BLMX Series Linear Motor


Design Features

  • 49% greater continuous output force in the same physical envelope than competitive models
  • Continuous force to 1063 N (239 lb); peak force to 4252 N (956 lb)
  • 152.0 mm high x 50.8 mm wide cross section
  • Special magnet options available for increased force output
  • Follows the 2011/65/EU RoHS 2 Directive

The BLMX series "U-channel" brushless linear servomotors offer over 49% greater continuous output force in the same physical envelope than similar models from other manufacturers.

BLMX series motors feature a high-efficiency magnetic circuit design that provides continuous force ratings to 1063 N (239 lb) and peak forces to 4252 N (956 lb). This extremely high level of performance can be enhanced with special high-strength magnet options that increase force output.

The BLMX forcer assembly contains Hall-effect devices, and a thermal sensor, and is constructed of reinforced ceramic epoxy. This ironless design eliminates eddy-current losses that otherwise would limit speed and produce additional heat.

BLMX linear motors are direct drive and consist of a forcer and "U-channel" rare-earth magnet track. This design eliminates backlash, windup, wear and maintenance issues associated with ball screws, belts, and rack and pinions.

The BLMX series nonmagnetic forcer eliminates cogging and magnetic attraction to allow for extremely smooth motion and very tight velocity and position control. These linear motors are ideal for applications demanding the ultimate in force output. BLMX series linear motors are forgiving to align, easy to assemble, and keep the magnetic field well-contained. Magnet tracks are stackable for any travel length. These motors are well-suited for industrial applications.

The BLMX can be driven using standard Aerotech brushless amplifiers and controllers to provide a complete, integrated system.

Need help sizing your motor? Try Aerotech's Motor Sizer software to specify the ideal motor for your application.


BLMX Series Specifications

Motor ModelUnitsBLMX-382BLMX-502
Performance Specifications(1,5)
Continuous Force, 1.4 bar, 20 psi(2) N (lb) 972 (218) A B (opt)
1063 (239) 1011 (227)
Continuous Force,
No Forced Cooling(2)
N (lb) 537 (121) 601 (135)
Peak Force(3) N (lb) 3887 (874) 4252 (956)
Electrical Specifications(5)
Winding Designation   A B (opt) A B (opt)
BEMF Constant (Line-Line, Max) V/(m/s)
Continuous Current, 1.4 bar, 20 psi(2) Apk
Continuous Current,
No Forced Cooling(2)
Peak Current, Stall(3) Apk
Force Constant, Sine Drive(4,8) N/Apk
N/Arms (lb/Arms) 106.13 (23.86) 212.25 (47.72) 134.82 (30.31) 67.41
Motor Constant(2,4) N/√W (lb/√W) 39.72 (8.93) 46.23 (10.39)
Resistance, 25°C (Line-Line) Ω 3.4 13.6 4.5 1.1
Inductance (Line-Line) mH 3.0 12.0 4.0 1.0
Thermal Resistance, 1.4 bar, 20 psi °C/W 0.12 0.12
Thermal Resistance, No Forced Cooling °C/W 0.40 0.39
Maximum Bus Voltage VDC 340 340
Mechanical Specifications
Air Flow, 20 psi m3/s
Coil Weight kg (lb) 3.40 (7.48) 4.45 (9.79)
Coil Length mm (in) 382.0 (15.04) 502.0 (19.76)
Heat Sink mm (in) 250x400x25
Magnet Track Weight kg/m (lb/ft) 35.8 (24.01)
Magnetic Pole Pitch mm (in) 30.00 (1.18) 30.00 (1.18)
Standards   2011/65/EU RoHS 2 Directive
  1. Performance is dependent upon heat sink configuration, system cooling conditions, and ambient temperature.
  2. Values shown @ 65°C rise above a 25°C ambient temperature, with motor mounted to the specified aluminum heat sink.
  3. Peak force assumes correct rms current; consult Aerotech.
  4. Force constant and motor constant specified at stall.
  5. All performance and electrical specifications ±10%.
  6. Maximum winding temperature is 90°C.
  7. Ambient operating temperature range 0°C - 25°C. Consult Aerotech for performance in elevated ambient temperatures.
  8. All Aerotech amplifiers are rated Apk; use force constant in N/Apk when sizing.


Ordering Information

Brushless Linear Servomotors - BLMX Series Compact “U” Channel Forcer Coils

Option Description
BLMX-382 Linear motor forcer with thermistor; 382 mm long
BLMX-502 Linear motor forcer with thermistor; 502 mm long

Winding Designation (Required)

Option Description
-A 76 cm (2.5 ft) flying leads (standard)
-B Optional winding

Air Cooling (Required)

Option Description
-NC No air cooling fitting is installed
-AC Includes air cooling fitting

Hall Effect Sensors (Required)

Option Description
-H Hall effect sensors included
-NH No Hall effect sensors

Preparation (Required)

Option Description
-S Standard preparation
-V Vacuum preparation to 10-6 Torr
-UHV Ultra-high vacuum preparation; contact factory

Cable Length (Required)

Option Description
-750 750 mm length high-flex cables
-5000 5.0 meter length high-flex cables

Magnet Tracks (Optional)

Option Description
MTX480P "U" channel magnet track for use with BLMX-series forcers, 480 mm long
MTX600P "U" channel magnet track for use with BLMX-series forcers, 600 mm long
MTX720P "U' channel magnet track for use with BLMX-series forcers, 720 mm long
MTXxP "U" channel magnet track for use with BLMX-series forcers; custom length
    Note: Magnet tracks are ordered as separate line items. Magnet track part numbers ending with "P" are high performance grade, including magnets on both sides of the track.

Integration (Required)

Aerotech offers both standard and custom integration services to help you get your system fully operational as quickly as possible. The following standard integration options are available for this system. Please consult Aerotech if you are unsure what level of integration is required, or if you desire custom integration support with your system.

Option Description
-TAS Integration - Test as system
Testing, integration, and documentation of a group of components as a complete system that will be used together (ex: drive, controller, and stage). This includes parameter file generation, system tuning, and documentation of the system configuration.
-TAC Integration - Test as components
Testing and integration of individual items as discrete components that ship together. This is typically used for spare parts, replacement parts, or items that will not be used together. These components may or may not be part of a larger system.