CN206878647U - A kind of permagnetic synchronous motor cooling system - Google Patents

Abstract

A cooling system for a permanent magnet synchronous motor, comprising a casing jacket, a cooling casing, an end cover, a stator core, a copper wire winding, a balance plate, a rotor core, and a rotating shaft, and the stator core is sealed and fixed on the inner periphery of the cooling casing On the wall, the outer shell of the casing is sealed and socketed with the cooling casing, and the inner peripheral wall of the outer casing of the casing and the outer peripheral surface of the stator core are combined with the cooling casing to form a cavity. The outer casing is provided with a liquid inlet and a liquid outlet, and the liquid inlet and liquid outlet are connected with both ends of the flow channel in the inner cavity to form a cooling liquid circuit. The motor cooling system uses the inner cavity flow channel in the cooling casing to directly flow the cooling liquid through the outer peripheral surface of the stator core to perform convective heat exchange, which eliminates the contact thermal resistance between the stator core and the cooling casing, and eliminates the The heat conduction process in the thickness direction of the casing itself has achieved the effect of improving the heat dissipation performance of the motor cooling system.

Description

A permanent magnet synchronous motor cooling system

Technical field:

The utility model relates to the field of motors, in particular to the cooling technology of motors, in particular to a permanent magnet synchronous motor cooling system.

Background technique:

The permanent magnet synchronous motor has the characteristics of small size, high electromagnetic load and high torque, and has been widely used in pure electric vehicles. With the further increase of power density, the temperature rise of the motor continues to run under the condition of large current High temperature will cause motor failure and affect the driving reliability of electric vehicles. Therefore, the working efficiency of the total motor cooling system is very important. At present, the cooling methods of permanent magnet synchronous motors mainly include forced air cooling and liquid cooling, of which liquid cooling is more common .

In the prior art, the permanent magnet synchronous motor generally installs the motor stator on the inner wall of the cooling casing, has a flow channel on the outer peripheral wall of the casing, and seals the outer casing casing outside the outer peripheral wall of the casing with the cooling flow channel. In addition, flow passages, inlets and outlets for cooling liquid circulation are opened on the outer casing of the casing. The heat generated by the motor is conducted to the inner wall of the casing through the stator core, and then transferred to the outer wall of the casing through heat conduction, and is taken away by the convection heat exchange between the surface of the cooling channel on the outer wall of the casing and the cooling liquid. Due to the influence of the surface roughness of the stator and the inner wall of the casing, there are gaps that are prone to contact thermal resistance, and the gap filled with air has poor heat transfer capability, which greatly reduces the heat dissipation performance of the motor.

Invention content:

The purpose of the utility model is to overcome the shortcomings of the prior art and provide a forced liquid cooling system capable of eliminating the contact thermal resistance between the motor stator and the cooling casing, which has high heat dissipation performance and simple structure.

The liquid-cooled cooling system for permanent magnet synchronous motors of the present utility model includes a casing jacket, a cooling casing, an end cover, a stator core, a copper wire winding, a balance plate, a rotor core, a rotating shaft, and an end cover seal. Covered on both sides of the outer shell of the casing, the copper wire winding is installed in the slot of the stator core, the balance plate and the rotor core are fixed on the rotating shaft, wherein the stator core is sealed fixed on the inner peripheral wall of the cooling casing, the outer casing of the casing is sealed and sleeved with the cooling casing, the inner peripheral wall of the outer casing of the casing and the outer peripheral surface of the stator core are combined with the cooling casing to form a cavity, The cooling casing is provided with a baffle plate and the cavity to form an inner cavity flow channel, and the outer casing of the casing is provided with a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet are connected to the Both ends of the flow channel in the inner cavity are connected to form a coolant circuit.

Further, the flow baffle is axially arranged on the cooling casing.

Further, the cooling casing and the casing casing are sealed by welding.

Further, the junction of the stator core and the cooling casing is coated with a sealant layer.

