Nissan Motor Company Limited

Fuji Electric Co., Ltd.

Shinichiro Kitada

Toshio Kikuchi

Yutaro Kaneko

Takashi Tsuneyoshi

Noboru Hattori

Shunichi Aoyama

Isaya Matsuo

Takeshi Aso

Hiroyuki Hirano

Munekatsu Shimada

Eiji Inada

Ryuichi Idoguchi

Yu Owada

Makoto Kano

Masaaki Uchida

Hideaki Ono

Yasuhiko Kitajima

Shigenori Kinoshita

Takao Yanase

Tetsurou Tayu

Koetsu Fujita

Kimihiro Shibata

Mitsuo Uchiyama

Toshimitsu Matsuoka

Naoshi Sakata

Keiji Okushima

Masahiko Hanazawa

Tomoharu Nakayama

A cooling structure and a rotating electric machine with the cooling structure are provided. The cooling structure produces sufficient reductions in the temperature of the stator core while at the same time not causing a large reduction in the output of the rotating electric machine. The rotating electric machine is provided with a first cooling medium passage formed in the slot. In addition, a second cooling medium passage is provided which extends in parallel to the first cooling medium passage and allows flow of the same cooling medium as the first cooling medium passage. The stator core comprises at least a section of the passage wall of the second cooling medium passage. The second cooling medium passage is disposed so that the second cooling medium passage does not impede the flow of magnetic flux in the stator core.

Rotating electric machine and cooling structure for rotating electric machine

An electrical-steel-sheet formed body is provided with an opening portion into which a permanent magnet is inserted, and an outer-peripheral hardened portion formed on the electrical-steel-sheet formed body at an outer periphery side thereof for the opening portion and having a higher hardness than a remaining area of the electrical-steel-sheet formed body. The electrical-steel-sheet formed body can be used as the rotor of the built-in permanent magnet type rotary electric machine, and the built-in permanent magnet type rotary electric machine can be obtained.

Electrical-steel-sheet formed body for rotor core, rotor, rotary electric machine and related method

A motor/generator () comprises a permanent magnets () having a V-shaped surface projecting in the center of a rotor (). These permanent magnets () are disposed so that the V-shaped surface faces the center of the rotor (). In this way, the permanent magnets () are prevented from sliding on the fitting surfaces () of the insertion holes (), and the permanent magnets () can be fixed at predetermined positions. Further, magnetic losses caused by the rotor () can be reduced, and efficiency of the motor/generator can be improved.

Permanent magnet motor/generator

A hybrid vehicle is provided that lowers the cost of series hybrid vehicles in order to make it easier for series hybrid vehicles to gain popularity. A hybrid vehicle equipped with an engine, a first rotary electric machine and a second rotary electric machine. The first rotary electric machine is coupled to the output shaft of the engine, while the second rotary electric machine is electrically coupled to the first rotary electric machine and coupled to the drive wheels of the vehicle. The maximum generated electric power of the first rotary electric machine is substantially equal to the maximum output power of the second rotary electric machine.

Hybrid vehicle

A stator for a rotary electric machine is provided to curb decreases in output caused by magnetic flux leakage. The stator has a stator core with stator coils that are wound around tooth parts of the stator core. The tooth parts of the stator core are arranged to form a rotational space with respect to a rotor, and housed inside the slots and cooling medium passages are formed inside the slots by blocking the openings of the slots. The protrusions are provided that protrude into the slots from both lateral surfaces of the tips of the tooth parts. The plates formed with grooves on both sides thereof that fit on the tips of the protrusions are arranged between adjacent ones of the protrusions so as to block the openings of the slots. A sealing member is formed on the rotor side of the plates.

Stator structure for rotary electric machine

A rotating electric machine using an inner section of a slot of a stator as a cooling passage obtains highly effective cooling performance with a small amount of cooling medium. An opening for a slot in a stator is closed by an under plate having a closing member. A regulating plate is disposed which is a member for regulating the cross-sectional area of the passage in substantially a central section of the slot. In this manner, the cross-sectional area of the cooling passage with the plate in the slot is smaller than the cross-sectional area when the regulating plate is not provided by an area corresponding to the cross-sectional area of the regulating plate. This arrangement allows increases in cooling efficiency.

Rotating electric machine

A motor or a generator which has permanent magnets on a moveable member effectively reduces eddy current loss in the permanent magnets. A permanent magnet which is provided for the moveable member of a motor or a generator, for example the rotor of a rotating motor, is divided into magnet sections ( A- E) having divided widths (t -t ) in response to the rate of change in the flux density in each divided magnet. Thus the eddy current loss in each magnet section ( A- E) can be substantially equalized.

Motor or generator

This invention provides a rotating electric machine using an inner section of a slot of a stator as a cooling passage and allowing a high cooling efficiency. Furthermore, it provides a manufacture method for the rotating electric machine which allows streamlining of the manufacture of the cooling passage. A plate is attached to the plate retaining groove formed in proximity to the opening of the slot of the stator. A resin layer is formed by injection of resin into a space formed between the outer face of the plate and the mold set on an inner peripheral face of the stator. The plate is pressed by the injection pressure of the resin to come into close contact with the stopper and to create a seal which prevents leakage of resin into the slot. A leg is provided on the plate and extends into the slot for reducing the cross sectional surface area of the cooling passage.

