CN110429761A - It can effectively reduce double wind path structures of high-power wide revolving speed variable-frequency motor temperature rise - Google Patents

Abstract

The invention discloses a kind of double wind path structures that can effectively reduce high-power wide revolving speed variable-frequency motor temperature rise, solve the problems, such as that high-power wide revolving speed water-cooled machine temperature rise cannot be effectively reduced in existing double air-cooled cooling air ducts.Centrifugal fan on rotor is retrofitted in cooler, influence the wind speed of circulating cooling wind and air quantity will not by motor speed；The way for drilling out radial air openings on rotor windings straight line section lead is abandoned, radial ventilation mouth is opened on the side wall of rotor windings embedded groove；The hot-air for blowing over stator winding end is introduced directly into hot air chamber, will be introduced into cold air chamber around the cooling wind of stator end by wind channel, to avoid enter into the wind of cold air chamber by stator winding end heat temperature raising.The scientific and reasonable setting of wind path of the present invention ensure that high-power wide revolving speed variable-frequency motor temperature rise meets design requirement under various operating conditions.

Description

It can effectively reduce double wind path structures of high-power wide revolving speed variable-frequency motor temperature rise

Technical field

The present invention relates to the cooling air duct in a kind of water-cooled machine, in particular to a kind of high-power wide revolving speed frequency conversion water-cooled Double wind path air cooling structures in motor.

Background technique

For high-power wide revolving speed water-cooled transducer-fed synchronous motor, it is necessary first to have continuous within the scope of wide range speed The characteristics of ability of load running, this motor is: its range of speeds span is wider, and some ranges of speeds are (15~2400) Rev/min, power of motor is larger, and power is up to 10 megawatts or more；Because its range of speeds is wider, maximum speed is again higher, by electricity The mechanical performance of machine manufacture material limits, and the rotor core of this kind of motor cannot be formed using silicon steel plate stacking, generally passes through forging The mode made forges shaft and rotor core integration；Since the centrifugal force of rotor winding end is and its revolving speed Square directly proportional, also directly proportional to the radius of rotor, the outer diameter of rotor is bigger, and the centrifugal force that the retaining ring on rotor is subjected to is just It is bigger, and the mechanics mechanical performance that shelling ring material can be born is limited, therefore, pot motor root diameter cannot be designed It is excessive, but in order to meet high-power requirement, motor entirety axial length can only be designed longer, be arranged in shaft Centrifugal fan forms circulating cooling wind path to reach inside motor between cooler, will be in motor by circulating cooling wind Heat take in cooler with cooling water carry out heat exchange, to reduce the temperature rise inside motor, for the motor of longer shaft It is general to use double wind path cooling structures, i.e., a circulating cooling is set between the driving end of motor (end AS) and rotor middle part Another circulating cooling wind path is arranged between anti-drive end (end BS) and the rotor middle part of motor, to reach preferable in wind path Cooling effect；In addition, in order to which the high temperature rise of large power rotor winding is effectively reduced, the prior art is led in rotor windings Radial air openings are drilled out on line straight line, pass through cooling wind in the hole, obtain the effect preferably to rotor windings cooling； For this kind of motor, traditional design methods are to be respectively arranged with a hot air chamber at stator both ends, between two hot air chambers It is provided with a cold air chamber in the middle part of stator, is that a point two-way has been gone after the cold air after water cooling enters in the end cap room at motor both ends The cooling task of pairs of motor: cold air blows over after stator winding end the cold wind being introduced into the middle part of motor by wind channel all the way In room, iron core interlude is cooled down, then by the air gap between stator and rotor, enters the radial direction at stator core both ends In ventilating duct, stator core both ends are cooled down, the air blown out from stator core radial ducts enters hot air chamber, so Afterwards, it enters back into cooling chamber, by the heat exchange of hot-air and cooling water, cools down to hot-air, the sky after being cooled down Gas is again gone into the end cap room at motor both ends, is so recycled, and realizes the cooling to motor；Another way cold air is blown over After rotor winding end, enters in the secondary slot of rotor windings slot bottom ventilation, then blow over the diameter being arranged on rotor winding leads again It to after ventilating duct, enters in stator and rotor air gap, the radial direction for then entering stator core both ends by stator and rotor air gap is logical It in air duct, is entered in cooler finally by hot air chamber, carries out the heat exchange of hot-air and cooling water；Existing this wind path Cooling structure haves the defects that following three aspect: (1) the centrifugal fan rotation when motor is run at the low rotational speed, on machine shaft Rotary speed is also very slow, causes circulating cooling wind circulation rate and flow all too small, the temperature rise of motor cannot be effectively reduced；(2) it passes through The cooling wind that wind channel is introduced into the cold air chamber of motor middle part is crossed, stator winding end is first blown into, by stator winding End heat heating cools down stator core middle part and iron core both ends with it, is allowed to cool effect and has a greatly reduced quality；(3) rotor around The mode that radial air openings are opened on group conducting wire straight line, will cause winding conducting wire partial cross section and narrows, directly result in the magnetic at this The close and close raising of electricity, be easy to cause winding local temperature to increase instead, meanwhile, it also will increase the manufacture difficulty, absolutely of rotor windings The embedding difficulty of edge processing difficulty and rotor windings.

