Products
Electric Unit Products
We provide high-performance, high-quality motors and reduction gears to help address societal challenges such as the shrinking workforce and the need to reduce CO2 emissions.
In response to the above social issues, there is a growing demand for robotization and electrification in society.
We have incorporated our commitment to high performance and high quality, cultivated through piston ring development, into strain wave gears, which are indispensable for robots, and actuators powered by motors, which are indispensable for electrification, to develop flat, lightweight, energy-efficient, and long-lasting products.
Strain wave gears
Strain wave gears are small, lightweight reduction gears with a high reduction ratio. For reduction gears used in robots and transport equipment that require precise movements, high precision and low backlash are required. At NPR-RIKEN, we are harnessing the resin manufacturing expertise we have cultivated over the years to develop resin-based strain wave gears, resulting in lighter products that maintain high precision.
Structure of strain wave gears
A strain wave gear consists of three basic components, giving it a compact design.
Operation principle
0 degree
1
The flexspline is deformed into a non-circular shape by the wave generator.
90 degrees
2
When the ring gear is fixed and the wave generator is rotated clockwise, the meshing position of the flex spline shifts.
180 degrees
3
Rotating the wave generator 180 degrees causes the flexspline to move counterclockwise by half the tooth difference with the ring gear.
360 degrees
4
Rotating the wave generator 360 degrees causes the flexspline to move by the tooth difference relative to the ring gear. This movement becomes the output.
Resin strain wave gears
We are developing wave gear reducers with flex spline and ring gear made of super engineering plastic. Despite being made of resin, it offers high reduction accuracy and torque capacity. Various sizes and reduction ratios are available, so please inquire for details.
Application examples
①Vertically articulated robots
The tip portion of collaborative robots and SCARA robots, etc.
②Precision instruments, inspection and analysis equipments
Movable part, etc.
③Humanoid robots
Joints, robot hands, etc.
Slim actuators
We are developing actuators that combine motors and gearboxes designed not only for compactness but also for slimness. Our goal is to create actuators that can be easily installed even in environments with challenging layout constraints.
Actuators for small mobility
These are slim, high-output actuators. We achieved a slimmer design by combining our proprietary axial-gap motor, developed internally, with a 3K planetary reduction gear. Furthermore, the 3K planetary reduction gear provides high transmission efficiency, enabling back-driving capability.
Actuators for small drive unit
These are slim, compact actuators. The motor part employs a radial-gap motor, contributing to a reduction in diameter. The reduction gear is a specialized cycloid gear mechanism, enabling a slim-profile design. Integrating these two components results in an actuator designed for extremely slim, compact drive applications.
Application examples
Collaborative robots, AGV (Automated Guided Vehicle), Maintenance robots, Medical devices (care-assistance robots, exoskeletons), inspection and analysis equipment, aerospace equipment.
*This page features a selection of our product lineup.
In addition to slim-profile actuators, we also offer slim-profile motors and slim-profile reduction gears.
(Frameless motors are also available.)
We are also happy to discuss product specifications (such as size, torque, and rotational speed).
Axial gap motors and pressed powder cores
Slim-profile, high-torque axial gap motor
This motor features a structure in which the air gap between the rotor and stator is oriented perpendicular to the rotational axis. Compared to conventional radial gap motors, it is characterized by a slim profile and high torque. Because the magnetic circuit becomes three-dimensional, a pressed powder core is suitable as the motor core.
■Development Examples
In-wheel motor for agricultural robots
Size: Φ188 × 155 mm Output: 150W (MAX 100Nm)
This low-speed, high-torque motor integrates a slim axial gap motor, reducer, and brake into a single unit, featuring an IP56-equivalent waterproof and dustproof structure.
Features IP56-equivalent dustproof and waterproof design with low-speed, high-torque characteristics delivering a maximum torque of 100Nm.
Frameless motor
Size: Φ72 × 23 mm Output: 310W
This slim, axial gap frameless motor, featuring a large-diameter central hole, is suitable for use in collaborative robot joint drives and as a compact actuator. It allows wires and air tubes to be easily passed through the central hole, and the motor characteristics can be adjusted by changing the air gap.
Drive motors for small mobility vehicles
Size：Φ72×43mm Output：300W
This is an axial gap motor for small mobilities and pump applications. It can be used as an in-wheel motor when combined with a reduction gear. It also contributes to slimmer pump designs by integrating with the impeller.
Ultra-compact motor
Size：Φ34×17mm Output：10W
A slim, lightweight axial gap motor for small actuators is suitable for use in compact fans and drones.
Hollow motor
Size：O.D. Φ65mm I.D. Φ30mm
This is an axial gap motor with an enlarged diameter of a hollow.
Pressed powder core
This motor core is manufactured by press-molding soft magnetic powder coated with an insulating film. Compared to conventional electromagnetic steel sheets, it offers the advantages of “a wide range of possible shapes”, “low eddy current loss”, and “capability to form three-dimensional magnetic circuits”. Consequently, it enables motor miniaturization and high-torque.
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