Uploaded April 2017 | Updated September 2026, 3 weeks ago

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Magnetic Field of ebike a hubmotor QS205 50H 4T.

Gaussmeter is from ebay, model TD8620.

Motor is QS205-50H 4T

state of magnets: before restauration, was damaged by rust and maybe temp but impossible to tell as no temp sensor was connected by the owner.

The magnets type are 35HS and specs are these:

note from the mabnufacture:
"Note: QS Motor could work 120 ℃ in half an hour without damage.
Conservative Suggestion (Setting of Controller)
When it's 130 ℃ inside of motor (in 30s), the current should be limited 50%.
When it's 150 ℃, the controller shut down.
When it drop down to 110℃, the controller work again."