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Servo drive: EL8-EC750F, Servo Motor: ACM2-08008H2. When T = 2s, rotational velocity
= 3000rpm, load inertia is 5 times of motor inertia.
EL8-EC Drivers
750W
ACM2-08008H2
Regenerative energy produced:
E1 =
If E1<Ec, internal capacitors can't take in excessive regenerative energy, regenerative
resistor is required.
Required regenerative resistor power rating Pr:
Hence, with the internal regenerative resistor Pa = 75W, Pr<Pa, no external regenerative
resistor is required.
Let's assume if the load inertia is 15 times of motor inertia, Pr = 108.6W, Pr>Pa, external
regenerative resistor is required. And to consider for harsh working environment,
When selecting the resistance of the regenerative resistor, please be higher than the
minimum value recommended in table 2-3 but lower than Rmax
In conclusion, a regenerative resistor with resistance 40Ω - 70Ω and power rating 110W to
180W can be chosen.
Please take note that theoretical calculations of the regenerative resistance is not as
accurate as calculations done under normal operation.
Servo motor
( N + 1 ) × J × V
( 5 + 1 ) × 1.66 × 3000
2
=
182
(E1 − Ec)
49.3 − 22.85
Pr =
=
0.5T
Pr(external)=108.6/(1-40%)=181 W
)/Pr=7500/108.6=69Ω
2
2
Rmax =(380
-370
User manual of EL8-EC***F AC Servo
Rotor Inertia
Max. regenerative energy
-4
2
（× 10
）
kg.m
stored in capacitor Ec(J)
1.66
2
= 49.3J
182
= 26.45W
0.5 × 2
22.85
49
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