Summary of the invention

The present invention provides a kind of double wind path structures that can effectively reduce high-power wide revolving speed variable-frequency motor temperature rise, solve The technical issues of high-power wide revolving speed water-cooled machine temperature rise cannot be effectively reduced in existing double air-cooled cooling air ducts.

The present invention is to solve the above technical problem by the following technical programs:

The present general inventive concept is: the centrifugal fan on rotor being changed to centrifugal fan and is attached in cooling chamber It goes, influence the wind speed of circulating cooling wind and flow will not by motor speed；It abandons and is bored on rotor windings straight line section lead Radial ventilation mouth is opened on the side wall of rotor windings embedded groove by the way of radial air openings out；Stator winding end will be blown over Hot-air be introduced directly into hot air chamber, will be introduced into cold air chamber around the cooling wind of stator end by wind channel, to keep away Exempt from the wind into cold air chamber by stator winding end heat temperature raising.

A kind of double wind path structures can effectively reduce high-power wide revolving speed variable-frequency motor temperature rise, including water cooling chamber, motor The end AS end cap room, the end motor BS end cap room and rotor windings embedded groove, be provided in the end cap room of the end motor AS the end AS stator around Group end and the end AS rotor winding end, are respectively arranged with the side AS hot air chamber and the side BS hot air chamber, In on motor stator base It is provided with cold air chamber between the side AS hot air chamber and the side BS hot air chamber, is provided between the side AS hot air chamber and the end motor AS end cap room The end AS annular endplate is communicated with the secondary slot of rotor windings slot bottom ventilation in the slot bottom of rotor windings embedded groove, and rotor windings slot bottom is logical Wind pair slot is connected together with the end motor AS end cap room, is provided at the stator winding end of the end AS on the annular endplate of the end AS The inside ventilation opening being connected to the side AS hot air chamber is provided with outside at the separate end AS stator winding end on the annular endplate of the end AS One end of air-vent, outside air-vent and induced duct links together, and the other end and the cold air chamber of induced duct are connected together；In The end motor AS cooling cycle wind driving centrifugal fan and the driving of the end motor BS cooling cycle wind are respectively arranged in water cooling chamber Centrifugal fan；Semi-cylindrical radial ducts is provided on the slot inner sidewall of rotor windings embedded groove, semi-cylindrical is radial The lower end of ventilating duct is connected together with the secondary slot of rotor windings slot bottom ventilation, the upper end of semi-cylindrical radial ducts and rotor Gap is connected together.

Inside ventilation opening on the annular endplate of the end AS is that radian is arranged at equal intervals on the same circumference；In rotor windings Semi-cylindrical radial ducts is provided in the slot of embedded groove on two sidewalls.

Cooling wind bifurcated flow ensure that cooling wind to the cooling effect of rotor, with rotor windings slot bottom by the present invention The secondary slot connection of ventilation the setting of rotor radial ventilation hole in slot for winding two sides teeth portion, do not destroy winding flux density, electricity it is close with it is exhausted Under the premise of edge, cooling rotor windings are achieved the purpose that, the design that centrifugal fan is separated with rotor solves low turn of motor The insufficient problem of cooling wind flow under speed.

Detailed description of the invention

Fig. 1 is structural schematic diagram of the invention；

Fig. 2 is the fiting relation figure between the secondary slot 18 of rotor windings embedded groove 19 and rotor windings slot bottom ventilation of the present invention.

Specific embodiment

The present invention is described in detail with reference to the accompanying drawing:

A kind of double wind path structures can effectively reduce high-power wide revolving speed variable-frequency motor temperature rise, including water cooling chamber 1, the end motor AS End cap room 4, the end motor BS end cap room 5 and rotor windings embedded groove 19, be provided in the end motor AS end cap room 4 end AS stator around Group end 6 and the end AS rotor winding end 7, are respectively arranged with the side AS hot air chamber 13 and the side BS hot air chamber on motor stator base 14, it is provided with cold air chamber 12 between the side AS hot air chamber 13 and the side BS hot air chamber 14, hot air chamber 13 and the end motor AS end in the side AS The end AS annular endplate 8 is provided between lid room 4, it is secondary to be communicated with the ventilation of rotor windings slot bottom in the slot bottom of rotor windings embedded groove 19 Slot 18, the rotor windings slot bottom ventilation secondary end slot 18 and motor AS end cap room 4 is connected together, close on the end AS annular endplate 8 The inside ventilation opening 9 being connected to the side AS hot air chamber 13 is provided at the end AS stator winding end 6, it is remote on the end AS annular endplate 8 From outside air-vent 10 is provided at the end AS stator winding end 6, outside air-vent 10 and one end of induced duct 11 are connected to one It rises, the other end and the cold air chamber 12 of induced duct 11 are connected together；The cooling of the end motor AS is respectively arranged in water cooling chamber 1 to follow Ring wind drives centrifugal fan 2 and the end motor BS cooling cycle wind to drive centrifugal fan 3；In the slot of rotor windings embedded groove 19 Semi-cylindrical radial ducts 20 is provided on inner sidewall, the lower end of semi-cylindrical radial ducts 20 and rotor windings slot bottom are logical Wind pair slot 18 is connected together, and upper end and the rotor gap 16 of semi-cylindrical radial ducts 20 are connected together；In stator Middle part radial ducts 15 and avris radial ducts 17 are provided on iron core, middle part radial ducts 15 and cold air chamber 12 connect Logical, avris radial ducts 17 is connected to the side AS hot air chamber 13.

