A method for starting a permanent magnet synchronous electric motor comprising a rotor and a stator comprising coils respectively connected to a plurality of phases (P1-P3) and a conversion circuit connecting the plurality of phases (P1-P3) to a power supply source to control rotation of the rotor of said synchronous motor, said conversion circuit comprising a DC-DC converter supplying a DC-AC converter comprising a plurality of transistors (T1-T6) controllable in order to control rotation of the rotor according to a plurality of successive control phases (S1-S6), said method comprising: ° a step of controlling the transistors (S1-S6) of the DC-AC converter according to a driving table associating each control phase (S1-S6) to a configuration of said transistors (T1-T6) so as to determine an acceleration ramp of the rotor of the motor, which method is characterized in that it comprises: ∘ a step of determining an electrical angle A (E1-E2) from a predetermined acceleration ACC, the step of determining an electrical angle A comprising ▪ a first step of integrating the predetermined acceleration ACC so as to derive a speed V from the following equation: • V ( n) = V ( n -1) + T s * ACC + K * V ( n- 1) • where: • V(n) is the electrical speed V at time instant n • V(n - 1) is the electrical speed a time instant n-1, • T s is a sampling constant, • ACC is the predetermined acceleration, and • K is a speed correction constant. ▪ a second step of integrating the speed V so as to derive the electrical angle A, and ∘ a step of determining a control phase (S1-S6) change signal Q if electrical angle A is greater than a predetermined threshold angle A seuil. ° a step of controlling the transistors (S1-S6) of the DC-AC converter according to a driving table associating each control phase (S1-S6) to a configuration of said transistors (T1-T6) so as to determine an acceleration ramp of the rotor of the motor, ∘ a step of determining an electrical angle A (E1-E2) from a predetermined acceleration ACC, the step of determining an electrical angle A comprising ▪ a first step of integrating the predetermined acceleration ACC so as to derive a speed V from the following equation: • V ( n) = V ( n -1) + T s * ACC + K * V ( n- 1) • where: • V(n) is the electrical speed V at time instant n • V(n - 1) is the electrical speed a time instant n-1, • T s is a sampling constant, • ACC is the predetermined acceleration, and • K is a speed correction constant. ▪ a second step of integrating the speed V so as to derive the electrical angle A, and ▪ a first step of integrating the predetermined acceleration ACC so as to derive a speed V from the following equation: • V ( n) = V ( n -1) + T s * ACC + K * V ( n- 1) • where: • V(n) is the electrical speed V at time instant n • V(n - 1) is the electrical speed a time instant n-1, • T s is a sampling constant, • ACC is the predetermined acceleration, and • K is a speed correction constant. • V ( n) = V ( n -1) + T s * ACC + K * V ( n- 1) • where: • V(n) is the electrical speed V at time instant n • V(n - 1) is the electrical speed a time instant n-1, • T s is a sampling constant, • ACC is the predetermined acceleration, and • K is a speed correction constant. ▪ a second step of integrating the speed V so as to derive the electrical angle A, and ∘ a step of determining a control phase (S1-S6) change signal Q if electrical angle A is greater than a predetermined threshold angle A seuil.