BLMF Series (Ironless) Linear Motor

Description

Design Features

  • Non-magnetic forcer provides high force with zero cogging for super-smooth velocity and position control
  • Continuous force to 112.1 N (25.2 lb); peak force to 448.4 N (100.8 lb)
  • Unlimited travel length by stacking magnet tracks
  • High-energy, rare-earth magnets used in magnet track for high acceleration capability
  • Follows the 2011/65/EU RoHS 2 Directive

The BLMF series linear motors are designed to provide a lower cost and lower profile alternative to conventional linear motor applications. The BLMFI forcer contains no magnetic material to achieve zero cogging and magnetic attraction. This allows for extremely smooth motion and very tight velocity and position control.

The forcer assembly contains Hall-effect devices, and a thermal sensor, and is a compact, reinforced ceramic epoxy structure.

Offering high peak forces in its standard configuration, BLMF motors are available with higher-power magnets that can be used to increase output force.

These linear motors are ideal for any application requiring high levels of positioning resolution and accuracy. Tracks are stackable for any travel length. The BLMF linear motors are also for cleanroom use as they produce no particulates.

The BLMF 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

BLMFI "Ironless" Forcer Models

Motor ModelUnitsBLMFI-81BLMFI-142BLMFI-264BLMFI-325BLMFI-386
Performance Specifications(1,5)
Continuous
Force,
No Forced Cooling(2)
N (lb) 22.7 (5.1) 39.3 (8.8) 78.6 (17.7) 109.4 (24.6) 136.0 (30.6)
Peak Force(3) N (lb) 90.6 (20.4) 157.3 (35.4) 314.2 (70.6) 437.5 (98.4) 543.9 (122.3)
Attraction Force N (lb) 0 0 0 0 0
Electrical Specifications(5)
Winding Designation   A B A B A B A B A B
BEMF Constant
(Line-Line, Max)
V/(m/s)
(V/(in/s))
8.68 (0.22) 4.34 (0.11) 16.75 (0.43) 8.37 (0.21) 17.37 (0.44) 34.73 (0.88) 22.45 (0.57) 44.90 (1.14) 27.91 (0.71) 55.82 (1.42)
Continuous
Current,
No Forced Cooling(2)
Apk
Arms
3.0
2.12
6.00
4.24
2.70
1.91
5.40
3.82
5.20
3.68
2.60
1.84
5.60
3.96
2.80
1.98
5.60
3.96
2.80
1.98
Peak Current, Stall(3) Apk
Arms
12.00
8.49
24.00
16.97
10.80 7.64 21.60
15.27
20.80 14.71 10.40
7.35
22.40 15.84 11.20
7.92
22.40 15.84 11.20
7.92
Force Constant,
Sine Drive(4,8)
N/Apk (lb/Apk) 7.55 (1.70) 3.78 (0.85) 14.57 (3.28) 7.28 (1.64) 15.11 (3.40) 30.21 (6.79) 19.53 (4.39) 39.06 (8.78) 24.28 (5.46) 48.56 (10.92)
N/Arms (lb/Arms) 10.68 (2.40) 5.34 (1.20) 20.60 (4.63) 10.30 (2.32) 21.36 (4.80) 42.73 (9.61) 27.62 (6.21) 55.24 (12.42) 34.34 (7.72) 68.67 (15.44)
Motor Constant(2,4) N/√W
(lb/√W)
3.14
(0.71)
4.31
(0.97)
6.40
(1.44)
7.48
(1.68)
8.38
(1.88)
Resistance, 25°C (Line-Line) Ω 5.5 1.4 10.9 2.7 5.3 21.2 6.5 26.0 8.0 32.0
Inductance (Line-Line) mH 2.9 0.73 6.50 1.63 3.50 14.00 4.48 17.92 5.30 21.20
Thermal Resistance, No Forced Cooling °C/W 1.92 1.20 0.66 0.47 0.38
Maximum Bus Voltage VDC 340 340 340 340 340
Mechanical Specifications
Coil Weight kg (lb) 0.50 (1.10) 0.84 (1.85) 1.10 (2.42) 1.40 (3.08) 1.70 (3.74)
Coil Length mm (in) 81.0 (3.19) 142.2 (5.60) 264.2 (10.40) 325.1 (12.80) 386.1 (15.20)
Heat Sink mm
(in)
100x100x13
(4x4x0.5)
150x150x13 (6x6x0.5) 300x300x13 (12x12x0.5) 350x350x13 (14x14x0.5) 400x400x13 (16x16x0.5)
Magnet Track Weight kg/m (lb/ft) 4.70
(3.15)
Magnetic Pole Pitch mm (in) 30.00 (1.18) 30.00 (1.18) 30.00 (1.18) 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 @ 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

  • BLMF

Ordering Information

Ordering Example

BLMFI -81 -A

Options

Motor SeriesForcer Length Code
Standard Winding
BLMFI 81
142
264
325
386
76 cm (2.5 ft) flying leads std

Brushless Linear Servomotors - BLMFI Series Flat Ironless Forcers

Option Description
BLMFI-81-A Flat linear motor coil, ironless design for zero cogging with HED and temperature switch, Fcont=22.7 N (5.1 lb) no cooling
BLMFI-142-A Flat linear motor coil, ironless design for zero cogging with HED and temperature switch, Fcont=39.3 N (8.8 lb) no cooling
BLMFI-264-A Flat linear motor coil, ironless design for zero cogging with HED and temperature switch, Fcont=78.6 N (17.7 lb) no cooling
BLMFI-325-A Flat linear motor coil, ironless design for zero cogging with HED and temperature switch, Fcont=109.4 N (24.6 lb) no cooling
BLMFI-386-A Flat linear motor coil, ironless design for zero cogging with HED and temperature switch, Fcont=136.0 N (30.6 lb) no cooling

BLMFI Options

Option Description
-LH Remove HED sensor from BLMFI series forcer
-B Optional winding
-V Vacuum prepared

Flat Magnet Tracks - MTFxxxP Series for BLMF motors

Option Description
MTF240P Flat magnet track, for use with BLMFI or BLMFS forcer, 240 mm (9.4 in) length
MTF360P Flat magnet track,for use with BLMFI or BLMFS forcer, 360 mm (14.2 in) length
MTF480P Flat magnet track, for use with BLMFI or BLMFS forcer, 480 mm (18.9 in) length
MTFxxxP Custom flat magnet track length available. Please consult factory.