Description
Raw material
Commutator bars : copper
Insulation between bars: mica
Moulding compound: phenolic
Reiforced rings: steel or fiber glass
Bushings: Brass,steel metal material
Chief Techical Parameters
Name of the parameter | Specifications of commutator | Technical parameter | |
Overspeed test | O.D less than 25.5mm | ROOM temperature:44000RPM,after 10min ,running ,deviation between segments≤0.003,O.D change≤0.007mm | |
Heating 250℃44000RPM,after 10min ,running ,deviation between segments≤0.003,O.D change≤0.007mm | |||
O.D 25.5mm-28.5mm | ROOM temperature:44000RPM,after 10min ,running ,deviation between segments≤0.003,O.D change≤0.007mm | ||
Heating 250℃38000RPM,after 10min ,running ,deviation between segments≤0.003,O.D change≤0.007mm | |||
O.D 28.5mm-32.5mm | ROOM temperature:37000RPM,after 10min ,running ,deviation between segments≤0.003,O.D change≤0.010mm | ||
Heating 250℃35000RPM,after 10min ,running ,deviation between segments≤0.003,O.D change≤0.010mm | |||
O.D 32.5mm-38.5mm | ROOM temperature:34000RPM,after 10min ,running ,deviation between segments≤0.003,O.D change≤0.010mm | ||
Heating 250℃32000RPM,after 10min ,running ,deviation between segments≤0.003,O.D change≤0.010mm | |||
Insulation withstanding test | Various specification | Room temperature: between shaft hole and commutator segment≥150MΩ | |
Heating:140℃ within 1h , between shaft hole and commutator segment≥100MΩ | |||
I.D tolerance of commutator | Various specification | With bushing H7 | Without bushing H8 |
Inclination of commutator segment | Various specification | □≤1/3Nominal insulating thickness between the segment of coummtator | |
AC frequency | Various specification | 50HZ | 60HZ |
Note:
1、The volage-withstanding test’s date between the shaft and the segment of commutator and between the segments depends on the different motor application and different customers’ requirements.
2、Negotiation may be taken if customers have other special requirements to the above date in the table.
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