A DC chopper controls the speed of PMDC motor. The motor has 0.5 arma resistance and 0.05H armature inductance. DC bus voltage is 300V. In a specific condition, when the duty cycle is 0.5, the back EMF of the motor is 140V. chopping frequency is 1kHz. a. Sketch the circuit b. Find the maximum and minimum values of the motor current.

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A DC chopper controls the speed of PMDC motor. The motor has 0.52 armature
resistance and 0.05H armature inductance. DC bus voltage is 300V. In a specific load
condition, when the duty cycle is 0.5, the back EMF of the motor is 140V. The
chopping frequency is 1kHz.
a. Sketch the circuit
b. Find the maximum and minimum values of the motor current.
c. Calculate the power to the motor.
d. Find the Fourier series expansion of the load (motor) voltage.
e. Explain the motor behavior when duty cycle is decreased gradually.
f. If a low-pass filter (LC filter) connected to the motor terminals, explain
the operation of the circuit.
Transcribed Image Text:A DC chopper controls the speed of PMDC motor. The motor has 0.52 armature resistance and 0.05H armature inductance. DC bus voltage is 300V. In a specific load condition, when the duty cycle is 0.5, the back EMF of the motor is 140V. The chopping frequency is 1kHz. a. Sketch the circuit b. Find the maximum and minimum values of the motor current. c. Calculate the power to the motor. d. Find the Fourier series expansion of the load (motor) voltage. e. Explain the motor behavior when duty cycle is decreased gradually. f. If a low-pass filter (LC filter) connected to the motor terminals, explain the operation of the circuit.
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