3.1.3.6 Power Limit
3.1.3.6.1 Overview
In case the DC power supply of the Drive has limited output power (for example limited output I at a certain
V level) this feature can be used to make sure that the output power drawn from the power supply is
limited.
Use case: Battery powered system
A good example of such cases are applications where batteries are used, and their output currents
should remain below a certain limit.
This feature does not measure the mechanical torque directly. Instead it is using the “computed electrical
torque” and assumes that the “computed electrical torque” is equal to the real generated mechanical torque
of the motor.
It calculates the rotational speed of the motor with values from the position sensor at the motor shaft.
DC
DC
3.1.3.6.2 Requirements
This feature works in CST, CSV, CSP, PT, PV and PP modes.
The following parameters must be properly set from the motor datasheet:
Motor torque constant
Position sensor configurations
Number of pole pairs
3.1.3.6.3 Detailed Description
Mechanical output power of the Drive in any condition is equal to:
where “τ” represents “Torque”, and “⍵ represents the “rotational speed”.
At any operational point, the Drive has access to rotational speed. As a result the limit of generated torque can
be calculated as:
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