AC servo motor
Kinco SMH Series AC Servo Motors (SMH40S-SMH180D)
Kinco's established AC servo motor range from 40 to 180 mm frames, covering 50 W to 7.5 kW and up to 48 Nm rated torque. Standard feedback is a 2500-line incremental encoder with Hall commutation, with absolute options and a resolver on the 180 mm frame. Pairs with FD2S and CD2S drives.
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What are you specifying?
Select everything you need. A motor, drive and gearbox can be specified together as one axis.
Key specifications
| Rated torque | 0.16–48 Nm |
|---|---|
| Rated speed | 1500 / 2000 / 3000 (model dependent) |
| Power | 50–7,500 W |
| Frame sizes | 40, 60, 80, 110, 130, 150, 180 mm |
| Supply | DC link 300 V or 560 V (220/380 VAC drives) |
| Feedback | 2500-line incremental encoder with Hall, Absolute encoder (option), Resolver (SMH180 option) |
| Rated current | 0.7-19.2 |
Series ranges as published; individual models vary. The full datasheet, drawings and CAD models are available on request.
Kinco SMH Series AC Servo Motors (SMH40S-SMH180D) 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 | SMH Series AC Servo Motors (SMH40S-SMH180D) | ELM1 / ELM2 AC Servo Motors |
|---|---|---|
| Rated torque | 48 Nm | — |
| 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
- Holding brake ("B" in model code)
- Aviation plugs (HFO18/HFO21, 2xM17)
- 15-pin encoder plug
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 SMH Series AC Servo Motors (SMH40S-SMH180D)
Send these with your enquiry and an engineer can confirm the right SMH Series AC Servo Motors (SMH40S-SMH180D) 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 SMH Series AC Servo Motors (SMH40S-SMH180D): frequently asked questions
Can you help replace Kinco SMH Series AC Servo Motors (SMH40S-SMH180D) 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 SMH Series AC Servo Motors (SMH40S-SMH180D)?
Kinco's established AC servo motor range from 40 to 180 mm frames, covering 50 W to 7.5 kW and up to 48 Nm rated torque. Standard feedback is a 2500-line incremental encoder with Hall commutation, with absolute options and a resolver on the 180 mm frame. Pairs with FD2S and CD2S drives. Published series figures include rated torque 0.16 Nm, rated torque 48 Nm, power 50 W, power 7,500 W. It is available through our supply network, and our engineers can confirm the right variant for your application.
Who makes the Kinco SMH Series AC Servo Motors (SMH40S-SMH180D)?
The Kinco SMH Series AC Servo Motors (SMH40S-SMH180D) 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 SMH Series AC Servo Motors (SMH40S-SMH180D)?
The published series minimum rated torque is 0.16 Nm. Individual models and sizes in the SMH Series AC Servo Motors (SMH40S-SMH180D) 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 SMH Series AC Servo Motors (SMH40S-SMH180D)?
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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