Akribis atr(en) 040712 brochure

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Revolutionary Design

The ATR series is the latest revolutionary direct drive motor from Akribis Systems. The patent pending

design enables the motor to have very high torque, yet the motor rotor inertia is very low.

Conventional design ATR design (patent pending)

In a conventional DDR motor design, a rotor back iron is necessary for the magnetic circuit to be closed.

This rotor back iron adds to the rotating inertia of the motor. In fact, in many fast indexing applications,

much of the motor torque is used to overcome the inertia of the motor itself, leaving little torque for the

load. To increase motor torque, a motor with a larger diameter is selected. However, this results in higher

rotor inertia, which in turn requires higher torque. The selection process results in an endless cycle with

no optimal solution.

No magnet back iron

In our ATR design, no back iron is needed in the rotor. This reduces the rotor inertia significantly.

Moreover, our design results in higher torque output. The combined features of higher torque and lower

rotor inertia give the ATR excellent dynamic performance.

Rotor structure

The figure above shows our rotor structure design. The magnets are not attached to any back iron material

but are mounted on the rotor structure, which is made of low density material with high stiffness.



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Comparison with other conventional DDR motors

YA KM YG ATR172

Brand/Model Unit Brand YA Brand KM Brand YG Akribis ATR175 Our advantages

Outer diameter mm 175.0 175.2 190.0 (205.0) 175.0 Similar diameter

Motor height mm 130.0 168.0 156.0 163.0 Similar height

Peak torque Nm 42.0 51.5 30.0 101.8 Highest peak torque

Continuous torque Nm 14.0 19.7 Not published 33.9 Highest continuous torque

Max Speed (230 VAC) rpm 300 498 120 664 Highest speed

Rotor Inertia Kgm2 0.0220 0.0071 0.0720 0.0044 Lowest rotor inertia

The table above shows a comparison of the ATR with well known conventional DDR motors from USA

and Japan. The ATR172 has the best performance.

Excellent dynamic performance

With high torque and low rotor inertia, the ATR is ideal for fast, indexing motion. The graph above shows

a motion of 90 degrees, in just 36 ms, for ATR152 motor.



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ATR152-138 ATR152-138A ATR152-138W

Standard Air Cool Water Cool

Specifications Units S P S P S P

Table diameter mm 152 152 152 152 152 152

Table height mm 138 138 138 138 138 138

Number of poles 16 16 16 16 16 16

Continuous torque Nm 17.8 17.8 20.5 20.5 35.6 35.6

Peak torque Nm 53.5 53.5 53.5 53.5 53.5 53.5

Torque constant Nm/A 5.15 2.58 5.15 2.58 5.15 2.58

Back EMF constant V/rpm 0.623 0.311 0.623 0.311 0.623 0.311

Continuous current A 3.5 6.9 4.0 8.0 6.9 13.8

Peak current A 10.4 20.8 10.4 20.8 10.4 20.8

Continuous power W 91.9 91.9 121.6 121.6 367.8 367.8

Peak power W 827.5 827.5 827.5 827.5 827.5 827.5

Resistance 1 ohms 7.68 1.92 7.68 1.92 7.68 1.92

Inductance 1 mH 66.00 16.50 66.00 16.50 66.00 16.50

Electrical time constant ms 8.6 8.6 8.6 8.6 8.6 8.6

Motor constant Nm/SqRt(W) 1.86 1.86 1.86 1.86 1.86 1.86

Mass Kg 8.5 8.5 8.5 8.5 8.5 8.5

Rotor Inertia Kgm2 0.001587 0.001587 0.001587 0.001587 0.001587 0.001587

Rec. max speed @230V AC rpm 354 835 354 835 354 835

MS-16384 optical SINCOS encoder lines 16,384 16,384 16,384 16,384 16,384 16,384

MS-16384 optical digital encoder (40X) Counts/rev 655,360 655,360 655,360 655,360 655,360 655,360

Radial runout 2 um 20 20 20 20 20 20

Axial runout 2 um 5 5 5 5 5 5

Maximum axial load N 1,500 1,500 1,500 1,500 1,500 1,500

Maximum moment load Nm 48 48 48 48 48 48

1. Terminal to terminal, at 25 Deg C. 2. Values are based on axis of rotation (bearings) runout only. Surface or tabletop runout is not part of the specification.

ATR175-162 ATR175-162A ATR175-162W




Table height mm 162 162 162 162 162 162

Number of poles 16 16 16 16 16 16


Peak torque Nm 101.8 101.8 101.8 101.8 101.8 101.8




Peak current A 15.9 31.8 15.9 31.8 15.9 31.8


Peak power W 1,365.2 1,365.2 1,365.2 1,365.2 1,365.2 1,365.2

Resistance 1 ohms 5.40 1.35 5.40 1.35 5.40 1.35

Inductance 1 mH 37.26 9.30 37.26 9.30 37.26 9.30



Mass Kg 13.9 13.9 13.9 13.9 13.9 13.9





Radial runout 2 um 20 20 20 20 20 20







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ATR220-163 ATR220-163A ATR220-163W




Table height mm 163 163 163 163 163 163

Number of poles 24 24 24 24 24 24


Peak torque Nm 196.7 196.7 196.7 196.7 196.7 196.7




Peak current A 14.4 28.8 14.4 28.8 14.4 28.8


Peak power W 862.6 862.6 862.6 862.6 862.6 862.6

Resistance 1 ohms 4.16 1.04 4.16 1.04 4.16 1.04

Inductance 1 mH 37.20 9.30 37.20 9.30 37.20 9.30



Mass Kg 22.3 22.3 22.3 22.3 22.3 22.3





Radial runout 2 um 25 25 25 25 25 25





ATR152-138



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ATR152-138A

ATR175-162



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ATR175-162A _162W

ATR220-163



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ATR220-163A_163W

Part Numbering

Motor Height Cooling Winding Thermal Sensor Cable Length Encoder Option Interpolation Option

ATR152 138 Blank/A/W S/P J/K 3.0 MS-16384 40X/SINCOS

J- Thermostat

K- PT100 (RTD)

Example: ATR152-138-P-J-3.0-MS-16384-40X



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Akribis atr(en) 040712 brochure