Hitachi, Ltd.

Hitachi Car Engineering Co., Ltd.

Houng Joong Kim

Kohji Maki

Hitoshi Shibata

Hisao Tadokoro

Hideki Shimane

Keijiro Sakai

Yasuo Morooka

Keiichi Mashino

Keijirou Sakai

Takashi Kobayashi

Ryoso Masaki

Yoshitaka Iwaji

Toshiyuki Innami

Toshiaki Okuyama

Kazuo Tahara

Tsunehiro Endo

Hiroshi Katayama

Hiromi Inaba

Noriaki Yamamoto

Shigeta Ueda

Hisaya Shimizu

Yasuo Notohara

Shigeru Shinohara

Takeo Morimoto

Yoshimi Sakurai

Kou Ajima

Isamu Numata

Yasunori Sannohe

Hiroshi Ueno

Daisuke Sato

The conventional linear drive apparatus has the problem that in constructing a linear motor of a multiphase structure by connecting a plurality of armature units, the length of the armature becomes longer in proportion to the number of the phases, thus limiting the locations where the apparatus can be installed. The problem is solved by a linear drive apparatus comprising a plurality of armature unitsformed by a magnetic material on which a conductor coilis disposed, and an armature comprising an arrangement of the armature units. The armature unitscomprise a plurality of opposing portions having opposing magnetic pole teeth. The magnetic pole teeth of adjacent opposing portions are arranged in an interdigitated manner. A secondary memberis disposed between magnetic pole teeth of the opposing portions. The armature unitscomprise the coilarranged on opposite sides thereof in an alternating manner.

Linear drive apparatus having cores and coils which are positioned on opposite sides of the cores

A linear motor for generating a linear motion in a linear direction, has a plurality of first members, each of which includes an electromagnetic coil for generating a first magnetic field, and a magnetic core (magnetically permeable) having magnetic surfaces being opposite to each other so that the first magnetic field passes a space between the magnetic surfaces, and a second member arranged in the spaces to be relatively movable linearly with respect to a combination of the first members to generate the linear motion in the linear direction, and including a magnet polarized in a polarizing direction to generate a second magnetic field.

Linear motor and X-Y stage

In order to reduce load supported by a support mechanism for supporting a movable part so as to prevent the movable part from moving in a horizontal direction when stress is generated thereon in the horizontal direction, there is provided a drive unit including a primary side having a magnetic body around which a coil is wound, and a secondary side having a plurality of permanent magnets, the primary side including magnetic poles and step portions provided on the magnetic poles. The width of each step portion is smaller than the width of each permanent magnet.

Linear drive unit reducing stress generated in movable part in horizontal direction

Linear drive apparatus

In a rotary electric machine capable of improving the reliability of an object provided with the same, a permanent magnet type synchronous rotary electric machine comprises has a stator provided with windings. A rotor arranged supported for rotation in the stator with a gap between the inner surface of the stator and the outer surface thereof, is divided into two rotor bodies each provided with permanent magnets of opposite polarities alternately arranged in a circumferential direction. In switching the permanent magnet type synchronous rotary electric machine from a motor to a generator, a second rotor body is moved axially relative to a first rotor body to an axial position that makes the intensity of a combined magnetic field created by the permanent magnets lower than that of a combined magnetic field created by the permanent magnets when the second rotor body is located at a predetermined position, and then the second rotor body is moved to the predetermined position.

Rotary electric machine and automobile provided with the same

A drive apparatus overcomes the problems of ensuring accurate mounting of a plurality of armature coils relative to a plurality of magnetic pole position detectors, limitations concerning the location for mounting, and the extension of primary-side length. The drive apparatus comprises a primary side including an arrangement of a plurality of armatures each having a core made of a magnetic material with coil windings. It also comprises a secondary side including a permanent magnet movably supported relative to the armatures via a gap. A magnetic pole position detector is disposed between adjacent armatures.

Drive apparatus and XY table utilizing the same

To reduce the magnetic flux leakage through the gap between magnetic pole teeth of an armature so as to reduce the magnetic attraction force generated between the armature and a needle, an armature unit is provided with two magnetic polesand, on the top of which are magnetic pole teeth, andprotruding toward the opposing magnetic pole, where the magnetic pole teeth of the magnetic poleare arranged at two heights, upper and lower, and the magnetic pole teeth of the opposing magnetic poleare arranged at two heights, upper and lower, so that the magnetic flux flows upward and downward alternately between the upper and lower magnetic pole teeth. The needleequipped with permanent magnets moves relatively in the gapbetween the upper and lower magnetic pole surfaces of the armature unit.

