US 12,413,171 B2
Electric motor safe state control
Bruno Salle, Marseilles (FR); and Anselme Lebrun, Mougins (FR)
Assigned to SILICON MOBILITY SAS, Valbonne (FR)
Appl. No. 18/038,905
Filed by SILICON MOBILITY SAS, Valbonne (FR)
PCT Filed Nov. 27, 2020, PCT No. PCT/EP2020/083641
§ 371(c)(1), (2) Date May 25, 2023,
PCT Pub. No. WO2022/111813, PCT Pub. Date Jun. 2, 2022.
Prior Publication US 2024/0022202 A1, Jan. 18, 2024
Int. Cl. H02P 29/02 (2016.01); H02P 29/024 (2016.01); H02P 29/028 (2016.01); H02P 29/032 (2016.01)
CPC H02P 29/027 (2013.01) [H02P 29/028 (2013.01); H02P 29/032 (2016.02)] 20 Claims
OG exemplary drawing
 
1. An electric motor based system, comprising:
an electric motor;
an electric motor power controller for controlling the electric motor;
a first control unit, adapted to provide first control signals for the electric motor power controller;
an electric power storage device adapted to power the electric motor power controller;
a first sensor adapted to determine information related to power exchange between the electric power storage device and the electric motor power controller; and
a second control unit,
wherein:
the second control unit is adapted to pass the first control signals, received from the first control unit, to the electric motor power controller in a first mode and adapted to provide second control signals for the electric motor power controller in a second mode;
the second control unit inputs and exploits the information;
the second control unit inputs a fault signal and exploits the fault signal to switch between the modes; and
upon receipt of the fault signal:
(a) the second control unit provides second control signals to put the electric motor in free-wheel mode, thereafter monitoring the information; and
(b) upon exceeding a threshold, the second control unit provides second control signals to put the electric motor in active short circuit mode; and thereafter
(c) after a predetermined time of the electric motor being in active short circuit mode, return to (a).