Transcription of Pulse Width Modulated (PWM) Drives - Rockwell …
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Pulse Width Modulated (PWM) Drives - Rockwell …
Pulse Width Modulated (PWM) DrivesAC Drives Using PWM TechniquesPower Conversion UnitThe block diagram below shows the power conversion unit inPulse Width Modulated (PWM) Drives . In this type of drive , adiode bridge rectifier provides the intermediate DC circuitvoltage. In the intermediate DC circuit, the DC voltage is filteredin a LC low-pass filter. Output frequency and voltage iscontrolled electronically by controlling the Width of the pulses ofvoltage to the , these techniques require switching the inverterpower devices (transistors or IGBTs) on and off many times inorder to generate the proper RMS voltage GeneratorThis switching scheme requires a more complex regulator thanthe Variable Voltage Input (VVI). With the use of amicroprocessor, these complex regulator functions areeffectively handled. Combining a triangle wave and a sine waveproduces the output voltage Conversion Unit (PWM) Pulse Width Modulated (PWM)TriangleGeneratorModulationGenerato rPWMThe triangular signal is the carrier or switching frequency of theinverter.
Sensorless Vector Sensorless vector control, like a volts/hertz drive, continues to operate as a frequency control drive with slip compensation keeping actual motor
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