Sprint Electric now offers drives
for slip ring motors. The new motor controllers will be introduced in November
at SPS/IPC/Drives, theinternational trade fair for electric automation, systems and
components, in Nuremberg, Germany.
A slip ring motor is a type of induction motor having a wound rotor
connected to slip rings. Typical applications for slip ring motors include
cranes, where the motors are used to control the hoist, as well as the X/Y
Sprint Electric's JL/X range of slip ring motor drives is a derivation of
the PL/X digital dc drive product range. It shares the same software and
hardware platforms and delivers the same precise digital control functionality
as the established PL/X range of dc drives. The main difference is that the
thyristor stack configuration has been designed to provide a 3-phase output (U,
V, W) suitable for controlling slip ring motors in either 2- or 4-quadrant
modes. All the fieldbus options including Profibus,
DeviceNet, CC-Link, EtherNet/IP, Modbus and CANopen, and configuration software packages used with the
PL/X, are also available for the JL/X range.
The JL/X range of slip ring motors covers
output currents from 100 to 1850 A and comes in three frame sizes with standard
supply voltage inputs up to 480V ac. Overload capability is 150 percent. For
high-duty applications, the JL/XHD range is available with an overload capability
of 250 percent. There is also the option of high-voltage units that are
able to accept ac supply voltages up to 690V ac for higher-voltage applications.
All models have the high-current 3-phase supply terminals in standard top
entry, with the motor connections being bottom entry. The JL/X is supplied
configured for crane control as standard with joystick or analogue demand inputs
and outputs needed to control up to four external slip ring resistors,
together with dedicated outputs for super-synchronous regenerative lowering and
Sprint Electric's full
range of products include analogue and digital dc drives from 12A up to 2,250A.
For decades, engineers have worked to combat erosion by developing high-strength alloys, composites, and surface coatings. However, in a new paper, a team at Jilin University in China turned to one of the most deadly animals in the world for inspiration -- the yellow fat-backed scorpion.
Green energy is being billed as a way to make communities that are energy deprived more self-sustaining. So it makes sense to use natural materials to create devices that harvest this type of energy. That’s the idea behind a hybrid wind/solar energy harvester made of bamboo that’s been developed by UVM researchers.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.