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Kollmorgen MT1502A1-E2V1

Product Brief Introduction

MT1502A1-E2V1 is frameless hollow-shaft direct drive torque motor kit belonging to Kollmorgen MT large diameter torque motor product line. It separates stator winding assembly and permanent magnet rotor without integrated housing, designed for direct integration into customer machine mechanical frame to eliminate gearbox transmission mechanism.
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Detailed content

Technical Specifications

  1. Electrical Parameters
    • Rated DC Bus Input Voltage: 320 VDC
    • Continuous RMS Phase Current: 11.2 A
    • Peak RMS Phase Current: 33.6 A (3x overload, maximum 10s duration)
    • Rated Continuous Power Output: 2.7 kW
    • Torque Constant Kt: 12.6 N·m/A rms
    • Back EMF Constant Ke: 1.82 V/RPM
    • Phase Winding Resistance: 1.28 Ω @ 25°C
    • Phase Winding Inductance: 7.4 mH
  2. Mechanical Torque & Speed Parameters
    • Continuous Rated Stall Torque: 141 N·m
    • Peak Instantaneous Torque: 423 N·m
    • Rated Continuous Operating Speed: 180 RPM
    • Maximum Safe Mechanical Rotational Speed: 350 RPM
    • Rotor Inertia: 0.0125 kg·m²
    • Cogging Torque: ≤ 0.8% of continuous rated torque
  3. Hollow Shaft Dimension Specs
    • Inner Hollow Shaft Bore Diameter: 150 mm
    • Stator Outer Mount Diameter: 245 mm
    • Overall Axial Stack Length: 52 mm
  4. Feedback & Thermal Specs (E2V1 Configuration)
    • Compatible Feedback Type: External mounted sine/cosine rotary encoder, BiSS absolute encoder
    • Embedded Thermal Sensor: PTC 145°C over-temperature trip sensor pre-wired on stator winding
  5. Environmental & Insulation Specs
    • Insulation Class: F Class (155°C maximum winding temperature)
    • Operating Ambient Temperature: 0°C ~ +40°C (8% torque derate per 1000m altitude)
    • Storage Temperature: -40°C ~ +85°C
    • Assembly Protection Rating: IP54 after customer full mechanical encapsulation
    • Vibration Grade: IEC 60034-14 Vibration Grade 1

Functional Features

  • Frameless split stator-rotor kit structure allows fully custom mechanical integration into machine spindle, rotary indexing table and turntable assemblies
  • Large 150mm hollow central bore enables wiring, gas pipeline, fixture transmission shaft to pass through motor center without mechanical interference
  • Ultra-high stall torque maintains stable positioning accuracy under long-duration static holding load without mechanical locking devices
  • Ultra-low cogging torque ensures smooth micro-angle rotation at 0.1 RPM ultra-low speed precision adjustment
  • Embedded PTC thermal sensor provides real-time winding temperature feedback to servo drive for automatic torque derating protection
  • 320VDC high-voltage winding reduces operating current, minimizing heat loss in long-distance stator power cables
  • Compatible with full AKD series servo drives with universal multi-feedback signal interface for closed-loop position control

Working Principle

Three-phase sinusoidal variable frequency current output from matched AKD servo drive energizes frameless stator distributed windings, generating rotating electromagnetic magnetic field. The inner ring surface-mounted NdFeB permanent magnet rotor synchronously tracks stator rotating magnetic field to generate large direct drive rotary torque without intermediate gear reduction components. External high-precision rotary encoder mounted on customer machine spindle captures real-time angular position signal and transmits back to servo drive to close position control loop. Embedded PTC thermal sensor continuously monitors stator winding core temperature, transmitting over-temperature alarm signal to drive once exceeding threshold value to activate torque reduction or safe shutdown logic.

Material Composition

  • Stator Lamination Core: 0.3mm grain-oriented low-loss silicon steel stacked lamination
  • Stator Winding Enamel Wire: High-temperature polyimide insulated copper magnet wire
  • Rotor Magnet: Grade N40SH neodymium iron boron rare earth magnet with epoxy full encapsulation anti-corrosion treatment
  • Magnet Retention Sleeve: 4130 alloy steel thin-wall shrink-fit sleeve
  • Winding Insulation Barrier: Nomex high-temperature insulating paper
  • Terminal Lead Cable: Silicone high-temperature resistant multi-core shielded cable
  • Thermal Sensor Housing: High-temperature PTFE insulation sleeve

Structural Characteristics

  • Split frameless two-piece assembly: outer ring stator winding unit, inner ring permanent magnet rotor unit
  • Large central hollow through-bore design with standard 150mm inner diameter for media and shaft penetration
  • Short axial stack length of 52mm saves machine radial installation space for compact rotary equipment design
  • Uniformly distributed stator winding layout to eliminate torque ripple during low-speed rotation
  • External stator mounting flange with evenly distributed threaded mounting holes for customer frame bolt fastening
  • Rotor inner surface smooth interference fit structure for shrink assembly onto customer machine main spindle

Advantage Highlights

  • Direct drive structure removes gearbox backlash, improving rotary positioning repeat accuracy to ±0.001°
  • Large hollow central bore simplifies complex automation equipment media routing and fixture mechanical layout
  • Ultra-high continuous stall torque eliminates external brake mechanism requirement for static heavy load holding
  • Near-zero cogging torque realizes ultra-smooth micro-angle precision adjustment for optical inspection and precision machining equipment
  • Frameless split kit reduces overall machine volume and weight compared to integrated housed torque motors
  • F-class high-temperature insulation supports long-duration full torque continuous stall operation under rated ambient temperature
  • Wide feedback compatibility matches all mainstream industrial rotary encoder products without drive hardware modification

Applicable Industries

Precision rotary indexing tables, optical inspection turntables, vertical machining center rotary spindles, semiconductor wafer rotary stages, medical CT rotary scanning equipment, laser rotary positioning automation, high-precision testing rotary fixtures

Installation Requirements

  1. Complete rotor shrink-fit assembly onto customer spindle with interference tolerance of 0.008mm ~ 0.015mm; heating rotor uniformly to 120°C for assembly
  2. Stator outer ring mounted to machine fixed frame with M6 screws, tightening torque 4 N·m; mounting surface flatness tolerance ≤0.04mm per 100mm
  3. Maintain air gap between stator inner bore and rotor outer circle strictly at 0.6mm ±0.05mm uniform clearance around full circumference
  4. Separate stator three-phase power cable and feedback signal cable routing with minimum 15mm spacing to avoid electromagnetic interference
  5. All wiring terminals must be fixed with cable ties to prevent wire abrasion during spindle high-speed reciprocating rotation
  6. Install external independent cooling air duct for stator winding if equipment internal ambient temperature exceeds +40°C

Operation Precautions

  • Continuous stall operation above +40°C ambient requires 20% reduction of rated continuous torque output
  • Strictly prohibit stator and rotor contact friction during assembly and operation; magnet surface scratch leads to irreversible torque attenuation
  • Do not exceed maximum mechanical speed of 350 RPM to avoid rotor magnet centrifugal shedding failure
  • Protect winding terminal cables from sharp machine structure edges to prevent insulation breakdown short circuit
  • Regularly check air gap uniformity every 1000 operating hours to eliminate spindle bearing wear-induced eccentric friction risk
  • Avoid repeated rapid forward/reverse rotation with peak torque lasting longer than 10 seconds to prevent winding over-temperature damage

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