Abstract:
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.
Abstract:
The invention relates to a variable rotor speed wind turbine transmitting AC electric power to a utility grid. The wind turbine includes at least one AC generator and at least two power electronic converter units. Further, it includes means for transforming at least one nominal output value of the generator to at least one different nominal input value of the at least two power electronic converter units. The invention also relates to a wind park and a method of transmitting AC electric power to a utility grid from a variable rotor speed wind turbine as well as a method of servicing or inspecting a variable rotor speed wind turbine.
Abstract:
A radio frequency (“RF”) remote control device for use to control the speed of a motor is disclosed. In one preferred embodiment, the device may be used by a swimmer in a swim spa. The RF device can be preferably formed in shape of a glove to be worn by the athlete/swimmer, such that he or she can readily change the speed of the swim spa current motor, and in turn the speed of the current he or she is swimming against simply by activating respective increase or decrease motor speed signals. In further embodiments, the RF device can also include a stop watch to record duration of exercise, and/or an automatic stroke counter to record the number of strokes during the exercise.
Abstract:
According to the voltage VU that occurs at one end of at least one of multiple coils of a fan motor, a back electromotive force detection circuit generates a detection signal BEMFU asserted in a cyclic manner when a fan motor is stably rotating. A lock protection circuit detects a lock state of the fan motor rotor. A period detection unit measures the detection signal BEMFU period. A synchronization pulse generating circuit generates a synchronization pulse having a period that is 1/N (N represents an integer of 2 or more) of that of the detection signal BEMFU measured in a previous cycle. A lock judgment unit counts the synchronization pulse in increments of cycles of the detection signal BEMFU. When the count value exceeds a predetermined threshold value M (M represents an integer of 2 or more) which is greater than N, the lock mode judgment signal is asserted.
Abstract:
An integrated DC circuit for a ceiling fan combined with a lamp is composed of a control circuit connected with a motor and a lamp, and a rectifying-filtering circuit connected with the control circuit. The rectifying-filtering circuit can alter an exterior AC power into a DC power for the motor and the lamp to use. As the motor and the lamp use the same DC power, electric leakage can be minimized to upgrade security and only a simplified structure with less material is needed, posing a reduction of cost.
Abstract:
An outer-rotor variable-speed motor, to which single-phase AC power is applied and on which a rotor is provided outside a stator, comprises first and second main windings provided on a stator of the motor to form a plurality of poles, a frequency detector for detecting the frequency of AC power applied to the motor, and a relay for connecting the first and second main windings in series if the detected frequency is 60 Hz and connecting the first and second main windings in parallel if the detected frequency is 50 Hz. The speed of the motor is kept constant even when power at different frequencies is applied, so that it is possible to reduce the manufacturing cost of the motor and reduce the power consumption, and also to reduce electromagnetic noise from the motor.
Abstract:
A motor speed controller for use with dc motors, such as found in model (slot) cars, is provided by a plurality of pairs of oppositely-poled voltage-sensitive threshold conduction devices which are selectively connected so as to be controllably inserted between a source of operating voltage and the dc motor. In a preferred embodiment of the invention, the voltage-sensitive threshold conduction devices advantageously comprise a series connection of diode bridges which are sequentially included in the energizing path of the motor.Furthermore, the controller provides a speed sensitive brake function by controllably connecting at least one voltage-sensitive threshold conduction device across the windings of the dc motor. When so connected, this allows the voltage generated by the spinning motor to cause the voltage-sensitive threshold conduction device to be conductive until the motor speed slows to the point that the generated voltage no longer causes the device to conduct. Thereafter, the motor is effectively "open circuited" and therefore allowed to rotate freely.
Abstract:
An improved triggering switch for DC motors having a base support, a pressing member operatively mounted over the base support, a coupling stand with an open section installed in an upper portion of the base support, a set of motor terminals and power source terminals combined with a contact shaft respectively disposed in the open section of the coupling stand, and a selection button adjustably installed at the base support and movably connected to the contact shaft. The improvement includes a braking member having an elongated terminal connected to a negative terminal of the motor terminals and a C-shaped contact portion formed at a rear end thereof fixedly disposed around the motor and the power source terminals in the open section of the coupling stand with the C-shaped contact portion being positioned in line with a rear end of a positive terminal of the motor terminals; thereby, when the contact shaft is moved back with the power source being cut off, the C-shaped contact portion and the positive terminal of the motor terminals will be connected by the contact shaft to short-circuit the motor and immediately stop it.
Abstract:
A food mixer having speed control means including a first switch having a series of speed positions and a switch lever movable in the mixer handle forwardly and rearwardly thereof and a second momentary switch adapted when actuated to provide an increase in speed and torque in any speed position of the first switch with the second switch lever being pivotally mounted on the mixer handle for convenient actuation independently of the first switch lever.