Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1994-12-08
1999-05-04
LaBalle, Clayton
Electrical generator or motor structure
Dynamoelectric
Rotary
310 68B, H02K 1100
Patent
active
059006862
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an electric motor vehicle using a motor as a drive motive power, and particularly to an electric motor vehicle which is preferably applied to two wheelers and three wheelers such as motorcycles and scooters.
BACKGROUND ART
It is now said to be an age of electric motor vehicles. It is said that the electric motor vehicles will solve most of the environmental issues such as the exhaust gas from automobiles which is said to make up about 70% of air pollution, noises, or the like, and will extend the life of oil resources by two times or more.
Known electric motor vehicles are provided as their drive system with a battery, a motor, and a controller for controlling the speed of the motor, and a wheel is rotated by a drive transmission mechanism like conventional automobiles, or a wheel is rotated by a motor disposed on it without necessitating such a drive transmission mechanism like conventional automobiles. And, in developing an electric motor vehicle, the improvement of the performance of an onboard battery is an issue to be solved and it will not be long before it is solved.
Incidentally, the electric motor vehicle is also demanded to have its safety improved together with the improvement of its performance. A mere replacement of the drive motive power of a conventional gasoline automobile by a motor can not sufficiently provide the safety of the electric motor vehicle. Specifically, the electric motor vehicle uses electricity for a drive source, and the power is a motor which rotates at a high speed as compared with an engine. Therefore, a trouble of the electric system or a failure of the motor may suddenly stop a running vehicle or suddenly start a vehicle which was out of action. Besides, in common to a running vehicle and a stopping vehicle, there is a possibility that a driver or a mechanic may suffer from an electric shock, be caught by the drive unit in the vicinity of the motor, or break the motor or the controller when servicing. These troubles or the necessity of protection is caused due to the device or structure peculiar in the electric motor vehicle, which is not seen in conventional automobiles.
The inventors involved in the development of an electric motor vehicle propose the following points to prevent accidents or failures form occurring and to assure safety.
First point for safety: To avoid a travel motion trouble of the electric motor vehicle which may suddenly occur when traveling, for example, a sudden stop of the electric motor vehicle.
When the vehicle is exposed to wind and rain and suffers from vibration when traveling, water may enter the motor or the electric control circuit, causing an insulation failure (electrical short). This is very dangerous because it leads to a stop of the electrical motor vehicle. In this connection, the improvement of a stator fixing structure, a motor case structure will be proposed.
SUMMARY OF THE INVENTION
A conventional motor is known to have a structure to prevent the entry of water from outside as shown in FIG. 11. As shown in FIG. 11, it is known that a stator 203 is fixed to a motor case 201 by shrinkage fitting or press fitting, and an O-ring 205 is fitted at an engagement section of the motor case 201 is fitted at an engagement section of the motor case 201 and a motor cover 202. And, when a fastening bolt 204 is turned to tighten the motor cover 202 against the motor case 201, the O-ring 205 is adequately crushed to seal the motor case 201 and the motor cover 202.
The above conventional structure has a drawback that machining is difficult because holes of the motor case for fitting the stator have to be machined accurately, though sealing properties are good. And, since assembling needs two steps, one for fixing the stator by shrinkage fitting or press fitting, and the other for sealing a space between the motor case and the motor cover with the O-ring, it is necessary to reduce the works in view of workability. Further, it is known that a DC brushless motor which is often used for the electric
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Koike Yoshikazu
Kozaki Minoru
Mizukoshi Atsushi
Sasaki Nobuki
Sato Takeo
LaBalle Clayton
Seiko Epson Corporation
Tokyo R & D Co., Ltd.
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