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CAUTION

WARNING

EM-4020

EM-4020A

EM-4040

EM-4040A

OPERATION MANUAL

Brushless Motor

Thank you for purchasing the EM-4020

EM-4020A

EM-4040

EM-4040A  Brushless Motor. The <E4000 

CONTROLLER>, <E4000 Series Spindle>, and <Air Line Kit > are required to drive this brushless motor.   Read 
these Operation Manual carefully before use.  Also read <E4000 CONTROLLER>,  <E4000 Series Spindle>,  and  
<Air Line Kit> Operation Manuals. Always keep this Operation Manual in a place where a user can referred to for 
reference at any time.

1

. CAUTIONS FOR HANDLING AND OPERATION

■ 

Read these warnings and cautions carefully and only use in the manner intended.

■  

These warnings and cautions are intended to avoid potential hazards that could result in personal injury to the 
operator or damage to the device.  These are classified as follows in accordance with the seriousness of the risk.

Class

Degree of Risk

 WARNING

A safety hazard could result in bodily injury or damage to the device if 
the safety instructions are not properly followed.

 CAUTION

A hazard that could result in light or moderate bodily injury or damage 
to the device if the safety instructions are not followed

This brushless motor is not a hand tool. It is designed to be used on CNC machines or special 
purpose machines.

Do not touch the cutting tool while it is running. It is very dangerous.

Wear safety glasses, dust mask and use a protective cover around the spindle whenever the 
spindle is rotating.

Never connect, disconnect or touch the Connector and Motor Cord Plug with wet hands. This 
may cause an electric shock.

Never operate or handle the brushless motor until you have thoroughly read the Operation 
Manuals and safe operation has been confirmed.
1)  To prevent injuries / damages, check the spindle and cutting tool for proper installation, 

before operating the brushless motor. 

2)  Before disconnecting the brushless motor, always turn the control power off and turn the 

compressed air supply to the CONTROLLER off. Then it is safe to remove the brushless 
motor.

When installing a brushless motor to a fixed base, make sure the fixed base is grounded in 
order to avoid the risk of an electric shock.

Do not drop or hit this brushless motor, as shock can damage to the internal components.

Select suitable products or tools for all applications. Do not exceed the capabilities of the 
spindle or tools.

Carefully direct coolant spray to the tool. Do not spray directly on the brushless motor body.

Stop working immediately when abnormal rotation or unusual vibration are observed. 
Afterwards, please check the content of section 7 "TROUBLESHOOTING". 

After installation, repair, initial operation, or long periods of non operation, please carry out 
break -in as follow. Start rotating slowly and over a short period of time, increase speed 
gradually until allowable maximum speed.

Do not disassemble, modify or attempt to repair this brushless motor. Additional damage 
will occur to the internal components. Service must be performed by NSK NAKANISHI or an 
authorized service center.

When using this brushless motor for mass production, please purchase the another brushless 
motor as a spare in case of an emergency.

2

. FEATURES

The Brushless Motor housing is made from precision ground, hardened, stainless steel (SUS) with an outside 
diameter of 

ȭ

40 mm.

Excellent durability and high reliability are obtained by using a high-speed brushless motor, which eliminates 
the need for brush replacement and frequent maintenance.

The maximum output is 1200W.

A quick disconnect cord is available for easy brushless motor removal.

Air-cooling system with a small volume of air (100

/ min) is used to prevent heat buildup and allows long 

continuous operation.

OM-K0644E

3

. SPECIFICATIONS AND DIMENSIONS

3 - 1  Specifications

Standard Accessories

Wrench (36mm)

・・

1pc.

Operation Manual

・・

1set.

3 - 2  Outside View

Fig. 1

3 - 3  Torque Characteristics

Model

EM-4020

EM-4020A

EM-4040

EM-4040A

Maximum Rotation Speed

20,000min

-1

40,000min

-1

Max. Output

1,200W

Weight

1,300g

1,800g

1,300g

1,800g

*Note1 : 

 Motor Cord is sold separately. Please select the suitable motor cord length for your application.

<Option>

Motor Cord
*Note1

EMCD-4000-

M

(Power Line)

Cord Length : 2m, 4m, 6m, 8m
(The Air Hose (

ȭ

6mm) of the same length is attached.)

EMCD-4000S-

M

(Signal Line)

Cord Length : 2m, 4m, 6m, 8m
(The Air Hose (

ȭ

6mm) of the same length is attached.)

These Motor Cords <EMCD-4000-8M and EMCD-4000S-8M> are  never to be usd for Angle 
Type Brushless Motors <EM-4020A and EM-4040A>.  8 Meter Cords cannot be used on "A" 
Type (90-Degree) Motors.

Fig. 2

 EM-4020

EM-4040

 EM-4020A

EM-4040A

Fig. 3

Fig. 4

 EM-4020

EM-4020A

 EM-4040

EM-4040A

CAUTION

ȭ

40

0 -0.01

300

172.8

14.4

ȭ

40

0 -0.01

2,000

14.4

195.2

0

5

10

15

20

1400

1200

1000

800

600

400

200

0

100

90
80
70
60
50
40
30
20
10

0

Continuous Duty Area

Speed (

10

3

min

-1

)

Output

(W)

Torque

(cN

m)

Output

Torque

0

5

10

15

20

25

30

35

40

1400

1200

1000

800

600

400

200

0

100

90
80
70
60
50
40
30
20
10

0

Speed (

10

3

min

-1

)

Output

(W)

Torque

(cN

m)

Continuous Duty Area

Output

Torque

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