How To Judge The 20 Slots Heating Motor Armature
With four aspects
1. Bar to Bar resistance,0.01mΩ~10mΩ (Out of range display OVER)
Four-terminal measurement to ensure accuracy
2. Welding resistance,0.001mΩ-10mΩ (Out of range display OVER)
Six-terminal measurement to ensure accuracy
3. Cross resistance 0.01mΩ-10mΩ
Four-terminal measurement to ensure accuracy
4. Surge 100-1000V (100V/time)
Pulse crest:0.5u sec, Frequency 1~40MHz
Standard waveform is Write, OK waveform is Green, NG waveform is Red
5. Isolation resistance DC 500V
Testing time:1~10s (0.1s/time)
Range:1~500MΩ
Accuracy: ≤±5%
6. Hipot AC 100-1000V
Testing time:1~10s (0.1s/time)
Armature commutator bars ≤ 36 bars
Testing panel cycle time: 8~9s (according to 33 bars)
Motor Manufacturer Question and Wind Automation Answer
Motor Manufacturer K from Turkey
During welding resistance measurements on a 20-bar commutator, I generally obtain values between 0.02 mΩ and 0.04 mΩ. However, occasionally, I encounter values around 0.3 mΩ on some commutator bars.
Could you please advise what the maximum acceptable welding resistance should be in such cases? For instance, would setting a maximum limit of 0.1 mΩ be appropriate?
How can we calculate or define a proper threshold for this parameter?
Wind Automation Reply
The maximum acceptable welding resistance would setting a maximum limit of 0.1 mΩ is appropriate,
When the welding resistance is 0.3mΩ , the motor will be risk of burning which is caused by high current as a high resistance,
Thank you very much for the valuable information you have provided.
We truly appreciate your prompt and helpful support.
We would be pleased to collaborate with you in our future projects and look forward to building a strong working relationship.
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