All Questions
8 questions
3
votes
1
answer
514
views
Why does a Hall sensor use a solid magnet?
I have disassembled two motor circuits that use a Hall sensor. One is a cooling fan blower and the other is a 230 VAC motor.
The blower has a brushless motor and has its Hall sensor on the stator ...
- 191
0
votes
0
answers
221
views
How to test if a motor's magnets are demagnetized?
I have a motor in front of me which I'm fixing because a magnet came unglued. I was given it by someone else so it's unclear why the magnet glue failed. It could have been from heat, speed, or just a ...
- 786
2
votes
1
answer
244
views
Problems of optimal commutation depending on number of pole
I am trying to design a three phase 4 pole motor, control with six-step. My problem appears when I draw the commutation to try to see how everything work. First, with a basic three phase 2 pole, there ...
- 21
0
votes
2
answers
168
views
How to prevent external magnet rotate a motor
A small dc motor working and moving a disc. When device/motor is power off, a hacker with a strong magnet came and rotate the motor; without touching the motor, just moving the magnet near the motor ...
- 1
0
votes
2
answers
779
views
Permanent magnet in ac motor
Is Magnet in pmac motor degrade while they are in use because in tesla model 3 they uses pmac motor so we have to replace magnet frequently ?
0
votes
1
answer
882
views
Can two magnets damage or interfere brushless motor?
I want to get the absolute position of motor shaft, so I have added two magnets on the metallic thread (which holds the motor) and some hall sensors on top of shaft.
Can the magnets in some way ...
- 65
2
votes
1
answer
2k
views
Modelling a "single-phase permanent split-capacitor motor" in LTspice
I'm planning to use an AC fan in an LTspice simulation.
The AC fan is made up of a single-phase permanent split-capacitor (PSC) motor.
Here is the actual fan: http://uk.rs-online.com/web/p/axial-fans/...
- 12.2k
0
votes
2
answers
1k
views
What permanent magnet motor is the best for the bike generator? How to decide about wattage?
I am new here.. I would like to build my bicycle generator with permanent magnet motor similar to this one Bicycle Power Basics
Basically, I want to run my pedal cinema with a bike generator. I am ...
- 1