DRIVES, CONTROLS & MOTORS PRODUCTS & APPLICATIONS NEW RANGE OF MOTORS OFFERS BENEFITS TO POWER TOOL DESIGNERS
When designing an industrial power tool, choosing the right motor is essential. After all, whether the tool is fastening, gripping or cutting, there is a specific motion profile that is split into two phases. First is the speed phase, during which the motor operates at a faster free-run speed that reduces cycle time and boosts productivity. Then, during the torque phase, as the tool carries out more forceful work, the need for torque becomes paramount. A motor that delivers high peak torque can perform a wider range of tough jobs without excessive heating. These alternating speed and torque
cycles must be constantly repeated in demanding industrial applications. The different speed, torque and duration characteristics complicate the motor selection process, calling for a design that minimises losses to achieve the best solution. This is even more critical for battery operated tools, where only limited power is available yet the maximum number of operations from a single charge is needed. In the past, design engineers would have had to
accept a performance compromise for the different phases of operation. Now, however, Portescap has developed a new range of brushless slotless motors optimised for use in power tools that go a long way to minimising the traditional design compromise. In such applications, brushless motors have
inherent advantages over brushed motors. Brushless
motors are less susceptible to mechanical wear, can be operated at much higher speeds (shortening cycle time and increasing productivity) and can sustain high peak current, providing far greater life in the hand tool. In terms of power density, a brushless slotless motor is a better option than slotted, providing superior ability to maintain speed under load.
Portescap’s new Ultra EC family of brushless slotless motors employs a revolutionary and patented U coil
technology. These miniature motors contain a winding that is parallel to the motor axis, unlike the skewed arrangement of a conventional slotless motor. Perpendicular magnetic forces are minimised, reducing copper losses and enabling the motor to develop more power, the company explains. Furthermore, iron losses at high speed in
slotless motors are already greatly reduced compared with slotted designs. With this new straight winding, Ultra EC motors have a shorter rotor length which allows for a lower rotor inertia and further reduced iron losses. This new design is said to optimise speed and torque in a compact package for the most challenging of applications.
Portescap
www.portescap.com LOW POWER VARIABLE SPEED DRIVES LAUNCHED
Designed for decentralised installation, WEG’s compact MW500 VSDs are now available for operating induction motors with low power in the range of 370 to 550W. The robust
MW500 supports both voltage vector control (VVW) and V/f characteristic curve control. In addition, it can handle an overload of 150% for 60 seconds every ten minutes
and can be deployed at ambient temperatures – up to 40˚C wall mounting or 50˚C for motor mounting. With a housing that
offers protection rating IP66 or NEMA 4X, the VSDs can be
mounted directly on
the motor terminal box or on the wall using an
adapter plate. This eliminates the need for a motor feed cable and switch cabinet, allowing
users to install the MW500 close to the controlled motor. The standard version comes
with a PID process controller, an integrated PLC, an EMC filter compliant with EN 61800-3, and an analogue speed control potentiometer. Digital I/O and communication protocols such as CANopen, DeviceNet and Profibus DP are available as optional extension modules.
WEG
www.weg.net
DIRECT DRIVE MOTOR RANGE
Now available from INMOCO, Celera Motion’s Omni series direct drive motor range features high torque density in a compact design. Additional features include high acceleration, zero backlash and high mechanical stiffness, as well as low inertia and reduced settling time, enabling the range to provide optimal control accuracy of highly dynamic axes. Furthermore, low cogging also delivers accurate and smooth motion. With their low
footprint design and minimal compact cabling, the motors can be used within robotic axis joints. Based on a frameless construction, these are integrated within a robot joint to drive a high ratio gear set. The Omni Series comprises the UTH
high torque motor, UTL low to medium torque, and the UTO for applications which require an outside rotating configuration. The UTH high torque motor achieves a peak torque of 47.7Nm, a continuous duty of 15.9Nm, and a maximum speed of 5,000 rpm, with an outside stator diameter of 533mm. The motor enables low stator and rotor mass in a thermally efficient package, crucial for medical robot joint applications. The series can also be customised
with windings, stator lengths, flanges and form factors to meet application requirements. Celera Motion’s application engineering team works directly with OEMs to develop customised projects – rotary stages, electronics, controls and encoders. This also means that Celera Motion is equipped to develop a complete mechatronic sub-system.
INMOCO
www.inmoco.co.uk
AC DRIVES OFFER ENERGY-EFFICIENT MOTOR CONTROL
Omron’s Q2V series of compact inverter AC drives, which are expected to be of benefit for market sectors such as food, beverage and packaging, along with many industrial motor-control applications in general, are now available from RS Components. The drive controls the frequency of power supplied
to AC motors that control the rotational speed and acceleration of pumps, fans and various other industrial machines. According to the company, it offers high flexibility and energy-efficient motor control for almost any type of motor. Compact, protected from dust and humidity, and designed
for ten years of operation in temperatures up to 50˚C without maintenance, the drives also offer easy installation. The Q2V series handles heavy duty and normal duty
options, enabling the same inverter to drive motors with different ratings depending on the load. It also integrates special motor-control methods to drive motors in the most efficient way. Power ratings types include: 200V single-phase for 0.1 to 4kW; and 400V three-phase for 0.37 to 30kW.
RS Components
https://uk.rs-online.com/web/
/ DESIGNSOLUTIONS DESIGN SOLUTIONS | MARCH 2020 15
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