TWM460931U - Oil cooled motor - Google Patents

Abstract

An oil cooled motor which comprises a case, a front cover, a rear cover, a stator and a rotor. A case coolant inlet and a case oil channel are provided within said case. A stator resides within said case, and provided with stator cooling channel and stator cooling nozzle. A rotor resides within said stator, and provided with rotor cooling channel. The volume between said stator and said rotor forms a cylindrical oil channel. Both ends of the said case are provided with a front cover and a rear cover, respectively. A coolant outlet is provided within said rear cover. By circulation coolant within the above mentioned motor, heat generated from motor operation can be removed.

Description

Oil-cooled motor

The present invention relates to a motor structure; and more particularly to an oil-cooled motor structure that uses a circulating cooling oil to cool a motor casing, a stator, a coil, and a rotor.

The oil-cooled motor structure of the prior art is provided with an inlet end and an outlet end on the front and rear sides respectively, and the cooling oil is injected from the inlet end, flows through the stator, the air gap and the rotor, and flows out from the outlet end to cool the inside of the motor. The cooling oil flows through the inside of the motor to absorb the heat to achieve the cooling effect, but the temperature of the cooling oil is simultaneously increased, resulting in a decrease in cooling efficiency. This type of cooling creates a temperature differential inside the motor that causes the temperature near the inlet end to be lower and the temperature near the outlet end to be higher.

The main purpose of the present invention is to provide a servo motor or an induction motor for industrial machinery, which not only overcomes the shortcomings of uneven heat dissipation of the coil, but also has the advantages of high torque output and no overheating during operation.

According to the concept of the present invention, the cold motor comprises a rotor, a stator, a casing, a front cover and a rear cover; the casing comprises a cooling oil inlet end for introducing a low temperature cooling oil, the cooling oil first passing through a casing The inner casing oil passage directly absorbs the heat energy radiated from the outside of the stator, and then introduces a front cover diverting groove provided in the front cover; the front cover diverting trough introduces the cooling oil into the inner oil passage of the rotor, the stator cooling passage and the rotor, respectively. The cylindrical oil passage between the stators is finally collected into a rear cover oil collecting groove disposed in the rear cover, and the high temperature cooling oil is discharged through a cooling oil outlet end; In order to balance the heat dissipation of the coil wound on the stator, the stator is provided with a plurality of cooling oil nozzles penetrating the inner and outer sides of the stator, so that a part of the low-temperature cooling oil flowing through the outer casing oil passage is directly injected into the stator cooling passage, so that the inside of the motor Optimized heat dissipation.

Please refer to FIG. 1 to FIG. 3 , which is a first embodiment of the present invention applied to a motor. The oil-cooled motor includes a rotor 104, a stator 109, a casing 101, a front cover 102, a rear cover 103, a cooling oil inlet end 201, a cooling oil outlet end 209, a coil 108, a front bearing 106, and A rear bearing 107 is used to secure the shaft 105 of the stator. The outer side of the outer casing 101 is provided with at least one outer casing oil passage 202 for allowing the cooling oil to be introduced into the inner side of the front cover after the outer side of the cooling stator, and the front cover diverting groove 204 respectively introduces the cooling oil into the three oil passages. The stator cooling passage 207 provided on the inner side of the stator, the inner oil passage 205 provided on the inner side of the rotor, and the cylindrical oil passage 206 formed by the gap between the stator 109 and the rotor 104, and the front cover shunt groove 204 is a A sufficient volume of cooling oil buffer is provided to achieve the effect of stabilizing the circulation of each oil passage. The stator 109 is provided with a plurality of sets of stator cooling nozzles 203 to directly inject the cryogenic cooling oil partially flowing through the outer casing oil passages 202 into the stator cooling passages 207 to further average the stator temperature: the cooling oil passing through the above three oil passages will be collected. The rear cover oil collecting groove 208 is provided on the inner side of the rear cover, and finally the high-temperature cooling oil is discharged through the cooling oil outlet end 209.

