Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1987-05-13
1989-08-22
Wong, Pete S.
Electrical generator or motor structure
Dynamoelectric
Rotary
310264, 310 67R, 41742314, H02K 2908
Patent
active
048598887
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION
This application is related to application Ser. No. 057,898, filed May 13, 1987 by the same inventors of the invention disclosed and claimed herein.
TECHNICAL FIELD
The present invention relates to a cross flow type cooling fan device installed in electric appliances such as audio-amplifiers, microcomputers, word processor, copying machine, etc. to discharge heat generated by electric components incorporated therein outside the electric appliances.
BACKGROUND ART
An impeller 1 used in a cross flow type cooling fan device of this type is conventionally formed by molding a synthetic resin and in which, as shown in FIG. 24, air blowing slits 3 are formed by a group of blades 4 around a hollow area 2 in the center of a cylindrical body. Air taken in radially from outside is sent through the air blowing slits 3 to cool the heat generated by the electric components. As the cooling air can be widely and planely sent out forming a laminar air flow, the impeller is particularly suitable for cooling the electric components disposed on a printed board.
However, because a motor 6 used for rotational driving of the impeller 1 is connected adjoiningly to the side of the impeller 1, a problem exists in that a space necessary for installing the cooling fan device is inevitably large, which is an obstacle in designing a compact electric appliance.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a cross flow type cooling fan device in which a motor is incorporated, and which is reduced in size saving a space for installation.
Another object of the present invention is to provide a cross flow type fan device capable of effectively cooling a control circuit section of a brushless motor without any other cooling system even when the motor incorporated is formed into a brushless motor.
A further object of the present invention is to provide a cross flow type fan device, in which a plurality of impellers are connected in the axial direction and adjoining air blowing slits of the impellers are arranged in staggered relationship to one another to improve air blowing efficiency.
In a cross flow type cooling fan device according to the present invention, an impeller with air blowing slits formed around the hollow area in the center of a cylindrical body is rotatably supported by a supporting frame at the ends thereof through supporting shafts, a magnet for a motor is mounted either on a rotary side formed by the impeller or the supporting shafts or on a stationary side formed by the supporting frames, and a winding for the motor is mounted confronting the aforesaid magnet for the motor, so that a rotary driving section of the impeller is constructed.
By such a construction, any additional motor to be used as a rotational driving means of the impeller is not necessary to be applied to the impeller. Instead, the magnet and winding substantially performing a motor function together are disposed between the impeller and the supporting frame thereof to rotate the impeller. As a result, the cross flow type cooling fan device is greatly reduced in size, and a space for installation thereof is reduced, thereby resulting in a feasible design of compact electric appliances.
According to the invention, it is also preferable that, when the motor included between the impeller and the supporting frame is formed into a brushless motor, a control circuit section of the brushless motor is cooled making use of cooling air from the impeller by disposing the control circuit section on one side of an air guide plate. By such a construction, it is no longer necessary to provide any other cooling system for the control circuit section, which is a further advantage from the economical point of view.
According to the invention, it is further preferable that a plurality of impellers are axially coupled and the air blowing slits of the plural adjoining impellers are arranged in staggered relationship with one another. By such a construction, there is a time lag in the air
REFERENCES:
patent: 3141607 (1964-07-01), Masters
patent: 4360751 (1982-11-01), Arnold, Jr. et al.
patent: 4634912 (1987-01-01), Heyraud
Hashimoto Kunio
Noma Hiroyuki
Ohbayashi Yoshiaki
Sakurai Katsumi
Hosiden Electronics Co. Ltd.
Jones Judson H.
Wong Pete S.
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