Design Features

Aerotech's "U-channel" BLM series linear motors are 86.4 mm x 34.3 mm in cross section and have proven ideal for both high-accuracy and high-throughput applications.

BLM series motors are direct drive and consist of a noncontacting 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 noncontact design of the forcer and magnet track results in a maintenance-free system.

The compact 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. For highest rms force, optional air cooling is available. Offering high peak forces in its standard configuration, BLM motors are available with special high-power magnets that can increase output force.

The BLM 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 any application that requires high levels of positioning resolution and accuracy. BLM 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. They are also suited for cleanroom use as they produce no particulates.

The BLM 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.

Specifications

BLM Series Specifications

MOTOR MODEL
(P Magnet Track)		UNITSBLM-142BLM-203BLM-264BLM-325BLM-386
PERFORMANCE SPECIFICATIONS (1,5)
Continuous Force, 1.4 bar, 20 psi(2)N (lb)AB (opt)251.6 (56.6)301.7 (67.8)332.2 (74.7)397.6 (89.4)
173.2 (38.9)158.7 (35.7)
Continuous Force, No Forced Cooling(2)N (lb)110.5 (24.8)153.3 (34.5)197.2 (44.3)230.7 (51.9)257.3 (57.8)
Peak Force(3)N (lb)692.7 (155.7)1006.4 (226.3)1206.6 (271.3)1328.6 (298.7)1590.4 (357.5)
ELECTRICAL SPECIFICATIONS(5)
Winding Designation
AB (opt)AB (opt)AB (opt)AB (opt)AB (opt)
BEMF Constant (Line-Line, Max)V/(m/s)
(V/(in/s))		40.96
(1.04)		20.48
(0.52)		33.24
(0.84)		66.49
(1.69)		44.46
(1.13)		88.91
(2.26)		53.03
(1.35)		106.06
(2.69)		67.21
(1.71)		134.42
(3.41)
Continuous Current, 1.4 bar, 20 psi(2)Apk
Arms		4.86
3.44		8.91
6.30		8.70
6.15		4.35
3.08		7.80
5.52		3.90
2.76		7.20
5.09		3.60
2.55		6.80
4.81		3.40
2.40
Continuous Current, No Forced Cooling(2)Apk
Arms		3.10
2.19		6.20
4.38		5.30
3.75		2.65
1.87		5.10
3.61		2.55
1.80		5.00
3.54		2.50
1.77		4.40
3.11		2.20
1.56
Peak Current, Stall(3)Apk
Arms		19.44
13.75		38.88
27.49		34.80
24.61		17.40
12.30		31.20
22.06		15.60
11.03		28.80
20.36		14.40
10.18		27.20
19.23		13.60
9.62
Force Constant, Sine Drive(4,8)N/Apk(lb/Apk)35.63
(8.01)		17.82
(4.01)		28.92 (6.50)57.84
(13.00)		38.67
(8.69)		77.35
(17.39)		46.13
(10.37)		92.27
(20.74)		58.47
(13.15)		116.94
(26.29)
N/Arms(lb/Arms)50.39
(11.33)		25.20
(5.66)		40.90
(9.19)		81.80
(18.39)		54.69
(12.30)		109.39
(24.59)		65.24
(14.67)		130.48
(29.34)		82.69
(18.59)		165.38
(37.18)
Motor Constant(2,4)N/√W
(lb/√W)		10.53 
(2.37)		14.11 
(3.17)		16.39 
(3.69)		17.66 
(3.97)		20.17 
(4.54)
Resistance, 25°C (Line-Line)Ω10.92.74.016.05.321.26.526.08.032.0
Inductance 
(Line-Line)		mH8.702.183.2012.804.2016.805.2020.806.2024.80
Thermal Resistance, 1.4 bar, 20 psi°C/W0.370.310.300.280.26
Thermal Resistance, No Forced Cooling°C/W0.910.850.690.590.61
Maximum Bus VoltageVDC340340340340340
MECHANICAL SPECIFICATIONS
Air Flow, 20 psim3/s
(SCFM)		1.7x10-3
(3.5)		1.5x10-3
(3.2)		1.6x10-3
(3.3)		1.6x10-3
(3.3)		1.6x10-3
(3.4)
Coil Weightkg (lb)0.60 (1.32)0.90 (1.98)1.10 (2.42)1.40 (3.08)1.70 (3.74)
Coil Lengthmm (in)143.8 (5.66)204.7 (8.06)265.7 (10.46)326.6 (12.86)387.6 (15.26)
Heat Sink Areamm
(in)		250x250x25
(10x10x1)		250x250x25
(10x10x1)		250x250x25
(10x10x1)		250x400x25
(10x16x1)		250x400x25
(10x16x1)
Magnet Track Weightkg/m (lb/ft)10.12 (6.79)10.12 (6.79)10.12 (6.79)10.12 (6.79)10.12 (6.79)
Magnetic Pole Pitchmm (in)30.48 (1.20)30.48 (1.20)30.48 (1.20)30.48 (1.20)30.48 (1.20)
Standards
2011/65/EU RoHS 2 Directive

