U9M4LR

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The U9M4LR motor boasts a peak torque of 447 oz-in (315 N-cm), a rated continuous torque of 45 oz-in (32 N-cm) at 25°C, a rated speed of 3000 RPM, and a peak current of 137 Amps. Part of the ServoDisc Pancake DC Motors by Kollmorgen, it delivers a rated power output of 101 Watts and a maximum recommended speed of 6000 RPM.

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Product Description:

Offered by Kollmorgen, the U9M4LR motor has a round frame. This motor also portrays a flat disc armature. The product is noted for its excellent speed control. This device has a unique design because of the absence of iron in its core. The unit is a great option for motion control applications. Its compact size ensures that it takes up minimum space for installation. This motor comes with its permanent magnets mounted on the endplates.

The product has a thin armature that results in a favorable torque-to-inertia ratio. This device encompasses brushes with a long life. The unit has no cogging because the armature is not attracted by the magnets. It is associated with low inductance. This motor is compatible with the manufacturer’s KXA Plus amplifier and EM19 linear amplifier. The product can be used in applications where a low profile is required. This device has a high throughput rate. The unit is also capable of producing a peak torque almost throughout the application. It has a very low inductance that in turn causes no arcing.

This motor is characterized by an axial magnetic field. The product delivers a closer physical sampling. This device can be fitted with tachometers if needed. The unit produces low radio frequency interference when it is operated. It needs a proper earth connection before it is turned on. This motor produces a high electrical voltage at the time of its operation. The product should be connected only when it is not in the energized state. This device helps to save space at the site of installation. The unit should not be opened by the user for maintenance or repair. It must not be immersed in liquid for cleaning purposes.

Armature Resistance
0.175 Ohms
Back Emf Constant
2.43 V/KRPM
Continuous Stall Torque
35 oz-in (25 N-cm)
Maximum Recommended Speed
6000 RPM
Moment Of Inertia
0.0056 oz-in-sec² (0.40 kg-m²)
Peak Current
137 Amps
Peak Torque
447 oz-in (315 N-cm)
Rated Continuous Current
15.6 Amps
Rated Continuous Torque @ 25°c
45 oz-in (32 N-cm)
Rated Continuous Torque @ 40°c
41 oz-in (29 N-cm)
Rated Power Output
101 Watts
Rated Speed
3000 RPM
Rated Terminal Voltage
12.6 V
Terminal Resistance
0.365 Ohms
Torque Constant
3.29 oz-in/Amp (2.32 N-cm/Amp)

Frequently Asked Questions about U9M4LR:

Q: What is the tolerance of the terminal resistance of the U9M4LR motor?

A: The tolerance of the terminal resistance of the U9M4LR motor is +/-10%.

Q: What kind of frame does the U9M4LR motor have?

A: The U9M4LR motor has a round frame.

Q: What kind of magnetic field is generated by the magnets of the U9M4LR motor?

A: The magnets of the U9M4LR motor generate an axial magnetic field.

Q: What is the maximum radial load supported by the U9M4LR motor?

A: The maximum radial load supported by the U9M4LR motor is 25 lbs.

Q: What material is used to manufacture the armature of the U9M4LR motor?

A: The armature of the U9M4LR motor is manufactured using copper conductors.


Internal Product Review

  • ‘‘The U9M4LR motor has smooth rotation at any speed. With no iron in the armature, its brushes have a long life because there is no possibility of arcing throughout the operation period.’’

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