JPH04190657A - Cooling mechanism of electric automatic - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cooling mechanism for an electric vehicle that is non-polluting and can efficiently and freely transport people or cargo.

[Prior Art] Electric vehicles are attracting attention as a solution to the greenhouse effect and air pollution problems caused by the concentration of carbon dioxide in the atmosphere due to exhaust gas from current internal combustion engines. However, compared to internal combustion engine cars, electric cars
Both horsepower and torque are considerably lower, and due to problems with the efficiency of the drive motor or the electric capacity of the battery, the mileage per charge cannot be said to be sufficient, and the surface temperature of the motor increases with the rotation speed of the motor. When the temperature rises abnormally, the efficiency of the motor decreases due to damage to the coil of the conductor or demagnetization of the magnet, making cooling the motor a major issue.

[Problems to be Solved by the Invention] Even if natural wind is used to cool the driving electric motor, even if it is always air-cooled during running, sufficient air cooling cannot be obtained when the drive motor stops, and natural wind in midsummer In this case, even if 0 forced air cooling, which is not effective as a cooling air, is performed, an additional blower is required for that purpose, which further increases the consumption of electricity and reduces the mileage per charge.

The present invention aims to solve this drawback, and its purpose is to provide piping made of a material with excellent thermal conductivity for guiding cooling water between the stator of the drive motor and the housing. It is an object of the present invention to provide an electric vehicle that can prevent the drive motor from being damaged due to abnormal temperature rise and maintain high motor efficiency.

[Means for Solving the Problems] In order to solve the above problems, the electric vehicle of the present invention is an electric vehicle driven using the rotational force of an electric motor.
The present invention is characterized in that a pipe made of a material with excellent thermal conductivity is provided between the stator of the drive motor and the housing to guide cooling water.

[Embodiment] Fig. 2 is an explanatory view of the housing of the drive motor of the present invention, in which a part of the body of the motor housing 2 is made into an oven, so that the motor stator 5 can be cooled by natural wind. A space 4 is provided between an electric motor housing 2 and an electric motor stator 3 for installing piping 1 for flowing cooling water. The space 4 is made as wide as possible along the outer periphery of the motor stator. The cooling water cools the heat generated from the windings of the motor stator 5, thereby avoiding damage to the windings and thermal demagnetization of the magnets used in the rotor.

The characteristics required of the material used for the piping 1 in this cooling means include high thermal conductivity;
Under these conditions, aluminum, copper, etc. are effective. In particular, aluminum is highly extensible and can be processed into various shapes, increasing the degree of freedom of the pipe 1. Furthermore, when exposed to air, a thin, dense oxide film forms on the surface to protect it from corrosion, making it possible to construct a highly reliable cooling system.

The basic piping method is to make the surface area of the piping 1 as large as possible so that it can absorb as much heat from the drive motor as possible. FIG. 1 is a partial explanatory diagram showing an embodiment of the cooling method according to the present invention, and FIG. 3 is a cross-sectional perspective view of the embodiment in FIG. It is divided into small pieces and brought into contact with the outer circumferential side of the motor stator 3 to obtain sufficient cooling efficiency. −
On the other hand, the cooling water piping l whose temperature has increased by cooling the electric motor stator 3 is returned to one piping 1 and then connected to the electric motor housing 2.
In addition, if bare pipe piping as shown in Figures 1 and 3 does not provide sufficient cooling, the piping can be coiled as shown in Figure 4 to prevent a reduction in cooling efficiency. By inserting the cooling coil 6, whose surface area has been further expanded by providing aluminum plate fins 5, into the space between the motor stator 3 and the motor housing 2, higher cooling efficiency can be obtained and the assembly of the cooling system can be simplified. can be converted into

By providing the piping 1 for flowing cooling water on the outer peripheral side of the electric motor stator 5 of the drive electric motor as described above, more efficient cooling than air cooling can be obtained, and it has been conventionally used for cooling internal combustion engines. The existing radiator can be used as is, and a very simplified cooling system can be constructed, which improves ease of assembly and is very advantageous in terms of maintenance.

[Effects of the Invention] As explained above, the present invention provides an electric vehicle that is driven using the rotational force of an electric motor, and has an electric vehicle with excellent thermal conductivity for guiding cooling water between the stator of the driving electric motor and the housing. Piping made of this material is installed, and cooling water from the radiator, which is conventionally used to cool the engine, can flow through this piping, resulting in higher cooling efficiency than air cooling, and reducing the damage caused by the motor windings due to heat generation. The reduction in mechanical efficiency due to burnout and magnet demagnetization is minimized, allowing for comfortable driving, and the extremely simple cooling system makes it easy to maintain.

[Brief explanation of drawings]

FIG. 1 is a partial explanatory diagram of an embodiment of the present invention. FIG. 2 is an explanatory diagram of the housing of the drive motor in the present invention. FIG. 3 is a cross-sectional top view of the embodiment shown in FIG. 2. FIG. 4 is a schematic explanatory diagram of cooling water piping used in an embodiment of the present invention. 1... Piping 2... Motor housing 3...
・Electric motor stator 4...Space 5...Plate fin 6...Cooling coil and above Applicant Seiko Epson Co., Ltd. Agent Patent attorney Kizobe Suzuki and 1 other person $/Diagram

Claims (1)

[Claims] An electric vehicle driven by the rotational force of an electric motor, characterized in that piping made of a material with excellent thermal conductivity for guiding cooling water is provided between the stator of the driving electric motor and the housing. cooling mechanism.