  1. Performance is dependent upon heat sink configuration, system cooling conditions, and ambient temperature.

  2. Values shown @ 100°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 125°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.

 

    MOTOR MODEL
    (S magnet track)    		UNITSBLM-142BLM-203BLM-264BLM-325BLM-386
    PERFORMANCE SPECIFICATIONS (1,5)
    Continuous Force, 
    1.4 bar, 20 psi(2)    		N (lb)AB (opt)158.2 (35.6)189.6 (42.6)208.8 (46.9)250.0 (56.2)
    108.9 (24.5)99.8 (22.4)
    Continuous Force, 
    No Forced Cooling(2)    		N (lb)69.4 (15.6)96.4 (21.7)124.0 (27.9)145.0 (32.6)161.7 (36.4)
    Peak Force(3)N (lb)435.5 (97.9)632.7 (142.2)758.6 (170.5)835.3 (187.8)999.8 (224.8)
    ELECTRICAL SPECIFICATIONS(5)
    Winding Designation
    		AB (opt)AB (opt)AB (opt)AB (opt)AB (opt)
    BEMF Constant 
    (Line-Line, Max)    		V/(m/s)
    (V/(in/s))    		25.75
    (0.65)    		12.88
    (0.33)    		20.90 
    (0.53)    		41.80
    (1.06)    		27.95
    (0.71)    		55.90
    (1.42)    		33.34
    (0.85)    		66.68
    (1.69)    		42.25
    (1.07)    		84.51
    (2.15)
    Continuous Current, 1.4 bar, 20 psi(2)Apk
    Arms    		4.86
    3.44    		8.91
    6.30    		8.70
    6.15    		4.35
    3.08    		7.80
    5.52    		3.90
    2.76    		7.20
    5.09    		3.60
    2.55    		6.80
    4.81    		3.40
    2.40
    Continuous Current, No Forced Cooling(2)Apk
    Arms    		3.10
    2.19    		6.20
    4.38    		5.30
    3.75    		2.65
    1.87    		5.10
    3.61    		2.55
    1.80    		5.00
    3.54    		2.50
    1.77    		4.40
    3.11    		2.20 
    1.56
    Peak Current, Stall(3)Apk
    Arms    		19.44
    13.75    		38.88
    27.49    		34.80
    24.61    		17.40
    12.30    		31.20
    22.06    		15.60
    11.03    		28.80
    20.36    		14.40
    10.18    		27.20
    19.23    		13.60
    9.62
    Force Constant, 
    Sine Drive(4,8)    		N/Apk(lb/Apk)22.40
    (5.04)    		11.20
    (2.52)    		18.18
    (4.09)    		36.36
    (8.17)    		24.31
    (5.47)    		48.63
    (10.93)    		29.00
    (6.52)    		58.01
    (13.04)    		36.76
    (8.26)    		73.52
    (16.53)
    N/Arms(lb/Arms)31.68
    (7.12)    		15.84
    (3.56)    		25.71
    (5.78)    		51.42
    (11.56)    		34.38
    (7.73)    		68.77
    (15.46)    		41.02
    (9.22)    		82.03
    (18.44)    		51.98
    (11.69)    		103.97
    (23.37)
    Motor Constant(2,4)N/√W
    (lb/√W)    		6.62 
    (1.49)    		8.87
    (1.99)    		10.31 
    (2.32)    		11.10
    (2.50)    		12.68
    (2.85)
    Resistance, 25°C (Line-Line)Ω10.92.74.016.05.321.26.526.08.032.0
    Inductance (Line-Line)mH8.702.183.2012.804.2016.805.2020.806.2024.80
    Thermal Resistance, 1.4 bar, 20 psi°C/W0.370.310.300.280.26
    Thermal Resistance, No Forced Cooling°C/W0.910.850.690.590.61
    Maximum Bus VoltageVDC340340340340340
    MECHANICAL SPECIFICATIONS
    Air Flow, 20 psim3/s
    (SCFM)    		1.7x10-3
    (3.5)    		1.5x10-3
    (3.2)    		1.6x10-3
    (3.3)    		1.6x10-3
    (3.3)    		1.6x10-3
    (3.4)
    Coil Weightkg (lb)0.60 (1.32)0.90 (1.98)1.10 (2.42)1.40 (3.08)1.70 (3.74)
    Coil Lengthmm (in)143.8 (5.66)204.7 (8.06)265.7 (10.46)326.6 (12.86)387.6 (15.26)
    Heat Sink Areamm
    (in)    		250x250x25
    (10x10x1)    		250x250x25
    (10x10x1)    		250x250x25
    (10x10x1)    		250x400x25
    (10x16x1)    		250x400x25
    (10x16x1)
    Magnet Track Weightkg/m (lb/ft)10.92 (7.32)10.92 (7.32)10.92 (7.32)10.92 (7.32)10.92 (7.32)
    Magnetic Pole Pitchmm (in)30.48 (1.20)30.48 (1.20)30.48 (1.20)30.48 (1.20)30.48 (1.20)
    Standards
    		2011/65/EU RoHS 2 Directive

