Quartz Watch Stepping Motor Magnets – This product is mainly applied in quartz watch stepping motor, which can be made of different kinds of materials such as SmCo5 or NdFeB according to the customers’ requirements.
Materials Selection:
Various kinds of permanent magnetic materials can be selected, such as SmCo5, Sm2Co17, or NeFeB.
Inside a quartz clock or watch, the battery sends electricity to the quartz crystal through an electronic circuit. The quartz crystal oscillates (vibrates back and forth) at a precise frequency: exactly 32768 times each second. The circuit counts the number of vibrations and uses them to generate regular electric pulses, one per second. These pulses can either power an LCD display (showing the time numerically) or they can drive a small electric motor (a tiny stepping motor, in fact), turning gear wheels that spin the clock’s second, minute, and hour hands.
In theory, it works like this:
Battery provides current to microchip circuit
Microchip circuit makes quartz crystal (precisely cut and shaped like a tuning fork) oscillate (vibrate) 32768 times per second.
Microchip circuit detects the crystal’s oscillations and turns them into regular electric pulses, one per second.
Electric pulses drive miniature electric stepping motor. This converts electrical energy into mechanical power.
Electric stepping motor turns gears.
Gears sweep hands around the clockface to keep time.
In practice…
And this is what the inside of a quartz watch looks like in reality. Don’t, under any circumstances, take yours apart if you ever want it to work again. You cannot see all these parts just by taking the back off a watch. The watch shown here came free with a packet of cornflakes (seriously!) and it was broken before I opened it up. But it was even more broken afterwards…
Size Range and Limits Deviation
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Item
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Outer Diameter
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Hole Diameter
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Height
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Direction of Magnetization
|
|
Size Range
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φ0.8—φ2.0
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φ0.3—φ1.0
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0.3—1.0
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Axial
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Limits Deviation
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±0.005—±0.03
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+0.015—+0.05
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±0.005—±0.02
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±1°
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Standard Sizes
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External Diameter. mm
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Internal Diameter. mm
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Height. mm
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External Diameter. mm
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Internal Diameter. mm
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Height. mm
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|
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1.0
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0.3
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0.5
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1.0
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0.44
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||
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1.25
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0.35
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0.45
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1.1
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0.355
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||
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1.29
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0.35
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0.45
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1.2
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0.4
|
||
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1.5
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0.4
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0.37
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1.6
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0.43
|
||
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1.9
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0.6
|
0.7
|
1.9
|
0.7
|
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