13.OPTIONS AND AUXILIARY EQUIPMENT

(b)To make selection according to regenerative energy

Use the following method when regeneration occurs continuously in vertical motion applications or when it is desired to make an in-depth selection of the regenerative brake option:

a. Regenerative energy calculation

Use the following table to calculate the regenerative energy.

M

Friction torque

TF

TU

Unbalance torque

Servomotorspeed

(

)

Generatedtorque

(

)

 

tf(1 cycle)

 

 

 

No

 

 

Up

 

 

 

 

 

Down

Time

 

 

 

t1

t2

t3

t4

Tpsa1

Tpsd1

Tpsa2

Tpsd2

1)

(Driving)

 

 

 

2)

4)

5)

8)

 

 

 

 

 

 

 

 

 

 

6)

3)

 

 

7)

(Regenerative)

 

Formulas for calculating torque and energy in operation

Regenerative power

Torque applied to servo motor [N m]

 

 

 

 

 

Energy [J]

1)

T1

 

 

 

(JL

JM) No

1

 

 

TU

TF

E1

 

 

0.1047

 

 

No

T1

Tpsa1

 

 

 

 

 

 

 

 

 

 

2

 

 

9.55 104

 

Tpsa1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2)

T2

 

 

 

TU

TF

 

 

 

 

 

 

E2

0.1047

 

No

T2

t1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3)

T3

 

 

 

(JL

JM) No

 

1

 

 

TU

TF

E3

 

 

0.1047

 

 

No

T3

Tpsd1

9.55 104

 

Tpsd1

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4), 8)

T4

 

 

 

TU

 

 

 

 

 

 

 

E4

 

 

0 (No regeneration)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5)

T5

 

 

 

(JL

JM) No

1

 

 

TU

TF

E5

 

 

0.1047

 

 

No

T5

Tpsa2

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

9.55 104

 

Tpsa2

 

 

 

 

 

 

 

 

 

 

 

 

6)

T6

 

 

 

TU

TF

 

 

 

 

 

 

E6

0.1047

 

No

T6

t3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7)

T7

 

 

 

(JL

JM) No

1

 

 

TU

TF

E7

 

0.1047

 

 

No

T7

Tpsd2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

9.55 104

 

Tpsd2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sum total of regenerative energies

Sum total of negative energies in 1) to 8)

b. Losses of servo motor and servo amplifier in regenerative mode

The following table lists the efficiencies and other data of the servo motor and servo amplifier in the regenerative mode.

Servo amplifier

Inverse efficiency[%]

Capacitor charging[J]

MR-J2S-10A(1)

55

9

MR-J2S-20A(1)

70

9

MR-J2S-40A(1)

85

11

MR-J2S-60A

85

11

MR-J2S-70A

80

18

MR-J2S-100A

80

18

MR-J2S-200A

85

40

MR-J2S-350A

85

40

Inverse efficiency ( )

:Efficiency including some efficiencies of the servo motor and servo

 

amplifier when rated (regenerative) torque is generated at rated speed.

 

Since the efficiency varies with the speed and generated torque, allow for

 

about 10%.

Capacitor charging (Ec)

:Energy charged into the electrolytic capacitor in the servo amplifier.

 

13 - 2

Page 195
Image 195
Mitsubishi Electronics MR-J2S- A instruction manual JM No 1047, No regeneration