When the motor is running, the most important heating element is the coil 108 provided in the stator 109. Since the cooling oil absorbs heat and heats up while cooling the motor element, if the cooling oil is injected from one end and discharged from the other end, the temperature difference between the discharge end and the injection end is likely to be excessive. The stator cooling nozzle 203 can introduce cooling oil into the high temperature zone to prevent the coil 108 from generating a local high temperature zone.

The stator 109 described in the first embodiment is manufactured by using a metal piece according to the axis. The heart direction is layered. After the metal piece is fixed by welding, it is drilled from the side to form a stator cooling nozzle 203.

If the motor is in a high temperature environment, the flow direction of the cooling oil needs to be reversed to avoid bringing the external high temperature into the motor through the outer casing 101. When the ambient temperature is higher than the internal temperature of the motor, the cooling oil inlet end 201 should be used as a cooling oil outlet, and the cooling oil outlet end 209 is used as a cooling oil inlet.

101‧‧‧ Shell

102‧‧‧ front cover

103‧‧‧Back cover

104‧‧‧Rotor

105‧‧‧Axis

106‧‧‧ front bearing

107‧‧‧ Rear bearing

108‧‧‧ coil

109‧‧‧ Stator

201‧‧‧ Cooling oil inlet end

202‧‧‧ Shell oil passage

203‧‧‧stator cooling nozzle

204‧‧‧Front cover shunt

205‧‧‧Rotor inner oil passage

206‧‧‧Cylinder oil passage

207‧‧‧ Stator cooling channel

208‧‧‧Back cover oil tank

209‧‧‧Cooling oil outlet

Figure 1 is a cross-sectional view of the creation

Figure 2 is a schematic diagram of the flow of cooling oil in this creation.

Figure 3 is a three-dimensional exploded view of the creation

101‧‧‧ Shell

102‧‧‧ front cover

103‧‧‧Back cover

104‧‧‧Rotor

105‧‧‧Axis

106‧‧‧ front bearing

107‧‧‧ Rear bearing

108‧‧‧ coil

109‧‧‧ Stator

201‧‧‧ Cooling oil inlet end

202‧‧‧ Shell oil passage

203‧‧‧stator cooling nozzle

204‧‧‧Front cover shunt

205‧‧‧Rotor inner oil passage

206‧‧‧Cylinder oil passage

207‧‧‧ Stator cooling channel

208‧‧‧Back cover oil tank

209‧‧‧Cooling oil outlet

Claims (4)

An oil-cooled motor includes: a stator having a sub-cooling passage inside the stator, the stator being provided with a cooling oil nozzle penetrating the inner and outer sides of the stator to introduce a portion of the externally flowing cooling oil into the stator for cooling a rotor, the rotor is disposed inside the stator, and a rotor inner oil passage is disposed inside the rotor, and a gap between the outer side of the rotor and the inner side of the stator forms a cylindrical oil passage; a casing is used for The stator is disposed, and a cooling oil inlet end is disposed on the outer casing, and an outer casing oil passage is disposed on the inner side of the outer casing, and the outer casing oil passage surrounds the outer side of the stator and communicates with a front cover diversion groove to allow the cooling oil to be absorbed through the outer casing oil passage. The thermal energy outside the stator is respectively introduced into the inner oil passage of the rotor, the cylindrical oil passage and the stator cooling passage; a rear cover is used for fixing the stator, and a rear cover oil collecting groove is provided on the rear cover to receive the oil passage from the inner rotor of the rotor. Cooling oil of the tubular oil passage and the stator cooling passage; a cooling oil outlet end for discharging the cooling oil of the rear cover oil collecting tank. The oil-cooled motor of claim 1, wherein the flow of the cooling oil is reversed. The oil-cooled motor of claim 1, wherein the stator cooling nozzle is machined by drilling. The oil-cooled motor of claim 3, wherein the drilling position of the stator cooling nozzle is on the weld bead.