Sharp CP-SR421 User Manual download pdf (Page 318)

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

(SH(NA)030112).

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.

time is reduced, and the high-frequency operation is enabled.

(d) Since transmission mechanism is no longer required, the direct drive motor does not deteriorate with

time.

(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.

Differences

Category Item

Direct drive motor Rotary servo motor

Remarks

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 (MR-BAT6V1SET)

Required Required

Absolute position storage

unit

(MR-BTAS01)

Required Not required

high-accuracy indexing.

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