An electronic determination device for determining at least one characteristic parameter (R s, R req, Lf, L) of an electric machine connected to an electric starter, the electric machine having P phases, P being equal to 3, the electric starter being adapted to be connected to an alternative power source and including at least P-1 switching arms, each switching arm being connected to a respective phase of the electric machine, the determination device comprising: - a control module configured to control respective switching arm(s) to close and the other switching arm(s) to open, so as to generate a current injection on two phases of the electric machine; - an acquisition module configured to acquire measurements of respective current(s) (I 1, I 2) and voltage(s) (U 1, U 2) for said two phases, further to the generation of the current injection; and - a calculation module configured to calculate at least one characteristic parameter (R s, R req, Lf, L) of the electric machine according to the respective current(s) (I 1, I 2) and voltage(s) (U 1, U 2) measurements, characterized in that the determination device is configured to determine a respective characteristic parameter (R s, R req, Lf, L) of the electric machine in at least two successive sequences, and in that, during each sequence, the control module is configured to control respective switching arm(s) to close and the other switching arm to open, so as to generate a current injection on two phases of the electric machine; the acquisition module being configured to acquire measurements of respective current(s) and voltage(s) for said two phases, further to the generation of the current injection; and the calculation module being configured to calculate the characteristic parameter (R s, R req, Lf, L) of the electric machine according to the respective current(s) and voltage(s) measurements for the respective sequence, and in that the open switching arm varies from one sequence to the other, so that each one of at least two switching arms is opened once during the successive sequences. the determination device comprising: - a control module configured to control respective switching arm(s) to close and the other switching arm(s) to open, so as to generate a current injection on two phases of the electric machine; - an acquisition module configured to acquire measurements of respective current(s) (I 1, I 2) and voltage(s) (U 1, U 2) for said two phases, further to the generation of the current injection; and - a calculation module configured to calculate at least one characteristic parameter (R s, R req, Lf, L) of the electric machine according to the respective current(s) (I 1, I 2) and voltage(s) (U 1, U 2) measurements, - a control module configured to control respective switching arm(s) to close and the other switching arm(s) to open, so as to generate a current injection on two phases of the electric machine; - an acquisition module configured to acquire measurements of respective current(s) (I 1, I 2) and voltage(s) (U 1, U 2) for said two phases, further to the generation of the current injection; and - a calculation module configured to calculate at least one characteristic parameter (R s, R req, Lf, L) of the electric machine according to the respective current(s) (I 1, I 2) and voltage(s) (U 1, U 2) measurements, characterized in that the determination device is configured to determine a respective characteristic parameter (R s, R req, Lf, L) of the electric machine in at least two successive sequences, and in that, during each sequence, the control module is configured to control respective switching arm(s) to close and the other switching arm to open, so as to generate a current injection on two phases of the electric machine; the acquisition module being configured to acquire measurements of respective current(s) and voltage(s) for said two phases, further to the generation of the current injection; and the calculation module being configured to calculate the characteristic parameter (R s, R req, Lf, L) of the electric machine according to the respective current(s) and voltage(s) measurements for the respective sequence, and in that the open switching arm varies from one sequence to the other, so that each one of at least two switching arms is opened once during the successive sequences.