M51970 Ver la hoja de datos (PDF) - MITSUBISHI ELECTRIC

Número de pieza

componentes Descripción

Fabricante

M51970

MOTOR SPEED CONTROL

MITSUBISHI ELECTRIC  

(Note 1) How to determine Rτ and Cτ

This constant determines the motor rotating speed. If the motor

rotating speed and the number of poles in the tacho-generator are

assumed to be N and P, respectively, the following relational

expression is generally established. Putting Rτ in the range of

10kΩ to 500kΩ, select the constant according to the required

rotating speed.

NP =

1

1.17Rτ Cτ

Tacho-generator output frequency–

Connection resistance characteristics of pin 1

10000

5000

3000

2000

1000

700

500

300

200

0.1µF0.0470µ.0F220µ.F01CµτF=4700pF

100

10 20 30 50 70 100 200 300 500 1000

Connection resistance Rτ (kΩ) at pin 1

(Note 2) How to determine RSC

According to the relation with maximum current ISC flowing to pin 6 ,

the following relational expression is generally established. Set ISC

in such a way that the value cannot exceed the maximum rated

value of the power dissipation of the M51970L when the supply

voltage and temperature arrive at their maximum values.

0.7(V)

ISC = RSC

Maximum drive current at pin 6 –

current limit resistance characteristics

50

40

30

20

10

0

0 20 40 60 80 100 120 140 160 180 200

Current limit resistance RSC (Ω)

(Note 3) How to determine CF1, CF2 RF

Select CF1 and CF2 RF according to the inertia of motor and

required rising characteristics.

MITSUBISHI <CONTROL / DRIVER IC>

M51970L

MOTOR SPEED CONTROL

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