A power system for an electric boat comprising:
- a propeller (70);
- an electrical generator (80);
- a plurality of rechargeable battery assemblies (10) having a battery voltage measurement device (11);
- an electric motor (30) comprising an auxiliary alternator (31), a drive shaft (32), a flywheel (33), and a rotational speed measurement device (34);
- a power controller (20) electrically connected to the auxiliary alternator (31);
- a first shaft (40) operatively connected to the drive shaft (32);
- a first clutch (41) and a bevel gear clutch (42) each operatively connected to the first shaft (40);
- a reduction gear (43) being in gear connection to the bevel gear clutch (42);
- a second shaft (50) operatively connected to the drive shaft (32);
- a second clutch (51) and a gearbox (52) each operatively connected to the second shaft (50);
- a third shaft (60) operatively connected to the drive shaft (32);
- a third clutch (61) operatively connected to the third shaft (60);
- a continuously variable transmission (62) operatively interconnecting the third shaft (60) and the electrical generator (80);
- a control panel (81) electrically connected to the electrical generator (80);
- a transformer (82) having one end electrically connected to the control panel (81);
- a first switch (13) adapted to electrically connect to one of the rechargeable battery assemblies (10) being discharged by switching;
- a second switch (14) electrically interconnecting the first switch (13) and the other end of the transformer (82);
- a capacitor (22) having one end electrically connected to the power controller (20);
- a third switch (12) having one end electrically connected to the other end of the capacitor (22) and the other end adapted to electrically connect to one of the rechargeable battery assemblies (10) being charged by switching;
- a charging controller (15) adapted to control the first and second switches (13, 14) and the battery voltage measurement devices (11) for charging one of the rechargeable battery assemblies (10), and control the third switch (12) to supply current from one of the charged rechargeable battery assemblies (10) to the power controller (20) via the third switch (12) and the capacitor (22);
- and
- a gear shift (90) adapted to control engagements and disengagements of the first clutch (41), the bevel gear clutch (42), the second clutch (51), and the gearbox (52);
- wherein in starting the electric motor (30) the third clutch (61) is not activated if a rotational speed of the drive shaft (32) measured by the rotational speed measurement device (34) does not reach a predetermined value, the power controller (20) gradually increases a current output to the electric motor (30) until the drive shaft (32) rotates at a predetermined rotational speed, the third clutch (61) is activated to transmit rotation of the drive shaft (32) to the electrical generator (80), and the activated electrical generator (80) generates electricity to charge one of the rechargeable battery assemblies (10) being discharged;
- wherein in response to activating the first clutch (41) rotation of the drive shaft (32) is transmitted to the first shaft (40), the bevel gear clutch (42) is activated to transmit rotation of the first shaft (40) to the propeller (70) for moving the boat via the reduction gear (43);
- and
- wherein in response to moving the boat the first clutch (41) is disengaged and the second clutch (51) is engaged so as to transmit the rotation of the drive shaft (32) to the second shaft (50), and the gearbox (52) is controlled by the gear shift (90) to increase a rotational speed of the propeller (70) until the boat moves in a cruising speed.