One way to improve servo system performance is to increase the gains in the control loop, allowing the system to respond faster to commands and to settle more quickly, with less oscillation. But increasing the servo gains means that any resonances in the system — typically due to mechanical compliance — are further amplified, which can […]
Drives + Supplies
What is external device monitoring and how does it relate to machine safety?
According to the Machinery Directive 2006/42/EC, technical protective measures should be used to reduce risks that cannot be avoided through safe design measures. These technical protective measures include safety devices such as door locks, covers, light curtains, and other equipment that monitors the machine movements. When the safety device controls and external device, such as […]
Controllers, drives keep pace with automation demands
With the advent of the coronavirus pandemic, there has been a surge in interest in automation across many industries. As demand for automation has increased, suppliers of automation components such as motors, drives, and controllers are seeing increased demand as well. Controllers and drives on offer today are more powerful and offer better performance than […]
What machine safety functions address speed, and when are they used?
The Machinery Directive 2006/42/EC states that when a machine manufacturer is unable to eliminate the risks of potential hazardous situations (for example, mechanical hazards such as crushing or cutting) through safe design methods, the next step is to reduce the risks through technical protective measures. These technical measures include protective devices, such as door locks […]
Motion system design: How to manage inertia mismatch
One of the most important parameters when sizing a motion system is the inertia of the load being moved. Regardless of the type of motor being used — AC induction, stepper, brushless DC, or AC servo — the ratio of the load inertia to the motor inertia has an important influence on system performance. If the […]
KEB America adds Modbus TCP/IP communication to S6 and F6 drives
KEB America, Inc. announces that the KEB F6 VFD and S6 Servo Drive now supports Modbus TCP/IP communication protocol. In addition to Modbus TCP/IP, the other supported Ethernet-based network communication protocols include EtherNet/IP, EtherCAT, ProfiNet, and Powerlink. “The variety of supported communication protocols in our drives give machine builders a lot of flexibility,” said Jonathan […]
What does embedded mean in the context of motion control?
Over the past several years, embedded solutions have found their way into the motion control space, with terms such as embedded motion, embedded motion control, and embedded motion controller commonly used in product descriptions and technical articles. Although there are no standard definitions for these terms, they all refer to some level of integration of […]
Common dc bus servo drives for applications with regenerative energy needs
The new MELSERVO-J5D servo amplifiers from Mitsubishi Electric Automation, Inc. offer a unique servo-based solution for applications that need to handle regenerative energy. The common dc bus servo drives are ideal for medium to large servo applications that require multiple drive units capable of managing regenerative energy. Available in 400 V and 1 kW to […]
Why do stepper motors vibrate and what are ways to avoid or dampen vibrations?
With each discrete step that a stepper motor makes, the inertia of the system causes the motor to slightly overshoot (or undershoot) the intended step angle. The motor then oscillates, or “rings,” until it finally settles at the commanded position. If the frequency of these step-by-step oscillations is at or near the motor’s natural frequency, […]
When is the application of overvoltage safe (and common) for stepper motors?
For most types of motors, operating with a supply voltage that is higher than the rated voltage — referred to as overvoltage — can cause an increase in current, and heat, high enough to damage the coils and other motor components. But in some cases, a stepper motor can be operated at a voltage higher than rated […]
