Direct-Drive Motor Assembly; Example Procedure Of Assembly - Mitsubishi Electric CNC Specifications And Instruction Manual

Direct Drive Motor Specifications and Instruction Manual
6 Assembly and Installation

6.3 Direct-drive Motor Assembly

CAUTION
1. As a magnetic attraction force is generated on the rotor of direct-drive motor, take measures such as using nonmagnetic
tools at the time of assembly.
2. A magnetic attraction force of about 200N (stator outer diameter φ130) to 1300N (stator outer diameter φ330) will be
generated when a rotor is inserted into a stator.
Take necessary and sufficient safety measures such as using a jig considering the attraction force. Otherwise the rotor
may suddenly be attracted to the stator during assembling, resulting in a great danger.

6.3.1 Example Procedure of Assembly

(1) Shaft assembly
Fit a shaft into the rotor using the pilot section of rotor inner diameter as a guide.
Use the screw holes on the rotor ends to fix the rotor and shaft by screws. Use as many holes on the both ends as
possible to fix them.
CAUTION
1. Do not raise the temperature of the rotor to 40°C or higher before assembling since heat may demagnetize magnets. Do
not shrink-fit the rotor.
2. The rotor has not balanced. If the balance of the rotor is a problem, adjust the dynamic balance after assembling the
shaft to the rotor. Take special care for the magnetic attraction force acted on the rotor surface when balancing. Use the
shaft part for balancing. Do not machine the rotor itself or install balancing screws.
IB-1501068-C
Attraction force is
generated
Rotor
Attraction force is generated
Fix the rotor and shaft by screws
Use the pilot section of rotor inner diameter as a guide
Stator
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