Closed-Loop stepper motors and drivers from Leadshine and JMC

We have various closed loop drive systems in stock. Ideal for positioning tasks, CNC and general drive purposes.

A closed-loop stepper motor is a type of stepper motor that uses feedback to improve its accuracy and stability. Unlike an open-loop stepper motor, which relies solely on the drive signal to control the position of the motor shaft, a closed-loop stepper motor uses an encoder or other type of feedback device to monitor its actual position and make adjustments as needed. This allows the motor to operate more accurately and respond more quickly to changes in load or other external factors. The feedback information is used to close the loop and control the stepper motor position. This type of motor is commonly used in applications that require high precision and repeatability, such as precision positioning systems and robotics.

Equip your turning or milling machine with these closed-loop drives so that the axes can move faster without fear of step losses. Especially with short traverse paths the superiority becomes apparent, the high acceleration saves a lot of time. Portal milling machines with dual drives on the long axis benefit from the error outputs of the drivers, which allow the axis to be switched off in the event of an error.

We supply proven systems from Leadshine and JMC with the latest software.

System differences of the closed-loop drives

The industry offers two types of drives:

  1. Separate systems where the driver and motor are separate, and
  2. Integrated systems where the driver and motor form a single unit.

The driver is used to process the control signals and convert them into currents and voltages for the motor windings. It is powered by a power supply unit or by the mains voltage and provides interfaces to connect control systems. The drivers we offer all work with pulse/direction signals as provided by almost all control systems like Mach3/4, Eding, Estlcam, Beamicon, LinixCNC and various GRBL and Arduinoboards.

The smaller drivers and integrated systems are usually powered by 36V or 48V, Leadshine's 3-phase systems can be powered directly by 230V mains voltage.

Leadshine supplies separate systems, driver and motor. The advantage of these systems is that the electronics are well protected in the control cabinet and the motors are dust-tight, and produce less heat due to the separation. For this they cost a little more, but are also more flexible in the application, because of the programmability.

Leadshine offer 2 and 3 phase systems, the latter run directly on 230V mains voltage and do not require a power supply. They are available from 8 - 20Nm and thus drive even large machines. The 2-phase systems provide enough torque for small to medium sized machines with 3 - 8Nm and are usually operated with 48V. 

JMC supplies integrated motors, driver and motor form one unit. This saves costs, the motors are very cheap. The disadvantage of this solution is the higher waste heat and the lack of dust tightness. 
There are 2 systems: closed-loop stepper motors (iHSS) and servo motors (iHSV). The former are very easy to use, nothing needs to be set by software, you can start with them right after connection. The servo motors, like all servo motors, must first be set to the load via software. This can be a bit tedious and is not always easy. The adjustment is necessary to get a good step response, otherwise the drives can overshoot during braking, which can lead to cutter breakage and errors. Tuning is therefore important with servo motors.

What do I use now?

If you want to operate a CNC milling machine and do not need the last ounce of speed, it is better to use closed-loop stepper motors and connect them as directly as possible without a gear ratio. If dust, coolant and chips are to be expected, we advise separate systems that are better protected. If the price is very important, the attractively priced integrated systems come into question.
Who needs very high speeds at the axes and wants to drive highest accelerations needs servo motors, but then the tuning of the motors must be done.

Note on cabling

When wiring, please also note that the cables may be laid in energy chains, and then must be suitable for constant movement. Otherwise, cable breaks can occur after a few months, making expensive repairs necessary. We also supply inexpensive but high-quality shielded cables from Lapp Kabel that are approved for use in energy chains.


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