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Page 42


www.us-tech.com


PWM signal is particularly suit- ed for motors, because the time con-


stant of a motor is very long com- pared to the period of a PWM signal. This is why the brushed DC motor


acts as if the average of the PWM sig- nal was applied on the power leads. “When you first test the motor in


the lab, the EMI filter may perform well, but everything changes when you apply a PWM signal on the power leads,” explains Cambrelin. “You want to filter out the noise, but not fil- ter out the PWM signal. If you don’t choose the right filter, the motor may not even start.” This can be a problem for those who are not used to develop- ing differential LC filters. With monolithic EMI filters,


there is no need for special skills in filtering — the response of the filter (rejection of common-mode noise ver- sus frequency) is provided directly by the manufacturer. Johanson Di- electrics even provides an online tool that simplifies the choice. The company is also working on


an integrated solution for brushed DC motors that will enable mounting the monolithic EMI filter directly on the housing, without the need to manufacture a PCB. “EMI issues are just going to be- come more of a problem with the


March, 2020


Advanced EMI Filters Keep Brushed DC Motor Costs Low Continued from previous page


higher frequencies that come with Bluetooth, Wi-Fi and now 5G de- vices,” says Cambrelin. “That means EMI filters will have to handle wider frequency ranges, while allowing the


Johanson Dielectric is working on an integrated solution for brushed DC motors that will enable mounting monolithic EMI filters directly to the housing, eliminating the need for a PCB.


appropriate signals to pass through.” This also helps OEMs to meet regula- tory standards that exist in most countries that limit the amount of noise that can be emitted. Contact: Johanson Dielectrics,


4001 Calle Tecate, Camarilla, CA 93012 % 805-389-1166 E-mail: emi@johansondielectrics.com Web: www.johansondielectrics.com r


wire stripper The programmable Mira 340 is designed for


universal use while maintaining maximum precision. It is perfect for processing wires and insulation material with demanding requirements. The Mira 340 is fitted with a rotary head with 4X-blades and offers unique functions designed to reduce production time and increase quality. Thanks to sequential processing, multi-conductor cables and multi-layer insulation material can be processed quickly, thereby saving time and increasing productivity.


MIRA 340


LK Metrology Launches Portable Measuring Arms


Brighton, MI — LK Metrology has launched its FREEDOM series, a range of 24 portable measuring arms. The line includes a six-axis model for touch probing and a seven-axis version for multisen- sor metrology, including laser scanning. Both are available in two accuracy levels. The four products come in six sizes with a reach of up to 16.4 ft (5m). The arms are well-suited for


komaxgroup.com


use in line-side measuring and in- spection in factories, while their compactness makes them excel- lent for use on machine tools for in-process quality control. Carbon fiber tubular construc-


tion ensures stability under chal- lenging conditions. Infinite rotation and a proprietary counterbalance


make manual movements light, which promotes ease of use, even when trying to access awkward areas of a component. Wi-Fi connectivity


FREEDOM series portable measuring arm.


and battery power allow completely portable wireless touch probing for maximum flexibility. The arm can be stowed and locked in place between measurements and when it is being relocated. The largest model weighs less


than 24.3 lb (11 kg), making set-up and repositioning quick and easy. A notable feature of the arms is


the inclusion of absolute rather than incremental rotary encoders to feed back the angular position of every joint to the control software. The equipment may therefore be used im- mediately on startup, avoiding the need to calibrate the probe before use every time. This raises productivity, as does


the highly repeatable probe connec- tion that allows them to be swapped quickly without interrupting the measuring process to recalibrate. Contributing also to efficiency


and convenience is an LCD display with a quick-access menu on the probe wrist, putting the most useful information directly in the hands of the operator during measurement. Contact: LK Metrology, Inc.,


12701 Grand River, Brighton, MI 48116 % 810-263-6100 E-mail: marketing.us@lkmetrology.com Web: www.lkmetrology.com


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