Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1982-06-14
1984-08-14
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 58, 310 59, 310 63, H02K 906
Patent
active
044659482
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a device for cooling motors, and more particularly to the improvement in the construction of a device for cooling motors which run in both forward and reverse directions, so that the cooling air can be expelled more efficiently.
2. Background Art
In order to radiate the heat that is generated by iron losses, copper losses and the like when the motor is operated continuously, a known cooling device consists of permitting the rotary shaft of a motor to protrude into a cooling chamber that is formed on the outside of the motor case, attaching blade-type cooling fins to the protruded portion in a radial manner to form a vane wheel, forming an exhaust hole in the central portion of the rear wall of the cooling chamber (hereinafter, the side of the motor case is referred to as the front direction relative to the cooling chamber, and the opposite side is referred to as the rear direction), and permitting the cooling air taken in from the front direction of the cooling chamber to pass through the blade-type cooling fins and be expelled rearwards in the axial direction through the exhaust hole, so that the generated heat is radiated. In order to enhance the cooling effect, furthermore, it has also been attempted to mount the exhaust blower on the rear wall of the cooling chamber by some means so that the blower faces the exhaust hole, and so that the blower may cooperate, together with the blade-type fins, to intensify the flow of the cooling air.
The above-mentioned cooling devices, however, have been constructed based on an idea that the motor, i.e., the blade-type cooling fins, and the exhaust blower rotate in the same direction.
In recent years, motors that serve as actuators have been finding a diversified range of applications accompanying the development in industrial machinery. Among such applications, a motor which is capable of running in either the forward direction or the reverse direction without reversible means has been frequently employed.
If the conventional cooling device is adapted to the reversible motor, the stream of cooling air produced by the blade-type fins reversely acts upon the stream of air that is produced by the vanes of the exhaust blower when the motor is reversely rotated, i.e., when the blade-type cooling fins are rotated in the direction opposite to the running direction of the exhaust blower. Therefore, rotation of the exhaust blower is hindered or is often stopped, making it difficult to smoothly expel the cooling air. This phenomenon is described below in further detail. The air stream created by the blade-type cooling fins flows in a spiral manner accompanying the rotation of the cooling fins, i.e., flows in a whirling manner, and is expelled in the axial direction. Therefore, when the cooling fins rotate in the same direction as the exhaust blower, the spiral flow of the air stream so works as to impart a rotational force to the vanes of the exhaust blower. On the other hand, when the blade-type cooling fins are rotated in the reverse direction, the direction of spiral flow of the cooling air stream is reversed, and reversely acts upon the vanes of the exhaust blower, so that the rotation of the exhaust blower is hindered giving rise to the occurrence of trouble. To solve this problem, therefore, it is most desirable to rectify the spiral flow, or whirling flow, of the air stream created by the blade-type cooling fins into a linear flow so that it is expelled by the exhaust blower.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide a device for cooling a reversible motor, which device has an improved construction to rectify the flow of the cooling air so that a good cooling effect can be obtained when the motor is running either in the forward direction or in the reverse direction, and which can be simply and cheaply constructed.
According to the present invention, there is provided a device for cooling a reversible motor, characterized in that a rotary shaft is protruded into a co
REFERENCES:
patent: 1751424 (1930-03-01), Rosenthal
patent: 3502916 (1970-03-01), Stavrache
patent: 3719843 (1973-03-01), Dochterman
patent: 4132912 (1979-01-01), Wright
Hayashi Yoshiyuki
Koyoshida Shigeru
Nakamura Kosei
Oyama Shigeaki
Fujitsu Fanuc Limited
Skudy R.
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