Linear motor and manufacturing method thereof

The present invention is characterized by a hybrid car comprising a motor generator mechanically connected with the crank shaft of an internal combustion engine for driving a car wherein the internal combustion engine is started by electric power supplied by a battery and power is generated by rotation from the internal combustion engine to charge the battery, an inverter for controlling the drive and power generation of the motor generator, and a control circuit for controlling the inverter, this hybrid car further characterized in that the motor generator is driven by battery power to start the internal combustion engine, and after the internal combustion engine has started, the battery is charged by the generator mode operation of the motor generator using the power of the internal combustion engine, wherein a step-down chopper circuit is provided between the battery and the inverter, and step-down control is provided to ensure that the power generation voltage will reach the level of the battery charging voltage through the step-down chopper circuit.

Dynamotor of hybrid vehicle, and method of control thereof

Disclosed herewith a compact linear motor provided with a plurality of magnetic pole teeth and used to increase the thrust force by canceling a magnetic attractive force working between the primary member and the secondary member. The linear motor comprises a primary member and a secondary member. The primary member includes cores formed with a magnetic material and an electromagnetic coil wound on the cores while the secondary member supported so as to be capable of moving relatively with respect to the primary member with a gap therebetween. In the linear motor, the coil that is wound commonly on the cores is also disposed between adjacent magnetic pole teeth.

Linear motor, its controlling method, and XY table

A machine tool provided with an electric motor which can maintain the fixed output power in a wide speed range. The electric motor has a stator having a primary winding, and a rotor having a field magnet and a shaft, said field magnet comprising a first field magnet having different polarity magnetic poles sequentially arranged in a rotating direction and a second field magnet having different polarity magnetic poles sequentially arranged in a rotating direction, and a mechanism for shifting one field magnet in axial and rotating directions with respect to the other field magnet, whereby a composite magnetic field of said first and said second field magnets is changed.

Machine tool

One slot arranged between two slots containing a first armature winding contains a second armature winding for a phase different from a phase of the first armature winding; one slot arranged between the two slots containing the first armature winding contains a third armature winding for a phase equal to the phase of the second armature winding; and, one of the second armature winding and the third armature winding is arranged in a coil end portion in an outer peripheral side of the first armature winding, and the other is arranged in an inner peripheral side of the armature winding. With this, the projected height of the coil end portion of the stator can be reduced.

Rotary electric machine, linear motor and stator thereof

The present invention provides an electric rotary machine including a rotor having a field magnet provided on a shaft, the field magnet having magnetic poles of sequentially different polarities arranged in a rotational direction, a second field magnet with magnetic poles of sequentially different polarities arranged in a rotational direction wherein the second field magnet is rotatable on the shaft and displaced axially with respect to the first field magnet.

Electric rotary machine and power generation systems using the same

A linear motor has an armature; a moving member movable relatively to the armature; first and second magnetic pole tooth trains each having magnetic pole teeth magnetically coupled to one of two magnetic poles of the moving element, the first and second magnetic pole tooth trains being separated from each other in a direction substantially perpendicular to a moving direction of the moving member; and third and fourth magnetic pole tooth trains each having magnetic pole teeth magnetically coupled to the other of the two magnetic poles of the moving element, the third and fourth magnetic pole tooth trains being separated from each other in a direction substantially perpendicular to a moving direction of the moving member and the moving member being arranged between the first and second magnetic pole tooth trains and the third and fourth magnetic pole tooth trains.

Linear motor

A power tool has a linear motor which includes a movable element having a tool mounted on its one end and having magnotic poles installed at a fixed pitch along the direction of movement, magnetic pole teeth installed in opposition to each other and at a fixed pitch along the direction of movement in a longitudinal direction of the movable element, and a coil for exciting the magnetic pole teeth so that the adjacent magnetic pole teeth and opposed magnetic pole teeth act and different poles, respectively. The power tool further has a control circuit for reciprocating the movable element by exciting the coil, thereby to work on a workpiece by using the tool in the process of this reciprocating movement.

Power tool with a linear motor

With an electric motor formed according to a prior art, there is a relatively large amount of magnetic flux leaking between an armature and a secondary, resulting in a problem that an electric current is large but a desired output is small. In addition, since a magnetic attraction acts only in one direction between the armature and the secondary, there is a relatively large load on the support structures of the secondary, causing a distortion in the motor structure and some other disadvantages. In order to solve the above problems, the present invention provides an improved electric motor comprising an armature having a core formed by a magnetic material and having a coil wound around the core; and a secondary disposed within the armature with a clearance formed therebetween and supported to be relatively movable with respect to the armature.

Growing community of inventors

Hitachi, Japan

Houng Joong Kim