Patent ID: 8710776

Claim:
A method for controlling a motor by an inverter and by a vectorial technique, comprising the following steps: fixing a value of a quadrature current I q necessary for said motor to generate a desired torque; calculating a value of a direct current I d to be supplied to said motor by equation: I d = I q tan ⁡ ( k t ) where k t is a phase of a current vector from which a torque constant of said motor depends; calculating a power current of said motor by said direct current I d and said quadrature current I q ; supplying said power current to said motor by said inverter; and fixing rotation speed and position of a rotor of said motor without position and speed sensors, wherein said step of fixing rotation speed and position of said rotor comprises a sum of an additional substantially sinusoidal power voltage to a voltage power of said motor, and wherein said additional power voltage has a module variable with one or more of the rotation speed of said rotor or with a torque needed by said motor with a load thereof.