GSK DA98D - Order Instructions; Capacity Selection; Electronic Gear Ratio

DA98D User Manual
65
Chapter Nine Order Instructions
9.1 Capacity Selecting
The determination of capacity of the servo system must comprehensively consider factors like
load inertia, load torque, required positioning precision and maximal speed. The following
steps are recommended for the considerations:
1） Calculating Load Inertia and Torque
By referring to related data, make a calculation on load inertia, load torque,
acceleration/deceleration torque and effective torque, which will serve as the basis for
choice at the next step.
2） Initial Determination of Machinery Gear Ratio
According to the required maximal speed and rotation rate of motor, make a calculation
on the maximal machinery deceleration ration. This ratio and the minimal gyration unit of
motor will be used to calculate whether the requirement for minimal position unit is
satisfied. If a relatively high position precision is required, increase the machinery
deceleration ratio (the actual maximal speed is decreased) or choose motor with higher
rotation rate.
3） Calculating Inertia and Torque
The load inertia and torque can be converted to the motor shaft with machinery
deceleration ratio. The converted inertial shall be no more than 5 times of the inertia of
the motor rotor and the converted load torque and effective torque shall be not higher
than the rated torque of motor. If these requirements cannot be satisfied, increase
machinery ratio (the actual maximal speed is decreased) or choose motor with greater
capacity.
9.2 Electronic Gear Ratio
Refer to Chapter Four (Table 4.2 Functions of Parameters), Chapter Six (Parameter Setting)
and Chapter Seven (7.3 Adjustment) for the meaning and adjustment of electronic gear ratio
G.
Under position control mode, the actual speed of load is:
command pulse speed×G×machinery deceleration ratio.
Under position control model, the actual minimal displacement of load is:
minimal command pulse itinerary×G×machinery deceleration ratio.
Note: When the electronic gear ratio G is not 1, the dividing operation of G may have a