AC servo motor
Kinco SMK Series AC Servo Motors (SMK40S/60S/80S, SMK130G, SMK180G)
Kinco's current-generation AC servo motor line, matched to the JD2 and FD5P PRO drives. Small-inertia 40-80 mm frames run at 3000 rpm on 220 V; large-inertia 130 and 180 mm frames are 1500 rpm machines reaching 47.8 Nm rated and 7.5 kW, with 23-bit multi-turn absolute encoders as standard.
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Pricing and availability
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Configure Kinco SMK Series AC Servo Motors (SMK40S/60S/80S, SMK130G, SMK180G)
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- 1Products
- 2Performance
- 3Environment
- 4Volumes
- 5Your spec
What are you specifying?
Select everything you need. A motor, drive and gearbox can be specified together as one axis.
Key specifications
| Ingress protection | IP67 body (small inertia) / IP65 body (large inertia per FD5P catalogue); IP54 shaft with oil seal, IP50 without |
|---|---|
| Rated torque | 0.16–47.8 Nm |
| Peak torque (max) | 119.5 Nm |
| Speed (max) | 6,000 rpm |
| Rated speed | 1500 (130G/180G) or 3000 (40-80 mm) |
| Power | 50–7,500 W |
| Frame sizes | 40, 60, 80, 130, 180 mm |
| Supply | 220 VAC (40-130 mm); 380 VAC (180 mm) |
| Feedback | 23-bit multi-turn optical absolute (Y), 17-bit multi-turn magnetic absolute (Q) |
| Inertia | Small (S) 0.023-1.027 kg.cm2; Large (G) 11.56-140 kg.cm2 |
| Rated current | 0.88-25 |
| Brake holding | 0.32 (40) / 2 (60) / 4 (80) / 20 (130) / 55 (180), 24 VDC |
Series ranges as published; individual models vary. The full datasheet, drawings and CAD models are available on request.
Kinco SMK Series AC Servo Motors (SMK40S/60S/80S, SMK130G, SMK180G) replacement and alternative options
Use these supply-network options as a starting point for an engineering check. We can also help source the original Kinco part. Published series figures do not establish an exact-model or drop-in replacement: confirm ratings, fit, interfaces and approvals for your application.
Leadshine's AC servo motors for the EL8/EL7/EL6 drives: ELM1 is the economy line and ELM2 the general-purpose line, both with 23-bit absolute encoders, IP65/IP67 sealing and up to 3.5x overload. The catalogue extends ELM2M to 22 kW and previews a 26-bit ELM3.
| Published maximum | SMK Series AC Servo Motors (SMK40S/60S/80S, SMK130G, SMK180G) | ELM1 / ELM2 AC Servo Motors |
|---|---|---|
| Rated torque | 47.8 Nm | — |
| Peak torque | 119.5 Nm | — |
| Speed | 6,000 rpm | — |
| Power | 7,500 W | 7,500 W meets or exceeds |
Figures are the highest published for each series and are not always measured the same way. A higher figure is not automatically a better choice: mounting, duty cycle, feedback, connectors and approvals matter too. An engineer will check the fit against your application before recommending anything.
Options
- 24 VDC holding brake (A = none, B = brake)
- Oil seal
- Small or large inertia
- 17-bit magnetic or 23-bit optical multi-turn absolute encoder
- Insulation class F
Typical applications
What an AC servo motor is
An AC servo motor is a permanent-magnet synchronous motor designed for closed-loop control of position, speed and torque. A wound stator is driven by a servo drive with sinusoidal three-phase current, while magnets on the rotor follow the rotating field. A high-resolution encoder or resolver on the shaft feeds position back to the drive, which adjusts current many thousands of times a second. The result is precise, dynamic motion with high peak torque, typically about three times the continuous rating for short periods.
When engineers choose an AC servo motor
Choose an AC servo for machine axes needing fast, accurate motion under varying loads, such as packaging, robotics, machine tools and printing. Compared with steppers, servos keep torque at high speed and cannot silently lose position. The trade-offs are cost and set-up: a servo needs a matched drive, feedback and tuning. For simple, low-speed indexing with a steady load, a stepper may be cheaper. For very low speeds and high torque, a gearbox or direct-drive motor may be needed.
