SAN-EI Air Motor
VF Series – Rotary Vane Type Air Motor
VF Series is a rotary vane type pneumatic air motor manufactured by SAN-EI SEIKI SEISAKUSHO Co., Ltd. (Japan). It is one of the most widely used air motors due to its simple structure, compact size, and high power-to-weight ratio.
This series is suitable for a wide range of industrial applications requiring medium to high rotational speeds and reliable pneumatic drive systems.
1 Structure and Working Principle
The VF series air motor operates using a rotary vane mechanism.
Working principle
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A rotor is installed 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 air supply port.
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The air pressure pushes the vanes outward, rotating the rotor.
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Exhaust air is discharged through exhaust ports after performing work.
This design enables efficient conversion of compressed air energy into mechanical rotation.
2 Key Features
Simple and Reliable Structure
The VF series has a very simple internal structure, making it the most widely used type of air motor.
High Output with Compact Size
Compared with its output power, the motor is small and lightweight, which helps reduce machine size.
Wide Speed Range
The motor is suitable for medium-speed to high-speed operation, making it adaptable to various industrial equipment.
Improved Vane Durability
The vanes are specially processed to significantly reduce:
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seizure
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cracking
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abnormal wear
Flexible Mounting
Multiple installation options are available:
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Face mounting
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Flange mounting
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Base mounting
3 Operating Conditions
Typical operating parameters include:
Air pressure:
0.5 MPa
Minimum practical rotation speed:
800 rpm
When a speed lower than 800 rpm is required, it is recommended to use a gear reducer.
For stable operation, the following accessories should be installed:
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Air filter
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Lubricator (line oiler)
4 VF Series Models and Specifications
At 0.5 MPa air pressure
| Model | Output | Speed | Torque | Air Consumption |
|---|---|---|---|---|
| VFR03 | 0.24 kW | 3200 rpm | 0.73 Nm | 0.38 m³/min |
| VF05 | 0.76 kW | 2800 rpm | 2.60 Nm | 1.1 m³/min |
| VF10 | 0.91 kW | 2600 rpm | 3.35 Nm | 1.5 m³/min |
| VF20 | 1.71 kW | 2300 rpm | 7.10 Nm | 2.3 m³/min |
| VF30 | 2.09 kW | 2000 rpm | 10.0 Nm | 2.6 m³/min |
| VF50 | 4.24 kW | 1800 rpm | 22.5 Nm | 5.4 m³/min |
| VF75 | 6.60 kW | 1400 rpm | 45.0 Nm | 9.0 m³/min |
5 Typical Applications
VF series air motors are widely used in various industrial fields.
Chemical and Petrochemical Industry
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Pump drives
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Mixers
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Valve actuators
Marine Industry
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Winches
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Deck machinery
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Ship equipment drives
Steel and Heavy Industry
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Conveyors
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Hoisting equipment
General Industrial Machinery
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Mixers
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Roll drives
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Packaging machinery
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Automated production equipment
These motors are particularly suitable for hazardous environments where electric motors may not be safe.
6 Advantages of Air Motors
Compared with electric motors, pneumatic air motors offer several advantages:
• Safe operation in explosive atmospheres
• Self-cooling due to compressed air expansion
• No risk of burnout under overload
• Easy speed adjustment through air pressure control
• Quick start and stop response
• Compact and lightweight design
| 型式 | 出力［kw］ | 回転数［rpm］ | トルク［N-m］ | 空気消費量［㎥/min(nor)］ |
|---|---|---|---|---|
| VFR03 | 0.24 | 3200 | 0.73 | 0.38 |
| VF05 | 0.76 | 2800 | 2.60 | 1.1 |
| VF10 | 0.91 | 2600 | 3.35 | 1.5 |
| VF20 | 1.71 | 2300 | 7.10 | 2.3 |
| VF30 | 2.09 | 2000 | 10.0 | 2.6 |
| VF50 | 4.24 | 1800 | 22.5 | 5.4 |
| VF75 | 6.60 | 1400 | 45.0 | 9.0 |