The working principle of the utility model is: the cooling liquid enters the inner cavity flow channel of the cooling casing through the liquid inlet on the casing casing, and in the inner wall composed of the casing casing inner peripheral wall, the outer peripheral surface of the stator core and the flow partition plate, In the flow channel of the cavity, the coolant flows through the surface of the stator core and flows out through the liquid outlet on the outer shell of the casing, and then circulates through the external cooling. The convective heat exchange between the cooling liquid and the stator core in the cooling system replaces the heat dissipation method in the prior art which uses heat conduction between the stator core and the cooling casing, and then convective heat exchange between the cooling casing and the cooling liquid.

Compared with the prior art, the utility model has positive and obvious effects. The utility model uses the inner cavity flow channel in the cooling casing to directly flow the cooling liquid through the outer peripheral surface of the stator core to perform convective heat exchange, which eliminates the contact thermal resistance between the stator core and the cooling casing, and eliminates the The heat conduction process in the thickness direction of the shell itself achieves the effect of improving the heat dissipation performance of the motor cooling system.

Description of drawings:

Fig. 1 is the front sectional schematic view of the utility model

Fig. 2 is a structural schematic diagram of the cooling cabinet of the present invention

Fig. 3 is a schematic diagram of the flow path of the cooling liquid cavity in the cooling cabinet of the present invention

detailed description:

Example 1:

As shown in Figures 1 to 3, in the liquid-cooled cooling system for permanent magnet synchronous motors of the present invention, the end caps 11 are sealed on both sides of the casing outer shell 2, and the copper wire windings 4 are inserted in the inserts of the stator core 8. In the groove, the balance plate 5 and the rotor core 7 are fixed on the rotating shaft 6, and the motor stator core 8 is fixed on the inner peripheral wall surface of the cooling case 3 and the junction with the cooling case 3 is sealed and fixed with a sealant layer 12, and the cooling machine The shell 3 is welded and sealed with the outer casing 2 and the flow partition plate 21 is combined to form a loop of the flow channel 9 in the inner cavity. Under the action of pump pressure, the cooling oil flows into the outer surface of the casing through the liquid inlet 1, enters the flow channel 9 in the inner cavity of the cooling casing, circulates through the outer surface of the stator core 8 under the action of the flow partition plate 21, and then flows through the inner The cavity flow channel 9 flows out from the liquid outlet 10, and circulates after cooling. Since the cooling oil is in direct contact with the outer surface of the stator core 8 of the motor, the heat dissipation efficiency is high under the action of forced convection heat exchange, so the structure of the cooling system can meet the heat dissipation requirements of the high power density liquid-cooled permanent magnet synchronous motor.

Claims (4)

1. A cooling system for a permanent magnet synchronous motor, comprising a casing outer cover, a cooling casing, an end cover, a stator iron core, a copper wire winding, a balance plate, a rotor iron core, a rotating shaft, and the end cover is sealed on the outer casing of the casing On both sides, the copper wire winding is installed in the slot of the stator core, the balance plate and the rotor core are fixed on the rotating shaft, and the feature is that the stator core is sealed and fixed on the cooling On the inner peripheral wall surface of the casing, the outer casing of the casing is sealed and socketed with the cooling casing, the inner peripheral wall of the casing outer casing and the outer peripheral surface of the stator core are combined with the cooling casing to form a cavity, and the cooling casing A baffle plate is arranged on the top and the cavity forms an inner cavity flow channel, and a liquid inlet and a liquid outlet are arranged on the outer shell of the casing, and the liquid inlet and liquid outlet are connected to the inner cavity flow channel. The ends are connected to form a coolant circuit. 2. A permanent magnet synchronous motor cooling system according to claim 1, characterized in that: the flow divider is axially arranged on the cooling casing. 3. A permanent magnet synchronous motor cooling system according to claim 1, characterized in that: said cooling casing and said casing outer casing are sealed by welding. 4. A permanent magnet synchronous motor cooling system according to claim 1, characterized in that: a joint of the stator core and the cooling casing is coated with a sealant layer.