AC servo motor
Leadshine ELM1 / ELM2 AC Servo Motors
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.
Key specifications
| Ingress protection | IP65 or IP67 |
|---|---|
| Speed (max) | 6000 (ELM1) / 6500 (ELM2) |
| Power | 50–7,500 W |
| Frame sizes | 40, 180 mm |
| Supply | 220 VAC / 380-400 VAC |
| Feedback | 23-bit multi-turn absolute, magnetic or optical, 23-bit battery-less absolute (ELM2) |
| Overload | up to 3.5x |
Series ranges as published; individual models vary. The full datasheet, drawings and CAD models are available on request.
Options
- Optional brake
- Oil seal on all series
- Direct or aviation connector
- ELM2M 11-22 kW (catalogue)
- ELM3 26-bit optical, 7000 rpm max (catalogue; status unclear)
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 Leadshine ELM1 / ELM2 AC Servo Motors
Send these with your enquiry and an engineer can confirm the right ELM1 / ELM2 AC Servo Motors 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
Leadshine ELM1 / ELM2 AC Servo Motors: frequently asked questions
What is the Leadshine ELM1 / ELM2 AC Servo Motors?
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 series figures include 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 Leadshine ELM1 / ELM2 AC Servo Motors?
The Leadshine ELM1 / ELM2 AC Servo Motors is made by Leadshine (Leadshine Technology) available through our supply network. Send us your requirement for pricing, lead time, datasheets and CAD.
What is the power of the Leadshine ELM1 / ELM2 AC Servo Motors?
The published series minimum power is 50 W. Individual models and sizes in the ELM1 / ELM2 AC Servo Motors 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.
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
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