Download>Category>Industrial Control>Electric Motor>Answers to Exercises in \"Electric Traction Automatic Control System\" by Chen Boshi (3rd Edition) Machinery Industry Press

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Answers to Exercises in \"Electric Traction Automatic Control System\" by Chen Boshi (3rd Edition) Machinery Industry Press

2013-09-20
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Closed-loop controlled DC speed regulation system 1-1 Why can the PWM-motor system achieve better dynamic performance than the thyristor-motor system? Answer: The PWM-motor system has great advantages in many aspects: (1) The main circuit is simple and requires fewer power devices. (2) The switching frequency is high, the current is easy to be continuous, the harmonics are small, and the motor loss and heat generation are small. (3) The low-speed performance is good, the steady-speed accuracy is high, and the speed regulation range is wide, which can reach about 1:10000. (4) If combined with a fast-response motor, the system has a wide frequency band, fast dynamic response, and strong dynamic anti-interference ability. (5) The power switching device works in the switching state, and the conduction loss is small. When the switching frequency is appropriate, the switching loss is also small, so the device efficiency is higher. (6) When the DC power supply adopts uncontrolled rectification, the power factor of the power grid is higher than that of the phase-controlled rectifier.

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