Abstract: A propulsion unit is disclosed, which can include a casing, a shaft, a propeller, an annular housing and a rim drive electric motor. The casing can be rotatably supported at a hull of a vessel. The shaft can be rotatably supported with bearings within a lower portion of the casing. A propeller can be attached to an outer end of the shaft protruding from the lower portion of the casing. The annular housing can surround an outer perimeter of the propeller and can form a duct for water flowing through the interior of the annular housing. The rim drive electric motor can include a rotor rim provided on an outer perimeter of the propeller and a stator provided within the annular housing. Oil lubricated roller bearings can be used on the shaft within the casing. The axial length of the propulsion unit can be short.

Abstract: A propulsion unit is disclosed, which can include a casing, a shaft, a propeller, an annular housing and a rim drive electric motor. The casing can be rotatably supported at a hull of a vessel. The shaft can be rotatably supported with bearings within a lower portion of the casing. A propeller can be attached to an outer end of the shaft protruding from the lower portion of the casing. The annular housing can surround an outer perimeter of the propeller and can form a duct for water flowing through the interior of the annular housing. The rim drive electric motor can include a rotor rim provided on an outer perimeter of the propeller and a stator provided within the annular housing. Oil lubricated roller bearings can be used on the shaft within the casing. The axial length of the propulsion unit can be short.

Abstract: An arrangement of a ship's propulsion unit includes a motor unit with a motor housing arranged in the water. A motor and related controls are provided in the motor housing. A propeller is arranged at an end of a motor shaft. The motor unit includes an electrical motor, wherein an entire circumferential surface of the electrical motor is cooled through a casing structure of the motor directly to the water surrounding the motor unit.

Abstract: An arrangement for a ship's propulsion unit includes a motor unit with a motor housing arranged in the water. A motor and related controls are provided in the motor housing. A propeller is arranged at an end of a motor shaft. The motor unit includes an electric motor, wherein an entire circumferential surface of the electrical motor is cooled through a casing structure of the motor directly to the water surrounding the motor unit.

Abstract: Switching mode power amplifiers using pulse width modulation (PWM) and pulse position modulation (PPM) for generating bandpass signals is disclosed. Fully digital implemented transmitter structures having QPSK inputs for phase and amplitude are described.

Abstract: In a modulation system, in order to provide a two-level signal with a desired modulation which is suited to be amplified by a switching mode power amplifier, the modulation system may include a first constant envelope modulator modulating a signal according to a first control signal, a second constant envelope modulator modulating a signal according to a second control signal, and a combining portion combining the output signal of the first and said second constant envelope modulator to a single, two-level pulse-width-modulated signal. The information which is to be represented by the modulation of the single, two-level pulse-width-modulated signal is coded in the first and the second control signals. The invention relates equally to a corresponding method for generating a modulated signal.

Abstract: An arrangement for a ship's propulsion unit includes a motor unit with a motor housing arranged in the water. A motor and related controls are provided in the motor housing. A propeller is arranged at an end of a motor shaft. The motor unit includes an electric motor, wherein an entire circumferential surface of the electrical motor is cooled through a casing structure of the motor directly to the water surrounding the motor unit.

Abstract: A propulsion unit arrangement for a ship including a motor housing, which is arranged in the water and contains a motor and a control unit. A propeller is arranged at a motor shaft. The motor housing is arranged as a separate modular motor unit, which can be attached to the ship by way of a fastening arrangement.

Abstract: A propulsion unit for a ship including a motor housing, which is arranged in the water and contains a motor and a control unit. A propeller is arranged at a motor shaft. The motor housing is arranged as a separate modular motor unit, which can be attached to the ship by way of a fastening arrangement.

Abstract: The invention relates to a power control structure comprising a switching mode power amplifier for receiving an input signal, for amplifying the received input signal and for providing the amplified signal as output signal. In order to enable a power control over a large range while preserving the efficiency of the power amplifier, the structure further comprises a first control arrangement for controlling the power level of the output signal at least at higher desired power levels by adjusting a power supply provided to the switching mode power amplifier, and in addition a second control arrangement for controlling the power level of the output signal at least at lower desired power levels by adjusting the power of the input signal before it is provided to the switching mode power amplifier. The invention relates equally to a corresponding method.

Abstract: The invention relates to a power control structure comprising a switching mode power amplifier for receiving an input signal, for amplifying the received input signal and for providing the amplified signal as output signal. In order to enable a power control over a large range while preserving the efficiency of the power amplifier, the structure further comprises a first control arrangement for controlling the power level of the output signal at least at higher desired power levels by adjusting a power supply provided to the switching mode power amplifier, and in addition a second control arrangement for controlling the power level of the output signal at least at lower desired power levels by adjusting the power of the input signal before it is provided to the switching mode power amplifier. The invention relates equally to a corresponding method.

Abstract: In a modulation system,.in order to provide a two-level signal with a desired modulation which is suited to be amplified by a switching mode power amplifier, the modulation system may include a first constant envelope modulator modulating a signal according to a first control signal, a second constant envelope modulator modulating a signal according to a second control signal, and a combining portion combining the output signal of the first and said second constant envelope modulator to a single, two-level pulse-width-modulated signal. The information which is to be represented by the modulation of the single, two-level pulse-width-modulated signal is coded in the first and the second control signals. The invention relates equally to a corresponding method for generating a modulated signal.

Abstract: The present invention relates to an installation arrangement for a ship's propulsion unit comprising a modular motor unit (1) located outside the ship's body. Said motor unit comprises a motor (25) and a propeller (5) and it is intended to be connected to a structure (3) connected to the ship. At the end (7) opposite to said propeller (5) said motor unit (1) comprises fitting means arranged for fitting said motor unit (1) longitudinally to corresponding fitting means (6, 12) arranged at said structure (3) connected to the ship. The present invention also relates to a method in this context, according to which method said motor unit (1) is fitted, by the use of a longitudinal displacement in the direction of the motor's shaft (26), to a fitting piece comprising a connector plug means (12) which co-operates with corresponding means at said motor unit for supplying electrical power to the motor.

Abstract: The present invention relates to a propulsion unit arrangement for a ship. The arrangement includes a motor unit (1) comprising a motor housing (6) which is arranged in the water and which comprises a motor (2) and any control means related thereto, as well as a propeller (4) which is arranged at a motor shaft (3). Said motor unit (1) comprises an electrical motor (2) for which the cooling is arranged to take place via the surface of the motor's whole circumference through the motor's casing structure (5) directly into the water which surrounds said unit (1).

Abstract: The present invention relates to a propulsion unit arrangement for a ship. The unit comprises a motor housing (6) which is arranged in the water (6) which is arranged in the water (6) and which comprises a motor (2) and any control means related thereto, as well as a propeller (4) which is arranged at a motor shaft (3). Said motor housing is arranged as a separate modular motor unit (1), which can be attached to the ship by means of fastening means (11, 16).

Abstract: Switching mode power amplifiers using pulse width modulation (PWM) and pulse position modulation (PPM) for generating bandpass signals is disclosed. Fully digital implemented transmitter structures having QPSK inputs for phase and amplitude are described.

Abstract: The course of an oscillating signal is controlled in mutually alternative first active component (31) and second active component (32), both of which can be set into active state by a certain first value of a control signal brought to the component and which are in inactive state with a certain second value of the control signal. The signal is directed to pass through the first active component (31) by setting it into active state by a control signal (33) brought to it. At the same time, the second active component (32) is prevented from affecting the course of the signal by setting a control signal brought to it to a second value (107, 111).