Integrated Closed-Loop-Stepperdrives from Just Motion Control

For small to medium-heavy lathes and milling machines, we offer this closed-loop stepper motor system with 2-phase hybrid stepper motors with encoder and an integrated driver that can be operated with 20-50V voltage. These drives deliver strong torques from 1 to 10 Nm, making them suitable for a wide range of positioning applications, such as in lathes, milling machines, robots, placement machines, winding machines and many more.

This is an integrated system with MOTOR, ENCODER and DRIVER in one unit.

These closed loop drives have the special feature that the position of the motor shaft is measured by an encoder and reported back to the motor driver. The driver can thus check whether the motor has executed the desired movement and adjusts during the movement. This avoids step losses and provides a high level of safety. Further advantages are a higher torque and speed and the possibility to accelerate faster.

We supply only original goods from JMC, ex stock Germany
USB - RS232 converter HL-340
Converter from USB to RS232
6,90 EUR
incl. 19% tax excl. Shipping costs
1 to 12 (from a total of 12)

System description

The motors of this system are 2-phase hybrid stepper motors which have an encoder with 1000 steps at the rear shaft end. The control is done by a driver, which is optimized for these 2-phase motors and is mounted directly on the motor. Cables for power supply and control signals must therefore be included for connection. The motors have built-in 1000-dash axis encoders that report the position to the driver. This enables the driver to operate the motor in a closed control loop, hence the name "closed-loop stepper motor".  
The systems are ready for operation immediately after connection, no tuning is necessary. 

These closed-loop drives have the special feature that the position of the motor shaft is measured by an encoder and reported back to the motor driver. The driver can check whether the motor has executed the desired movement and adjusts during the movement. This avoids step losses and provides a high level of safety. Further advantages are a higher torque and speed and the possibility to accelerate faster.

System components of the integrated motors

The motor system is integrated, motor, driver and encoder form one unit.
An RS-232 interface allows communication with a PC software from JMC, thus many parameters of the drive can be set.

What motor variants do we offer?

Motortyp Voltage(V) Current
Size RS232 Encoder
iHSS57-36-10-21-38 20-50 V 4 A 1,0 NEMA23 ja ja
iHSS57-36-20-21-38 20-50 V 5A 2,0 NEMA23 ja ja
iHSS60-​36-30-21-38 20-50 V 5A 3,0 NEMA24 ja ja
iHSS86-​60-45 24-80 V 6A 4,5 NEMA34 ja ja
iHSS86-​80-100 24-100 V 6A 9,5 NEMA34 ja ja

Torque values of the motors:








Advantages of closed-loop drives 

What are closed-loop stepper motors?

Closed-loop stepper motors combine the advantages of stepper and servo motor technology. They are smoother running and have lower resonance than stepper motors, offer position feedback and control, short settling and decay times, and no longer exhibit step loss.

They are an alternative to stepper motors when energy efficiency, smooth running and high load tolerance are required. Compared to servo motors, they have advantages in terms of high torque at low speeds, short settling times, correct positioning without hunting, and a lower price with often smaller size.

When are closed-loop stepper motors the optimal alternative?

  • When high torque is required at speeds up to 1000 rpm and a compact, low-cost solution is needed that does not require a gearbox.
  • When simple and fast commissioning without complex tuning is required.
  • When a low-cost drive is required as an alternative to servo motors.
  • When a load must be held in position at standstill (e.g. Z-axis of a milling machine).
  • When the typical hunting behavior of servo motors leads to tracking errors that are intolerable for the application. Servo motors overrun their position in the event of sudden load changes and must then be corrected.

Frequently asked Questions about the shop

 Can I order as a guest?

Yes! You do not need a customer account.
You can order as a guest without creating an account, that is our default. Only if you want you can also create an account.
You can also pay in the shopping cart directly with Paypal or Amazon, then you do not have to enter any data at all.

Alternatively, you can also simply log in with your Amazon account. However, we do not receive your Amazon access data but only your address for shipping in case of order. The data is entered on an Amazon page, which is only displayed here in the store. The entries are processed 100% by Amazon via an encrypted connection.

 How can I pay?

We offer a wide range of payment methods:

  • Paypal
  • Prepayment
  • Bank transfer
  • Credit cards (Visa, Mastercard, Amex, CartaSi, CarteBleu, Maestro)
  • Amazon Pay
  • Apple Pay
  • eps for Austria.
  • iDEAL in the Netherlands
  • Przelewy24 in Poland
  • Belfius and KBC in Belgium

All payments are processed by secure reputable service providers, your payment details are securely SSL encrypted.

 Can I buy on account?

No, currently that is only possible in Germany.

 Is there a minimum order value?

No, there is no minimum order value, we also ship smallest parts directly. 

 How much are the shipping costs?

The shipping costs are calculated by weight.
If you put your desired goods in the shopping cart, you will see there the shipping costs for your order. If desired, you can also change the delivery country there.

 Can I also return items?

We grant 30 days return policy on all items. Simply send the goods back to us if you are not satisfied, we will immediately credit the amount if the item was not used. We are also happy to help in advance to clarify any ambiguities, this is sometimes better than sending back immediately.


 Can I buy VAT free with EU VAT ID?

Yes, as a European customer you can also enter an EU VAT number in the customer data, then you will not be charged VAT, the prices will then be displayed tax-free. This does not apply to customers with delivery country Germany. All countries outside Europe are automatically delivered tax free.

 How can I reach you?

You can easily reach us by phone, whatsapp and email:

 Hotline: +49 (0)4281 50 79 78 2 (Mo-Fr. 14-18:00)

 Whatsapp: +49 (0)4281 50 79 78 2




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About Rocketronics

Rocketronics was founded in 1999 as a family business by Louis Schreyer. As an engineer for microelectronics, I design hardware and also develop the software for it. We manufacture our products in-house on our own machines, and this for over 20 years now - made in Germany. In addition to the development and production, the testing of the products is also carried out here. We also manufacture the prototype construction and the test fixtures ourselves. We use lathes and milling machines for this, but we also use our 3D printers a lot. The CNC milling machines we build ourselves produce many small parts, e.g. for the housings of our controllers.

In addition to manufacturing controllers, we also trade in the necessary components. As a dealer we have a large stock of components for machine building and automation, which we offer in this store. Our suppliers are the original manufacturers, with us you buy tested branded goods. 

We also consult you when it comes to choosing the right components. We have a lot of experience in building and operating CNC milling machines and lathes. We can help you if you have questions, be it about the control system, the choice of drives or in general about the construction of CNC milling machines and the conversion of lathes. 

Our online store shows you all items available for immediate delivery, and allows you to shop securely with many payment methods and fast shipping. Data traffic is of course encrypted, payment is processed and secured by reputable service providers, and we offer a 30-day return policy

You find more about Rocketronics on our About Us Page