Abstract:
A method of removing a stator coil (10) from a stator core (12) of an electrical generator, including vibrating an unbonded portion (50) of the coil (10) until a resin bond material (32) between a bonded portion of the coil (46) and a surface (34) of the core (12) fails due to high cycle fatigue to free the coil (10) from the core (12).
Abstract:
An apparatus for controlling a vibration includes a vibration transfer unit; at least one pair of oscillators disposed spaced apart from each other in the vibration transfer unit, and configured to generate a vibration in the vibration transfer unit; at least one driver configured to selectively drive the at least one pair of oscillators; and a controller configured to control the at least one driver and thereby move a center of the vibration within the vibration transfer unit so as to create a moving vibration sensation.
Abstract:
Schaltungsanordnung (1) zur Auswertung und/oder zur Ansteuerung von Schallwandlern (2, 22) für die Anwendung in Fahrzeugen insbesondere als Teil einer Einparkhilfe, wobei die Schaltungsanordnung (1) einen Transformator (12, 23) mit einer Primärwicklung (7, 8) und einer Sekundärwicklung (16) umfasst und die Wicklungen zu einem Übersetzungsverhältnis (ü) von größer 1 führen, wobei an der Sekundärwicklung (16) Anschlüsse für einen Schallwandler (2, 22) vorgesehen sind und wobei an der Primärwicklung Anschlüsse (7, 8) für Ansteuermittel vorgesehen sind, die an der Primärwicklung (7, 8) des Transformators (12, 23) eine zeitlich sich ändernde Spannung erzeugen, wobei auf Seiten der Primärwicklung (Primärseite) (7, 8) eine Antenne (20, 36) vorgesehen ist, die zum Empfang von durch Störsignale erzeugter elektrischer Felder geeignet ist und die über einen Koppelpfad (21, 37) mit der Seite der Sekundärwicklung (16) (Sekundärseite) verbunden ist, wobei im Koppelpfad (21, 37) ein Mittel zur Phasenverschiebung vorgesehen ist, das eine Phasenverschiebung der von der Antenne (20, 36) empfangenen elektrischen Störsignale um 180° bewirkt.
Abstract:
The present invention is directed to a high-powered (e.g., > 500 W) ultrasonic generator for use especially for delivering high-power ultrasonic energy to a varying load including compressible fluids. The generator includes a variable frequency triangular waveform generator coupled with pulse width modulators. The output from the pulse width modulator is coupled with the gates of an Isolated Gate Bipolar Transistor (IGBT), which amplifies the signal and delivers it to a coil that is used to drive a magnetostrictive transducer. In one embodiment, high voltage of 0-600VDC is delivered across the collector and emitter of the IGBT after the signal is delivered. The output of the IGBT is a square waveform with a voltage of +/- 600V. This voltage is sent to a coil wound around the ultrasonic transducer. The voltage creates a magnetic field on the transducer and the magnetorestrictive properties of the transducer cause the transducer to vibrate as a result of the magnetic field. The use of the IGBT as the amplifying device obviates the need for a Silicon Controlled Rectifier (SCR) circuit, which is typically used in low powered ultrasonic transducers, and which would get overheated and fail in such a high-powered and load-varying application.
Abstract:
A mobile terminal with an electromagnetic actuator for generating speech, buzzing sound, or low-frequency vibration. The mobile terminal generates little abnormal sound. In this electromagnetic actuator, the terminal lugs are short-circuited, the terminal lugs are electrically connected to amplifiers, or an amplifier is electrically connected to a signal generator for generating a constant-voltage signal or a constant-frequency signal. In such a way, the abnormal sound caused by the vibration of a mechanical vibration system of the actuator is reduced.
Abstract:
A vibration system is excited in operation by a vibrator (6) which is driven by an electric current. The vibrator (6) comprises a stationary electromagnet (8) and an oscillatorily suspended armature (10) as well as a vibration regulation circuit for adjusting the oscillation amplitude of the armature (10). The vibrator regulation circuit (13) is adapted to successively regulate this amplitude upwards. The system moreover includes an accelerometer (17) for detecting the size of the momentary acceleration of the system. The accelerometer (17) applies a voltage signal in response to the detected acceleration, said voltage signal ordering the vibrator regulation circuit (13) via an auxiliary circuit (16) to regulate the amplitude of the armature (10) downwards upon a bottom stroke.
Abstract:
PROBLEM TO BE SOLVED: To provide a vibrating device or the like, which allows an object including dust to be moved efficiently in a predetermined direction through vibration. SOLUTION: The vibrating device is equipped with: a vibrator having a plurality of electromechanical energy conversion elements; a power source for applying an AC voltage to the plurality of electromechanical energy conversion elements; and a control circuit for controlling the AC voltage to be applied by the power source. The control circuit causes the vibrator to generate, with a predetermined time phase difference, a first standing wave and a second standing wave of different degrees wherein a plurality of nodal lines are disposed side by side in the same direction. The vibrator has at least one of the electromechanical energy conversion elements disposed in the same direction as the nodal lines, and has at least one of the electromechanical energy conversion elements disposed in a direction where the nodal lines are arranged side by side. COPYRIGHT: (C)2011,JPO&INPIT