CN102624117A - Oil internal cooling high power density hub permanent magnet motor for electric vehicles - Google Patents

Abstract

The invention discloses an oil internal-cooling high-power density hub permanent magnet motor for an electric vehicle, which comprises a shaft. A front end cover and a rear end cover are respectively sleeved at the front and rear ends of the shaft; the front end cover and the rear end cover are respectively connected with the shaft by bearings; an outer rotor sleeve is fixedly connected between the front and rear end covers; a surface-mount magnetic steel is adhered inside the outer rotor sleeve; a stator bracket fixedly connected with the shaft is arranged between the front and rear end covers; a stator adopting a fractional-slot winding structure is arranged on the stator bracket; an oil charging hole is arranged on the front end cover; the contact position of the front end cover and the shaft is sealed in a labyrinth mode; and the contact positions of the front and rear end covers and the outer rotor sleeve, the contact position of the oil charging hole and a stopper and the contact position of the rear end cover and the shaft are sealed by rubber rings. According to the hub permanent magnet motor adopting the outer rotor structure, a great of transmission parts are saved, the vehicle has simpler structure and various complex driving modes can be implemented.

Description

Oil internal cooling high power density hub permanent magnet motor for electric vehicles

technical field

The invention relates to an internal cooling type high power density hub permanent magnet motor, in particular to an oil internal cooling type motor cooling method.

Background technique

With the continuous deterioration of the world's natural environment and the tight supply of fossil energy, electric vehicles are an effective path to ensure the flexibility of human mobility and achieve sustainable development of the automotive industry while reducing dependence on fossil fuels and environmental pollution. At present, the production and use of automobiles in the world are huge and growing rapidly. Human beings are facing more and more environmental problems and energy depletion problems, and will face severe challenges. Designing and developing a high-efficiency, environment-friendly and safe vehicle is the only way to realize the sustainable development of transportation. As a new type of clean energy, electric energy will become an inevitable trend of future energy development, and electric vehicles will inevitably replace traditional fuel vehicles and become the master of the new era. my country's development in the field of electric vehicles has also achieved great results in recent years.

For hub motors, its biggest feature is the integration of power, transmission and braking devices into the hub, thus greatly simplifying the mechanical parts of electric vehicles and reducing power loss caused by automotive transmission mechanisms, gear boxes, etc. , thereby improving the performance of the vehicle. However, in the design and practical application of the motor, there are many problems that we cannot ignore, such as the temperature rise and low power density of the motor.

Contents of the invention

The object of the present invention is to overcome the deficiencies of the prior art, and provide a wheel hub permanent magnet motor for electric vehicles with light weight, small volume, simple and compact structure, small moment of inertia, and oil internal cooling.

The present invention is achieved through the following technical solutions:

The oil internal cooling type high power density hub permanent magnet motor for electric vehicles of the present invention comprises a shaft, and a front end cover and a rear end cover are respectively sleeved on the front and rear ends of the shaft, and the front end cover and the rear end The covers are respectively connected to the shaft through bearings, and the outer rotor sleeve is fixedly connected between the front and rear end covers, and a surface-mounted magnetic steel is pasted inside the outer rotor sleeve, and is installed between the front and rear end covers. There is a stator bracket fixedly connected with the shaft, a stator with a fractional slot winding structure is installed on the stator bracket, an oil injection hole is opened on the front end cover, and at the contact point between the front end cover and the shaft Labyrinth seals are used in the place where the front and rear end covers are in contact with the outer rotor sleeve, the oil injection hole is in contact with the plug, and the rear end cover is in contact with the shaft. Rubber ring seals are used.

The beneficial effects of the present invention are: 1) The hub permanent magnet motor with an outer rotor structure is adopted, a large number of transmission parts are omitted, the structure of the vehicle is simpler, various complex driving modes can be realized, and various new energy vehicle technologies are conveniently adopted. 2) The fractional slot winding structure is adopted, and its equivalent distribution effect and the weakening effect on the tooth harmonic back EMF are used to achieve the effect of improving the potential waveform and improving the utilization rate of the winding, while shortening the coil circumference and end extension length, Reducing the motor winding resistance reduces losses and increases the efficiency and power density of the motor. 3) The oil internal cooling motor cooling method is adopted to effectively reduce the temperature rise of the motor. 4) Solve the oil-filled sealing problem of the motor with internal oil cooling.

