Reinforced insulation structure applied to low-voltage variable frequency motor random winding
A variable frequency motor and reinforced insulation technology, which is applied in the shape/style/structure of winding insulation, can solve problems such as damage to the insulation system, and achieve the effects of low cost, increased operational reliability, and obvious effects.
Active Publication Date: 2009-11-04
SHANGHAI ELECTRICAL APP RES INST GRP +1
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Problems solved by technology
Low-voltage high-power variable-frequency three-phase asynchronous motors have been widely used in various industries, but in the process of popularization and application, it was found that there were a large number of premature damages to their insulation systems
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Embodiment Construction
[0012] refer to figure 1 , which is a schematic diagram of the reinforced insulation structure winding of the present invention.
[0013] As shown in the figure, 6 is the insulating sleeve, and 7 is the lead-out wire of the winding. When the motor stator is embedded in the winding, the insulating sleeve 6 with the same heat resistance grade as the motor thermal classification is selected. The diameter of the selected sleeve should be the same as that of the motor lead-out. The length of the casing is equivalent to that of the motor stator core.
[0014] Before the winding wire is embedded, put the insulating sleeve on the two lead-out wires of the winding (the sleeve can also be put on the lead-out wire in advance when winding the wire), and after the first coil of the winding is embedded into the slot, then put the The first-turn insulating sleeve is gradually pushed into the stator slot along the lead-out line until the length of the straight line part in the core slot shou...
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The invention relates to a reinforced insulation structure applied to a low-voltage variable frequency motor random winding, wherein same heat-resistant grade insulating sleeves are selected from the head turn and the tail turn of the winding and are sleeved on two leading-out wires of the winding; and after the first coil is embedded and is pushed into a slot, the sleeved head turn insulating sleeve is gradually pushed into a stator slot along the leading-out wires; and the length of the diameter of the insulating sleeves is more than 1 / 3 of that of an iron core. The reinforced insulation structure has a process that before the winding is embedded, the insulating sleeves are sleeved on the two leading-out wires of the winding, or the sleeves can be pre-sleeved on the leading-out wires during winding; when the first coil is embedded and is pushed into a slot, the sleeved head turn insulating shelve is gradually pushed into the stator slot along the leading-out wires until the length of the straight line part of the head turn insulating sleeve getting into an iron slot is more than 1 / 3 of that of the iron core, and then other coils of the winding are embedded; and when the tail turn of the last coil of the winding is embedded and is pushed into the slot, the same process is adopted to push the insulating sleeves into the slots of the coils along the leading-out wires.
Description
technical field [0001] The invention relates to a reinforced insulation structure, in particular to the reinforced insulation structure of the stator loosely embedded in the first and last turns of the winding of a low-voltage high-power variable-frequency motor. Background technique [0002] With the development of power electronics technology, AC frequency conversion speed regulation technology has also been continuously improved and improved. Low-voltage high-power variable-frequency three-phase asynchronous motors are widely used in all walks of life, but in the process of popularization and application, it is found that there are a large number of premature damages to their insulation systems. This is because the voltage waveform output by the inverter is different from the sinusoidal waveform of the power frequency voltage. The voltage output by the inverter is a pulse square wave with extremely fast rising and falling edges, and the voltage rise rate dv / dt is quite hi...
Claims
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Inventor 戎伟康张凤陈琳
Owner SHANGHAI ELECTRICAL APP RES INST GRP