FAQ

Vacancies are advertised on our careers page and applications can be completed there. You can also send your CV/application directly to schloesser@groschopp.de. You can also send your documents to us by post.

Groschopp AG
Drives & More
Greefsallee 49
D 41747 Viersen
Postfach 100561

As a global player, Groschopp offers the ideal environment for your professional and personal development. Regardless of whether you already have professional experience or would like to get started after graduation - with us you can actively contribute your know-how, your skills and your ideas. You can find all current vacancies on our careers page at 👉 www.groschopp.de/de/karriere. However, we also welcome unsolicited applications! If there is no suitable position advertised, but you are convinced that you would be a good fit for Groschopp, please send us your application documents. We review each application individually.

What are the differences between various brushed motors and commutator motors? You can find out the different properties and their advantages here!

Especially if you are looking for simple and cost-effective motors, brushed motors are a sensible option for your project. You have probably already found out that there are different types of commutator motors. These often differ in the circuit types series connection, double connection or shunt connection. But what exactly are the differences and which of these motors is suitable for your project? Let's find out!

You've probably already found that the electric motor you chose was too complex, required a lot of control effort or had too little starting torque. This can be very important, especially with household appliances or robots.

But let's talk about brushed motors first. A brushed electric motor consists of a rotating rotor and a stationary stator. In the stator, either a winding or a magnet provides a constant magnetic field (or excitation field). The rotor winding is supplied with current via mechanical carbon brushes and the commutator (also known as the current inverter). The commutator therefore ensures that the direction of the magnetic field in the rotor keeps changing and is therefore attracted by the excitation field. This sets the rotor in motion.

Incidentally, there are three common types of brushed motors: series wound, shunt wound and double wound:

1. Series connection:

A series-wound or universal motor can be operated with direct or alternating current. The armature and the motor winding are connected in series. This means that the same current flows through both windings. When the motor starts up, the current in the stator and rotor therefore increases at the same rate, generating a high starting torque.

That's right! A series-wound motor is well suited for applications that require a high starting torque, such as household appliances and simple electric hand tools such as hand drills. Under load, the series-wound motor exhibits self-regulating behavior, but it must be noted that the speed increases sharply without load.

Series-wound motors are insensitive to short-term overloads.

2. Shunt connection:

In contrast to series connection, the stator winding and the rotor winding are connected in parallel in shunt connection. This results in a speed that is relatively independent of the respective load. A shunt-wound motor is well suited for applications where a constant speed is required, such as pumps or fans. Shunt-wound motors are also popular in lifting and conveyor technology. You can also overload shunt-wound motors for short periods of time.

3. PMDC or permanent magnet DC motor:

PMDC motors are very closely related to shunt wound motors. The difference between the two types is that the stator of the PMDC does not require any current to generate the excitation field. The PMDC is more efficient than the shunt-wound motor. However, you must be careful not to overload this motor. It is generally more sensitive to temperature. If you exceed the maximum permissible current or the maximum temperature, the motor will be destroyed. PMDC motors can be found in various industrial applications, but also in medical technology.

4. Double closure: The double shunt motor combines both the series and shunt drive.  It has two excitation windings. One is in series with the armature and the other in parallel. . This type of motor offers both the high starting torque of the series connection and the speed control options of the shunt connection. Shunt-wound motors are used in areas such as hoists and machines with variable torque requirements.

As you have just learned, the group of brushed motors is a motley crew with very individual characteristics. Now that we know the general structure and characteristics of the different types of brushed motors, we'll show you the top three advantages of these motors:

However, I would like to mention the following disadvantages first: Basically, the efficiency is slightly worse than with BLDC or servo motors, for example. In addition, the brushes of the motors may have to be changed regularly.

Absolutely correct!

However, there are also considerable advantages:

1. the low costs: Although a lot of know-how goes into the design of the motors, the motors are rather simple and therefore inexpensive.

2. a robust design: Motors without magnets in particular can be significantly overloaded for short periods without being damaged. This is not possible with other motor types.

3. a simple control system: The speed can be changed by changing the voltage. You don't need any complex electronics for this. This makes the motor cost-effective and robust.

Now that you know about the advantages and different types of commutator motor circuits, GROSCHOPP is the right place for you. From small drives for particularly efficient projects to high-performance motors, we have plenty in our range.

