Low-speed big-diameter high-torque asynchronous motor
The present invention relates to motor, be specially a kind of low-speed big-diameter high-torque asynchronous motor.
In some specific applications, as electric drive rig, AC frequency conversion winch etc., load needs low-speed high-torque to drive.Prior art drives load after adopting motor to slow down by gear reduction unit (case) again.But gear reduction unit need occupy certain space, is unfavorable for the general layout of relevant device, and simultaneously, the machinery driving efficiency of gear reduction unit is also lower.The electricity driving is the inevitable choice of technical development to adopt low-speed big-diameter high-torque asynchronous motor to carry out directly to respective load.The bibliographical information that relates to the low-speed big-diameter high-torque asynchronous motor configuration aspects of direct driving does not at present almost have.And there are many defectives in the structure of normal asynchronous or existing so-called low speed asynchronous motor, can't satisfy the specification requirement of the asynchronous motor that directly drives under low speed, major diameter, high torque (HT) state.
The load that low-speed big-diameter high-torque asynchronous motor bears is big, needs large-scale squirrel cage asynchronous motor rotor.The cage rotor winding divides cast aluminium and two kinds of structures of copper bar usually.Relatively large asynchronous motor uses cast-in aluminum squirrel cage formula rotor usually at present, and the cast-aluminum rotor winding is prone to casting flaw, influences rotor rate of finished products and performance parameters such as motor slip ratio, efficient, operational failure rate height.Do not see at present the report that on large-sized asynchronous motor, uses copper sliver cage rotor winding.Simultaneously, rotor punching adopts the full circle punching out, and waste is big, and cost is higher.The rotor of not seeing at present large-sized asynchronous motor uses the report of segmental punching.The relatively large asynchronous motor stator segmental punching that adopts mostly unshakable in one's determination has two standing screw holes on every punching outside, and punching is stacked in draws on the screw rod, compress by trim ring, then by nut tightly welding.But in running,, add the weight of punching itself and the influence of vibration simultaneously because the influence of magnetic flux draws screw rod to generate heat, lug easily takes place in stator core, just indivedual segmental punchings protrude in iron core, scratch stator winding insulation when serious, cause the short fault of motor ground connection or circle.Perhaps, cause distortion unshakable in one's determination, generally, solve problem on deformation drawing welding of screw rod middle part or mounting plate because magnetic flux, the weight of punching itself and the influence of vibration draw screw rod to have amount of deflection, but complex process, the reliability requirement height.
Summary of the invention
The present invention is directed to the development trend that certain loads needs low speed, big torque asynchronous motor directly to drive,, provide a kind of low-speed big-diameter high-torque asynchronous motor by appropriate design to partial structurtes.
The present invention adopts following technical scheme to realize: low-speed big-diameter high-torque asynchronous motor, comprise the stator assembly parts that contain organic block, stator core, stator winding and contain the rotor assembly parts of rotating shaft, rotor core, rotor winding, be fixed with rotor field spider in the rotating shaft, segmental punching is adopted in rotor core, full circle is pieced together solid on rotor field spider, and the rotor winding is made of with the copper end ring that the soldering of copper sliver is connected copper sliver, copper sliver two ends.The stator poles of low-speed high-torque asynchronous motor is more, so stator diameter is bigger, and correspondingly root diameter is also bigger; By rotor field spider is set, when saving the rotor punching material, can satisfy the needs of rotor major diameter; Rotor core adopts segmental punching further to save material, reduced cost; Copper sliver cage rotor has overcome the defective of cast-in aluminum squirrel cage rotor.
For further improving performance, increase operational reliability, segmental punching is adopted in stator core, has two standing screw holes on every segmental punching outside; One side of fan type punching has groove, and opposite side is provided with double wedge; Segmental punching is stacked on the baffle plate that draws screw rod and support, arranges bowlder fanning strip splicing lateral raised teeth and groove simultaneously and fastens mutually.Adopt mutually to fasten (or claiming coupling) segmental punching stator core structure, be coupled each other (or fastening), form an integral body, prevented the generation of stator core lug and metaboly by segmental punching.Draw stress on the screw rod also less than original structure simultaneously, the influence of distortion is controlled in certain scope, has guaranteed motor safety, reliability service.
Low-speed big-diameter high-torque asynchronous motor reasonable in design of the present invention, the efficient height, temperature rise is low, and failure rate is low, and is safe and reliable.Can be used for fields such as electric drive rig, winch, China's electric drive rig that is through with does not have directly to drive the history of rig.This low-speed big-diameter high-torque asynchronous motor also can be used in the similar operating mode of other service conditions.
