New answers tagged motor
2
votes
Deboucing a BEMF in BLDC motor control
If bldc_step does indeed vary from 1 to 6 (or actually 0 to 5, from reading the code), then bldc_step & 1 is only true for ...
- 3,002
0
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Deboucing a BEMF in BLDC motor control
For motor debounce from deadzone flyback or Back EMF , in the provided code, debouncing ensures stable detection of back electromotive force (BEMF) signals, critical for determining rotor position. ...
- 148k
0
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Confusion regarding a 12V DC motor's RPM
Maybe not helpful anymore, but are you absolutely sure that the 550 rating is not the RPM at load rating? 550 RPM is very common for 12v DC motors, which would bring your final RPM down to 5.5 based ...
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1
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Why is it safe to soak an electric motor in isopropyl alcohol but not distilled water?
It's hard to get it dry
It is exactly as your quote says: very difficult to remove the water from tight places. Isopropyl alcohol evaporates at lower temperatures, and even if there is some left ...
- 9,656
2
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Why is it safe to soak an electric motor in isopropyl alcohol but not distilled water?
When a motor get wet it needs to be baked to remove any water. If it doesn't fit in the oven build an enclosure with a milkhouse heater to flash off any water in or on the motor internals.
Distilled ...
6
votes
Why is it safe to soak an electric motor in isopropyl alcohol but not distilled water?
I would never use water to clean an electric motor, even if the water were distilled. Distilled water, as soon as it mixes with the dirt on the motor will no longer be 100% pure, i.e. "distilled&...
- 27.8k
0
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Why do motor controller inverter sections use decoupling capacitors of a single value?
There's several reasons to use only one primary value.
0.1uF is 'good enough' for most applications
0.1uF hits a sweet spot for bypassing, doing a decent job in the 1-100Mhz region. More here: Where ...
- 58.2k
5
votes
Why is it safe to soak an electric motor in isopropyl alcohol but not distilled water?
You can use pure distilled water to run the motor for a short time (and you can also do this with your PC) The problem is you can't keep the water clean and ions will creep into the solution, make it ...
- 88.8k
0
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Why do motor controller inverter sections use decoupling capacitors of a single value?
An inverter bypass application demands low impedance at up to modest frequencies, typically mid 10s of MHz. But it can extend up into the 100s MHz, particularly for modern transistors driven hard, or ...
- 45.6k
22
votes
Why is it safe to soak an electric motor in isopropyl alcohol but not distilled water?
Is it safe to waterlog electric motors in distilled water?
For a short time? A qualified yes. Otherwise - no. There are two problems:
galvanic corrosion between dissimilar metals,
corrosion of mild ...
3
votes
Accepted
Trapezoidal shape of signals in BLDC motors
Only two phases are driven at one time, the third phase is "Hi-Z" or "Off". You will also notice that only one change is made between each "sector" (as named in your ...
- 3,002
3
votes
Trapezoidal shape of signals in BLDC motors
The trapezoid shape refers to the back EMF, not the driving voltage.
In your photo, the blue phase is driven "high" to VDC; the green phase is driven "low" to 0V, and the red phase ...
- 850
1
vote
Accepted
How to calculate or select capacitor value for this H-bridge?
It depends on what you're doing with the motor.
If all the MOSFETs in the H-bridge are off, and the motor is turning, then it will act as a generator. The MOSFET body diodes will act as rectifiers, ...
- 81.6k
0
votes
BLDC motor current sensing for load torque
This is our code for RPM display when we pass wing of BLDC motor through optocoupler:
...
1
vote
Compact Low RPM Motor
Probably not, unless you're shopping in the wrong catalogs.
An electric motor is limited by physics. At the low-speed torque end of the performance envelope, the physics involved are the strength of ...
- 47.1k
0
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Am I able to ignore R_Boot in Bootstrap circuit? Using UCC27710
The bootstrap resistor can slow turn-on of the high side FET, which can reduce switch node ringing. It will also limit peak current in the capacitor.
You should be able to calculate a value that ...
- 24.7k
0
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Connect ring terminal to PCB (low profile)
Oof, 14.7N-cm on the TH-1.6-M 2 is almost nothing.
You can try adding lock or spring washers.
There are also chemical threadlockers you can evaluate, however when ...
- 24k
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