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Options and auxiliary equipment – MITSUBISHI ELECTRIC MELSERVO MR-J2S- A User Manual

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13 - 2

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

Unbal

ance t

o

rque

T

F

T

U

S

e

rv

o m

o

to

r s

peed

Gen

e

rat

ed t

o

rque

Time

Up

No

tf(1 cycle)

Down

( )

( )

(Driving)

(Regenerative)

T

psd2

t2

t3

t4

t1

T

psa2

T

psd1

T

psa1

1)

2)

3)

4)

5)

6)

7)

8)

Formulas for calculating torque and energy in operation

Regenerative power

Torque applied to servo motor [N m]

Energy [J]

1)

T

1

(J

L

J

M

)

9.55 10

4

N

0

1

T

psa1

T

U

T

F

E

1

2

0.1047

N

0

T

1

T

psa1

2)

T

2

T

U

T

F

E

2

0.1047 N

0

T

2

t

1

3)

T

3

(J

L

J

M

)

9.55 10

4

N

0

1

T

psd1

T

U

T

F

E

3

2

0.1047

N

0

T

3

T

psd1

4), 8)

T

4

T

U

E

4

0 (No regeneration)

5)

T

5

(J

L

J

M

)

9.55 10

4

N

0

1

T

psa2

T

U

T

F

E

5

2

0.1047

N

0

T

5

T

psa2

6)

T

6

T

U

T

F

E

6

0.1047 N

0

T

6

t

3

7)

T

7

(J

L

J

M

)

9.55 10

4

N

0

1

T

psd2

T

U

T

F

E

7

2

0.1047

N

0

T

7

T

psd2

From the calculation results in 1) to 8), find the absolute value (Es) of the sum total of negative

energies.

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

55

9

MR-J2S-10A1

55

4

MR-J2S-20A

70

9

MR-J2S-20A1

70

4

MR-J2S-40A

85

11

MR-J2S-40A1

85

12

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

MR-J2S-500A

90

45

MR-J2S-700A

90

70

MR-J2S-11KA

90

120

MR-J2S-15KA

90

170

MR-J2S-22KA

90

250

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.