14. USING A DIRECT DRIVE MOTOR
14 - 2
(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.
(c) Lubrication and the maintenance due to abrasion are not required.
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
Stroke limit input
signal (FLS, RLS)
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,
you can disable the magnetic pole detection
with parameter No.PS01. (Refer to (2) (b) of
14.4.2.)
Absolute position
detection system
Absolute position
encoder battery unit
(MR- MR-
BAT 8)
Required Required
Absolute
position
storage unit
(MR-BTAS01)
Required Not
required
Alarm/Warning
Alarms and warnings
only for direct drive
servo
Added
Added or changed alarms and warnings
Encoder error 3 (21. )
Absolute position erased (25. )
Initial magnetic pole detection error (27. )
Encoder counter error (2B. )
Servo control error (42. )
Direct drive motor overheat (46. )
Battery cable disconnection warning (92.1)
Battery warning (9F. )
Direct drive motor overheat warning (E2.1)
14.1.2 Combinations of servo amplifier and direct drive motor
The following shows the combinations of servo amplifier and direct drive motor. The drive motor is available for
servo amplifiers of which software version is B3 or above.
Servo
amplifier
MR-J3W-22B MR-J3W-44B MR-J3W-77B
MR-J3W-1010B
Direct drive motor
A-axis B-axis A-axis B-axis A-axis B-axis A-axis B-axis
TM-RFM002C20
TM-RFM004C20
TM-RFM006C20
TM-RFM006E20
TM-RFM012E20
TM-RFM018E20
TM-RFM012G20
TM-RFM040J10
Summary of Contents for MELSERVO-J3W Series
Page 17: ...8 MEMO ...
Page 27: ...1 FUNCTIONS AND CONFIGURATION 1 10 MEMO ...
Page 87: ...4 STARTUP 4 14 MEMO ...
Page 117: ...5 PARAMETERS 5 30 MEMO ...
Page 129: ...6 GENERAL GAIN ADJUSTMENT 6 12 MEMO ...
Page 185: ...10 CHARACTERISTICS 10 8 MEMO ...
Page 241: ...11 OPTIONS AND AUXILIARY EQUIPMENT 11 56 MEMO ...
Page 274: ...13 USING A LINEAR SERVO MOTOR 13 25 1 2 3 4 ...