New compact soft starters and micro VFD drives have been added to the AutomationDirect motor controls lineup which encompasses simple manual controllers, motor contactors and starters, drives and soft starters. WEG SSW05 and SSW07 soft starters are compact, fully digital soft starters with a DSP controller designed to provide great performance on motor starts and […]
New frame sizes, features for soft starter family from WEG
WEG has extended its SSW900 series of soft starters to include frame size E for the current range of 480 to 670 A. The series previously consisted of four frame sizes A to D, covering output currents from 10 to 412 A in the voltage range of 220 to 575 V 3-phase ac. These compact […]
Motion system design: Can a servo-driven machine be too stiff?
When we think of stiffness, we often think of mechanical stiffness — the ability of a part or system to resist deflection. But in servo-driven motion systems, stiffness can also refer to how the system is tuned — that is, how the gains in the servo controller are set and, correspondingly, how the motor responds […]
Servo amplifier with multi-network interface from Mitsubishi Electric
The MR-J4 servo amplifier series from Mitsubishi Electric incorporates a multi-network interface called “Servo Open Network”. It enables the user-friendly drive to be compatible with all relevant motion control systems worldwide. Machine manufacturers who offer their solutions globally will benefit from the open network connection feature of the MELSERVO MR-J4 amplifier series. Communications is simplified […]
High bus voltage stepper drives and motors from AutomationDirect
AutomationDirect has added a high voltage ac drive and compatible high torque motors to its stepping system motion control product offering. The ac stepper drive is powered from 90 to 240 Vac and is intended for use with step motors designed to handle a high bus voltage of 340 Vdc. MTRAC motors are specially designed […]
Leadshine 2-phase digital stepper drives from AutomationDirect
Leadshine 2-phase digital micro-stepping drives with micro-stepping motor movement and anti-resonance for optimal torque, provide extra smooth motion, low motor heating and noise. These drives accept a wide range of input voltages (12 to 110 Vdc, 18 to 80 Vac) and provide over-voltage and overcurrent protection, motor auto-configuration on power up and Soft-start at power […]
What is a DC bus choke and why is it used?
In a recent post, we looked at motor chokes — inductive devices installed between a drive and motor — and why they’re used in servo systems and variable frequency drives. But in variable frequency drives (VFDs), inductors can also be placed after the drive’s input diodes, between the input rectifier and the DC bus link. […]
AC drives for motor and motion control
Today’s VFDs perform far more than just traditional motor controls. Some include computing, I/O handling, and even motion-control capabilities. Such intelligent drives excel in smaller and localized systems. Case in point from material handling: Some VFDs with onboard PLCs work for motion control on infeed conveyors. In one specific case, a photoeye and tower light […]
What is a motor choke and why is it used?
A choke is a passive device that adds inductance to a circuit. Inductance is a property of a coil of wire that resists any change to the current flowing through it. (Straight wires also possess a small amount of inductance.) In other words, if current through the coil increases, the magnetic field of the coil […]
What is a constant voltage drive for a stepper motor and when is it used?
There are two fundamental types of stepper motor drives: constant voltage drives, which supply a fixed voltage to the motor, and constant current drives, which manipulate voltage to ensure that a constant current is delivered to the motor. Stepper motor electrical basics The most fundamental equation governing the behavior of a stepper motor is Ohm’s law, […]
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