---
title: Is There an Option Between Stepper Motors and Servo Motors?
description: Servo motor systems are expensive but great for demanding applications that require high speed, peak torque, or feedback.  Stepper motors are cost-effective but do not offer the peace of mind of feedback.  For designs that do not need the bells and whistles of servo motor systems, there is a middle ground.
image: https://www.orientalmotor.com/images/stepper-motors/alphastep-rated-output.jpg
---

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Engineering Notes

## Engineering Notes by Oriental Motor

# [Is There an Option Between Stepper Motors and Servo Motors?](https://blog.orientalmotor.com/is-there-an-option-between-stepper-motors-and-servo-motors)

 \[fa icon="calendar"\] Originally posted on Aug 1, 2022, 5:45:00 PM   
Last updated on January 17, 2024 / by [Johann Tang](https://blog.orientalmotor.com/author/johann-tang)

![Johann Tang](https://app.hubspot.com/settings/avatar/8cc777610596a2b2230de2963e906c0b)

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Servo motor systems are expensive but great for demanding applications that require high speed, peak torque, or feedback.  Stepper motors are cost-effective but do not offer the peace of mind of feedback.  For designs that do not need the bells and whistles of servo motor systems, there is another option.

 

![AlphaStep AZ Series](https://www.orientalmotor.com/images/stepper-motors/az-series-absolute-sensor-350px.jpg)

 

Oriental Motor's AlphaStep AZ Series family of motors, actuators, and smart drivers offers a way to combine the best of open-loop and closed-loop performance for various motion control applications.

 

 

👍 Closed-Loop Feedback

An *(ABZO) magnetoresistive mechanical absolute sensor technology* is utilized as feedback for the AZ Series stepper motors, which can retain up to 1,800 revolutions of absolute position data for reliable positioning and faster homing speeds.  Unlike servo motors with absolute optical encoders, a separate power supply or backup battery is not necessary to maintain position tracking.  

To ensure reliability, AlphaStep systems utilize a patented *Hybrid Control* algorithm where the motor operates in open-loop normally but switches into closed-loop for self-correction once the system detects an abnormality, such as overload or overspeed.  This ensures the best performance for normal and overload conditions.  

 

| ![Open Loop Control](https://www.orientalmotor.com/images/stepper-motors/alphastep-open-loop-operation.jpg) | ![Closed Loop Control](https://www.orientalmotor.com/images/stepper-motors/alphastep-closed-loop-operation.jpg) |
| --- | --- |

 

👍 High Speed Performance

The motor is wound in bipolar-parallel for the best high speed performance from a stepper motor.  AlphaStep's *Keep-In-Step* technology optimizes the timing of motor phase switching to enhance the performance further.  The "*Smooth Drive*" technology removes excessive vibration and noise, and a "*servo emulation*" mode enables efficient current control. 

 

Here we compare the speed torque curve of an AlphaStep AZ Series stepper motor to a servo motor.  

![AlphaStep AZ Series vs servo motor](https://www.orientalmotor.com/images/stepper-motors/alphastep-rated-output.jpg)

 

Here's a performance comparison between an AlphaStep AZ Series stepper motor and a servo motor on a rotary index table.  The AZ Series stepper motor can position quicker for shorter distances while servo motors can position quicker when the travel distance is more than 4 revolutions.

 

![Stepper vs servo: rotary index table](https://blog.orientalmotor.com/hubfs/image-png-May-03-2023-10-47-02-9938-PM.png)

 

Servo motors can typically handle a higher inertial load than closed-loop stepper motors.  However, the gain setting may cause the motor to have a slower response when handling high loads.  This is why the AlphaStep AZ Series stepper motor is able to position a load with high inertia ratio in a shorter amount of time.  With a smaller inertia ratio, servo motors will be faster.

 

👍Stop Accuracy

Stop accuracy is more consistent than a servo motor with a 20-bit encoder.  The high pole count helps.

 

![AlphaStep Stopping Accuracy](https://www.orientalmotor.com/images/stepper-motors/alphastep-stopping-accuracy.jpg)

 

👍 Efficiency

The AlphaStep AZ Series also uses our *patented low-loss lamination technology* to minimize loss.

| Lower Operating Temperature Motor surface temperature is also reduced, which expands the application range of the AZ Series. Continuous Duty is Possible As losses are minimized, the heat generated from the motor is reduced.  Lower Power Consumption Power consumption is reduced by 47% when compared to older conventional models. | ![Alphastep - Lower heat generation](https://www.orientalmotor.com/images/stepper-motors/stepper-motors-az-thermography.jpg) |
| --- | --- |
| ![AlphaStep stepper motor surface temperature](https://www.orientalmotor.com/images/stepper-motors/stepper-motors-az-motor-temperature.jpg) | ![Alphastep stepper motor power consumption](https://www.orientalmotor.com/images/stepper-motors/stepper-motors-az-power-consumption.jpg) |

 

👍 Network Support

Another advantage that servo motor systems can offer is the inclusion of popular industrial communication protocols to connect to various PLCs, HMIs, IPCs, and other host controllers.  However, stepper motors now offer the same connectivity options.  Many types of AlphaStep AZ Series drivers are available with *Modbus (RTU), EtherNet/IP, EtherCAT, Profinet, CC-Link, Mechatrolink,* and *SSCNETIII/H*.

![AZ Series driver types](https://www.orientalmotor.com/images/stepper-motors/az-series-driver-options.jpg)

 

👍 Easy, Powerful Programming

An easy-to-use data setting software is available to program motion sequences and link up to 256 different motion profiles with fully customizable parameters, such as operating current, push motion, or loops.  The *MEXE02 support software* for the AZ Series provides many useful functions to enhance its capabilities and is the most powerful software we've released up to date.  Advanced functions, such as wrap proximity positioning, operation I/O event, and data direct operation (network type) are available to support decentralized control.