You probably know the situation: there are sooo many electric motors out there, many of them fit your requirements, but in the end you still have a few on the shortlist and can't decide which one is best suited to your project.

You've probably already had the experience that the electric motor you chose ended up being too weak or completely oversized for your application. To avoid this, here is a simple 3-step plan to avoid this in the future:

Step 1: Define exactly what you want your motor to do, taking into account the environment in which it will operate.

To do this, define so-called operating points in which you specify exactly which activities the motor should perform at which speed. Operating points are speeds at which the motor should fulfill your expectations.
You should also think about the environment in which the motor will be operated. For example, there are motors that have to cope with high temperatures, moisture and splash water, vibrations or chemical loads.

Step 2: Select the motor based on the required power, i.e. torque, speed and acceleration.

For example, if you want to build a hoist, the power required is calculated from the force and speed. 
If you already have an application and want to optimize the drive required for it, we will show you in the next video how to determine the power required.

Step 3: Don't forget to optimize the motor to the rated speed to maximize motor efficiency and minimize power consumption  

Consider whether you need a gearbox to adjust the speed and then select the motor accordingly. The rated speed is the speed at which the motor operates most efficiently. If you have a motor that runs slower or faster than the rated speed, it will lose efficiency, meaning it will require more power and may get warmer than necessary. A gearbox helps you to get the desired power from the motor at its rated speed.
If you already have a Groschopp motor in use and are looking for a replacement, you will find all the necessary data on the rating plate, which is located on the motor as a sticker.

Now that you know the size of the motor, GROSCHOPP is the right place for you. From small drives for particularly efficient projects to high-performance motors, we can suggest and supply you with a reliable solution. If necessary, we can design a motor to suit your requirements.
 

What types of electric motors are there and which one is right for your project?

You have probably already discovered that there are many different types of electric motors. To ensure that your project works technically AND stays within budget, you need to know exactly which motor types are the right ones.

You've probably already had a motor that wasn't designed correctly, didn't meet your requirements and gave up the ghost too soon. Another common problem is that the motor cannot be regulated precisely enough or simply consumes too much power in practice.

To avoid this, here are the most important features you need to know in order to choose the RIGHT electric motor.

1. Service life and load capacity:
It is important to consider the service life of the motor and its load to ensure that it is suitable for your application.

2. Voltage:

When selecting the right electric motor, it is very important that you first check which voltage source your motor will ultimately be operated on. Which sources are available locally and does the selected motor match the existing voltage sources?
Which voltage source should your motor be operated on? In the simplest case, is it a 230 V socket, a 400 V three-phase connection or a 12 V car battery?
The selected voltage supply has a direct influence on the power consumption. If the voltage is doubled, the current is halved at the same time.

3. Characteristic curve:

The motor's characteristic curve is derived from the operating points that are formed by comparing speed and torque. Check which motor best matches this characteristic curve. For example, a series-wound motor has a high starting torque, while an induction motor is an economical solution for an application that is only to be operated at one operating point. A servomotor can be precisely controlled. The subject is complex, so if you are not sure, just give us a call and we will find a solution that fits your application exactly.

3. Controller:
Consider whether you need to vary the speed or power of the motor. In this case, you may need a controller. This could be the case with a conveyor belt, for example, which has to run at different speeds.

So, now that you know the different motor types and application specifications, GROSCHOPP is the right place for you. From small drives for particularly efficient projects to high-performance motors, we have plenty in our range.

Has your electric motor overheated? Find out what you need to look out for now and how to get it running again quickly in this description. 
Are you familiar with this?

Your project has come to a standstill and the motor won't move an inch. If a motor overheats, it could cause a defect. But how did this happen in the first place? Troubleshooting can often become a mammoth project.
It has probably happened to you, or you are currently in the situation where the electric motor you have chosen gets very hot or even overheats during operation. Of course, you could assume that the motor itself has a technical problem, so you replace it and are faced with exactly the same problem a little later.

