Bistable Rotary Solenoids

 Takano’s rotary solenoids use cylindrical permanent magnet as the rotor and produce true rotational motion from the repulsive and attractive forces induced between the permanent magnet and the magnetic poles in the yoke.  Even after de-energization, the solenoids stay in position using the holding force of the permanent magnet. Unlike conventional rotary solenoids built to mechanically convert the back-and-forth linear motion (thrust-direction motion) of the shaft into rotational motion, our rotary solenoids produce rotational motion with no axial movement of the shaft and hence have a longer life.

bistable rotary solenoid


1. It's bi-stable

 Bi-stable type switches clockwise and counterclockwise rotation every time the current direction is changed between +(positive) and –(negative). Even after de-energization, the solenoid stays in its position using the holding force of the permanent magnet.
 Unlike the rotary solenoids that use a spring for the motion of one direction, bi-stable solenoid rotate in both directions by magnetic force and current pulse.

2.High power and fast response

 It is high power and quick response because this solenoid reciprocates by the change of current direction, +(positive) and –(negative), instead of using spring.

3. Flexibility in travel angle up to 90°

 Travel angle can be set up to 90° depending on your application requirement.
(Requires external stops. See How to set external stops for details. )

4.Extremely silent

 There is no axial motion of the shaft in thrust direction and the end stops are set externally.  This leads to minimizing the impact noise when in operation.
 For types with internal end stops, countermeasures are taken for impact and vibration by carefully choosing the buffer used for the stops.

5. Long Life

 Long life because of no sliding parts except for the bearing.

6. Return-by-spring type is also available

 Self-restoring types using spring return are also available, enabling a fail-safe capability.

Series Comparative Table

Type & Features Series Travel

Peak Torque(mN・m)

5V 12V 24V

Micro type
Ultra-compact rotary solenoids designed as a mechanical drive for small equipment with limited space inside.Ideal for high-speed shutters of optical systems.


Up to


0.45 - - φ7 × 10
RSR10/15-S 0.6 1.3 - φ10.5 × 20

Flat type
Thin rotary solenoids ideal for high-speed shutters for optical equipment. Higher in torque compared to motors in similar shape.


Up to


1.7 - - φ22 × 8
RSR28/17-CAB0-N008 13 24 - φ28 × 17
RSU14/10-SAP1-T115 2 24 29 29 × 25 × 23
RSU14/10-WAP1-T115 2 22 27 29 × 25 × 23
RSU14/10-CAP1-G014V 24 42 64 29 × 25 × 23

Miniature type
Standard models that are field-proven as a compact mechanical drive for optical systems, banking terminals and other various equipment.


Up to


22 36 49 φ26 × 31
RSR14/10-PAP0-G015 12 23 33 φ26 × 31
RSR14/20-CT2 4 61 96 φ26 × 61
RSR14/20-CBB0-N032A 32 43 82 φ26 × 44

Standard type
The most generic type used as a high-speed actuator for various purposes inside factory automation systems and labor-saving equipment.


Up to


40 70 120 φ50 × 35
RSR20/20-CAB0 70 180 230 φ50 × 45
RSR20/40-CAB0-N036 - 170 250 φ50 × 65

Large type
Large rotary solenoids for factory automation and conveying equipment. It has high enough torque which can also be an alternative to air driven actuators which will free you from air source issues.


Up to


- 1200 1900 φ80 × 90

High-speed/Low cost type
Low-cost design rotary solenoids developed for use in high-speed sorting machinery. It can be easily installed with a single screw.

RSA32/47-C 20° - - 20 46.5 × 38 × 16
RSA40/42 30° - - 20 50.5 × 40 × 19

Driver board for rotary solenoid
Rotary solenoid driver board which enables flexible setting of energization time in 1 msec step within the range of 1 to 511 msec for clockwise and counterclockwise rotation.

TSD-R20-2B - - - - 80 × 100 × 33

Please refer to each product page for detail specifications.

Note) External stops

 Except for some models, to provide flexibility of travel angel, Takano bistable rotary solenoids have no built-in stops. Therefore, external stops must be additionally set to mechanically define the traveling angle. Use rubber or similar buffer material for the stops. Avoid the use of metal stops that causes strong metal-to-metal impact which may lead to failure of the solenoid.

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