Electrical machine
An integrated starter generator device comprising a housing, a stator and a rotor contained within the housing, the device further comprising control electronics operable to configure the device as either a starter or generator and contained entirely within the housing. The device may include a high current terminal having brass and rubber bonded together. The rubber forms both a sealing and an insulating function.
1. An integrated starter generator device comprising a housing, a switched, reluctance machine, and control electronics operable to configure the device as either a starter or generator,
the switched reluctance machine comprising stator windings and a rotor contained within the housing,
the control electronics being contained entirely within the housing,
wherein
the control electronics are operable to switch the stator windings of the switched reluctance machine;
the control electronics include a power printed circuit board (PCB) having a peripheral edge;
the stator windings are terminated within the housing at the said power PCB;
the switching of the stator windings is carried out using power Field Effect Transistors (FETs); and
the FETs are located around the periphery of the power PCB and are the components closest to the peripheral edge of the power PCB.
2. The device according to claim 1 , wherein the FETs are thermally coupled to the housing via the power PCB and whereby the device is further arranged to cool the housing adjacent the FETs to remove heat from the FETs.
3. The device according to claim 1 wherein the power PCB carries a predetermined area of conductive material having a predetermined resistivity and cross section and wherein the output or input current in generator or motor operation respectively is caused to flow through the said area and whereby the current flow out of or into the device in the respective operating modes, is determinable by measuring the potential difference between predetermined positions on the said area.
4. The device according to claim 2 wherein the power PCB carries a predetermined area of conductive material having a predetermined resistivity and cross section and wherein the output or input current in generator or motor operation respectively is caused to flow through the said area and whereby the current flow out of or into the device in the respective operating modes, is determinable by measuring the potential difference between predetermined positions on the said area.
5. A device according to claim 3 , wherein a plurality of high power capacitors are held on the power PCB ( 2 ) and are inserted and thermally coupled into wells formed in the housing material and whereby the device is further arranged to cool the wells to remove heat from the capacitors.
6. A device according to claim 3 , wherein the power PCB further includes a multiway connector extending generally perpendicular to the plane of the board, and which is arranged to mechanically locate and electrically connect to a control PCB.
7. A device according to claim 5 , wherein the power PCB further includes a multiway connector extending generally perpendicular to the plane of the board, and which is arranged to mechanically locate and electrically connect to a control PCB.
8. A device according to claim 6 , wherein the control PCB is arranged to communicate with the power PCB to select between starter or generator operation.
9. A device according to claim 6 , wherein the control PCB is arranged to communicate with an engine management system of a motor vehicle and wherein the control PCB includes a multiway connector which is couplable to a vehicle communications bus.
10. A device according to claim 6 , wherein the control PCB is arranged to communicate with an engine management system of a motor vehicle and wherein the control PCB includes a multiway connector which is couplable to a vehicle communications bus.
11. A device according to claim 8 , wherein the control PCB is arranged to communicate with an engine management system of a motor vehicle and wherein the control PCB includes a multiway connector which is couplable to a vehicle communications bus.