Coreless DC Motors
6413

16

Item

Description

1Rotor winding

2

Stator magnet

3

Commutator

4Brush5Bearing6

Housing/back iron52

Cutaway of the CL 66 coreless DC Motor

Coreless DC Motor
Technology

Advantages of Coreless DCMotors

Coreless DC MotorApplications

Coreless DC motors differ fromtraditional DC motors in significantways. The most obvious andimportant difference is the rotorwinding.

Allied Motion’s Coreless DC motors
have desirable attributes that makethem an excellent choice for many
applications:

Here are a few applications that
benefit from the inherent advantagesof coreless DC motors:• Coreless rotor technology meanssmooth, cog-free operation• Dialysis peristaltic and gear pumps• Low inertia rotor provides fast
acceleration compared to ironcore
DC motors• CPAP centrifugal blowers

Instead of coils wound around a stackof iron laminations, the coil is formed
as a thin hollow cylinder (item 1above).
The stator with its permanent
magnets (item 2) supplies themagnetic field flux and fits in thehollow center of the winding. It’s
rigidly affixed to the outside motor
housing (item 6), which completes
the magnetic circuit. The rotor is
supported by bearings (items 5) androtates around the magnetic core.
Coreless DC motors are usually smallin size, ranging from 6 mm (0.24") toless than 75 mm (3") in diameter.
Continuous power is normally limited
to 250 Watts or less.
They are a preferred choice for many
medical devices, small pumps, anddocument handling/dispensingequipment.

• Lighter weight than ironcore DCmotors• No iron loss means higher
efficiency (up to 85% versus 50%
for ironcore) for lower heat riseand longer battery life
• Zero detent and low ripple torque(<1.5%) for precision speed control• Low starting voltage (0.3 V) for
accurate low speed operation• Low inductance means extended
brush and commutator life
• Low time constant (typically 10 ms)
means sharper response capability

Medical Equipment• Ambulatory infusion pumps• Lab centrifuges, shakers and stirrers• X-ray shutter positioning drive
Banking and Office Automation:• Card readers• ATM machine cash dispensers• Coin counters / sorters
Other• Airplane entertainment system LCD
screen positioners• High-end audio turntable motors• Police / emergency tape recorders• Entrance door, window, andwindow shade automatic operators• Ticket printing/dispensing• Security camera pan and tilt drives• Laser leveling system drives

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

1Technology Ovr TO-CL03

Coreless DC Motors
Size (OD)[mm (in)]
CL 29

29 (1.14)

Power1Torque[Watt] [mNm (oz-in)]
310 (1.42)

Speed
[RPM]

Inertia[kgm2 (oz-in-s2)]

2400 2700

0.9E-6 (1.27E-4)

Voltages Commutation(VDC)
Brush Type6 - 24

Precious metal

Options• Encoder• Tachometer• Gearhead• EMI suppression• Ball bearings• Custom shaft/winding• Connector

CL 40 (7 W)

40(1.57)722 (3.12)

2600 3050

4E-6 (5.67E-4)

6 - 30Precious metal• Encoder• Tachometer• Gearhead• EMI suppression• Ball bearings• Custom shaft/winding• Connector

CL 40 (12 W)

40 (1.57)

1226 (3.68)

4100

4E-6 (5.67E-4)

12 - 30

Graphite-copper• Encoder• Gearhead• EMI suppression• Ball bearings• Custom shaft/winding• Connector

CL 66

66 (2.6)25100 (14.2)

1800 2540

21E-6 (2.97E-3)

12 - 36Graphite-copper• Encoder• Gearhead• EMI suppression• Custom shaft/winding• Connector
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-CL03