CHAPTER 15 APPENDIXES

(6) Creating the torque pattern

Create the pattern of the output torque according to the operation pattern.

・Operation pattern

Travel

speed

・Torque pattern

Output

torque

TAC: Acceleration torque

tDC

TL: Load torque

tAC

tL

tcyc

TDC: Deceleration torque

Time

Time

(7) Calculating the effective torque (Trms)

Calculate the effective torque of each cycle of the operation pattern.

Trms =

(TAC2 × tAC) + (TL2 × tL) + (TDC2 × tDC)

tCYC

Obtain the sum of each of the product of the squared output torque multiplied by the output time

and divide the sum by the cycle time, and obtain the square root of the result.

(8) Trms ≤ TR

If the effective torque is equal to or smaller than the rated torque, continuous operation in the

designated operation pattern is possible.

15

15-22 Capacity Selection Calculation