A braking system for waterborne propeller driven vessel which, upon activating a brake pedal or similar actuation device causes the vessel to almost immediately stop its forward movement. The system initiates a burst of highly amplified horsepower and torque, created by a controlled pulse of electrical power released from a bank of fully charged ultracapacitors. This pulse of electrical power is sent directly to AC induction-driven motors, causing oversized propellers to immediately rotate astern, thereby generating a reverse thrust in opposition to the vessel's forward movement sufficient to stop the vessel. The horsepower and torque produced by the braking system and operation of the present invention will also cause the oversize propellers to transmit this tremendous power into the water, without cavitation, to assist in stopping vessel movement.

A braking system for waterborne propeller driven vessel which, upon activating a brake pedal or similar actuation device causes the vessel to almost immediately stop its forward movement. The system initiates a burst of highly amplified horsepower and torque, created by a controlled pulse of electrical power released from a bank of fully charged ultracapacitors. This pulse of electrical power is sent directly to AC induction-driven motors, causing oversized propellers to immediately rotate astern, thereby generating a reverse thrust in opposition to the vessel's forward movement sufficient to stop the vessel. The horsepower and torque produced by the braking system and operation of the present invention will also cause the oversize propellers to transmit this tremendous power into the water, without cavitation, to assist in stopping vessel movement.

A braking system for waterborne propeller driven vessel which, upon activating a brake pedal or similar actuation device causes the vessel to almost immediately stop its forward movement. The system initiates a burst of highly amplified horsepower and torque, created by a controlled pulse of electrical power released from a bank of fully charged ultracapacitors. This pulse of electrical power is sent directly to AC induction-driven motors, causing oversized propellers to immediately rotate astern, thereby generating a reverse thrust in opposition to the vessel's forward movement sufficient to stop the vessel. The horsepower and torque produced by the braking system and operation of the present invention will also cause the oversize propellers to transmit this tremendous power into the water, without cavitation, to assist in stopping vessel movement.

In view of the problem that an existing technique can detect a failure in an arm circuit for each phase and continue motor drive by only a normal phase, but a brake torque is generated due to a closed circuit of the faulty phase, an inverter apparatus for polyphase AC motor drive is provided that includes: a first power supply switching device in a power supply line to an inverter circuit; a second power supply switching device for each phase in the arm circuit of the inverter circuit, and a motor relay switching device in an output path from each phase, wherein the parasitic diodes of the first power supply switching device and second power supply switching device have directional characteristics different from each other, which prevent generation of a closed circuit.

The disclosed embodiments relate to an electronic circuit for a motor-driven door of a rail vehicle, said electronic circuit having a series circuit of a first non-linear element and a first controllable switch between the motor terminals. The first non-linear element is poled such that the resistance thereof to a current generated by the drive motor during a closing movement of the door is greater than during an opening movement. If a supply voltage for the door is present, the resistance of the first switch is effected relative to the resistance when said supply voltage is absent. The invention further relates to a door module for a rail vehicle having such an electronic circuit, to a rail vehicle for such a door module, and to a use of the electronic circuit.

The disclosed embodiments relate to an electronic circuit for a motor-driven door of a rail vehicle, said electronic circuit having a series circuit of a first non-linear element and a first controllable switch between the motor terminals. The first non-linear element is poled such that the resistance thereof to a current generated by the drive motor during a closing movement of the door is greater than during an opening movement. If a supply voltage for the door is present, the resistance of the first switch is effected relative to the resistance when said supply voltage is absent. The invention further relates to a door module for a rail vehicle having such an electronic circuit, to a rail vehicle for such a door module, and to a use of the electronic circuit.

An improved system for monitoring vibration of an electric machine is disclosed. According to one embodiment, sensors are positioned in a plane orthogonal to the motor shaft and each sensor detects vibration along at least one axis of the motor. The sensors are oriented such that the polarity of each sensor is reversed. The pairs of sensors may be used to isolate specific vibrations within the motor. According to another embodiment, a sensor may be mounted directly to the motor shaft. The sensor on the motor shaft directly detects vibrations along the motor shaft. Optionally, a second sensor may be mounted to a fixed location within the motor housing, and the combination of the sensor on the motor shaft and the sensor at a fixed location may be used to isolate specific vibrations within the motor. A motor controller may adjust operation of the motor to reduce the isolated vibration.

An actuator (1) for driving a regulating element (30) for controlling a fluid flow in a flow channel (29) includes an electric motor (4) for driving the regulating element (30) and a control unit (2) for controlling a current provided to the electric motor (4). A resistive element (3) including a resistor (5) and a NTC thermistor (6) connected in parallel across the resistor (5) is positioned in a current path from the control unit (2) to the motor (4). Accordingly, when the ambient temperature increases, the decreasing resistance of the resistive element (3) counterbalances the increasing resistance of the motor windings, resulting in a less varying current from the control unit (2) to the motor (4) and therewith in a less varying output torque of the motor (4).

The chair lift for boats is a hoist designed to easily move a person with disabilities from a boat into and out of the water. The chair lift for boats comprises a mast, a boom, a hydraulic gantry, a chair, and an optional winch.

The chair lift for boats is a hoist designed to easily move a person with disabilities from a boat into and out of the water. The chair lift for boats comprises a mast, a boom, a hydraulic gantry, a chair, and an optional winch.