Abstract: A method of control of an electric motor involves generation of an electrical control signal for the electric motor, the signal having a series of sequences of pulses, each pulse being defined by a width and a period. The ratio of width to period defines a mean electrical power provided to the electric motor by this pulse. The period of a pulse situated at an arbitrary position of a sequence of pulses is equal to the period of the pulse situated at that position of any other sequence of pulses of the series, and the period of each pulse is fixed in a pseudo random manner, such that the inverse of the fixed period lies above the audible acoustic spectrum. The number of pulses of each sequence is fixed so that the inverse of the sum of the periods of all the pulses lies below the audible acoustic spectrum.

Abstract: The invention relates particularly to a method for controlling an electric motor, comprising generating, by means of an electronic control circuit, an electrical signal for controlling the electric motor. The aim of the signal generated is to reduce the electromagnetic parasites in AM radio bands as well as in the band [0 k Hz; 125 k Hz] (used particularly by RFID chips associated with certain sensors), without generating acoustic parasites in the audible frequency bands.