Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1990-04-18
1992-01-28
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 52, 310 58, 310 59, H02K 9193
Patent
active
050846426
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a channel structure for a coolant in a motor, and is especially appropriate for cooling a small motor with a high power output and a high revolutional speed by a coolant.
BACKGROUND ART
A motor cooled by a coolant can generate about 1.5 to 2 times as much power as a motor cooled by air, although the two motors have the same size, since the coolant has a high cooling ability. Furthermore, the coolant-motor can reduce an increase of a temperature of each part of the motor, due to a heat generated by a continuous high load, a core loss during a high revolutional speed, frictional loss of a bearing, and so on. Moreover, a channel for a coolant must be formed in a motor, and accordingly, in the prior art, a channel is formed when a casing of a motor is cast, and then a portion to be covered is covered by a plate member.
Generally, a motor is attached to a machine by the front end of the casing thereof, and accordingly, a coolant must be supplied from the rear of the motor, returned to the rear again, and after this cycle is repeated several times, the coolant must be returned to a tank from the rear. Therefore, a communicational channel must be formed when casting the casing so that those longitudinal channels are communicated with one another, and accordingly, the casting of the casing is very difficult when producing a casing with such a defect.
DISCLOSURE OF THE INVENTION
Accordingly, an object of the present invention is to provide a channel structure for a coolant in which the casting of a casing is easy and the cost of the casting is low.
In view of the above-mentioned object, the present invention provides a channel structure for a coolant in a motor, a casing of which is constructed by arranging a front end casing, a central casing, and a rear end casing along a longitudinal direction, characterized in that a plurality of pairs of channels are formed along the longitudinal direction through the central casing so that each pair is substantially equidistant in a circumferential direction of the central casing, an outer contour of the front end casing being a substantially polygonal column, a channel hole having a circular section being formed along the longitudinal direction at corners of the front end casing corresponding to each channel of the central casing, and another channel hole having a circular section being formed perpendicularly to an outer face of the front end casing to be communicated with the channel hole, the another channel hole being communicated with another channel hole at each of the corners.
The casting of the central casing is easy since channels for a coolant are formed in the central casing only along a longitudinal direction thereof. It is easy to provide a hole having a circular section to the front end casing at a position corresponding to a through channel formed in the central casing along the same longitudinal direction as the through channel by drilling, and to drill perpendicularly to an outer face of the front end casing of a substantially polygonal column so that a lateral hole communicated with the above-mentioned longitudinal drilled hole can be easily drilled, and both lateral drilled holes provided to adjacent outer side faces are communicated with each other. One through channel called a going channel, of each pair of through channels provided to the central casing, is communicated with one longitudinal drilled hole communicated with one lateral drilled hole communicated with the other lateral drilled hole, and therefore, is communicated with the other longitudinal drilled hole communicated with the other through channel, called a return channel, provided to the central casing. Namely, the above-mentioned going channel and return channel are communicated with each other via the drilled holes provided at a corner portion of the front end casing. The front end casing must be cooled, since a motor is generally attached to an applied machine by the front end casing. The front end casing can be sufficiently cooled s
REFERENCES:
patent: 4534686 (1985-08-01), Nakamura et al.
patent: 4691131 (1987-09-01), Nakano
patent: 4700092 (1987-10-01), Bincoletto
Katsuzawa Yukio
Masuya Michi
Nakazawa Yasuyuki
Fanuc Ltd.
Nguyen Matthew
Stephan Steven L.
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