sh030106u.pdf - 第504页

15. USIN G A DI REC T DRIV E MOTOR 15 - 1 15. USING A DIRECT DRIVE MOTOR CAUTION When usi ng the direct dr ive motor , read the "D irect Dri ve Motor Instr uction Manual". POINT Refer to sectio n 1.4 for t he s…

14. USING A LINEAR SERVO MOTOR

14 - 36

14.4.4 Permissible load to motor mass ratio when the dynamic brake is used

Use the dynamic brake under the load to motor mass ratio indicated in the following table. If the load to

motor mass ratio is higher than this value, the dynamic brake may burn. If there is a possibility that the load

inertia moment may exceed the value, contact your local sales office.

The values of the permissible load to motor mass ratio in the table are the values when the linear servo

motor is used at the maximum speed.

Linear servo motor

(primary side)

Permissible load to motor mass ratio

[multiplier]

LM-H3 series 40

LM-U2 series

100

LM-F series

LM-K2 series 50

When actual speed does not reach the maximum speed of the linear servo motor, calculate the permissible

load to motor mass ratio at the time of using the dynamic brake by the following equation. (The upper limit is

300 times.)

Permissible load to motor mass ratio at the time of using the dynamic brake = Value in the table × (Servo

motor maximum speed

/Actual using speed

)

For example, when an actual using speed is 2 m/s or less for the LM-H3P2A-07P motor (maximum speed:

3.0 m/s), the equation will be as follows. Permissible load to motor mass ratio at the time of using the

dynamic brake = 40 × 3

= 90 [times]

15. USING A DIRECT DRIVE MOTOR

15 - 1

15. USING A DIRECT DRIVE MOTOR

CAUTION

When using the direct drive motor, read the "Direct Drive Motor Instruction

Manual".

POINT

Refer to section 1.4 for the software version of a servo amplifier that is

compatible with the direct drive servo system.

15.1 Functions and configuration

15.1.1 Summary

The fields of semiconductor/LCD manufacturing systems, mounters, and others have strong demands for

high accuracy and efficiency. Therefore, the number of systems using a direct drive motor for a drive axis

has been increasing. The direct drive servo system includes the following features.

(1) Performance

(a) The direct drive servo system ensures the high-rigidity and the high-torque. A high-resolution

encoder enables the high-accuracy control.

(b) The high-resolution encoder contributes to the high-indexer accuracy.

the high-frequency operation is enabled.

(d) Since reducer is no longer required, the motor does not deteriorate with time by reducer.

(2) Mechanism

(a) The motor's low profile design contributes to compact moving part of the machine and a low center

of gravity for enhanced equipment stability.

(b) The motor has an inner rotor with hollow shaft which enables cables and pipes to be passed through.

The following shows the differences between the direct drive motor and the rotary servo motor.

Category Item

Differences

Remark

Direct drive motor Rotary servo motor

External I/O signal

FLS (Upper stroke limit),

RLS (Lower stroke limit)

Required

(for magnetic pole

detection)

Not required

Automatically turns on in the

parameter setting.

Motor pole

adjustment

Magnetic pole detection Required Not required

(default setting)

Automatically executed at the first

servo-on after the power is turned

on.

For the absolute position detection

system, [Pr. PL01] can disable the

magnetic pole detection. (Refer to

(3) (a) of section 15.3.2.)

Absolute position

detection system

Absolute position encoder

battery

Required Required

Absolute position storage

unit (MR-BTAS01)

Required Not required

15. USING A DIRECT DRIVE MOTOR

15 - 2

15.1.2 Servo system with auxiliary equipment

CAUTION

Connecting a direct drive motor for different axis to the U, V, W, or CN2 may

cause a malfunction.

POINT

Equipment other than the servo amplifier and direct drive motor are optional or