AC servo drive
Yaskawa Sigma-7 SERVOPACKs (SGD7S / SGD7W) AC servo drive
Single- and dual-axis Sigma-7 servo amplifiers with 3.1 kHz speed-loop bandwidth and a choice of MECHATROLINK-III, EtherCAT and PROFINET.
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Pricing and availability
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Need Yaskawa parts, a replacement or a suitable alternative? Send us a part number, or tell us what the machine needs to do. Our UK engineers will come back with the right product, pricing, lead time and delivery, whether that is the original part, a checked alternative or a complete axis.
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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
| Power (max) | 15,000 W |
|---|---|
| Supply | 3-phase 400 Vac (200 V versions also offered) |
| Fieldbus | MECHATROLINK-III, EtherCAT, PROFINET, Sigma-7Siec integrated controller |
| Axes | 2 |
Summarised in our own words from Yaskawa Electric Corporation's published data; series maxima, individual models vary. Last checked 2026-10-29. Source 1
Notes on this data
SGD7S 0.5-15 kW (400 V); SGD7W 2 x 0.75 kW and 2 x 1.5 kW. Output currents not extracted. Speed-loop bandwidth 3.1 kHz.
Specify Motion is not affiliated with Yaskawa Electric Corporation. Yaskawa and Sigma-7 SERVOPACKs (SGD7S / SGD7W) are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Yaskawa Sigma-7 SERVOPACKs (SGD7S / SGD7W) replacement and alternative options
Use these supply-network options as a starting point for an engineering check. We can also help source the original Yaskawa part. Published series figures do not establish an exact-model or drop-in replacement: confirm ratings, fit, interfaces and approvals for your application.
Network-capable AMC digital drives spanning 10-747 VDC and 120-480 VAC, up to 150 A continuous and 250 A peak (27.4 kW peak power), in PCB, panel, machine and vehicle formats. They support almost any motor type and feedback, plus CANopen, EtherCAT, POWERLINK and Modbus.
| Published maximum | Sigma-7 SERVOPACKs (SGD7S / SGD7W) | DigiFlex Performance Servo Drives (DP,… |
|---|---|---|
| Continuous current | — | 150 A |
| Peak current | — | 250 A |
| Power | 15,000 W | 27,400 W meets or exceeds |
| Axes | 2 | — |
A dual-axis low-voltage Kinco drive for AGV differential-drive wheels, with RS + CANopen or RS + pulse variants and built-in brake output.
| Published maximum | Sigma-7 SERVOPACKs (SGD7S / SGD7W) | FDS Two-in-One Low-Voltage DC Servo Dr… |
|---|---|---|
| Power | 15,000 W | — |
| Axes | 2 | 2 meets or exceeds |
Dual-axis closed-loop EtherCAT stepper drive, open/closed loop selectable, optional STO.
| Published maximum | Sigma-7 SERVOPACKs (SGD7S / SGD7W) | Leadshine 2CS3E Series |
|---|---|---|
| Continuous current | — | 7 A |
| Power | 15,000 W | — |
| Axes | 2 | 2 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.
Typical applications
What an AC servo drive is
An AC servo drive, or servo amplifier, powers and controls a servo motor from mains supply. It rectifies the AC input to a DC bus, then uses an inverter of power transistors switched by PWM to produce controlled three-phase current in the motor. Nested current, velocity and position loops use encoder feedback to follow commands from pulse and direction, analogue or industrial Ethernet. Modern drives add auto-tuning, vibration suppression and safety functions such as safe torque off.
When engineers choose an AC servo drive
Choose an AC servo drive for mains-powered machines with servo axes from tens of watts to many kilowatts, such as packaging, machine tools and robotics. It gives precise, dynamic control with standard industrial interfaces. The trade-offs are cabinet space, wiring, EMC measures and the need to match motor and feedback. For low-voltage or mobile machines, a DC drive is more suitable; for many axes in one cabinet, a multi-axis drive may save space.