Description of drawings
Fig. 1 is the structural representation of low-speed big-diameter high-torque asynchronous motor of the present invention;
Fig. 2 is structure and row's circle schematic diagram of the segmental punching of stator core;
Fig. 3 is that the A of Fig. 1 is to partial view;
1-rotating shaft among the figure; Outer seal ring behind the 2-; Outer bearing cover behind the 3-; The 4-base bearing; Internal sealed ring behind the 5-; Inside cap behind the 6-; The 7-rotor field spider; The 8-rear end cap; The 9-tight fixed bolt; The 10-rotor core; The 11-support; The 12-stator core; 13-copper sliver; The 14-stator winding; 15-copper end ring; 16-is arm-tie fixedly; The 17-front end housing; 18-axle brush carrier; Inside cap before the 19-; The 20-auxiliary bearing; Outer bearing cover before the 21-; Internal sealed ring before the 22-; The 23-encoder; The 24-protective cover; The 25-blower fan; The 26-terminal box; The 27-outlet housing; 28-standing screw hole; The 29-groove; The 30-double wedge; The 31-baffle ring; The 32-ring key.
Low-speed big-diameter high-torque asynchronous motor, comprise the stator assembly parts that contain organic block 11, stator core 12, stator winding 14 and contain the rotor assembly parts of rotating shaft 1, rotor core 10, rotor winding, be fixed with rotor field spider 7 in the rotating shaft 1, segmental punching (is a full circle as 9 segmental punchings) is adopted in rotor core 10, full circle is pieced together solid on rotor field spider 7, and the rotor winding is made of with the copper end ring 15 that the soldering of copper sliver is connected copper sliver 13, copper sliver two ends.Rotor segmental punching inboard has dovetail, and dovetail inserts fixedly arm-tie 16, and fixedly arm-tie 16 radially is fixed on the rotor field spider 7 by fastening bolt 9, realizes that with this assembly of rotor core on rotor field spider is solid.Copper end ring 15 is a zigzag structure, and copper sliver 13 inserts soldering in the serrated slot.During concrete enforcement, rotor core 10 is a full circle with 9 segmental punchings, and full circle is pieced together on rotor field spider.Each segmental punching has 6 ventilation holes, and full circle is totally 54 ventilation holes.Behind the core pressing, from ventilation hole, evenly at interval penetrate 18 roots rotor pull bars, two ends with nut tightly welding.Be with baffle ring 31 and ring key 32 in the rotating shaft 1, be used for the location of rotor field spider in rotating shaft.Segmental punching is adopted in stator core 12, has two standing screw holes 28 on every segmental punching outside; One side of fan type punching has groove 29, and opposite side is provided with double wedge 30; Segmental punching is stacked on the baffle plate that draws screw rod and support, arranges bowlder segmental punching splicing lateral raised teeth 30 and groove 29 simultaneously and fastens mutually.Compress by trim ring again, then two ends by nut tightly welding.Driving end (rotating shaft external part) in rotating shaft 1 is provided with base bearing 4 (adopting the NU2244 roller bearing), is provided with auxiliary bearing 20 (adopting 6236 ball bearings) at the other end of rotating shaft 1.This auxiliary bearing is in order to bear the rotor axial power under the motor operating condition.In order to protect bearing, prevent the damage of shaft current to bearing, be provided with a brush carrier 18 at the end (non-transmision end) of rotating shaft 1; Have screw on the preceding inside cap 19 of motor, be used for fixing gusset piece, have teeth groove fixed axis brush carrier 18 on the gusset piece, axle brush carrier 18 is provided with brush.Support 11 adopts welding, is interior muscle structure, and former has the ventilation hole of 48 φ 50.External surfaces smooth, reliable in structure.Stator winding 14 uses moulding winding (being that the winding conductor cross section is plain conductor).Select the moulding winding, failure rate is low, the dependability height.At the top of support 11 centrifugal fan 25 is installed, the wind that is sucked by blower fan is by the ventilation hole of support, the ventilation hole of rotor punching and the ventilation hole of rotor field spider 7, and air outlet and the outlet housing 27 by rear end cap 8 bottoms blows out then.Outlet housing is provided with protection network, prevents that foreign matter from entering.
This low-speed big-diameter high-torque asynchronous motor first Application directly drives in the rig in exchanging, and the motor important technological parameters is as follows:
Type: squirrel-cage asynchronous motor
Rated power: 375kW
Rated voltage: 600V
Rated current: 527A
Rated frequency: 24Hz
Synchronous speed: 120r/min
Rated speed: 101r/min
Rated power factor: 〉=0.775
Rated efficiency: 〉=88.3%
Permanent merit maximum speed: 217r/min
Maximum speed: 390r/min
Nominal torque: 35224N.m
Breakdown torque: 52836N.m
The class of insulation: 200 grades
Draft type: forced ventilation (carrying blower fan, power of fan 11kW)
Degree of protection: IP54
Rotor number: 126
Rotor core is long: 500mm
Rotor core external diameter: 1267mm
Rotor core internal diameter: 1070mm
Number of poles:. 24
Number of stator slots: 144
Stator core is long: 500mm
Frame diameter: 1450mm
Frame bore: 1270mm