    1. Performance is dependent upon heat sink configuration, system cooling conditions, and ambient temperature.

    2. Values shown @ 100°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 125°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..

    Dimensions

    Ordering Information

    BLM Brushless Linear Servomotor

    OptionDescription
    BLM-142Linear motor forcer with thermistor; 142 mm long
    BLM-203Linear motor forcer with thermistor; 203 mm long
    BLM-264Linear motor forcer with thermistor; 264 mm long
    BLM-325Linear motor forcer with thermistor; 325 mm long
    BLM-386Linear motor forcer with thermistor; 386 mm long
    BLM-xLinear motor forcer with thermistor; custom length

    Winding

    OptionDescription
    -A76 cm (2.5 ft) flying leads (standard)
    -BOptional winding

    Air Cooling

    OptionDescription
    -NCNo air cooling fitting is installed
    -ACIncludes air cooling fitting

    Hall Effect

    OptionDescription
    -HHall effect sensors included
    -NHNo hall effect sensors included

    Preparation

    OptionDescription
    -SStandard preparation
    -VVacuum preparation for 10-6 Torr
    -UHVUltra-high vacuum preparation, contact factory

    Cable Length

    OptionDescription
    -750750 mm length high-flex cables
    -50005.0 meter length high-flex cables

    Magnet Tracks

    OptionDescription
    MT180P"U" channel magnet track for use with BLM-series forcers, 180 mm long
    MT240P"U" channel magnet track for use with BLM-series forcers, 240 mm long
    MT300P"U" channel magnet track for use with BLM-series forcers, 300 mm long
    MT330P"U" channel magnet track for use with BLM-series forcers, 330 mm long
    MT360P"U" channel magnet track for use with BLM-series forcers, 360 mm long
    MT420P"U" channel magnet track for use with BLM-series forcers, 420 mm long
    MT540P"U" channel magnet track for use with BLM-series forcers, 540 mm long
    MT480P"U" channel magnet track for use with BLM-series forcers, 480 mm long
    MT600P"U" channel magnet track for use with BLM-series forcers, 600 mm long
    MTxP"U" channel magnet track for use with BLM-series forcers; custom length
    MT240S"U" channel magnet track for use with BLM-series forcers, 240 mm long
    MT300S"U" channel magnet track for use with BLM-series forcers, 300 mm long
    MT360S"U" channel magnet track for use with BLM-series forcers, 360 mm long
    MT420S"U" channel magnet track for use with BLM-series forcers, 420 mm long
    MT540S"U" channel magnet track for use with BLM-series forcers, 540 mm long
    MT480S"U" channel magnet track for use with BLM-series forcers, 480 mm long
    MT600S"U" channel magnet track for use with BLM-series forcers, 600 mm long
    MTxS"U" channel magnet track for use with BLM-series forcers; custom length

    1. 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. Magnet track numbers ending with “S” are standard performance grade, including magnets on a single side 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.

    OptionDescription
    -TASIntegration - 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.
    -TACIntegration - 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.