In Automation Magswitch tools fill two categories, pneumatic actuated tools and electric actuated tools. In pneumatic tools does not rely on a constant source of vacuum or air pressure to operate. Our pneumatic cylinders are used for app. 300-400 milliseconds for an on and off cycle, the balance of the part movement time uses no air, when compared to other products Magswitch uses app 90% less air. This is a significant saving and often energy savings repay capital cost in around 12 months. Magswitch E-Tools(electric) can eliminate all air requirements in a body and white production line. The Magswitch e-tool only requires an electric pulse for as little at 100milli-seconds to turn on and to turn off. Both The e-tools and the p-tools(pneumatic) do not require energy to hold position. This means in the event of a power down they fail safe and hold position, no parts dropped. What does Magswitch fail safe mean? Electromagnetic and vacuum lifting systems are costly in the long term regarding energy and maintenance costs. Magswitch ‘Greentech’ technology will offer you significant savings in energy and repairs while increasing productivity. Custom Solutions Now, the cool part about a Magswitch ® is that you can turn it OFF. Here’s where the magic happens.

across switch) EDIT 2018-03-29: The switch resistance measured above was taken from the two pads on the board. While testing the other 5 boards I noticed that the resistance was 25% lower when measured from the copper landing that I had placed near the sources of M1 and M2. That's significantly lower, which I did not expect. I connected up two more boards, using the landing pad for the B- lead. Here's what I measured with that configuration: 1.0mΩ @ 1A for the board using SS28 FETs. 1.2mΩ @ 1A for the board using IRLHM620 FETs. In the end, I did get a pretty good improvement in switch resistance from the SS28 devices. The Magswitch magnetic fixturing clamp will secure your fixture into place. Rotate the knob to turn on and off 95 pounds of magnetic hold force. Simply drill a hole in a fixture and place the MagJig in to use for downward pressure clamping. FEATURES & BENEFITS Downtime is eliminated with Magswitch, unlike traditional steel lifting systems. With a 100% duty cycle, no more standing or waiting around. Cost Savings It’s a great demonstration of how it works. Initially, when building it, we thought we might show all the details so our readers could learn how to do it themselves (and maybe buy some K&J magnets to do it). However, we learned that assembly is a real challenge. We also found that we spent more money on magnets and parts from the hardware store than if we had just bought a Magswitch ®. The Pareto Principle is often used as a tool for prioritization and optimization. By identifying the 20% of causes that are responsible for 80% of the effects, individuals and organizations can focus their efforts and resources on the most important areas and achieve greater efficiency and effectiveness.

Next Step:

I've decided to pursue four types of switches. One for low current/low voltage applications such as RC gliders without motors. Two with higher current and voltage for motorized RC aircraft. A fourth with an integrated battery eliminator circuit (BEC). Low Current Switch Specs:

This all looked pretty good. I decided to see what the input transient voltage waveform looked like for a couple of different battery types: There may be some users that want to locate the hall-effect sensor away from the main circuit board. I added pads to allow leads to be soldered instead of mounting the sensor on the board. Not much is different. The change is to the FETs and how they are driven. Previous magnetic switches were driven with 5V gate voltage. This circuit level shifts the gate voltage of the output switching FETs to 12V to extract every bit of RDSon that the FET is capable of providing.I assembled one of the second pass 30A prototypes using different FET switches than the first pass -- substituting a Vishay SiSS28DN for the IRLHM620. The Vishay part claimed slightly lower RDSon (1.6mΩ vs. 1.8mΩ @ VGS = 4.5V) and a higher max VDS of 25V instead of 20V. I thought, erroneously, that the higher voltage rating might improve the survivability of input transients when batteries are plugged into the input. The addition of R1 between the input and the LDO solves the problem by eliminating the capacitor (C2) that caused the ringing so a higher voltage rated FET is not required to support 2S-4S LiPo batteries. Magswitch Technology, a worldwide leading manufacturer of switchable magnets, the introduction of the original MagPry was revolutionary new way to align steel plates or press stiffener beams in shipyards. Changing the Way Things Were Done Change the hall-effect switch to increase the trip threshold. The S-5716ACDH2 component is specified with a typical threshold of 45 Gauss vs. 35 Gauss for the AH180 part. The minimum specified threshold is 25 Gauss. Passive shunting is where extra steel in the magnet housing is added to absorb “stray” magnetic field in the Off position. Typically, a passive shunting magnet has one large magnetic circuit. Why is Passive shunting less effective than a Magswitch active shunting magnet? Edit 2020-02-02: BHarbour pointed out my laziness in his comment. The following is a bit of extra work to solidify the design.] Reducing the standby current:

Our products are designed to be ‘fail safe’ since there is no need for any power during a lift. With a positive indication of the magnetic circuit, the operator can confidently perform knowing the material is fully attached. Magswitch offers Electric, Pneumatic, or Manual for ‘on-off’ actuation. Performance It is now tolerant of the input transient caused by plugging a 4S LiPo battery into the inputs -- there is no measurable ringing. I used a 22Ω 1W resistor for an easy load test. The BEC did not have a problem with this load and the output decreased only about 20mV over the entire input voltage range. This is what the input transient looks like without any circuit changes made for protection and R2 = 25mΩ for the battery resistance: With load current 35A, the voltage across the switch was 40mV (that's 1.1mΩ). Power dissipation is only 1.3W, which should not be a problem for a board even this small. I repeated the measurement with 20A load current and got 22mV across the switch, and the same switch resistance. No changes required. So here's the plan:It’s a great magnet-science demo, but you’re probably not going to save money with assemblies like this. It's easier and less expensive to just buy an MJ-95 or MJ-150 and get on with it. Our dual roller guide has a dual set of roller bearings to firmly support the smooth gliding of wood through a blade. Requires our Woodworking Starter Kit and mounts to the Universal Mounting Base and MagJigs, sold separately. Resaw Guide

Magswitch products have flexible options to handle your lifting needs & adapt to odd or round shapes. Downtime Most of the extra area is for the larger area required by M1 and M2. I added space between U2, the Hall effect switch, and the high current ground trace -- hoping 3.5mm is adequate distance to prevent the switch from tripping off during high current events. If that doesn't work, then the Hall effect switch will have to be moved off the board. The landing pads for B+, B-, OUT+ and OUT- are not through hole -- I decided that the large 12-14 AWG stranded wire would undergo a severe 90° bend if forced into a hole, so now the wires are simply soldered to a landing pad. The landing pads will accommodate up to 120mil diameter wire (12 AWG). In addition, there are numerous vias to help spread the heat and conductance between the top and bottom layers. The board will use 2 oz. copper for improved heat dissipation.

3 Comments

Load regulation is hard to measure without an electronic load, but seems to be better than the line regulation. In what direction is a force pulling on the magnet? This also matters a great deal. You’re not going to be able to apply 150 lb of shear or sideways force against an MJ-150 and expect it not to move. This is true of all magnets. At Magswitch, we strive to ensure every Magswitch tool makes the work place safer, improves productivity, is maintenance free, reduces energy consumption, is easy to use and has an ROI measured in weeks or months. In short, a Magswitch tool is designed to exceed customer expectations! The MagPress is part of a family of welding, lifting and fabrication products, that reduce project cost to complete and days to deliver. Major shipyard customers say, “Using Magswitch tools helps us save over 20 hours every week of unproductive fitting and grinding just on one substructure!”