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youngken
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Rotational speed of an electric screw jack

08/17/2022 8:47 AM

Is the rotational speed or translational travel speed of an electric screw jack always be a constant value in both loading or unloading conditions?
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SolarEagle
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#1

Re: Rotational speed of a electric screw jack

08/17/2022 12:08 PM

Depends on the design...

https://www.nookindustries.com/resources/blog/archive/8-design-considerations-for-screw-jack-systems/

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Brave Sir Robin
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#2

Re: Rotational speed of a electric screw jack

08/17/2022 1:00 PM

It will be if the motor can be driven at a constant speed regardless of the torque requirement.

For instance, if a permanent magnet synchronous motor (PMSM) is driven by an inverter (motor drive) and it can be programmed to operate at a constant RPM (within the torque limitations of the motor of course), then yes, the screw jack speed will be constant.

An AC induction motor speed varies somewhat over no-load to full-load conditions.
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phoenix911
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#3
In reply to #2

Re: Rotational speed of a electric screw jack

08/17/2022 10:04 PM

A closed loop Servo.

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youngken
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#4
In reply to #2

Re: Rotational speed of a electric screw jack

08/17/2022 10:21 PM

For a PMSM is driven by an inverter and it can be programmed to operate at a constant RPM, is the power consumption will be affected by loading or unloading?
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Tornado
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#5
In reply to #4

Re: Rotational speed of a electric screw jack

08/17/2022 10:35 PM

Yes.

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Brave Sir Robin
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#6
In reply to #5

Re: Rotational speed of a electric screw jack

08/19/2022 1:04 PM

Something about the Law of Conservation of Energy.

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