Mitsuba Corporation

Hiroto Tanaka

Masaaki Kimura

Naoki Kojima

Takeshi Kanai

Tomohiko Annaka

Tamotsu Iwazaki

Koji Tsuchiya

Junya Kitazawa

Toshiyuki Amagasa

Teppei Tokizaki

Natsumi Tamura

Hirokazu Shoda

Hiroji Okabe

Toru Furusawa

Tomofumi Kobayashi

Satoshi Tamura

Hachidai Watanabe

A brushless motor () which supplies currents to coils (U, U, V, V, W, and W) and rotates a rotor (), the brushless motor comprising a control apparatus () which switches and selectively executes: first energization control to start energization to the coils (U, U, V, V, W, and W) at first timing, and to continue the energization for a first period to control the rotation number of the rotor (); and second energization control to start energization to the coils (U, U, V, V, W, and W) at second timing advanced by an electric angle with respect to the first timing, and to continue the energization for a second period longer than the first period to control the rotation number of the rotor ().

Brushless motor, wiper apparatus, motor apparatus and control method for motor apparatus

In a 4-pole, 6-slot, 18-segment electric motor, one forward winding coil () and two reverse winding coils () are wound on each tooth (). When the forward winding coils are formed of coils corresponding to a U phase, a V phase, and a W phase and the reverse winding coils are formed of coils corresponding to a '&#x2212;U' phase, a '&#x2212;V' phase, and a '&#x2212;W' phase, the coils, which correspond to a U phase, a &#x201c;&#x2212;W&#x201d; phase, a &#x201c;&#x2212;W&#x201d; phase, a V phase, a &#x201c;&#x2212;U&#x201d; phase, a &#x201c;&#x2212;U&#x201d; phase, a W phase, a &#x201c;&#x2212;V&#x201d; phase, and a &#x201c;&#x2212;V&#x201d; phase, are electrically connected in this order between the adjacent segments. When the number of turns of the coils () corresponding to a U phase, a V phase, and a W phase is denoted by T1, the number of turns of the coils (), which correspond to a &#x201c;&#x2212;U&#x201d; phase, a &#x201c;&#x2212;V&#x201d; phase, and a &#x201c;&#x2212;W&#x201d; phase and first come into sliding contact with a brush, is denoted by T2, and the number of turns of the coils (), which correspond to a &#x201c;&#x2212;U&#x201d; phase, a &#x201c;&#x2212;V&#x201d; phase, and a &#x201c;&#x2212;W&#x201d; phase and later come into sliding contact with the brush, is denoted by T3, &#x201c;T2&#x3e;T1&#x3e;T3&#x201d; is satisfied.

Electric motor with commutator segments, anode and cathode brushes and coils having varying number of turns based on anode brush position angle

In a brush holder accommodating partof a gear housing, paired flat surface partsand paired curved partsare alternately disposed so as to be formed into an elliptical shape, one of the paired flat surface parts is formed with first heat sinks, and two brushesandmounted on a brush holder unitaccommodated in the brush holder accommodating partare disposed near the first heat sinks

Motor with speed reduction mechanism

A wiper motor has: a magnet disposed on the yoke and formed with at least four poles; an armature disposed on an inner side of the magnet; a speed reduction mechanism unit having an output shaft for transmitting the rotation of the armature shaft; a gear housing connected to the yoke; a gear housing cover covering an opening of the gear housing; a magnet attached to the output shaft of the speed reduction mechanism unit; an absolute position detecting sensor disposed so as to face the magnet; and a control board having the absolute position detecting sensor attached thereto, the control board being disposed between the gear housing and the gear housing cover, and configured to control the rotation of the armature shaft.

Wiper motor

A motor case () in which a stationary portion () is fixed, and a gear case () in which a gear mechanism (SD) is accommodated are made of aluminium, most heat generated from the stationary portion () at the time of actuation of a brushless wiper motor () can be directly dissipated outside from the motor case (). That is, compared with conventional technique, heat transmitted to the motor case () can be efficiently dissipated outside, and the motor case () does not reach high temperature. Therefore, as a matter of course, reduction in size and weight can be achieved, suppression of electromagnetic noise can be achieved, and heat-resistance strength can be enhanced. Expensive components capable of resisting high temperatures are not required, and reduction in manufacturing cost can be achieved.

Brushless wiper motor

A brushless motor comprises: a statorhaving armature coils, and; a rotorwhich is rotated by a revolving magnetic field; and a switching element, wherein the brushless motor has a rotation number control unitwhich switches between low-speed and high-speed mode, wherein in the low-speed mode, the rotation number control unitsupplies current to the armature coils, andat predetermined energization timing and controls a duty ratio to control the rotation number of the rotor, and in the high-speed mode, the rotation number control unitsupplies current to the armature coils, andat energization timing advanced from the energization timing for the low-speed mode, thereby performing field weakening control of weakening the revolving magnetic field from that of the low-speed mode to control the rotation number of the rotor

Brushless motor and wiper apparatus

A motor control device is provided which controls a motor by performing switching between forward rotation and reverse rotation so as to cause an object to be controlled to reciprocate, the motor control device including a lead angle map storage unit configured to store a lead angle map in which a motor rotation speed and a lead angle to be set are associated for each of the forward rotation and the reverse rotation, a target rotation speed-setting unit configured to set a target rotation speed of the motor based on an input signal from outside, a lead angle-setting unit configured to obtain the lead angle associated with the set target rotation speed by referring to the lead angle map and set the lead angle as a lead angle of the motor, and a driving control unit configured to control rotation of the motor so as to achieve the set target rotation speed and the set lead angle.

Growing community of inventors

Kiryu, Japan

Hiroto Tanaka