Matsushita Electric Industrial Co., Ltd.

Naoyuki Kadoya

Yasuhiro Kondo

Hiroshi Murakami

Yoshinari Asano

Masaki Tagome

Yukio Honda

Masayuki Shinto

Hiroshi Ito

Satoshi Tamaki

Kazushige Narazaki

Shizuka Yokote

Hiroshi Itoh

Takeshi Morishige

A motor includes a rotor including a permanent magnet type rotor unit having a plurality of permanent magnets and a reluctance type rotor unit having a plurality of salient pole portions, the rotor units being coupled to each other in an axial direction. A stator generates a field for driving the rotor. The permanent magnet type rotor unit and the reluctance type rotor unit have an angular deviation therebetween in the direction of rotation to obtain desired torque characteristics. The reluctance type rotor unit has slits for preventing flux leakage from the permanent magnets. The slits are formed with the angular deviation in the direction of rotation from respective positions symmetric about a center of the salient pole portions. Flux leakage is thus prevented to avoid deterioration in characteristics.

Motor

In a permanent magnet-embedded, concentrated winding motor, plurality of stator teeth are divided into, for example, three groups that include a plurality of adjacent stator teeth having coils wound around and that are provided with voltage in phase that are set as one group. Coils are wound in opposite directions around adjacent stator teeth in the same group, while the relation between the angle h of a slot opening between adjacent stator teeth of the same group and the angle H of a slot opening formed between adjacent stator teeth of different groups satisfies h&#x3c;H&#x2266;3h.

A motor including: a rotor including a permanent magnet type rotor unit having a plurality of permanent magnets and a reluctance type rotor unit having a plurality of salient pole portions, the rotor units being coupled to each other in an axial direction; and a stator for generating a field for driving the rotor. The permanent magnet type rotor unit and the reluctance type rotor unit are given an angle deviation therebetween in the direction of rotation to obtain desired torque characteristics. The reluctance type rotor unit has slits for preventing flux leakage from the permanent magnets. The slits are formed with the angle deviation in the direction of rotation from respective positions symmetric about a center of the salient pole portions. Flux leakage is thus prevented to avoid deterioration in characteristics.

A permanent magnet embedded type concentrated winding motor generator, wherein of the mechanically and electrically independent first and second winding groups (), the plurality of first teeth () wound with the first winding groups () are divided into three groups (I, II, III) for example, and the winding directions of the windings of adjacent first teeth () within the same group (I, II, III) are opposite. Furthermore, one second tooth () wound with a second winding group () with a different winding specification from the first winding groups () is provided between each of the groups (I, II, III). Accordingly, the relative sizes of the generated voltages in the first winding groups () and the second winding groups () differ each other, allowing the realization of a compact and low cost construction capable of charging two different electric potentials from a single unit, which also enables a reduction in distortion of the waveform of the counter electromotive force, a reduction in iron loss, and an improvement in the efficiency of the motor, and enables the efficient charging of power sources with two different electric potentials.

Motor generator

A motor according to the present invention is a motor using a rotor including two first rotator portions , each having a permanent magnet , and a second rotator portion having magnetic saliency inserted therebetween, coupled in a direction of a rotating shaft , and part of the rotor is replaced with a reluctance motor, whereby an amount of the permanent magnet is reduced, thus making it possible to reduce generated voltage. Further, there are provided the first rotator portion on both sides of the second rotator portion , whereby the second rotator portion is magnetically saturated through the effective use of going-round of magnetic flux to raise salient ratio. Thus, reluctance torque caused in the second rotator portion is increased, whereby it is possible to increase torque as a whole and to obtain a high-output motor.

Motor, electric vehicle and hybrid electric vehicle

A rotor magnet of a three-phase reluctance magnet motor is magnetized by coupling two of the three outer terminals (RS), and feeding a positioning current between the outer terminals RS and a third terminal (T) for positioning the rotor at a magnetizing position with reluctance torque. Then, rotor is kept from moving by holding the shaft of the rotor with the rotor positioned at the magnetized position. Next, the outer terminals RS are separated and magnetizing current is fed between the outer terminals R and S to magnetize the rotor magnet.

Magnetizing method for rotor magnet of reluctance magnet motor

In a motor having a permanent magnet built in a rotor, a hole for preventing a short-circuit of magnetic flux is disposed so that the hole is adjacent to the outer rim of rotor core, and adjoins to a slit for receiving a permanent magnet as well as the permanent magnet per se. This structure prevents a short-circuit of magnetic flux generated by both ends of the permanent magnet, and the magnetic flux at both ends of the magnet can flow to a stator, thereby contributing to generate torque effectively. As a result, the highly efficient motor with less cogging torque, less vibration and lower noise can be provided.

Motor using a rotor including an interior permanent magnet

A brushless motor having at least one current influence detector (10a, 10b, 10c) for detecting influence of an induced voltage caused by variations of current flowing in an armature winding (3). Furthermore, a positional signal detecting circuit means (11) detects a positional signal corresponding to rotational position of the rotor (2) in accordance with the voltage signal appearing at the armature winding (3) and the output signal issued from the at least one current influence detector (10a, 10b, 10c).

Brushless motor with rotor position detection compensation caused by

A rotor of a motor includes a plurality of sets of permanent magnets 8a, 8b embedded in the rotor. Each includes a permanent magnet at an inner side and another permanent magnet at an outer side with a distance between them. Each permanent magnet 8a, 8b is formed like an arch projecting towards the center of the rotor. Magnetic flux flows easily through an interval between the permanent magnets at inner and outer sides, and the inductance in a q-axis is enlarged. Then, the reluctance torque is generated in addition to the magnet torque, and the motor has a high torque and a high output power.

Growing community of inventors

Sakai, Japan

Naoyuki Kadoya