Method and system for operating an electric machine
OwnerMarcus Heller, Robert Inderka +2inventors
InventorsMarcus Heller, Robert Inderka, Franz Nietfeld, Lars Weinschenker
Life of this patent
Estimating the term…
Abstract
In a method for operating an electric machine which is coupled to a drive shaft, the electric machine is connected to a high voltage direct-current power supply line (HDVC) by a switch and the rotational speed of the connected electric machine or of the drive shaft coupled with the electric machine is determined and the electric machine is disconnected from the high-voltage direct-current power supply line (HVDC) when the rotational speed of the electric machine or, respectively, the driveshaft is above a predetermined threshold.
Claims14
A method for operating an electric machine (1) comprising:
- connecting the electric machine (1) to a high-voltage direct-current power line (HVDC),
- operating said connected electric machine (1),
- determining an instantaneous rotational speed (n) of the connected electric machine (1) or of a drive shaft (4) coupled with the electric machine (1),
- disconnecting the electric machine (1) from the high-voltage direct-current power line (HVDC) if the instantaneous rotational speed (n) is above a predetermined threshold.
A system for operating an electric machine (1) comprising:
- a switching element (S, S′) for connecting the electric machine (1) to a high-voltage direct-current power line (HVDC),
- an inverter (2) arranged between the switching element (5, 5′) and the electric machine (1) for operating said connected electric machine (1),
- means (3) for determining a rotational speed (n) of the connected electric machine (1) or of a drive shaft (4) coupled with the electric machine (1),
- the switching element (S, S′) being controlled to disconnect the electric machine (1) from a high-voltage direct-current power supply line (HVDC) when the instantaneous rotational speed (n) is above a predetermined threshold.
A hybrid vehicle including:
- an electric machine (1),
- a combustion engine (5) with a driveshaft (4) coupled to the electric machine (1),
- a high-voltage direct-current power supply line (HVDC) for supplying electric power to the electric machine (1),
- a switching element (S, S′) for connecting the electric machine to the high-voltage direct-current power supply line (HVDC),
- an inverter (2) arranged between the switching element (S, S′) and the electric machine (1) for operating said electric machine (1) when the switching element (S, S′) is closed,
- a sensor (3) for determining a rotational speed of the connected electric machine (1) or of the driveshaft (4) coupled with the electric machine (1),
- the switching element (S, S′) being controlled to disconnect the electric machine (1) from the high-voltage direct-current power line (HVDC) when the rotational speed is above a predetermined threshold.
Dependencies are inferred from the claim text.