SAN-EI Air Motor
VA Series – Rotary Vane Type (One-Way Rotation)
VA Series Air Motor is a compact rotary vane type pneumatic motor manufactured by SAN-EI SEIKI SEISAKUSHO Co., Ltd. (Japan). It is designed as a lightweight, high-speed, one-direction air motor that can be used similarly to an electric motor in many industrial applications.
The motor operates using compressed air, which pushes sliding vanes inside the rotor to generate rotational motion.
1 Product Structure
The VA series uses a rotary vane mechanism:
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A rotor is mounted eccentrically inside the motor casing.
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Sliding vanes are inserted around the rotor.
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Compressed air enters through the supply port.
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Air pressure pushes the vanes outward, causing the rotor to rotate.
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Exhaust air exits through the exhaust port after performing work.
This design allows the motor to achieve fast start-up and stable rotation.
2 Main Features
Compact and Lightweight
The VA series air motor is small in size and easy to install in industrial equipment.
Similar to Electric Motor
The rated speed is 1800 rpm, making it usable in applications similar to electric motors.
Compatible Mounting Dimensions
The motor has the same shaft and flange size as equivalent electric motors, making replacement or integration easier.
Flexible Installation
The motor can be mounted in multiple ways:
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Face mounting
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Flange mounting
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Base mounting
Reversible Rotation
Although it is a one-way motor, the rotation direction can be changed by replacing certain internal components.
Vertical Installation Possible
The motor can also be installed in vertical orientation without affecting performance.
3 Operating Conditions
Typical working conditions include:
Air pressure:
0.5 MPa
Rated speed:
1800 rpm
Minimum practical speed:
800 rpm
If a lower speed is required, a gear reducer should be used.
4 VA Series Models and Specifications
At 0.5 MPa air pressure
| Model | Output | Speed | Torque | Air Consumption |
|---|---|---|---|---|
| VA30 | 0.23 kW | 1800 rpm | 1.2 Nm | 0.40 m³/min |
| VA50 | 0.38 kW | 1800 rpm | 2.0 Nm | 0.68 m³/min |
| VA100 | 0.75 kW | 1800 rpm | 4.0 Nm | 1.30 m³/min |
These motors provide a balance of speed, torque, and compact size, making them suitable for many industrial applications.
5 Installation Requirements
To ensure proper operation and long service life, SAN-EI recommends:
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Install an air filter in the compressed air line.
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Install a lubricator (line oiler) to provide lubrication.
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Avoid long-term operation above the rated speed.
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Connect the air supply to the designated IN port.
6 Typical Applications
VA series air motors are commonly used in industrial environments where pneumatic power is preferred.
Industrial Machinery
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Mixers
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Small conveyors
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Drive rollers
Chemical and Oil Industry
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Pump drives
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Valve operation systems
Shipbuilding and Marine Equipment
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Deck machinery
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Auxiliary equipment drives
Factory Automation
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Assembly equipment
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Material handling devices
Because the motor uses compressed air instead of electricity, it is suitable for explosive or hazardous environments.
7 Advantages of Air Motors
Compared with electric motors, air motors provide several advantages:
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Safe in explosive atmospheres
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No overheating risk under overload
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Self-cooling during operation
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Easy speed control by regulating air flow
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Instant start and stop capability
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Lightweight and compact design
| 型式 | 出力［kw］ | 回転数［rpm］ | トルク［N-m］ | 空気消費量［㎥/min(nor)］ |
|---|---|---|---|---|
| VA30 | 0.23 | 1800 | 1.2 | 0.40 |
| VA50 | 0.38 | 1800 | 2.0 | 0.68 |
| VA100 | 0.75 | 1800 | 4.0 | 1.30 |