Method for generating cosine differential signal

The invention relates to a method for generating a cosine differential signal. The method comprises the steps of: calculating anticosine by using a DSP (digital signal processor), equally dividing a domain of definition [-1,1] into 10000 parts, namely, 10000 control pulses can be output within a period, converting each part into an IQ value, calculating an anticosine value according to the values of the equally divided values, wherein the anticosine value corresponds to an angle; converting the IQ values into a floating-point number, figuring out the angle difference of each part, multiplying the angle difference of each part by a coefficient, converting into an integer, storing the calculated value as an array DATA [10000], wherein the array value is used as the reference calculated by a CPU (Central Processing Unit) timer; enabling each value of the array to correspond to an actual pulse width, and interrupting the output through timing of a DSP timer to form a difference pulse signal capable of controlling the position of the motor. According to the method, the anticosine basic value is stored by adopting an array mode, and thus the operation time of the DSP is greatly reduced, and the output waveform is high in precision, stable, and high in reliability.