Outer Rotor Brushless DC Motors
2211453Item

5Description

1

Stator winding

2

Outer rotor with polering magnet

3Outer housing

4

Drive electronics

5Bearing

6Front end bell

4

Cutaway view of a KinetiMax brushless DC Motor
6

Outer Rotor Brushless DC
Motor Technology

Advantages of Outer Rotor
Brushless DC Motors

Outer Rotor Brushless DC
Motor Applications

Outer rotor brushless DC motors differ
from typical brushless DC motors inthat the rotor (item 2 above) issituated outside, instead of inside, thestator (item 1).

Allied Motion’s outer rotor brushless
DC motors posses desirable attributes
that make them an excellent choice
for many applications:

Here are some types of applications
that beneﬁt from the advantages ofouter rotor brushless DC motors:• Higher inertia and optimized
magnetic design of outer rotor
technology minimizes cogging• Gas analyzer membrane pumps

The stator consists of a multiphasewinding on a laminated core, and therotor consists of permanent magnet
segments or a molded ring afﬁxed tothe inner surface of a steel cup-likecomponent that is attached at one
end to the motor’s shaft.
The stator windings are fed withcurrents controlled in magnitude andsequence (commutated) to effectrotation of the rotor element just as
in a typical brushless motor.
Many Allied Motion outer rotor
brushless DC motors include
integrated drive electronics (item 4).
The sophistication of the integral
drive can range from a simple
unidirectional ﬁxed speed control toone with bidirectional, variable speed
characteristics.

• Outer rotor motors’ larger air gap
radius maximizes output torque• Outer rotor’s larger inertia helps“ride through” torque variations inpump applications• Polygon mirrors can be directly
mounted to the rotor for morerobust and compact scannerequipment• Higher pole count and inertia
mean more stable low speed
performance without feedback• Lower audible noise due to greater
inertia and reduced cogging isideal for use in “quiet” applications• Outer rotor designs are axiallyshorter than inner rotor designs forthe same performance level

Medical Equipment• Dialysis peristaltic blood pumps andclean-cycle gear pumps• CPAP sleep apnea machine
membrane pump
• Anesthesia ventilator breathing
system pump• Dental instruments pumps• Automated stirrers for medical(and chemical) instruments
Industrial Equipment• Inkjet high-speed marking machine
gear pumps• Laser scanning instruments• Industrial laser bar code readers
Other• Liquid Petroleum Gas (LPG) fuelpumps for “green” vehicles• Pilot ﬂight suit microclimate
cooling system pump
• Conveyor system check weighers

North America: 1 (888) 392-5543 • Europe: +31 (78) 621 9940 • Asia: +852 2607 4038
Allied Motion Technologies Inc.

1Technology Ovr TO-KX03

Outer Rotor Brushless DC MotorsKinetiMax 24

Size (OD)[mm (in)]Power1[Watt]

Torque[mNm(oz-in)]SpeedNo-load[RPM]

Inertia[kgm2(oz-in-s2)]

Voltages(VDC)

21 (0.827) [EE]
24 (0.945) [EB]

1.5
2.7

6 (0.85)

Up to 10000 RPM
Up to 7070 RPM

0.53E-6 (0.75E-4)
0.77E-6 (1.09E-4)

6, 12, 24

Options• Gearhead• IP30 protection• Custom leads andconnector conﬁguration• Custom shaft / ﬂange

KinetiMax 32 EB

31.2 (1.29)

12, 1632 (4.53)

4600, 6000

4.7E-6 (6.66E-4)• Gearhead

12, 24• IP54 protection• Custom leads andconnector conﬁguration• Custom shaft / ﬂange

KinetiMax 54 EB

54 (2.13)

81222 (3.12)30 (4.25)

4600

22E-6 (3.1E-3)
31E-6 (4.4E-3)• Gearhead

12, 24• IP30 protection• Custom leads andconnector conﬁguration• Custom shaft / ﬂange

KinetiMax 68 EB

68 (2.68)

35
50
50

80 (11.3)
114 (16.2)
170 (24.1)

6000
6000
3650

0.75E-4 (1.06E-2)
1.2E-4 (1.7E-2)
1.2E-4 (1.7E-2)• Gearhead24• IP54 protection• Custom leads andconnector conﬁguration• Custom shaft / ﬂange

1. Continuous ratings

Note: Blue-shaded area indicates optimum operational area for the motor

North America: 1 (888) 392-5543 • Europe: +31 (78) 621 9940 • Asia: +852 2607 4038
Allied Motion Technologies Inc.

2Technology Ovr TO-KX03