 

![MEXE02 Software](https://www.orientalmotor.com/images/stepper-motors/closed-loop-driver-az-mexe02.jpg)

| Data - Operation data - Operation I/O event - Extended operation data set Parameter - Base settings - Motor & mechanism - ETO & alarm & info - I/O action and function - Direct-IN function - Direct-OUT function - Remote-I/O function - Communication | Monitor - Teaching, remote operation - Unit information monitor - Status monitor - Direct I/O, remote I/O monitor - Internal I/O monitor - Alarm monitor - Information monitor - RS-485 communication monitor - Waveform monitor - I/O test |
| --- | --- |

 

*With efficient low-loss technology, innovative absolute position control, reliable hybrid control technology, and a variety of motors, actuators, smart drivers, and network options, the AlphaStep AZ Series presents a flexible closed-loop motion system that closes the gap between stepper motors and servo motors.* 

*For the right application, the AlphaStep AZ Series can help reduce cost and complexity while offering many features and functions that servo motor systems offer.*

 

| **Demo: 7-Axis Articulated Robot Arm** |
| --- |
| <iframe data-hsv-src="https://play-na2.hubspotvideo.com/v/2284573/id/43879918442" referrerpolicy="origin" sandbox="allow-forms allow-scripts allow-same-origin allow-popups" allow="autoplay; fullscreen;" style="position: absolute !important; width: 100% !important; height: 100% !important; left: 0; top: 0; border: 0 none; pointer-events: initial" title="HubSpot Video" loading="lazy" data-hsv-id="43879918442" data-hsv-style="" data-hsv-width="854" data-hsv-height="479" data-hsv-autoplay="false" data-hsv-loop="false" data-hsv-muted="false" data-hsv-hidden-controls="false" data-hsv-full-width="false"></iframe> |
| ![Motor components for 7-axis robotic arm](https://blog.orientalmotor.com/hs-fs/hubfs/Motor%20list.jpg?width=699&name=Motor%20list.jpg)   The video also shows a new "mini" driver that can help reduce footprint and weight.   ![Compact Design](https://www.orientalmotor.com/images/stepper-motors/az-mini-driver-dimensions.jpg) |
|  |

There are two ways to operate multiple axes of AlphaStep family products.

| **Multiple Single-Axis "mini" Drivers** | **One Multi-Axis Driver** |
| --- | --- |
| ![Network Compatible](https://www.orientalmotor.com/images/stepper-motors/az-mini-driver-fa-network.jpg) | ![multi-axis controller / driver](https://www.orientalmotor.com/images/stepper-motors/azd-multi-axis-drivers.jpg) |

[![Meet the αSTEP AZ Series Family](https://hubspot-no-cache-na2-prod.s3.amazonaws.com/cta/default/2284573/4c361ccd-45b7-4a05-ae1c-ea16a49b5059.png)](https://hubspot-cta-redirect-na2-prod.s3.amazonaws.com/cta/redirect/2284573/4c361ccd-45b7-4a05-ae1c-ea16a49b5059)

 

Our team is standing by to answer any questions you may have.

| [![Contact Us](https://hubspot-no-cache-na2-prod.s3.amazonaws.com/cta/default/2284573/e64b3511-e058-4331-988a-7b02387c7450.png)](https://hubspot-cta-redirect-na2-prod.s3.amazonaws.com/cta/redirect/2284573/e64b3511-e058-4331-988a-7b02387c7450) | [![Schedule a Demo  ](https://hubspot-no-cache-na2-prod.s3.amazonaws.com/cta/default/2284573/1e7b1d02-89a3-44b1-8bcf-5d33d24a7a34.png)](https://hubspot-cta-redirect-na2-prod.s3.amazonaws.com/cta/redirect/2284573/1e7b1d02-89a3-44b1-8bcf-5d33d24a7a34) |
| --- | --- |

 

Interested in speed control?  Our [![brushless motors](https://hubspot-no-cache-na2-prod.s3.amazonaws.com/cta/default/2284573/5efb7e49-11af-47a9-8a74-3106cbd4e90a.png)](https://hubspot-cta-redirect-na2-prod.s3.amazonaws.com/cta/redirect/2284573/5efb7e49-11af-47a9-8a74-3106cbd4e90a) can also replace servo motors in some applications.

 

 Topics: [Stepper Motors](https://blog.orientalmotor.com/topic/stepper-motors), [Robotics](https://blog.orientalmotor.com/topic/robotics), [Absolute Positioning](https://blog.orientalmotor.com/topic/absolute-positioning), [Alphastep Hybrid Control](https://blog.orientalmotor.com/topic/alphastep-hybrid-control), [Linear Actuators](https://blog.orientalmotor.com/topic/linear-actuators), [Servo Motors](https://blog.orientalmotor.com/topic/servo-motors), [Network](https://blog.orientalmotor.com/topic/network)

![Johann Tang](https://app.hubspot.com/settings/avatar/8cc777610596a2b2230de2963e906c0b)

#### Written by [Johann Tang](https://blog.orientalmotor.com/author/johann-tang)

Johann Tang is a Product Specialist at Oriental Motor USA Corp. Before joining the marketing team, he spent 14 years in sales and technical application support, and he also led product training on various types of fractional-horsepower electric motors, gear motors, actuators, drivers, and controllers. If you have any questions, please feel free to use the live chat window, 1-800-GO-VEXTA (1-800-468-3982), or techsupport@orientalmotor.com, to reach our product support team. Sorry, comments have been turned off.

[\[fa icon="linkedin-square"\]Linkedin](https://www.linkedin.com/in/johanntang/)

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