How to specify the Kinco SMK Series AC Servo Motors (SMK40S/60S/80S, SMK130G, SMK180G)
Send these with your enquiry and an engineer can confirm the right SMK Series AC Servo Motors (SMK40S/60S/80S, SMK130G, SMK180G) variant:
- Continuous and peak torque (Nm)
- Rated and maximum speed (rpm)
- Load inertia and inertia ratio
- Supply voltage: 230 V single-phase or 400 V three-phase
- Feedback: incremental or absolute encoder, resolution (bits)
- Holding brake, IP code and shaft options
- Flange size and mounting (mm)
Common mistakes to avoid
- Sizing on peak torque without checking RMS torque over the cycle
- Ignoring load-to-motor inertia ratio, which makes tuning hard
- Forgetting the brake is for holding, not dynamic stopping
- Using a motor and drive pair that the supplier has not matched
Kinco SMK Series AC Servo Motors (SMK40S/60S/80S, SMK130G, SMK180G): frequently asked questions
Can you help replace Kinco SMK Series AC Servo Motors (SMK40S/60S/80S, SMK130G, SMK180G) or source the original?
Send the full model code, quantity and required date. Our engineers can check original-part availability and assess suitable alternatives, including supply-network options where appropriate. We confirm compatibility and any changes needed before recommending a replacement.
What is the Kinco SMK Series AC Servo Motors (SMK40S/60S/80S, SMK130G, SMK180G)?
Kinco's current-generation AC servo motor line, matched to the JD2 and FD5P PRO drives. Small-inertia 40-80 mm frames run at 3000 rpm on 220 V; large-inertia 130 and 180 mm frames are 1500 rpm machines reaching 47.8 Nm rated and 7.5 kW, with 23-bit multi-turn absolute encoders as standard. Published series figures include rated torque 0.16 Nm, rated torque 47.8 Nm, peak torque 119.5 Nm, speed 6,000 rpm. It is available through our supply network, and our engineers can confirm the right variant for your application.
Who makes the Kinco SMK Series AC Servo Motors (SMK40S/60S/80S, SMK130G, SMK180G)?
The Kinco SMK Series AC Servo Motors (SMK40S/60S/80S, SMK130G, SMK180G) is made by Kinco (Kinco Automation) available through our supply network. Send us your requirement for pricing, lead time, datasheets and CAD.
What is the rated torque of the Kinco SMK Series AC Servo Motors (SMK40S/60S/80S, SMK130G, SMK180G)?
The published series minimum rated torque is 0.16 Nm. Individual models and sizes in the SMK Series AC Servo Motors (SMK40S/60S/80S, SMK130G, SMK180G) range vary, so check the exact variant against your duty cycle, mounting and environment, or ask our engineers to confirm the right size for you.
Is there an alternative to the Kinco SMK Series AC Servo Motors (SMK40S/60S/80S, SMK130G, SMK180G)?
We can assess suitable replacement options. On published figures, Leadshine ELM1 / ELM2 AC Servo Motors is options to assess from our supply network. An engineer confirms the fit against your application before recommending anything.
What is the inertia ratio in servo sizing?
The inertia ratio compares the load inertia reflected to the motor shaft with the motor's rotor inertia. High ratios make the axis harder to tune and slower to settle. Many engineers aim for below about 10:1, and lower for highly dynamic axes, using a gearbox to reduce reflected inertia where needed.
Do AC servo motors need an absolute encoder?
Not always. Incremental encoders need a homing routine after power-up, which is acceptable on many machines. Absolute encoders know their position at power-on, avoiding homing, which saves time and suits robots and multi-axis machines. Multi-turn absolute encoders track turns even when power is off.
Further reading: How to select a servo motor · Servo vs stepper · Servo and stepper motors
Often compared with
Engineers specifying this series often compare it with:
Other ac servo motor series
Engineer support
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From enquiry to delivery
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- 01Tell us what you needSend a part number, or configure the application, quantities and timing.
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