Asmo Co., Ltd.

Toshimoto Ito

Akihiko Suzuki

Takeo Noda

Toshihiro Tanino

Shouichi Yoshikawa

Yousuke Natsume

Yasushi Ueda

Tetsuro Shimmura

Isamu Adachi

A motor holder receives a motor main body and includes a plurality of ribs, which are provided to an inner peripheral surface of the motor holder and are engaged with an outer peripheral surface of a motor yoke to hold the motor main body. The ribs are arranged symmetrically about a reference line, which is perpendicular to a rotational axis of a rotatable shaft and passes through a rotational center of the rotatable shaft and a circumferential center of each of the two power supply brushes.

Blower motor for vehicle air conditioning system

An electric rotating machine and a fan motor for vehicle are obtained, wherein variation width of current waveform resulting from occurrence of coils in a short circuit state is narrowed to reduce vibration and noise. A commutatorof the fan motor for vehicle comprises twelve segments, and a pair of positive/negative brushes are press-contacted to the commutator. Among the segments, at least one of pairs of segments that the brushes simultaneously contact have mutually different pitches. Therefore, timing when the coil in the short circuit state occurs at an armature and timing when the coil is released from the short circuit state of one brush deviate from those of the other brush temporally. Accordingly, the variation width of current waveform of electric current supplied to the coil connected to the pair of segmentsnarrows at least. As a result, the vibration of the electric rotating machine, variation of rotating torque, and the noise are considerably reduced, and life thereof is thus extended as well.

Dynamo-electric machine and fan motor for vehicle

A rotor and each magnet are configured to satisfy one of the following conditions: (D&pgr;/Z)Xn&plus;T<X<(D&pgr;/Z)&times;(n&plus;1)&minus;T and (D&pgr;/Z)&times;(n&minus;1)&plus;T<X<(D&pgr;/Z)Xn&minus;T. Here, Z is a number of cores. D is an outer diameter of the rotor. T is a circumferential dimension of a tooth of each core. X is a circumferential dimension between a circumferentially innermost one of first and second opposing points of a first tapered portion and a circumferentially innermost one of first and second opposing points of a second tapered portion. The first and second opposing points radially oppose first and second imaginary end circles, respectively, defined by outer peripheral surfaces of the cores. Furthermore, n is the number of the teeth that are entirely placed within a range defined by X when a circumferential center of one of the teeth is radially opposed to a circumferential center of the range defined by X.

Dynamo-electric machine having tapered magnets secured to yoke

Growing community of inventors

Toyohashi, Japan

Toshimoto Ito