8V is missing throughout the wire resistance ( V = I × R ) which has a existing of 311mA. The motor isn't going to care with regards to the voltage, only The existing. and this is the first parameter in all calculations. Although we have been constrained by transformers which can be intended to offer a specified voltage, Fortuitously It is simple to work this when we know how.
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There's a small complication, in the Hammond employs the stray AC magnetic field to operate the alarm buzzer, but This could not have an effect on the ultimate consequence.
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Before the new coil is wound, we'll want for making a former. Due to the minimal voltage utilised, Just about any offered content are going to be great. Suited selections are significant density cardboard (not corrugated), slim fibreglass or other plastic, fibreboard, and so forth. There is nothing critical about the former, only that it will fit around the motor laminations and is powerful adequate to remain jointly although The brand new coil is wound.
This motor hasn't been rewound - and it may not be, as it is a great example for demonstration into the attendees on the 'Electrical Horology Shorter Study course' that was operate for NAWCC Chapter seventy two for the duration of 2008. Because it looks probable which the study course will operate all over again, I want demonstration motors.
seven Electrical power Dissipation Actual electric power dissipation can only be established once the coil is wound. An exceptionally rough approximation can be achieved now although - this tends to reveal When the wire sizing is too smaller, which can induce too much dissipation. The examination coil experienced a calculated resistance of one.
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The 10-turn system explained in this article is obviously much easier to wind, but involves bigger measurement more info precision. You could use more turns if you prefer, but make sure to maintain the resistance to some bare minimum.