Motor whine/hum at low voltage
09-13-2007, 01:23 PM
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Motor whine/hum at low voltage
I have 2 Dumas motors that have a low whine at very low voltage and the motors do not turn, this is when the batteries are almost dead, is this normal, thanks, Randy.
09-14-2007, 05:10 AM
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RE: Motor whine/hum at low voltage
Yes.
The windings are working to move the armature against the effect of the magnet, but due to low power are not making it to the point where the next coil takes over and rotates the armature. As the battery voltage drops further, the noise will reduce. Best idea is to recharge the battery.
The windings are working to move the armature against the effect of the magnet, but due to low power are not making it to the point where the next coil takes over and rotates the armature. As the battery voltage drops further, the noise will reduce. Best idea is to recharge the battery.
09-14-2007, 08:17 AM
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RE: Motor whine/hum at low voltage
hansvonpensch,
Yes, it's 'normal' to some extent, just depends on the particular motor. 'mfr02' is right, when you start hearing that particular noise it's time to change/recharge the batteries. It also sort of depends on how much 'binding'/friction that's internal to that particular motor. Lots of variations there, and probably no two motors will 'sound' the same, sort of. Pay attention to the other 'clues' as to motor condition, as in heat build up, vibration, etc, etc. Most electric motors tend to be quiet, normally, sort of, kind'a. When they aren't, take a good look at the whole system... sort of. (Terrible answer, isn't it?)
- 'Doc
Yes, it's 'normal' to some extent, just depends on the particular motor. 'mfr02' is right, when you start hearing that particular noise it's time to change/recharge the batteries. It also sort of depends on how much 'binding'/friction that's internal to that particular motor. Lots of variations there, and probably no two motors will 'sound' the same, sort of. Pay attention to the other 'clues' as to motor condition, as in heat build up, vibration, etc, etc. Most electric motors tend to be quiet, normally, sort of, kind'a. When they aren't, take a good look at the whole system... sort of. (Terrible answer, isn't it?)
- 'Doc
09-14-2007, 11:41 AM
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RE: Motor whine/hum at low voltage
This also has to do with the ESC.
Some ESC operate on frequencies that cause the motors to whine at low speed.
Vantecs commonly cause the motors to whine, or hum at low speed.
Some ESC operate on frequencies that cause the motors to whine at low speed.
Vantecs commonly cause the motors to whine, or hum at low speed.
09-14-2007, 12:01 PM
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RE: Motor whine/hum at low voltage
My Viper and Marine esc's from mtroniks also cause the motors to shine at low RPM, this fades away as the RPM increases, replaced by the motors own purr.
Do not worry about the whine, its all perfectly normal, jusy recharge the batteries and relax.
basically in simple terms, after all im no electronic expert at all, your esc, running of a 12v battery for example spins the motor by varying the number of pulses per second, the higher the rate the faster the spin, its the pulse rate that causes the whine
20 pulses per second 200 rpm 200 pulses per second 2000 rpm
please note, the numbers used to explain it are merely numbers, and are not an exact representation of the electrical performance of the esc's It just makes it easier to explain things!!
Do not worry about the whine, its all perfectly normal, jusy recharge the batteries and relax.
basically in simple terms, after all im no electronic expert at all, your esc, running of a 12v battery for example spins the motor by varying the number of pulses per second, the higher the rate the faster the spin, its the pulse rate that causes the whine
20 pulses per second 200 rpm 200 pulses per second 2000 rpm
please note, the numbers used to explain it are merely numbers, and are not an exact representation of the electrical performance of the esc's It just makes it easier to explain things!!