Rotating electric machine and method of manufacture therefor

A stator structure is provided with a stator core having a plurality of cooling passages or slots and an annular resin layer formed on an inner peripheral surface of the stator core that defines a rotor receiving opening. The stator core has a plurality of protrusions disposed on the inner peripheral surface of the stator core to control the depth of the annular resin layer formed on the inner peripheral surface of the stator core. The protrusions have radial thicknesses that are substantially equal to the radial thickness of the annular resin layer.

An annular member is fitted to the outer periphery of the stator cores in a rotating electric machine. The rotating electric machine has a cooling passage in an axial direction between a resin molded section and adjacent stator cores The annular member is formed from a material which has a larger coefficient of linear expansion than the magnetic material comprising the stator cores. At low temperatures, stress resulting from the differential between the coefficient of linear expansion of the stator core and the resin molded section is reduced because an inward compressive force is applied to the stator core by the annular member as a result of the difference in the coefficient of linear expansion.

A rotor ( ) of a motor is fixed to a rotation shaft ( ) and a stator ( ) is disposed on the outer side. The stator ( ) is provided with a plurality of slots ( ) opening towards an outer periphery of the rotor ( ). The openings of each slot ( ) facing the outer periphery of the rotor ( ) is closed by a cover ( ). A first cooling liquid chamber ( ) is formed facing the opening of the slots ( ) on one end face of the stator ( ). A second cooling liquid chamber ( ) is formed facing the opening of the slots ( ) on another end face of the stator ( ). A supply port ( ) of cooling liquid is provided in the first cooling chamber ( ) and cooling liquid supplied from the supply port ( ) to the first cooling liquid chamber ( ) flows into the second cooling liquid chamber ( ) through the slots ( ). Coils ( ) disposed on each slot ( ) are efficiently and evenly cooled by the provision of members ( A, B, ) that evenly distribute cooling liquid supplied from the supply port ( ) to the respective slots ( ).

Motor/generator with equalized coolant distribution

This invention prevents leakage of cooling medium from a cooling passage in the interior section of a slot of a stator. Coils are housed in the slot of the stator core. The openings of the slot are covered in order to form a cooling passage in the slot. An end plate is disposed on the end of the stator. The stator core and the end plate are integrated by winding coils through the outer side of the end plate. A cylindrical member which projects along the inner peripheral face of the stator from the end of the stator is formed by resin molding to be integrated with a section of the end plate. A ring-shaped space which introduces cooling medium is formed on an outer peripheral side of the cylindrical member and is connected with the cooling passage.

Rotating electrical machine

A controller for motor/generators is proposed which allows reductions in ripple current generated by an inverter driving a power-generating motor/generator and a vehicle-driving motor/generator. The control device for motor/generators has a first inverter which supplies a control current to a first motor/generator used mainly as an electrical motor, a second inverter which supplies a control current to a second motor/generator used mainly as a generator, a first PWM signal generating circuit which drives the switching elements of the first inverter based on a first carrier signal, a second PWM signal generating circuit which drives the switching elements of the second inverter based on a second carrier signal which has the same period of the first carrier signal. The first inverter and the second inverter are controlled so that the operation of the first inverter is synchronized with the operation of the second inverter and the current of the first inverter which flows in the DC bus line is generated in opposite direction to the current of the second inverter which flows in the DC bus line.

Control device for motor/generators

An engine is activated to drive a generator when an electrical output is required. The required electrical output (PO) is searched and the necessary engine output is calculated. The basic driving point (NO, TO) which obtains maximum fuel efficiency is set at that output (S S ). The load of the generator is controlled so as to reach the set basic driving point. When the catalyst temperature is lower than a set value, while maintaining the required electrical output, the basic driving point is varied to a driving point (Ncold, Tcold) which will raise the exhaust gas temperature (S ). Furthermore when the temperature of the peripheral engine components in the engine room is higher than a set value, while maintaining the required electrical output, the driving point is varied to a driving point (Nheat, Theat) which will lower the exhaust gas temperature (S S ). Hence while maintaining the electrical output, it is possible satisfy each component temperature condition. Therefore while maintaining drivability, fuel efficiency performance, lowering exhaust gas emissions and component deterioration can suppressed.

Generator control device for an electrical automobile

A rotating electrical machine is proposed which effectively cools a stator and prevents the generation of an eddy current in the stator. A cooling liquid passage extends in a direction parallel with the rotating shaft of the rotor between an outer peripheral face of the stator cores and an inner peripheral face of the case storing the stator cores. The cooling liquid is passed through the cooling liquid passage. In this manner, a highly effective cooling results from direct contact of the cooling liquid and the stator cores. Furthermore an eddy current is not generated in the stator core as a result of using a cooling liquid having insulating properties.

Growing community of inventors

Tokyo, Japan

Shinichiro Kitada