Often, when a motor overheats, the first thing you think is that the motor is faulty and has therefore broken down - but this is usually not the case at all, and the problem can be fixed in a few simple steps. 92% of overheated electric motors can be fixed as follows:

Tip 1:

Check the ventilation openings of the electric motor. Blocked ventilation openings can restrict air circulation and cause the motor to overheat. Ensure that all ventilation openings are free of dust, dirt or other obstructions.

Tip 2:

Take the ambient temperature of the electric motor into account. If the motor is operated in a hot environment or is in operation for a long time, this can lead to overheating. Therefore, make sure that the ambient temperature is within the permissible range.

Tip 3:

Check the current consumption of the electric motor. Excessive current consumption can lead to overheating. Ensure that the application runs smoothly and that the current consumption of the motor matches the requirements.

Tip 4:

Pay attention to the altitude at which the motor is operated. In high-altitude applications, the low air pressure can cause the motor to become hotter than expected. Make sure that the motor is designed for the altitude at which it is operated.

Tip 5:

The size of the electric motor. Also check whether the motor is the right size for the application, as an incorrectly sized motor can also overheat.

Now that you know what to look out for in electric motors to prevent them from overheating, GROSCHOPP is the right place for you. From small drives for particularly efficient projects to high-performance motors, we have plenty in our range. Alternatively: From energy-efficient drives to motors with a high power density, we have a lot in our range.
 

Find out here how to install a gearbox correctly in an application, what is important when installing a gearbox and why you should pay particular attention to correct cooling!

The environment of a gearbox in your application is crucial for its proper functioning. You will also find out why the amount of lubricant depends on the installation position and what can happen if you don't pay attention to this.

So pay attention if you are interested in this topic!

Perhaps you have already been in a situation where a gearbox has overheated or even failed! A breakdown caused by a defective gearbox is always very expensive and it is not uncommon for the entire gearbox to have to be replaced. Not to mention the follow-up costs. In most cases, the cause of the failure is incorrect installation of the gearbox.

Here are some important points to consider during the design phase before installing a gearbox:

1. Groschopp gearboxes and motors form a drive unit and are matched to each other. Assembly is usually carried out in the factory, so that no problems are to be expected.

2. When designing the gearbox, it is important to ensure that it is easily accessible. This not only facilitates assembly, but also enables the necessary cooling. A gearbox must be able to “breathe” in order to dissipate the heat loss caused by the power loss (more on this later). For this reason, a gearbox must not be installed too tightly.

3. In any case, make sure that the gearbox is properly lubricated. Not only the type of lubricant is important, but also the quantity. If there is too little lubricant, the gearbox wears out more quickly. Both too much and too little lubricant will cause the gearbox to heat up excessively. The amount of lubricant required depends on the installation position. It is essential to find out about this in advance!

4. An important aspect when installing the gearbox is the heat flow in your application. Both the electric motor, the gearbox and your application generate heat. On the other hand, all components can also contribute to cooling. Therefore, these components must always be considered in context.

5. The output shaft of the gearbox must not be overloaded! In addition to the obvious forces and torques, failures caused by misaligned gearboxes or over-tensioned belts are more common than you might think.

So, now that you know what is important for the correct installation of gearboxes in your application, GROSCHOPP is the right place for you. From small drives for particularly efficient projects to high-performance motors, we have a lot in our range.

Yes, we offer professional repair and maintenance services for our motors, gearboxes and controllers to maximize the service life of your drive systems. Our aim is not only to provide you with reliable support, but also to create sustainable solutions with genuine quality - in line with our guiding principle "Sustainability through quality.

Groschopp is a manufacturer and full-service provider of electrical drive technology - from development to production and service. All motors, geared motors and controllers are developed, manufactured and assembled in-house. Both at our site in Viersen and in China. When implementing new projects, we cooperate directly with the original equipment manufacturers (OEMs).

Our sales and service partners are organized regionally to be able to help you quickly and specifically. You can find the right contact person for your region with just a few clicks via our online representative overview at https://www.groschopp.de/en/representatives. Alternatively, we will be happy to support you personally - simply contact us by phone on +49 (0)2162 374-0 or by e-mail at info@groschopp.de.

You can report complaints and returns simply by sending an email to info@groschopp.de. Please include the invoice or order number, item number, a brief description of the problem and, if applicable, photos of the item. Upon receipt of your request, you will receive further information on the process and, if necessary, the return shipment.

