminate EMI. Although the motor control scheme based on MCU and DSP platform has the advantage of low cost, the motor control scheme based on FPGA platform can make the time delay of motor control smaller and more accurate, thus making the motor more energy efficient and making the added value or differentiation advantage of motor equipment greater. Undoubtedly, high-end electrical equipment manufacturers will hope that FPGA suppliers can provide shorter and more accurate motor control schemes to help them realize the differentiated features of their products. Data to illustrate all the lower delay: at present, the motor control scheme usually realized by MCU in the industry generally has a delay of 40-50us; The motor control scheme realized by DSP generally needs 20-30us delay; If Spantan-6 FPGA is used to control motors, the minimum time delay can be reduced to 2.5us. Because MCU and DSP are both serial operation mechanisms, if they are used to control 4 or 8 motors, the maximum time delay will be increased by 4 or 8 times. However, FPGA is a parallel computing mechanism. No matter how many motors it controls, the delay of each motor is the same, which can reach 2.5 US. Cost advantage: From the cost of single board procurement, if the number of motors to be controlled at the same time exceeds 8, it is more advantageous to control the cost performance with FPGA. In fact, the motor control market that Xilinx strives for is also those multi-motor applications with high performance requirements. Extend the life of the motor: the motor is the most power-consuming equipment today, and 66% of the electric energy in the power grid is consumed by the motor. If the motor is well controlled, the money saved on the motor and the price of the control chip are far from an order of magnitude. And the life of the motor depends on the control mode. If it is well controlled, the life of the motor will be prolonged. Replacing the motor often means that the production line has to stop, which is why today's high-end motor equipment manufacturers are looking for a higher-end motor control scheme. Scalability: Xilinx PFM motor control scheme is scalable and can be transplanted from Spantan-6 FPGA platform to ZYNQ-7000 FPGA platform. About PWM and PFM PWM are abbreviations of English pulse width modulation. Using the digital output of microprocessor to control analog circuits is a very effective technology, which is widely used in many fields from measurement and communication to power control and conversion. PFM is called pulse frequency modulation in English, which means pulse frequency modulation. PFM is a pulse modulation technology: the frequency of the modulated signal changes with the amplitude of the input signal, and its duty cycle remains unchanged. PFM is usually used in DC-DC converter to improve light load efficiency. PFM pulse frequency modulation (PFM) has the characteristics of frequency modulation, and it is expected to have a high transmission signal-to-noise ratio. The pulse form of the signal is convenient for relay transmission, regeneration and shaping, so it can not only relax the tolerance requirements for system linearity, but also obtain better anti-interference ability. Pulse frequency modulation (PFM) is widely used in optical fiber communication because its transmission performance is much better than baseband direct light intensity modulation and its cost is much lower than pulse code modulation. Comparison between pulse frequency modulation and pulse width modulation 1. Advantages of pulse frequency modulation Compared with pulse width modulation (PWM), the main advantages of pulse frequency modulation (PFM) are efficiency: a. For the same pulse frequency modulation (PFM) and pulse width modulation (PWM) as peripheral circuits, its peak efficiency is equivalent to that of PWM, but before the peak efficiency, the efficiency of pulse frequency modulation (PFM) is much higher than that of pulse. B. Pulse width modulation (PWM) is limited in loop gain and response speed due to the influence of error amplifier, and the response speed of pulse frequency modulation (PFM) is faster. 2. Disadvantages of pulse frequency modulation The main disadvantage of pulse frequency modulation (PFM) compared with pulse width modulation (PWM) is that it is difficult to filter. B Before peak efficiency, the frequency of pulse frequency modulation (PFM) is lower than that of pulse width modulation (PWM), which will lead to the output ripple ratio being higher than that of pulse width modulation (PWM).