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Variable Frequency Arduino Generator. 25 191 просмотр. 09:33. Arduino Pwm Tutorial #1 - How To Change Pwm Frequency.Get more details on this report - Request Free Sample PDF Micro power range variable frequency drive market size is anticipated to exceed USD 10 billion by 2026. Dynamic braking system, PWM frequency adjustment, speed control, and DC injection braking are the key features which will drive the product adoption across industrial establishments. Pulse width modulation (PWM) is a method of controlling the amount of voltage sent to a motor by converting the DC voltage into fixed values of individual DC pulses. Variable frequency drives must control the amount of voltage produced in order to control the speed and torque of a motor. Some months ago i built the above pwm with independent variable frequency and duty cycle using an Lm339. It worked a treat. Some on this forum suggested it could programmed. I'm a novice when it comes to programming i gave it a crack using a tutorial from a site (Engineers Garage). It only varied the frequency , but a good place to start.