40 Series ATEX Explosion Proof AC Servo Motors 

Product Overview

The WHEATSTONE 40 Series ATEX Explosion Proof AC Servo Motors is A high-precision drive motor specifically designed for space-constrained flammable and explosive environments, combining an ultra-compact 40mm frame size, explosion-proof safety certification, and the high dynamic response characteristics of a servo motor.

Key Features

Compact Size: With a side length of just 40 mm and a minimum axial length of 109 mm, the motor is ideal for precision equipment—such as semiconductor testing equipment and online analytical instruments—where internal space is measured in centimeters.

High Explosion-Proof Rating: Typical products meet the Ex db IIC T4 Gb rating. IIC is the highest group for gas explosion protection, making it suitable for environments containing the most hazardous gases, such as hydrogen and acetylene; The T4 temperature class ensures that the maximum surface temperature does not exceed 135°C.

Excellent Control Accuracy: Utilizing closed-loop vector control, repeatability can be consistently maintained within ±0.005 mm, with no loss of synchronization during 3,000 hours of continuous operation.

Technical Highlights

• Motor Type: Axial Flux Permanent Magnet Motor

• Frame Sizes: Customizable from 100 mm to 600 mm

• Efficiency: >95% depending on configuration

• Torque Density: Up to 2x higher compared to conventional radial flux motors

• Cooling: Air-cooled, liquid-cooled, or conduction cooling available

• Temperature Range: -10°C to +50°C

• Protection Class: IP54–IP68 depending on application

• Applications: Electric vehicles, aerospace propulsion systems, renewable energy (wind & hydro), robotics, and high-performance industrial machinery

Motor Model

Motor Model	L(mm)
40ST-口00230-EX-XXV	109
40ST-口00330-EX-XXV	119
40ST-口00230B-EX-XXV	139
40ST-口00330B-EX-XXV	149

Motor Dimensions

   

Electrical Parameters

Main performance parameters
Motor Model	40ST-口00230-EX	40ST-口00330-EX
Rated Power(KW)	0.05	0.1
Rated current(A)	0.69	1.27
Rated speed(RPM)	3000	3000
Maximum speed(RPM)	6000	6000
Rated Torque(NM)	0.16	0.32
Maximum Torque(NM)	0.48	0.96
Rotor of Inertia(g.cm²)	46	80

It delivers “micrometer-level” precision in highly confined, precision-engineering environments where flammable and explosive hazards are present. Its value lies in resolving the conflict between the need for explosion-proof design and the requirement for extreme miniaturization.

1.Spray Painting Robots and AGVs

In applications such as automotive parts coating and furniture painting, volatile organic compounds (VOCs) mixed with air can create explosive conditions. The 40-base motor is compact and lightweight, making it ideal as a drive unit for the forearm or wrist joint of a spray painting robot. It enables the spray gun to perform complex movements—such as rotation and pitch—within confined spaces, ensuring explosion-proof safety while achieving a uniform paint film thickness.

2. Petrochemicals

These applications have extremely stringent explosion-proof requirements and may involve the most hazardous gas environments, such as those containing hydrogen and acetylene. The 40-base motor achieves the highest gas explosion-proof rating—Ex db IIC T4 Gb—in an extremely compact design, while the T4 temperature class ensures that its maximum surface temperature does not exceed 135°C, meeting the demanding requirements of “in-situ analysis.”

3.Pharmaceuticals and Fine Chemicals

In applications such as pharmaceutical aseptic filling lines and reactor agitation, the environment may contain vapors of flammable solvents such as ethanol and acetone, or hydrogen gas may be introduced for reactions.

40-base motors are used to drive filling pumps, valves, or small agitators; their explosion-proof enclosures eliminate the risk of vapors being ignited by electrical sparks or high-temperature surfaces. At the same time, high-precision servo control ensures highly consistent filling volumes for each bottle of liquid medication, meeting strict pharmaceutical quality requirements.

4.Lithium-Ion Battery and New Energy Manufacturing

In lithium-ion battery manufacturing processes such as coating and calendering, organic solvents like N-methylpyrrolidone are used, or flammable electrode dust may be generated, creating an explosive atmosphere.

In the in-line thickness measurement systems of coating machines or in small actuators, 40-base motors provide stable speed and position control under explosion-proof conditions, ensuring production safety and consistent electrode sheet quality.

Why do you need a custom motor?

1)Global trade, market diversification, diversified consumer demand, the The trend of individualization is obvious, backing up to the upstream industry to have more special spare parts requirements for new processes and new processing equipment.

2)The World's future long-term national policy guidelines for supply-side reform, elimination of backward production capacity, environmentally friendly, energy-saving, intelligent and safe, the entire industrial environment are in transition, the original batch, large-scale production can not meet market needs.

3)Industrial homogenization competition is extremely serious, the survival environment is worrying; a large number of enterprises seeking change, in response to national policies, the trend of the times, close to customers, to solve customer personalization, targeted problems, personalization has become an important way of industrial production.

4)Electrification, automation, intelligence is the future trend, these can not be separated from the motor, so the future development trend of the motor industry is obvious, especially the personalized non-standard custom motor, market demand is more objective.