Post by johnbalich on Sept 15, 2009 16:10:12 GMT -7
Do they require more amps?? Maybe. If you have adequate amps, a motor will draw what it requires.
What I mean is, if one arm wants to see 1 amp and another arm wants to draw two amps, and you have 3 amps on hand, both arms will be fine. The lower impedance arm will draw more current, all other things being equal, and produce more power.
Let's look at case two: One arm wants one amp, and another arm wants two amps and you have a power supply capable of 1 amp. The Two amp arm (lower impedance, that is) will have no advantage. As the current draw approaches the power supply limits, voltage will drops, and the arm doesn't see any benefit.
So the real question is how many amps do you have on hand?
There are other variables that can affect performance, beyond JUST impedance. Balance, both electrical and mechanical, can have a beneficial or detrimental effect on a given arm. Straightness of shafts, roundness of shafts, defects in top plates etc etc. These things produce such tiny fractions of a horsepower, that the smallest defects can have dramatic results.
All things being equal, a lower impedance arm SHOULD be more powerful than a higher impedance arm, but it ain't ALWAYS so.
Another factor to look at, is magnet strength. A lower impedance arm will normally see better benefits with a stronger magnet. A very strong magnet with a "weak" arm may yield negative results and vice versa. Confused now? Last thought: when in doubt, believe the timing clocks, not the armature specs.
What I mean is, if one arm wants to see 1 amp and another arm wants to draw two amps, and you have 3 amps on hand, both arms will be fine. The lower impedance arm will draw more current, all other things being equal, and produce more power.
Let's look at case two: One arm wants one amp, and another arm wants two amps and you have a power supply capable of 1 amp. The Two amp arm (lower impedance, that is) will have no advantage. As the current draw approaches the power supply limits, voltage will drops, and the arm doesn't see any benefit.
So the real question is how many amps do you have on hand?
There are other variables that can affect performance, beyond JUST impedance. Balance, both electrical and mechanical, can have a beneficial or detrimental effect on a given arm. Straightness of shafts, roundness of shafts, defects in top plates etc etc. These things produce such tiny fractions of a horsepower, that the smallest defects can have dramatic results.
All things being equal, a lower impedance arm SHOULD be more powerful than a higher impedance arm, but it ain't ALWAYS so.
Another factor to look at, is magnet strength. A lower impedance arm will normally see better benefits with a stronger magnet. A very strong magnet with a "weak" arm may yield negative results and vice versa. Confused now? Last thought: when in doubt, believe the timing clocks, not the armature specs.