Mitsubishi Denki Kabushiki Kaisha

Toshiba Mitsubishi-electric Industrial Systems Corporation

Kanazawa Institute of Technology

Mitsuhiro Kawamura

Toshihiro Tsuda

Tadashi Fukami

Kazuo Shima

Akira Yamada

Masatsugu Nakano

Haruyuki Kometani

Yuji Ikeda

Syo Imayoshi

Wataru Bitoh

Kazuki Noda

Shower head

This rotating electric machine has a rotor, stator core, field windings for multiple poles, and armature windings for the multiple poles. The rotor is rotatably supported about a shaft. Convex-shaped multiple salient pole sections are formed on the outer circumference of the rotor while arranged in the circumferential direction. The stator core is provided along the outer circumference of the rotor with an air gap from the rotor. Convex-shaped multiple teeth are formed on the inner circumference of the stator core while arranged in the circumferential direction. The field windings for the multiple poles are wound around each of the multiple teeth while insulated from the field windings.

Rotating electric machine

This rotating electrical machine has a rotor, stator core, field windings for multiple poles, and armature windings for the multiple poles. The rotor is rotatably supported about a shaft. Convex-shaped multiple salient pole sections are formed on the outer circumference of the rotor while arranged in the circumferential direction. The stator core is provided along the outer circumference of the rotor with an air gap from the rotor. Convex-shaped multiple teeth are formed on the inner circumference of the stator core while arranged in the circumferential direction. The field windings for the multiple poles are wound around each of the multiple teeth while insulated from the field windings.

Rotating electrical machine

A field control device for a synchronous rotating machine includes: a target operating condition input unit; a first subtraction unit; a final-control-quantity control computation unit that accepts the final-control-quantity deviation and outputs a field-current correction demand value; an anticipatory computation unit that outputs a field-current anticipatory demand value based on the operating condition demand values input; an addition unit that adds the field-current correction demand value and the field-current anticipatory demand value; a second subtraction unit; and a field-current regulation device that adjusts the field current based on the field current deviation. The anticipatory computation unit includes: a dependence characteristic data storage unit that stores dependence characteristics predicted on the basis of the results of a no-load test; and a circuit calculation unit that performs a circuit calculation by using the dependence characteristics and outputs a field-current anticipatory demand value.

Field control device, method of field control, and synchronous rotating machine

A dynamo electric machine includes a rotor having magnetic poles with permanent magnets and a stator having armature windings concentratedly wound around teeth. When the number of pole pairs of the magnetic poles of the rotor is P, diameter of the rotor is D (meters), and a spatial harmonic order of a predetermined harmonic component of an armature magnetomotive force of the rotor is N ((N=P to the 1.5power)&#xd7;(N to the minus 4-th power)&#xd7;(the square of P)&#xd7;D&#x3c;0.6 (in meters).

Permanent magnet dynamo electric machine, and permanent magnet synchronous generator for wind power generation

Unsaturated inductances of an equivalent circuit of a synchronous machine are measured from the following steps: An armature resistance of a synchronous machine is measured. A time constant of an armature with damper under a quadrature-axis magnetomotive force is measured when an armature and a field are in a positional relationship wherein a magnetomotive force by flowing current to an armature coil of the synchronous machine becomes the quadrature-axis magnetomotive force. Also, a current and a voltage of the armature are measured when the armature and the field are in the positional relationship by a quadrature-axis Dalton-Cameron method. The measured values are then used for solving equations defining inductances of a quadrature-axis equivalent circuit of the synchronous machine.

Method of measuring unsaturated inductances of an equivalent circuit of

An apparatus for measuring the electrical time constant of the quadrature-axis damper of a synchronous machine is designed such that a voltage from a d.c. power source is applied by switching to armature windings of two. phases, so that an armature current rises and thereafter maintains a constant value. A current induced on a quadrature-axis damper diminishes at a rate determined by the quadrature-axis damper time constant, and this decreasing current and the constant armature current flow inside the synchronous machine to produce a constant resistance drop by resistance of the armature windings and the armature current. In this time, the length of time length until the voltage waveform falls to a prescribed level is measured as the time constant of the quadrature-axis damper with such a measuring device as an electromagnetic oscilloscope.

Apparatus for measuring the electrical time constant of the

A method of measuring unsaturated inductances of an equivalent circuit of a synchronous machine including measuring a no-load saturation characteristic of a synchronous machine; measuring a three-phase short-circuit characteristic of the synchronous machine; measuring currents and voltages of an armature and a field when an armature coil and a field coil are in a positional relationship wherein a magnetomotive force by flowing current to the armature coil of the synchronous machine becomes a direct-axis magnetomotive force and both when the field coil is in an open-circuit state and when the field coil is in a short-circuit state by direct-axis Dalton-Cameron method; and solving simultaneous equations concerning a direct-axis equivalent circuit of the synchronous machine by using results of the measuring the no-load saturation characteristic, the measuring the three-phase short-circuit characteristic and the measuring by the direct-axis Dalton-Cameron method, thereby obtaining impedances of respective elements constituting the direct-axis equivalent circuit.

A heat resistant and explosion-proof permanent magnetic synchronous motor having a stator which includes an armature iron core made by piling up steel plates with surface covered with a mineral insulation material and disposed on an inner peripheral surface of a pressure case, an armature coil made by winding a wire covered with a mineral insulation material around a slot of the armature iron core, a can hermetically sealing the armature iron core, a back-up sleeve supporting the can at a portion where the armature iron core is not provided, and a slot piece of a mineral insulation material supporting the can at an opening portion of the slot. The motor also includes a rotor including a magnetic yoke connected to an outer peripheral surface of an actuating shaft provided to penetrate the pressure case and rotatably supported thereon, a plurality of rotor magnetic poles disposed on an outer peripheral surface of the magnetic yoke, and a non-metallic case covering an outer peripheral surface of the rotor magnetic pole.

Heat resistant and explosion-proof type permanent magnetic synchronous

An apparatus for measuring the time constant of the direct-axis damper of a synchronous machine is designed such that a voltage from a d.c. power source is applied by switching to armature windings of two phases, so that an armature current rises and thereafter it keeps a constant value. A current induced on a direct-axis damper diminishes at a moderate rate of the direct-axis damper time constant, and this decreasing current and the constant armature current flow inside the synchronous machine. In response to a change in the induction current on the direct-axis damper caused by the transition of the armature current to the steady state, a voltage induced on the field winding rises sharply and then falls gradually. The time length until the field winding voltage falls to a prescribed level is measured as the time constant of the direct-axis damper with such a measuring device as an electromagnetic oscilloscope.

Apparatus for measuring the time constant of the direct-axis damper of a

A linear motor having phase armature windings which are not completely contained within a partial space of an iron core of the linear motor. The phase armature windings consist of a phase armature winding which is entirely contained within the partial space and positioned at the ends of the partial space with respect to the travelling direction of the magnetic field produced by the linear motor and of other phase armature windings which are not completely contained within the partial space. The number of the turns of the former phase armature winding is arranged to be larger than the summed number of turns of the latter phase armature windings. The former phase armature winding may be a concentric winding while the latter phase armature windings are body-belt-like windings.

Growing community of inventors

Tokyo, Japan

Mitsuhiro Kawamura