The reason we are using a retaining sleeve is due to the fact that the rotor magnets are secured to the steel hub of the rotor by locitie. The locitie bond is only as good as the application process is. The motor is only running in the 600 rpm range but the locitie bond failed after thermal...
What could be the effects of adding a thin 303 to 316 stainless steel sleeve to retain the rotor magnets in a BLDC motor? What would be the best material to use for this sleeve to avoid affecting motor Kt?
Skogsgurra,
Thanks for your suggestation. We need to measure both radiated and conducted emissions, so we are looking now at a magnetic particle brake. Are these brakes reversible?
We are trying to develop a load for a wiper motor being tested for radiated emmissions and susceptibility. Presently we use a full size windshield upon which a layer of taclum power is applied to simiulate worst case friction. The wiper motor drives the wiper across the window to its full...
We have a 24V BLDC motor that requires low cogging and torque ripple. We designed a motor with a 15 slot/4 pole configuration with the rotor magnets skewed by one slot (approx. 6 degrees). After testing two samples with a marked reduction in ripple, we made 25 more and shipped them to our...
Thanks for all the input. I would think that skewing the laminations would be easier to develop instead of skewing the magnets that would require more design work. Are there existing skewed magnets sized for the rotor body OD and length?
Yes, skewed laminations means skewed slots. Sorry if I didn't make that clear. The amount of skew is .86 to 1.0 stator tooth.
To answer another question - this motor is a NEMA 23 frame size and has a peak torque of 2.3Nm (through a gearbox) with an averge torque of 0.23Nm.
I have a 24VDC BLDC servo motor that we are using for a force feedback application. One of the critical requirements is that there be as little cogging/torque ripple as possible. This is a 3 phase sinusoidal controlled motor.
We are testing a 12 slot/4 pole design now but would like to know...
I'm using a 24V 3 phase BLDC servo motor with trapezoidal commutation to provide force feedback to a steering wheel. Torque should be greatest when the angle between the steering wheel centerline and the machine centerline is maximum (cranking the wheel for a hard turn). Since torque and...
Stator winding temperature was not measured during the particular test, but it was measured in other tests and was considerably cooler than the rotor (only copper losses as expected).
I ran a test to determine if any mechanical losses are significant contributors to the increased rotor temperature on a BLDC motor used for research projects. Another motor was connected to an unpowered BLDC motor with plastic material coupling. The motor was spun at about 2000rpm for 5...
We're having trouble with sloshing impact damaging the fuel level sender (missing float arms, bent supports or supply tubes, inaccurate readings, etc.) in large tanks used in off-highway equipment. Most of the tanks are steel, baffled, with tri-angular corner supports based on pre-existing...
This 12VDC PM motor is part of a fuel pump assembly. Changes were made to the motor brush clearance when it was originally in a 12 volt system. This improved motor life 15X (15k hours). This motor/fuel pump assembly was then adapted to work in a new 24 volt system by providing a 24 volt...
Is measuring induced EMF in a 12 VDC PM motor a good way to measure motor performance? I have sketchy info for now, but we have a customer using a 12 VDC PM motor with voltage dropped down from a 24 VDC system. Brush life has dropped from 1000 hours to less than 100. Improvements were made to...
