9. SPECIFICATIONS
9－7
(1) When the motor repeats a constant-speed status and a stop status
When the operating state is as in Fig. 9-2, use the motor at a frequency in which the effective motor
armature current effective value is at the motor rated armature current (I
R) or lower.
Supposing the operating cycle is t, the usable range is represented in the following expression.
t ≧ [s]
When the cycle time (t) has already been determined, find I
P
, t
a
and t
b
satisfying the above expression.
Fig. 9-2 Motor Current and Speed Timing Chart
I
P
2
(t
a
+ t
b)
+ I
L
2
t
S
I
R
2
I
P
: Instantaneous maximum stall
armature current
I
R
: Rated armature current
I
L
: Current equivalent to load torque
When actually determining the system driving mode, you are recommended to limit
Trms ≦ 0.7T
R
approximately, making allowance for load.
I
P
t
a
t
s
−I
P
t
b
t
I
L
Motor current
→ Time
Motor speed
→ Time
N
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