How to specify the Yaskawa Sigma-7 SERVOPACKs (SGD7S / SGD7W)
Send these with your enquiry and an engineer can confirm the right Sigma-7 SERVOPACKs (SGD7S / SGD7W) variant or an equivalent:
- Supply voltage and phases (V AC)
- Continuous and peak output current (A rms)
- Motor and feedback compatibility
- Command interface: pulse, analogue, EtherCAT, PROFINET and so on
- Safety functions, such as STO, and their rating (SIL, PL)
- Braking resistor and regenerative energy (W, J)
- Ambient temperature, mounting and cooling
Common mistakes to avoid
- Sizing on motor rated current without the drive's peak duration
- Ignoring regenerative energy on fast decelerations or vertical axes
- Leaving out EMC filtering and screened motor cables
- Mixing motor and encoder types the drive does not support
Yaskawa Sigma-7 SERVOPACKs (SGD7S / SGD7W): frequently asked questions
Can you help replace Yaskawa Sigma-7 SERVOPACKs (SGD7S / SGD7W) 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 Yaskawa Sigma-7 SERVOPACKs (SGD7S / SGD7W)?
Single- and dual-axis Sigma-7 servo amplifiers with 3.1 kHz speed-loop bandwidth and a choice of MECHATROLINK-III, EtherCAT and PROFINET. Published series figures include power 15,000 W, axes 2. It is made by Yaskawa Electric Corporation; Specify Motion can help source it or propose an equivalent.
Who makes the Yaskawa Sigma-7 SERVOPACKs (SGD7S / SGD7W)?
The Yaskawa Sigma-7 SERVOPACKs (SGD7S / SGD7W) is made by Yaskawa (Yaskawa Electric Corporation) and is listed here for engineers comparing options. Specify Motion is not affiliated with Yaskawa Electric Corporation; brand names are used only to identify the product.
What is the power of the Yaskawa Sigma-7 SERVOPACKs (SGD7S / SGD7W)?
The published series maximum power is 15,000 W. Individual models and sizes in the Sigma-7 SERVOPACKs (SGD7S / SGD7W) 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 Yaskawa Sigma-7 SERVOPACKs (SGD7S / SGD7W)?
We can assess suitable replacement options. On published figures, ADVANCED Motion Controls DigiFlex Performance Servo Drives (DP, DZ, DV) and Kinco FDS Two-in-One Low-Voltage DC Servo Drive (FDS-AB/CB/LB-D) are options to assess from our supply network. An engineer confirms the fit against your application before recommending anything.
Does a servo drive need a braking resistor?
When a servo motor decelerates, it acts as a generator and returns energy to the drive's DC bus. If the bus capacitors cannot absorb it, the voltage rises and the drive trips. A braking resistor dissipates the energy as heat. Fast decelerations, high inertia and vertical axes usually need one.
What is safe torque off on a servo drive?
Safe torque off, or STO, is a safety function that removes power that could produce torque at the motor, without disconnecting the drive supply. It is defined in IEC 61800-5-2 and used as part of a machine's safety system. Check the safety level achieved and wiring requirements.
Further reading: How to select a servo drive · How to select a servo motor · Servo drives
Other ac servo drive series
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Tell us how you use the Yaskawa Sigma-7 SERVOPACKs (SGD7S / SGD7W): the load, speed, duty and environment. Our engineers will confirm whether it is still the right part, find it for you, or propose an alternative that fits better.
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How it works
From enquiry to delivery
Send a part number or describe the application. Our engineers take it from there: the right product, a clear quotation, and delivery and support arranged.
- 01Tell us what you needSend a part number, or configure the application, quantities and timing.
- 02An engineer reviews itWe check the specification and find the original part, a checked equivalent or a complete axis.
- 03Receive your quotationProducts, pricing, lead time and compatibility notes in one reply.
- 04Order and deliveryWhen you are happy, the order is placed and delivery and after-sales support are arranged.