Motor-driven spreading system and method thereof

Abstract

The invention discloses a motor-driven spreading system and a method thereof. The spreading system comprises an adjusting unit, a waveform generating unit, a comparing unit, a driving unit and a motor unit. The adjusting unit generates a first adjusting parameter and a second adjusting parameter. The waveform generating unit is connected to the adjusting unit and generates a plurality of spreading waveforms according to the first adjusting parameter. The comparing unit is connected to the waveform generating unit and the adjusting unit, receives the plurality of spreading waveforms and compares the same with the second adjusting parameter, and generates a plurality of pulse wave modulation waves having a different frequency and the same percentage duty cycle width. The driving unit is connected to the comparing unit, receives the plurality of pulse wave modulation waves, and generates a driving signal. The motor unit receives the driving signal to actuate the motor unit. The plurality of pulse wave modulation waves are modulated to have the same duty cycle and different frequency, thereby reducing electromagnetic interference in a motor system and improving stability of a motor and electronic system.

Description

technical field [0001] The present invention relates to a spread spectrum system and its method, in particular to a motor-driven spread spectrum system and its method. Background technique [0002] Electromagnetic Disturbance (EMI for short) may be electromagnetic noise, unwanted signals, or changes in the transmission medium itself. For brushless DC motors, it generally contains periodic pulse waves as the driving source. This square wave is composed of odd sine waves. Each sine wave will imply a fixed-frequency surge energy. This surge energy It is often the source of EMI, and the source of EMI often causes system interference and affects other electronic equipment or motor systems. [0003] Next, please refer to figure 1 , the architecture of the motor system in the prior art, including: a control unit 10 , a drive unit 20 and a motor unit 30 . Generally, the control unit 10 generates a pulse width modulated wave with a fixed period to the driving unit 20 , and then ge...

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Problems solved by technology

[0005] However, the problems of the existing technology often lead to a substantial increase in the cost of the motor system, because most of the traditional filters use type filters, and their structures are a combination of capacitors and inductors, and often require two stages. , its price is often high, so it is necessary to propose a new method and structure, which can reduce the EMI problem in the motor system and greatly reduce the cost. This is the direction of all manufacturers' efforts

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