Kabushiki Kaisha Toyota Jidoshokki

Kabushiki Kaisha Toyoda Jidoshokki Seisakusho

Toyota Jidosha Kabushiki Kaisha

Tatsuya Uematsu

Masaki Takasan

Norimoto Minoshima

Yoshikazu Koike

Isao Watanabe

Eiji Yamada

Takaji Umeno

Makoto Ito

Hideo Nakai

Kazutaka Tatematsu

Tadashi Kondo

Toshihiko Yoshida

Kosuke Aiki

Kazuyoshi Takeuchi

Kenji Endo

Richard Gibson Hoft

In a rotating electrical machine, when a stator winding is wound in concentrated winding, an improvement in performance is achieved by reducing a magnetomotive force harmonic without reducing a fundamental wave magnetic flux generated by a stator. A rotating electrical machine () includes a rotor (), and two stators () opposed with the rotor () being interposed therebetween either on both sides of the rotor () in the axial direction or on both sides of the rotor () in the radial direction. Stator windings () provided in a plurality of portions in the circumferential direction of each stator () are wound in concentrated winding. The directions of magnetic fluxes generated by stator windings () having the same phase in the stators () are in mutually opposite directions with respect to either the axial direction or the radial direction. The stator windings () having the same phase in the stators () are arranged to be shifted from each other by 180 degrees in electrical angle in the circumferential direction.

Rotating electrical machine

A vibrating transducer is coupled to one end of an elongated vibrating plate and a receiving transducer is coupled to the other end of the vibrating plate. Langevin transducers are used for the vibrating and receiving transducers. Each transducer includes a pair of annular piezoelectric elements. The vibrating transducer is connected to an oscillator. A controller controls the oscillator. Detection signals of a voltage sensor, which detects the vibrating state of the receiving side of the vibrating plate, are fed back to the controller. The controller controls the oscillator such that the phase difference between the vibration of the vibrating side and the receiving side is within a predetermined range and that the receiving side is vibrated by amplitude greater than or equal to a predetermined amplitude.

Driving unit for transducer

An apparatus for levitating objects has an elongated diaphragm and a transducer. The diaphragm has a first end portion and a second end portion. The first end portion is fixed to a horn and the second end portion is fixed to a supporting member. The transducer is connected to only the horn. The transducer vibrates the diaphragm and an object is levitated above a surface of the diaphragm by radiation pressure of a sound wave generated from the diaphragm. Therefore, the elongated diaphragm can be vibrated by one transducer in a stable condition with a simple structure.

Apparatus for levitating objects and apparatus for transporting objects

When a mobile unit moves with a motor driven by electric power supplied by a power supply line without a contact when the mobile unit moves where the power supply line exists. The electric power supplied without a contact is also used in charging a electric double layer capacitor. Since the charging current is limited by limiting resistance, the motor can be supplied with sufficient power although the electric double layer capacitor is in a vacant (completely discharged) state.

Power supply circuit of mobile unit supplied with power without contact, and mobile unit

Hall ICs and are provided to detect the magnetic fields of magnetic regions of a rotor and are offset in position by an electrical angle of 30&deg; from central positions of a U-phase stator pole , V-phase stator pole and W-phase stator pole . A driving circuit controls the timing of rotor driving signals that are supplied to respective stator coils for respective phases based upon rotor position signals outputted from the Hall ICs through For example, in order to rotate the rotor in a forward direction, the driving circuit controls the timing of the rotor driving signals according to a first logic. Similarly, in order to rotate the rotor in a reverse direction, the driving circuit controls the timing of the rotor driving signals according to a second logic. A delay circuit may delay the rotor position signals outputted from a position detector by delay time according to the rotating speed of the reluctance motor so as to supply delayed signals to the driving circuit

Synchronous motors and control circuits therefor

An inductor-capacitor series resonant circuit is connected in series with a thyristor or other unidirectionally conductive semiconductor switch to form a resonant network, one resonant network for each stator phase winding of a switched reluctance motor to be connected in parallel to the stator phase winding. Zero current switching is achieved by selecting the resonant frequency such that the inductor and capacitor resonate in a time period during both turn-on and turn-off of the semiconductor switches. A C-dump circuit is included in one embodiment for increased power transfer efficiency.

Resonant power electronic control of switched reluctance motor

A power feeding device of three-leg core type having a primary and secondary cores which appear to be a three-leg core cut into two pieces at the legs and form a magnetic circuit including gaps by being coupled to face the cut surfaces, and a primary and secondary windings wound coaxially around the central leg section, with the primary core and primary winding constituting the power supply part and the secondary core and secondary winding constituting the power receiving part. The power feeding device based on this winding structure achieves a far better power transfer efficiency as compared with the conventional counterpart having the primary and secondary windings wound separately on a pair of E-shape cores.

Growing community of inventors

Kariya, Japan

Tatsuya Uematsu