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Main Motor Control - Brother NX600 Service Manual

Computerized sewing machine.
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Outline of Mechanism Main motor control
The sewing machine motor must run stably at low speeds and high speeds even with load temperature and other
changes. Therefore, the main motor is run by PMW control that makes use of FETs.
Motor voltage waveform
Low speed
Middle speed
High speed
1 - 6
Approx. 50 µsec.
Power on area
Fig. 1 Outline of pulse width modulation (PWM) control

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