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70mm Frameless Torque Motor for High-Torque Direct Drive Applications

70mm frameless motor is designed for high torque direct-drive systems. Commonly applied in industrial robots, collaborative robots, and precision automation equipment.
  • 70ZWC20/25X-1

  • Modar Motor

  • 70mm

  • 216/456W

  • 0.55/1.3N.m

  • 48V

  • 100% pure copper

  • 2

  • about 30 days

Availability:

Product Overview

The 70mm frameless motor is designed for direct-drive systems that require higher continuous torque, smooth motion, and precise control. With its robust electromagnetic design and frameless structure, 70mm frameless motor allows OEM engineers to integrate high-torque capability directly into their mechanical assemblies.

70mm frameless motor series is widely used in robotics and industrial automation systems where backlash-free motion, high positioning accuracy, and long service life are critical.


frameless motor 50mm-70mm


Key Features

  • High torque density in a 70mm frame size

  • Smooth direct-drive performance with low torque ripple

  • Designed for continuous industrial operation

  • Compatible with servo and torque control systems

  • Optimized for OEM mechanical integration


Typical Applications of 70mm frameless motor


Application Positioning

The 70mm frameless motor is suitable for industrial applications that require higher continuous torque and robust mechanical integration.


Typical Industries & Use Cases

Common use cases include industrial robot joints, automated handling systems, rotary axes, and precision manufacturing equipment.

  • Industrial robot joints and rotary axes

  • Automated handling and positioning systems

  • Precision rotary tables

  • Medical and rehabilitation robots


Integration Value

Its torque capability and thermal stability make 70mm frameless motor well suited for direct-drive solutions operating under continuous or high-duty cycles.


Technical Specifications (70mm Frameless Motor Series)

The following technical data applies to the 70mm frameless motor 70ZWC20X-1 and 70ZWC25X-1.


Motor Characteristics
Motor part number
70ZWC20X-1 70ZWC25X-1
Stator outer diameter mm 69±0.037 69±0.037
Rotor inner diameter mm 42+0.039 42+0.039
Overall length (L) mm 15.9  21.5 
Stack length (L1) mm 10.3  15.9 
Rotor length (L2) mm 20.5±0.2 26±0.2
Number of slots - 18  18 
Pole pairs - 10  10 
Phase-to-phase resistance 0.32  0.22 
Phase-to-phase inductance mH 0.52  0.35 
Winding connection method - Star connection Star connection
Insulation class - F F
Duty type - S2 S2
Feedback method - Hall sensor Hall sensor
Commutation angle - 120o 120o
Insulation strength (Withstand voltage) - 500VAC/1mA/1s 500VAC/1mA/1s
Insulation resistance - 100MΩ/500VDC 100MΩ/500VDC
Stator weight g 167.5  224 
Rotor weight g 72  90 
No-load speed RPM 4350  4400 
No-load current A 0.5(REF) 1.3(REF)
Rated voltage VDC 48  48 
Rated power W 216  456 
Rated torque N·m 0.55  1.3 
Rated speed RPM 3750  3350 
Rated current A 5.4  11.4 
Torque constant Nm/A 0.109  0.13 
Back-EMF constant (effective value) Vrms/Krpm 8.1  9.6 
Peak torque N·m 1.65  2.6 
Peak current A 14.2  21 
Rotor inertia g·cm² 358  455 


Dimension Drawing

70mm frameless motor 70ZWC20X-1



70ZWC20X-1 70mm frameless motor drawing


70mm frameless motor 70ZXC25X-1


70ZWC25X-1 70mm frameless motor drawing




Lead-out type Lead-out color Function

UL1332 AWG20/

UL1332 AWG18

Yellow U phase
Red V phase
Black W phase

70mm frameless motor wiring



Torque Performance Curves

70mm frameless motor 70ZWC20X-1


70ZWC20X-1 70mm frameless motor curve


70mm frameless motor 70ZXC25X-1


70ZWC25X-1 70mm frameless motor curve



frameless motor.pdf




FAQ – 70mm Frameless Motor


Q1: Is the 70mm frameless motor suitable for continuous torque operation?

Yes, 70mm frameless motor is designed for applications requiring stable continuous torque.


Q2: Can 70mm frameless motor replace a gearbox-based drive system?

In many applications, yes—especially where zero backlash and smooth motion are required.


Q3: Does 70mm frameless motor require additional cooling?

Cooling depends on duty cycle and load; system-level cooling is recommended for higher torque usage.


Q4: Is 70mm frameless motor compatible with servo drives?

Yes, 70mm frameless motor is compatible with mainstream servo and torque controllers.


Q5: Can winding and voltage be customized?

Yes, both can be adapted to your system design.


Q6: Is 70mm frameless motor used in Europe and North America?

Yes, 70mm frameless motor is widely supplied to OEM customers in these markets.


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