Specification
A frameless torque motor (Frameless torque servo motor) with a 25.3mm aperture and a 43mm outer diameter directly drives robot joints. Rated torque range options: 0.16 - 0.48 Nm and custom options. Highly customizable.
| Model | U4315 | |
| DC voltage(VDC) | 48 | |
| Rated Output(W) | 83.84 | |
| Rated torque(N.m) | 0.16 | |
| Instant Max Torque(N.m) | 0.48 | |
| Rated Current(A) | 3 | |
| Instant Max Current(A) | 9 | |
| Rated Speed(rpm) | 5000 | |
| Maximum speed(rpm) | 6500 | |
| Torque Parameter(Nm/A) | 0.042 | |
| Rotor inertia(kg.cm²) | 0.04 | |
| Back EMF coefficient(V/Krpm) | 8 | |
| Resistance(ohms@20℃) | 2.5 | |
| Inductance(mH) | 0.7 | |
| Number of pole-pairs(2P) | 10 | |
| Weight(kg) | 0.058 | |
| Cogging Torque (mN.m) | 4.8(REF.) | |
| Size(mm) | L1 (Stator stack height) | 8 |
| L2 (Rotor height) | 9 | |
| L3 (Overall height) | 15.2 | |
Applicable Inductive encoders
Drawing
Case studies (Customized frameless motors developed with our clients)
Additional Info
The U-series frameless stator-rotor kits represent Mosrac's consistent evolution from the previous generation's frameless series. Due to their exceptional technical specifications, these kits are particularly suited for various demanding applications.
Features:
▪︎ Frame size 43 mm OD
▪︎ Max speeds up to 6,500 rpm
▪︎ Pole-pairs number (2P): 7 or custom
▪︎ 48 VDC Rated Voltage
▪︎ 3.0-9.0 Arms Rated Current
▪︎ Continuous torque 0.16 N-m
▪︎ Peak torque range 0.48 N-m
▪︎ CE, RoHS, REACH Compliant
▪︎ Standard windings to match special speed and torque performance requirements
▪︎ Optional magnetic or inductive encoders as rotor position feedback devices
▪︎ Frameless models use the load’s shaft, bearings, and additional position feedback devices such as encoders.
Benefits:
One of the latest next-generation frameless motors is hollow-shaft U43 series stator-rotor kits,
which offer market-leading torque density and maximum design freedom for structurally integrated drive engineering.
Our frameless BLDC motor range is available in various sizes and rated torque.
▪︎ Frameless construction provides a high level of design flexibility
▪︎ Offers excellent torque density at a competitive price
▪︎ Features hollow-shaft capability
▪︎ Lightweight and compact design
▪︎ Operates on low voltage, ranging from 48V to custom
▪︎ High torque density and dynamic performance are achieved through an excellent copper fill factor
▪︎ Reduced thermal losses due to concentrated coils
▪︎ Drive system design is optimized for weight and installation space based on load profile analysis
▪︎ Provides excellent dynamic control and precision
▪︎ Ideal for a diverse range of applications
Applications:
▪︎ Machine tool
▪︎ Packaging
▪︎ Robotics
▪︎ Semiconductor
▪︎ Automotive
When to Use:
▪︎ Substantial cost savings
▪︎ Decreased mechanical complexity
▪︎ Enhanced flexibility in design
▪︎ Exceptional performance in a compact space
▪︎ Improved dynamic response
▪︎ Minimum motor size in each application
▪︎ Low cogging for smooth operation
▪︎ Low inertia allows for quicker acceleration
Download
U4315 Torque Motor Outline Drawing.pdf
OD: 43mm|Height: 15.2mm
U43 Series 43MM Frameless Inner Rotor Motors Catalog.pdf
OD: 43mm|Height: 15.2mm optional
OD: 43mm|Height: 15.2mm
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Frequently bought together - Magnetic encoders
Direct drives need high-quality position signals to ensure optimal performance. Perfect measuring signals can enhance the surface quality of machined workpieces, reduce the machine frame's vibrations, minimize velocity-dependent motor noise, and prevent excessive heat generation in the motor.
Mosrac recommends using a magnetic encoder to enhance the accuracy, speed stability, and thermal behavior of direct drive axes. Because there is no mechanical transmission between the encoder and the feed unit, the position signals are not susceptible to inaccuracies or delays.
Custom combinations are available on request and contact us.
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