Inside ventilation opening 9 on the end AS annular endplate 8 is that radian is arranged at equal intervals on the same circumference；In rotor windings Semi-cylindrical radial ducts 20 is provided in the slot of embedded groove 19 on two sidewalls；It is arranged in the end motor BS end cap room 5 Cooling air duct with it is identical in the end motor AS end cap room 4.

Illustrate cooling wind cyclic process of the invention by taking the cooling cycle wind path of the end motor AS as an example below, motor water cooling but room It is absorbed in 1 after the hot-air of motor heat is drawn into cooler 21 by the end AS cooling cycle wind driving centrifugal fan 2, into Heat exchange between row hot-air and cooling water, the cold air to be cooled down after heat exchange drive centrifugal wind by the end AS cooling cycle wind Machine 2 is blown into the end motor AS end cap room 4, point three Lu Hangjin: first via cooling is added after blowing air over the end AS stator winding end 6 Heat heating, this strand of wind after being heated up is entered directly into the side AS hot air chamber 13 by inside ventilation opening 9, by the end motor AS Cooling cycle wind driving centrifugal fan 2, which is sucked back into water cooling chamber 1, to be cooled down；Second tunnel cooling wind around the end AS stator around It behind group end 6, is introduced in cold air chamber 12 through air-vent 10, induced duct 11, using radial ducts in the middle part of stator core 15 enter rotor air gap 16, then enter in the side AS hot air chamber 13 by stator core avris radial ducts 17, quilt Cooling cycle wind driving centrifugal fan 2 in the end motor AS, which is sucked back into water cooling chamber 1, to be cooled down；The cooling of third road blows air over AS It is entered after the rotor winding end 7 of end in the secondary slot 18 of rotor windings slot bottom ventilation, then right by semi-cylindrical radial ducts 20 Rotor windings carry out entering rotor air gap 16 after direct contact type is cooling, then pass through stator core avris radial ducts 17 enter in the side AS hot air chamber 13, by the end motor AS cooling cycle wind driving centrifugal fan 2 be sucked back into water cooling chamber 1 into Row cooling；The scientific and reasonable setting of wind path of the present invention ensure that high-power wide revolving speed variable-frequency motor temperature rise under various operating conditions Meet design requirement.

Claims (2)

1. a kind of double wind path structures that can effectively reduce high-power wide revolving speed variable-frequency motor temperature rise, including water cooling chamber (1), motor The end AS end cap room (4), the end motor BS end cap room (5) and rotor windings embedded groove (19), the setting in the end motor AS end cap room (4) There are the end AS stator winding end (6) and the end AS rotor winding end (7), the side AS hot wind is respectively arranged on motor stator base Room (13) and the side BS hot air chamber (14) are provided with cold air chamber (12) between the side AS hot air chamber (13) and the side BS hot air chamber (14), The end AS annular endplate (8) is provided between the side AS hot air chamber (13) and the end motor AS end cap room (4), in rotor windings embedded groove (19) slot bottom is communicated with the secondary slot (18) of rotor windings slot bottom ventilation, the secondary slot (18) of rotor windings slot bottom ventilation and the end motor AS end Lid room (4) is connected together, which is characterized in that is arranged at the end AS stator winding end (6) on the end AS annular endplate (8) There is the inside ventilation opening (9) being connected to the side AS hot air chamber (13), far from the end AS stator winding end on the end AS annular endplate (8) (6) outside air-vent (10) is provided at, outside air-vent (10) and one end of induced duct (11) link together, induced duct (11) the other end is connected together with cold air chamber (12)；The end motor AS cooling cycle is respectively arranged in water cooling chamber (1) Wind drives centrifugal fan (2) and the end motor BS cooling cycle wind driving centrifugal fan (3)；In rotor windings embedded groove (19) Slot inner sidewall on be provided with semi-cylindrical radial ducts (20), the lower end of semi-cylindrical radial ducts (20) and rotor around The secondary slot (18) of group slot bottom ventilation is connected together, and the upper end of semi-cylindrical radial ducts (20) is connected to rotor gap (16) Together.

2. a kind of double wind path structures that can effectively reduce high-power wide revolving speed variable-frequency motor temperature rise according to claim 1, It is characterized in that, the inside ventilation opening (9) on the end AS annular endplate (8) is that radian is arranged at equal intervals on the same circumference；In Semi-cylindrical radial ducts (20) are provided on two sidewalls in the slot of rotor windings embedded groove (19).