Desertprep
1 kW
I have seen this mentioned dozens of times in the past week...I searched on it in the forum and only found instances of the word and not a definition. What does it mean?
Sync problem?
- Thread starter Desertprep
- Start date
recumpence
1 GW
This is refering to a sensorless controller "Losing it place" with the motor rotor. Basically, a sensorless controller reads the magnetic pulses sent back to from motor between power pulses. This is refered to as Back-EMF". The back EMF tells the controller which windings in the motor need to be engergized. However, some controllers and some motors do not communicate well with each other. This lack of communication makes the motor sound very odd, reduces power, and is terrible on the controller. It normally occurs with poorly matched components under very heavy load at low RPM and high throttle settings.
Anyway, that is what "Losing sync" is referring to.
Matt
Anyway, that is what "Losing sync" is referring to.
Matt
Hillhater
100 TW
If you look at the 3 videos at the bottom of page 3 on Oatnets build thread ..
http://endless-sphere.com/forums/viewtopic.php?f=28&t=21309&start=30
..you will see the drive "jump" and stop when he starts it....That is the drive losing sync.
http://endless-sphere.com/forums/viewtopic.php?f=28&t=21309&start=30
..you will see the drive "jump" and stop when he starts it....That is the drive losing sync.
Desertprep
1 kW
is there some characteristic of motors and/or controllers that are likely to loose sync? Without hall sensors, I still do not understand how a controller can know "where an ourtrunner motor is", in terms of being synced.
If you add hall sensors to an outrunner motor, if you have twice as many sensors is the power setup less likely to have sync problems?
If you add hall sensors to an outrunner motor, if you have twice as many sensors is the power setup less likely to have sync problems?
Desertprep
1 kW
so is syncing a momentary problem? Does it cause permanent damage to either the motor, controller and/or battery? Is it like the motor is hiccuping?
spinningmagnets
100 TW
Pengyou, when a brushless RC motor is still in its factory configuration, it has no sensors or brushes for the controller (ESC) to tell what the rotor position is. the rotor jiggles back and forth, and starts to move in the correct direction, then it "takes off". All of this takes place in milliseconds and is pretty invisible to the naked eye.
A "sensorless" controller (like most ESC's) can sense the electromagnetic field that is generated in the wiring as it pulses from a magnet moving near it. From that, it tries to figure out when to turn on-and-off the power to each of the stator-coils. "back-EMF" is the Electro-Magnetic-Field.
http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=4691
"...TURNIGY Sentilon 100A HV 5-12S Speed Controller (Version 4)
The Sentilon 100A HV can handle 12 lipoly cells in series, thats 36 NiMH cells!
This BESC owes its high voltage ability to the USA imported Fairchild MOSFets used and high quality compnentry.
Now with an ultra-fast 12Mhz CPU. Faster clock cycling preventing sync loss with some large motors*Warranted for 12 months, the Sentilon series BESCs are guaranteed against faulty manufacturing and poor quality components.
Cont Current: 100A
Burst Current: 110A
BEC Mode: N/A (no BEC)
Lipo Cells: 5-12
NiMH : 15-36
Weight: 125g
Size: 60x60x11mm
CPU Clock Speed: 12Mhz
WARNING: For some large motors, you must use High timing mode. Failure to do so will result in a burnt esc.
A "sensorless" controller (like most ESC's) can sense the electromagnetic field that is generated in the wiring as it pulses from a magnet moving near it. From that, it tries to figure out when to turn on-and-off the power to each of the stator-coils. "back-EMF" is the Electro-Magnetic-Field.
http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=4691
"...TURNIGY Sentilon 100A HV 5-12S Speed Controller (Version 4)
The Sentilon 100A HV can handle 12 lipoly cells in series, thats 36 NiMH cells!
This BESC owes its high voltage ability to the USA imported Fairchild MOSFets used and high quality compnentry.
Now with an ultra-fast 12Mhz CPU. Faster clock cycling preventing sync loss with some large motors*Warranted for 12 months, the Sentilon series BESCs are guaranteed against faulty manufacturing and poor quality components.
Cont Current: 100A
Burst Current: 110A
BEC Mode: N/A (no BEC)
Lipo Cells: 5-12
NiMH : 15-36
Weight: 125g
Size: 60x60x11mm
CPU Clock Speed: 12Mhz
WARNING: For some large motors, you must use High timing mode. Failure to do so will result in a burnt esc.
