Design Features

The BLMH series "U-channel" brushless linear servomotors offer over 70% greater continuous output force in the same physical envelope than similar models from other manufacturers. BLMH series motors feature a high-efficiency magnetic circuit design that provides continuous force ratings to 548.8 N (123.4 lb) and peak forces to 2195 N (493.5 lb). This extremely high level of performance can be enhanced with special magnet options that increase force further, thereby lowering heat generation.

BLMH series linear motors are direct drive and consist of a noncontact forcer assembly with Hall-effect devices, a thermal sensor, and "U-channel" magnet track. This design eliminates magnetic attraction to allow for extremely smooth motion and very tight velocity and position control. In addition, backlash, windup, wear and maintenance issues associated with ball screws, belts, and rack and pinions are eliminated.

The BLMH 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 speeds with high loads. BLMH 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 industrial usage.

The BLMH 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

BLMH Series Specifications

Motor ModelUnitsBLMH-142BLMH-202BLMH-262BLMH-322BLMH-382
Performance Specifications(1,5)
Continuous Force, 1.4 bar, 20 psi(2)N (lb)270.7 (60.9)351.2 (79.0)437.1 (98.3)489.2 (110.0)AB (opt)
435.8 (98.0)548.8 (123.4)
Continuous Force, No Forced Cooling(2)N (lb)150.0 (33.7)194.2 (43.7)266.2 (59.9)303.2 (68.2)357.9 (80.5)
Peak Force(3)N (lb)1082.7 (243.4)1404.9 (315.9)1748.6 (393.1)1956.7 (439.9)2195.0 (493.5)
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))		32.11
(0.82)		64.22
(1.63)		47.50
(1.21)		95.00
(2.41)		64.42
(1.64)		128.85
(3.27)		79.20
(2.01)		158.40
(4.02)		45.71
(1.16)		91.42
(2.32)
Continuous Current, 1.4 bar, 20 psi(2)Apk
Arms		9.69
6.85		4.85
3.43		8.50 6.014.25
3.01		7.80
5.52		3.90
2.76		7.10
5.02		3.55
2.51		10.96 7.756.90
4.88
Continuous Current, 
No Forced Cooling(2)		Apk
Arms		5.37
3.80		2.69
1.90		4.70
3.32		2.35
1.66		4.75
3.36		2.38
1.68		4.40
3.11		2.20
1.56		9.00
6.36		4.50
3.18
Peak Current, Stall(3)Apk
Arms		38.76
27.41		19.38
13.70		34.00
24.04		17.00
12.02		31.20
22.06		15.60
11.03		28.40
20.08		14.20
10.04		55.20
39.03		27.60
19.52
Force Constant, Sine Drive(4,8)N/Apk(lb/Apk)27.93
(6.28)		55.87
(12.56)		41.32
(9.29)		82.64
(18.58)		56.04
(12.60)		112.09
(25.20)		68.90
(15.49)		137.80
(30.98)		39.77
(8.94)		79.53
(17.88)
N/Arms(lb/Arms)39.50
(8.88)		79.01
(17.76)		58.44
(13.14)		116.88
(26.28)		79.26
(17.82)		158.52
(35.64)		97.44
(21.91)		194.88
(43.81)		56.24
(12.64)		112.47
(25.29)
Motor Constant(2,4)N/√W
(lb/√W)		14.17
(3.19)		17.20
(3.87)		20.24
(4.55)		22.29
(5.01)		23.19
(5.21)
Resistance, 25°C (Line-Line)Ω3.714.85.522.07.329.29.136.42.811.2
Inductance (Line-Line)mH2.409.603.8015.204.6018.406.0024.001.807.20
Thermal Resistance, 
1.4 bar, 20 psi		°C/W0.270.240.210.210.18
Thermal Resistance,
No Forced Cooling		°C/W0.890.780.580.540.42
Maximum Bus VoltageVDC340340340340340
Mechanical Specifications
Air Flow (20 psi)m3/s
(SCFM)		2.5x10-3
(5.3)		2.8x10-3
(5.9)		2.8x10-3
(5.9)		2.9x10-3
(6.2)		2.7x10-3
(5.8)
Coil Weightkg (lb)1.10 (2.42)1.60 (3.52)2.10 (4.62)2.60 (5.72)3.10 (6.82)
Coil Lengthmm (in)142.0 (5.59)202.0 (7.95)262.0 (10.31)322.0 (12.68)382.0 (15.04)
Heat Sinkmm
(in)		250x250x25
(10x10x1)		250x250x25
(10x10x1)		250x250x25
(10x10x1)		250x400x25
(10x16x1)		250x400x25
(10x16x1)
Magnet Track Weightkg/m (lb/ft)20.4 (13.68)
Magnetic Pole Pitchmm (in)30.00 (1.18)
Standards
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

BLMH Brushless Linear Servomotor

OptionDescription
BLMH-142Linear motor forcer with thermistor; 142 mm long
BLMH-202Linear motor forcer with thermistor; 202 mm long
BLMH-262Linear motor forcer with thermistor; 262 mm long
BLMH-322Linear motor forcer with thermistor; 322 mm long
BLMH-382Linear motor forcer with thermistor; 382 mm long

Winding Designation (Required)

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

Air Cooling (Required)

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

Hall Effect Sensors (Required)

OptionDescription
-HHall effect sensors included
-NHNo Hall effect sensors included

Preparation (Required)

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

Cable Length (Required)

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

Magnet Tracks (Optional)

OptionDescription
MTH180P"U" channel magnet track for use with BLMH-series forcers; 180 mm long
MTH210P"U" channel magnet track for use with BLMH-series forcers; 210 mm long
MTH240P"U" channel magnet track for use with BLMH-series forcers; 240 mm long
MTH300P"U" channel magnet track for use with BLMH-series forcers; 300 mm long
MTH330P"U" channel magnet track for use with BLMH-series forcers; 330 mm long
MTH360P"U" channel magnet track for use with BLMH-series forcers; 360 mm long
MTH480P"U" channel magnet track for use with BLMH-series forcers; 480 mm long
MTH600P"U" channel magnet track for use with BLMH-series forcers; 600 mm long
MTH720P"U" channel magnet track for use with BLMH-series forcers; 720 mm long
MTHxP“U” channel magnet track for use with BLMH-series forcers; custom length

  1. Note: Magnet tracks are ordered as separate line items. Magnet track part numbers ending in "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.

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.