PWM Pulse Width Modulation

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  • Understanding the Effect of PWM when Controlling a Brushless DC Motor
    Designers of motion systems often face challenges when selecting or developing electronics using PWM (Pulse Width Modulation) to drive brushless DC motors. It is useful to keep in mind some basic physical phenomena to avoid unexpected performance issues. This document provides general guidelines
  • Driving DC Brushed Motors
    To control a DC motor, a variable, and controlled power supply is needed. There are three types of methods that can be used: Voltage-controlled linear supply. Current linear supply. PWM (Pulse Width Modulation)
  • Measuring Linear and Non-Linear AC Waveforms with CurrentWatch (.pdf)
    Variable frequency drives (VFDs) improve control and conserve energy by regulating motor speed. The most. common types are PWM (pulse width modulation) and Six Step. Both technologies are based on high speed switching, which distorts the AC sine wave and can make accurate current sensing difficult.
  • Low-Cost DC Motor Speed Control with CMOS ICs
    Two low-cost CMOS ICs manage a 12 VDC, current-limited speed control circuit for DC brush motors. The circuit design (see Figure 1) uses PWM (pulse width modulation) to chop the effective input voltage to the motor. Use of CMOS devices gives the benefits of low power, minimal heat and improved
  • Using the PWM
    The PICmico? family of RISC microcontrollers has been designed to provide advanced performance and a cost-effective solution for a variety of applications. This application note provides examples which illustrate some uses of Pulse Width Modulation (PWM) using the PIC17C42?s Timer1 or Timer2
  • Motor Inductance & PWM Frequency
    This paper discusses the effect of servo drive Pulse Width Modulation (PWM) frequency on heat generating current ripple in a permanent magnet motor. The basic idea of PWM is introduced and the RL circuit, which models the motor winding is reviewed. The concept of PWM average voltage and current
  • Controlling Brushed DC Motors with Pulsed-width Modulation (PWM)
    The enduring popularity of coreless brushed DC motors comes from a combination of their simplicity of design, fast transient responses, negligible iron losses and ease of control. With speed proportional to applied voltage, the motor can be simply driven using a continuous linear regulation power
  • Frequency and Resolution Options for PWM Outputs
    The PIC17C42 is equipped with two high frequency Pulse Width Modulation (PWM) outputs. In a pulse width modulated signal the period of the signal is (usually) kept fixed, while the duty cycle is varied. In this application note, we will discuss options in selecting PWM frequency and resolution

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