Description of drawings

Fig. 1 is the structure schematic diagram of the oil internal cooling type high power density hub permanent magnet motor for electric vehicles of the present invention;

Fig. 2 is the schematic structural diagram of the outer rotor sleeve of the motor of the present invention;

Fig. 3 is the left side view of the motor shown in Fig. 1 of the present invention;

Fig. 4 is a right view of the motor shown in Fig. 1 of the present invention.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing and embodiment:

As shown in the accompanying drawings, the oil internal cooling type high power density hub permanent magnet motor for electric vehicles of the present invention includes a shaft 7, and a front end cover and a rear end cover 1, 2 are respectively sleeved on the front and rear ends of the shaft. , the front end cover and the rear end cover are respectively connected to the shaft 7 through bearings 14, the outer rotor sleeve 3 is fixedly connected between the front and rear end covers, and the outer rotor sleeve is pasted with Surface-mounted magnetic steel 4, a stator bracket 6 fixedly connected to the shaft 7 is installed between the front and rear end covers, and a stator 5 with a fractional slot winding structure is installed on the stator bracket. There is an oil injection hole 9 on the top, a labyrinth seal 8 is used at the contact between the front end cover and the shaft, and a rubber ring seal 11 is used at the contact between the front and rear end covers and the outer rotor sleeve. The contact is sealed with a rubber ring, and the contact between the rear end cover and the shaft is sealed with a rubber ring 13.

In this motor, the surface-mounted magnetic steel 4 is pasted on the surface of the outer rotor sleeve 3 of the rotor. The outer rotor sleeve 3 of the motor is fixedly connected with the two end covers 1 and 2 of the motor through screws 12 and rotates coaxially. The outer end cover is connected to the electric motor through screws 10 The rim of the car is fixedly connected to drive the electric car. The cooling method of the motor adopts internal oil cooling, and the inside of the motor is filled with cooling oil. When the motor rotates, due to the action of centrifugal force, the oil is evenly distributed inside the motor, and the heat of the motor is transferred to the shell, thereby dissipating the heat. Improve the performance of the motor, and at the same time prevent problems such as demagnetization of the permanent magnet caused by excessive temperature rise.

The sealing scheme of the hub motor is a combination of labyrinth seal and rubber ring seal. In Fig. 1, a rubber ring seal 11 is used at the contact between the front and rear end covers and the outer rotor sleeve, and a rubber ring seal 13 is used at the contact between the rear end cover and the shaft. Inject the conventional transformer oil at the oil injection hole 9. A rubber ring is used to seal the contact between the oil injection hole and the plug, and a labyrinth seal 8 is used at the contact between the front end cover and the shaft to prevent oil leakage by using the oil friction effect and the flow contraction effect.

The cooling method of the present invention is oil internal cooling. The oil sealing scheme is a combination of a labyrinth seal and a rubber ring.

Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are only illustrative and not restrictive. Those of ordinary skill in the art Under the enlightenment of the present invention, people can also make many forms without departing from the purpose of the present invention and the scope of protection of the claims, and these all belong to the protection scope of the present invention.

Claims (1)

1. used for electric vehicle oil inner-cooling type high power density wheel hub magneto; It comprises axle; Front and back ends at described axle is with front end housing, rear end cap respectively, and described front end housing, rear end cap are connected with described axle through bearing respectively, and the external rotor cover is fixedly connected between the described front and rear cover; It is characterized in that: in described external rotor cover, be pasted with the surface-mount type magnet steel; The stator support that is fixedly connected with described axle is installed between front and rear cover, the stator that adopts the fractional slot winding structure is housed on described stator support, on described front end housing, have oil filler point; Adopt labyrinth sealing in the described front end housing and the place of the synapsis that is coupling, in described forward and backward end cap and external rotor cover contact position, oil filler point and obstruction contact position and rear end cap and the synapsis that is coupling employing seal with elastometic washer.

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