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1. FUNCTIONS AND CONFIGURATION
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1. FUNCTIONS AND CONFIGURATION
1.1 Summary
To meet high-accuracy and high-efficiency requirements in areas including semiconductor and liquid crystal
related machines, and surface mount device placement machines, a system with a direct drive motor in a drive
axis has been increased. The direct drive servo system includes the following features.
(1) Performance
(a) Since load is directly coupled to the direct drive motor, gear reducer and transmission elements can be
eliminated, offering greater rigidity and torque.
(b) The high-resolution encoder contributes to high-accuracy control.
(c) Due to the gearless structure, error caused by backlash can be eliminated, offering high-accuracy
operation and shorter settling time.
(d) Because of no reduction gear or others, the direct drive motor does not deteriorate with time.
(2) Mechanism
(a) The motor's low profile design contributes to compact construction and a low center of gravity for
enhanced machine stability.
(b) The motor has an inner rotor with hollow shaft which enables cables and pipes to be passed through.
(c) Lubrication and maintenance due to abrasion is not required.
The following shows the differences between the direct drive servo and the MR-J3-
B.