Speed Control of Asynchronous Traction Motor Based on Magnetic Flux Locus PWM Method;

Objective Pointing the blood pump based on an active magnetic bearing(AMB) system,this paper introduces a comparable optimized PWM ML4428 control chip,which provides all the functions necessary for controlling a blood pump.

In order to get a constant switching frequency, a approach to the design of PWM-based sliding mode variable structure controllers for DC-DC converters is proposed.

Second, a new PWM modulation technology is get in used.

Therefore, this article focuses on the multi-level cascade inverter PWM modulation technique, commonly used in the comparative study of several PWM modulation techniques, the proposed two types of PWM switching frequency modulation technique to improve the methods of optimization and the design of a variety of modulation technology to generate PWM wave circuit.

In order to reduce its torque ripple and improve its performance, the new PWM modulation strategy and new control topology for torque ripple suppression of the BLDCM are both studied in this dissertation.

The paper presents a detailed analytical study of the diode freewheeling of the inactive phase caused by the PWM modes in BDCM (Brushless DC Motor).

A class D power amplifier with low total harmonic distortion(THD) and high power supply rejection rate(PSRR) was presented,in which pulse width modulation(PWM),with double-sided sawtooth carrier of amplitude of 1 V,frequency of 300 kHz and nonlinearity of 0.

The pulse modulation technique is applied to increase the infrared communication distance,including pulse position modulation and pulse width modulation.