Groschopp AG has been in business since 1948. The company was founded as EMW Elektro-Motoren-Feinbauwerk Groschopp & Co. GmbH in Mönchengladbach-Rheydt. In 1954, it moved to its current location in Viersen. In 2000, the company changed its name to Groschopp AG and has been known as “Drives & More” ever since. In August 2023, Groschopp celebrated its 75th anniversary with an anniversary party .

We attach great importance to sustainability and have documented this in detail in our sustainability report. The products are made from 100% recyclable materials and are designed to be durable and repairable in order to conserve resources. Groschopp relies on energy-efficient production, uses CO₂-minimizing energy sources and works continuously to improve its energy consumption. Groschopp also meets the requirements of the German Packaging Act and offers sustainable packaging solutions. As a member of the UN Global Compact, the company is socially committed to fair working conditions, environmental protection and ethical business practices. Overall, sustainability is a central component of Groschopp's corporate strategy.

Groschopp AG is active in a wide range of industries and offers customized solutions in the field of electrical drive technology. Its products and services are used in the following areas:

• Chemicals & pharmaceuticals: Drives for process automation in the chemical and pharmaceutical industries.
• Food industry: Solutions for the industrial processing of foodstuffs in compliance with high hygiene standards.
• Textile industry: Drives for various processes in textile production, such as spinning, weaving and knitting.
• Power distribution: Drives for circuit breakers in the high and medium voltage sectors.
• Pump technology: Drives for various pump applications that convey cold and hot media.
• Conveyor technology: Solutions for material flow and handling of goods in production processes, including conveyor belts and dosing systems.
• Storage systems: Drives for automated storage systems in mechanical and plant engineering.
• Medical technology: Drives for innovative medical technology devices, which are increasingly needed due to demographic change.
• E-mobility: Drives for electric vehicles that are compact, lightweight and cost-efficient.

Groschopp sees itself as a full-service provider and partner for the entire drive train, from development and design through to production and service. The company offers solutions for small and medium-sized systems and places particular emphasis on durability, operational reliability and flexibility.

Yes, our service does not end with the purchase. We offer long-term support, spare parts supply and technical advice throughout the entire service life of your system.

Our team is available on weekdays from 7:00 to 17:00.

To meet or exceed our customers' requirements and increase customer satisfaction through continuous improvement.

Groschopp sells various types of electric motors, including

• Alternating current motors (AC motors): Robust and low-maintenance, suitable for conveyor technology, pumps and ventilation systems.
• Direct current motors (DC motors): With brushes, permanent magnets or brushless (BLDC), ideal for medical technology, robotics and household appliances.
• Servo motors: High-precision motors for industrial automation and robotics.
• Stainless steel and hygienic motors: Stainless and easy to clean, especially for the food and pharmaceutical industries.
• BLDC motors (brushless direct current motors): Efficient and maintenance-free, used in medical technology and safety applications.

In combination with our gearboxes and control units, we create customized complete solutions that are precisely tailored to the individual requirements of our customers.

Die Groschopp AG arbeitet mit verschiedenen Partnern zusammen, um innovative Antriebslösungen zu entwickeln und anzubieten. Diese Kooperationen erstrecken sich über Forschungsprojekte, industrielle Partnerschaften und internationale Vertretungen. Groschopp engagiert sich aktiv in Forschungsprojekten, insbesondere im Bereich Elektromobilität und Fahrerlose Transportsysteme (FTS). Ein Beispiel hierfür ist die Zusammenarbeit mit der Technischen Universität Novi Sad in Serbien, bei der ein autonomer Müllsammelroboter entwickelt wurde, der mit Groschopp-Servomotoren ausgestattet ist. Dieser Roboter gewann den Eurobot-Wettbewerb 2022.

Groschopp also participates in projects funded by the German Federal Ministry of Education and Research (BMBF) in order to translate technical and progressive goals into future-oriented products. Groschopp has been a member of the UN Global Compact since 2011 in order to set a visible example of its commitment to sustainability. The company supports the goals in the areas of human rights, labor standards, environmental protection and anti-corruption through responsible action and continuous development in social and ecological areas. Groschopp also participates in the Clean Planet Program and thus makes a valuable contribution to the conservation of natural resources.