Abstract:
The disclosure relates to a drive arrangement (1 ) for a cycloidal marine propulsion unit (2). The drive arrangement (1 ) comprises at least two electrical blade motors (3a) each associated to a respective blade (3) for pivoting thereof, each blade motor (3a) being operationally coupled to a respective blade drive (3b) for actuating the corresponding blade motor. The at least two blade drives (3b) each comprise a respective blade drive power converter operationally coupled to a first common intermediate DC-link (4), wherein the at least two blade drives (3b) being configured to feed power from the first common intermediate DC-link (4) to their respective blade motors (3a), and to feed regenerative power from their respective blade motors (3a) to the first common intermediate DC-link (4). The disclosure also concerns a marine propulsion unit having such a drive arrangement, and a method of operating such a drive arrangement.
Abstract:
A switching device which comprises: a body (2) which has a first side wall (21) and a first end wall (23), the first side wall (21) being perpendicular in relation to a longitudinal direction, and the first end wall (23) is substantially perpendicular to the first side wall (21); and a first fixed contact (41) comprising an inner section (412) and an outer section (414), the inner section (412) having a thickness dimension, the outer section (414) protrudes from the first side wall (21) in the longitudinal direction. The first fixed contact (41) comprises a test terminal (11) which is integral to the inner section (412) and protrudes from the inner section (412) in a lateral direction, which is perpendicular to the longitudinal direction and an end wall plane defined by the first end wall (23), the test terminal (11) having a substantially planar test terminal surface (115), and the test terminal (11) has a thickness dimension which is parallel to the thickness dimension of the inner section (412), the thickness dimension of the test terminal (11) is substantially smaller than the thickness dimension of the inner section (412), the test terminal (11) is accessible from outside the body (2) from the direction of the first end wall (23), and the test terminal (11) is adapted to be connected to a female connector.
Abstract:
According to an example aspect of the present invention, there is provided a steering system (30) of an azimuthing propulsion system (1), the steering system (30) comprising at least one hydraulic motor (2) configured to operate an azimuthing system of a propulsion unit (3), the propulsion unit (3) being arranged outside a vessel, a fluid cycle (4) from the at least one hydraulic motor (2) via a separate hydraulic overload protection unit and back to the motor (2), the overload protection unit comprises a pressure relief unit and a heat management unit, and wherein the pressure relief unit comprises a pressure relief valve (5), andthe heat management unit comprises a heat storage, a heat exchanger, or a combination of both, and wherein the fluid cycle (4) comprising the overload protection unit (32) is configured to at least partially absorb heat generated during turning of the propulsion unit (3).
Abstract:
There is provided a control arrangement for controlling at least two azimuthing propulsion units of a ship. The control arrangement comprises a crash stop activation member for activating a crash stop procedure, after which the crash stop procedure is executed in which the orientation and propulsion speed of the azimuthing propulsion units are controlled until the propagation speed of the ship has at least been reduced from the moment when the crash stop procedure was activated.
Abstract:
A ship comprising a hull (100) having a transom (106) and a bottom (102), and an azimuthing propulsion unit (110) arranged to the bottom of the ship hull, which azimuthing propulsion unit comprises a propeller (118). The azimuthing propulsion unit (110) comprises an exposed operation mode in which the propeller (118) sets, behind the transom (106) of the hull (100) and that the azimuthing propulsion unit (110) is rotatable and comprises a protected position mode in which the azimuthing propulsion unit (110) stays below the hull (100) of the ship.
Abstract:
The invention relates to a pod propulsion unit of a ship. The pod propulsion unit comprises a pod housing (1) arranged at least partly below a hull (2) of the ship, an electric propeller motor (3) within a motor gondola (4) of the pod housing (1), an annular gap (8) between a rotor (6) and a stator (7) of the electric propeller motor (3), and gas channels (9) extending through the rotor (6), a closed cooling gas circuit (10), and a fan (11) for circulating gas in the closed cooling gas circuit (10). The closed cooling gas circuit (10) comprising a feeding duct (27) extending between the return duct (28) and the first motor end face (30) of the electrical propeller motor (3), and a return duct (28) extending between the feeding duct (27) and the opposite second motor end face (31) of the electrical propeller motor (3).
Abstract:
A contact system is provided. The contact system includes a fixed contact (20); a moving contact (10) configured to be in connection with or released from the fixed contact; a contact carrier (30) having a first side and a second side and movably carrying the moving contact at the second side; a cam (40) configured to press the contact carrier from the first side; and a spring (50) configured to press the contact carrier from the second side through the moving contact, wherein the contact carrier has an arc portion at the second side to be in contact with the moving contact. A cam switch including the contact system is also provided. The contact system can lower the possibility that the moving contact is side-tumbled or offset, promote the elimination of the heat, reduce the temperature, and decrease the possibility of fusion welding with the simple structure and high performance.
Abstract:
A rotary switch housing (100), comprising a bottom wall (102) for mounting of the switch housing (100) to a mounting base, and side walls (104, 106) extending from the bottom wall (102), the switch housing further comprising an arc chamber (120) for extinguishing an electric arc, and a gas exhaust channel (130) for exhausting gas developed in the arc chamber (120) out of the housing (100). The gas exhaust channel (130) comprises a guiding portion (130A), which is substantially parallel to a side wall (106) of the housing (100) for leading the gases to a direction away from the bottom wall (102) of the housing (100).
Abstract:
A switch assembly (1) for switching electric circuits comprises a contributory switch (3), a main switch (2), and a flexible element (4). The contributory switch (3) and the main switch (2) are connected electrically in series, the contributory switch (3) and the main switch (4) each comprise at least one movable contact and the flexible element is connected to one movable contact of the contributory switch, a first contact (5a), and one movable contact of the main switch, a second contact (6a).
Abstract:
An electric switch, comprising a movable contact (108, 10, 112) and a stationary contact (104, 106) for being contacted by the movable contact(108, 110, 112), the switch further comprising one or more quenching plates (122), and a permanent magnet (132) for directing an arc, that is formed when the contacts are separated from each other, to the quenching plate (122).The quenching plate (122) has a base portion (464) and side portions (468, 470) extending away from the base portion (464), and the permanent magnet (132) is arranged such that the arc is directed towards one of the side portions (468, 470) of the quenching plate (122).