Editing Phasing a.k.a. phase search
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#By driving current to windings and letting motor to settle to certain magnetic angle | #By driving current to windings and letting motor to settle to certain magnetic angle | ||
#By utilizing absolute feedback device, such as Hall sensors or resolver, to give all needed information directly | #By utilizing absolute feedback device, such as Hall sensors or resolver, to give all needed information directly | ||
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The first method induces small motion during drive power-up as windings pull nearest magnets towards them. The maximum amount of motion is +/-90 degrees of magnetic pitch, i.e. for 4 pole motors the physical motion angle stays within +/-45 degrees from the initial angle. This method typically consumes few seconds of time before motor is operational. This method has pros and cons: | The first method induces small motion during drive power-up as windings pull nearest magnets towards them. The maximum amount of motion is +/-90 degrees of magnetic pitch, i.e. for 4 pole motors the physical motion angle stays within +/-45 degrees from the initial angle. This method typically consumes few seconds of time before motor is operational. This method has pros and cons: | ||
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**High torque applied to motor while phasing is in progress (such as vertical axis) | **High torque applied to motor while phasing is in progress (such as vertical axis) | ||
**Blocked motion (motor can't freely rotate) | **Blocked motion (motor can't freely rotate) | ||
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− | + | The second method gives the needed magnetic angle info directly to drive and no motion is needed to determine the rotor angle. This method allows instant power-up of motor without any induced motion or delay. | |
;Pros | ;Pros | ||
*Instant power up of motor | *Instant power up of motor | ||
*No motion from start position needed | *No motion from start position needed | ||
− | *Insensitive to external conditions | + | *Insensitive to external conditions |
;Cons | ;Cons | ||
*More wiring and more parts that may malfunction | *More wiring and more parts that may malfunction | ||
*Not well standardized in industry (hall sensors may not be similarly aligned in different motors, causing difficulties when utilizing them with servo drive) | *Not well standardized in industry (hall sensors may not be similarly aligned in different motors, causing difficulties when utilizing them with servo drive) | ||
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