KOLLMORGEN AKM series synchronous servo motor

KOLLMORGEN AKM series synchronous servo motor

Basic Information

Core positioning: The AKM series is a brushless DC synchronous servo motor that uses neodymium iron boron permanent magnet rotors and three-phase stator windings. It is equipped with a hollow shaft rotary transformer feedback as standard, and can be configured with a brake, EnDat encoder, shaft sealing ring, etc. It needs to be combined with a SERVOSTAR servo amplifier to form a closed-loop control system, and direct connection to the mains power is prohibited for operation.

Supporting resources: Should be used in conjunction with SERVOSTAR servo amplifier installation manual, operating software manual, and accessory manual; The original factory provides pre assembled motor power cables (such as 4 × 1mm ² shielded wire) and rotary transformer cables (4 × 2 × 0.25mm ² twisted pair). When selecting, the cable specifications should be matched according to the motor model.

Core technical characteristics and classification of motors

（1） General Technical Parameters

Category parameter item specification

Environmental adaptability to climate category EN 50178 3K3

Operating temperature -5~+40 ℃ (altitude ≤ 1000m), a 6% derating is required for every altitude exceeding 1000m (or a 10K temperature drop offsets the derating)

Protection level: IP65 for the casing, default IP40 for the shaft sleeve (IP65 with shaft sealing ring)

Humidity 95% relative humidity (no condensation)

Electrical characteristics - Insulation class DIN 57530 F

Vibration level DIN ISO 2373 N level

Thermal protection built-in PTC thermistor (155 ℃± 5% action, room temperature resistance ≤ 550 Ω, after action ≥ 1330 Ω)

Mechanical characteristics: Bearing life ≥ 20000 hours (rated condition)

Installation form standard IM B5 (flange installation), supporting orientations such as V1/V3

Shaft end specification: cylindrical shaft (AKM1 with h7 tolerance, others with k6 tolerance), with locking thread, optional keyway (DIN 748)

（2） Model classification and key parameters

The AKM series is divided into 7 models based on flange size and output torque, with the following differences in core parameters:

Model flange size (mm) Static torque range (Nm) Rated speed range (min ⁻¹) Rotor moment of inertia (kg · cm ²) Weight (kg)

AKM1 40 0.18~0.41 2000~8000 0.017~0.045 0.35~0.63

AKM2 58 0.48~1.42 1000~8000 0.11~0.27 0.82~1.66

AKM3 70 1.15~2.88 750~7000 0.33~0.85 1.55~2.9

AKM4 84 1.95~6.00 1000~6000 0.81~2.7 2.44~5.3

AKM5 108 4.70~14.4 1000~6000 3.4~12 4.2~9.0

AKM6 138 11.9~25.0 1000~6000 17~40 8.9~15.4

AKM7 188 29.4~53.0 1200~3500 65~120 19.7~33.6

（3） Optional configuration

Brake: 24V DC spring compression, braking when power is off, only used for parking braking (frequent operation braking is prohibited). The holding torque of the brake varies for different models (such as AKM2 at 1.42Nm and AKM7 at 53Nm), with a release delay of 20-110ms. When applied, external current components (such as varistors) are required.

Feedback device: Standard 2-pole hollow shaft rotary transformer, optional single/multi turn EnDat encoder (AKM2-4 uses ECN1113/EQN1125, AKM5-7 uses ECN1313/EQN1325) or incremental encoder with commutation signal (Comencoder), the encoder will increase the motor length and cannot be retrofitted.

Shaft sealing ring: anti oil mist/splash, raising the protection level of the shaft sleeve to IP65, not suitable for dry operation scenarios, additional order required.

Keyway: Process the shaft end keyway according to DIN 748, with short keys, and the shaft balance should include the weight of the keys. When selecting, pay attention to the radial force variation (the radial force limit remains unchanged with keyway).

Installation and wiring specifications

（1） Mechanical installation requirements

Installation preparation

Installation surface: It should be made of conductive material (such as aluminum alloy), with a flatness error of ≤ 0.1mm. AKM1/2 should reserve ≥ 50mm of heat dissipation space. AKM3 and above should be matched with designated cold plates (such as AKM3 requiring 350 × 350 × 10mm aluminum plates), and pasted with original thermal conductive film (model 849-373000-04 for small models).

Load limitation: The radial force (FR) allowed at the shaft end is negatively correlated with the rotational speed, for example, at 5000 min ⁻¹, FR=145N for AKM2, and the axial force (FA) ≤ FR/3; The formula for the minimum pulley diameter must be met during belt transmission

D min ≥ M 0/(F R × 2) (M 0 is the static torque) to avoid bearing overload.

Coupling selection: It is recommended to use friction couplings without backlash (such as Baumann&Cie, KTR brand), with a coaxiality error of ≤ 0.1mm. It is prohibited to use rigid couplings with external bearings for constrained installation to prevent excessive stress on the shaft system.

Installation steps

Clean the installation surface, stick the thermal conductive film (if necessary), and use M5 hex screws (torque 0.7~0.8Nm) to fix the motor, ensuring that the flange fits snugly without any gaps.

Install the coupler/pulley and tighten it with the shaft end locking thread. Do not strike the shaft end (to avoid bearing damage). The AKM1 shaft tolerance is h7, and attention should be paid to the fit clearance.