| Take a moment and look around you at how many | | | | The copper found in the motor assembly is not |
| everyday items require magnets to operate. You’ll | | | | compatible with certain chemicals found in some |
| be amazed! Microphones, loudspeakers, brush type | | | | adhesives. For example – Methacrylic acid can |
| electric motors and brushless electric motors all require | | | | result in corrosion to copper over time, with the risk of |
| magnets. For example, there are dozens of electric | | | | product failure. Check the Technical data sheet for the |
| motors in your automobile running everything from your | | | | details, or contact technical support to be sure. |
| mirror position to your windows and power steering | | | | Versatility- |
| and your car likely has a few loudspeakers. Virtually all | | | | In addition to bonding the magnet to the can, rotor, or |
| of these magnets are held in place by adhesives. | | | | speaker there are a variety of other adhesive |
| The proliferation of electric motors over the last few | | | | applications in motors, speakers and microphones. |
| decades is largely due to adhesives making electric | | | | Choosing a product that can be used for more than |
| motors more reliable. The alternative method of | | | | one application can increase your efficiency. |
| attaching the magnets is with the use of clips. Clips | | | | Process – |
| create a stress point on the magnet and due to the | | | | Before choosing an adhesive give some thought to |
| brittle nature of magnets, this stress can cause the | | | | optimal dispensing and curing scenarios for your |
| magnet to fracture and the motor to fail. Additionally | | | | project. Many magnet adhesives come in two |
| clipped magnet motors allow for vibration between the | | | | components which facilitates room temperature curing. |
| components and cause noise whereas bonded | | | | With magnet adhesives, you’ll also want to be |
| magnet motors run much quieter. | | | | sensitive to the risk of affecting the polarity or strength |
| Because there are so many types of magnets and | | | | of the magnets. Choose an adhesive that cures at a |
| motors there are many different adhesive choices. To | | | | low temperature to avoid damaging the magnets. |
| ensure you choose the best product for magnet | | | | There are several types of two component acrylic |
| bonding application take a few minutes to review the | | | | adhesives for magnet bonding. In some the two |
| application requirements of your project. There is a | | | | components are mixed before dispensing, others are |
| large amount of information available on this subject | | | | designed to dispense one adhesive on top of the |
| but don’t hesitate to contact the adhesive | | | | other, and a third type allows for an activator to be |
| manufacturer to review your specific requirements. | | | | applied to one component and the adhesive to the |
| Here are the key points to review about magnet | | | | other. Single component heat cured epoxies are also |
| bonding when considering which adhesive to use. | | | | used. |
| Strength and temperature resistance - | | | | Efficiency-The cost effectiveness of adhesive bonding |
| The operating temperature as well as the type of | | | | is the result of several factors. These include ease of |
| stress – (sheer, torque, or repetitive impact in | | | | application, consistent performance (reduced reject |
| speakers for example)- must be identified in order to | | | | rates) and efficient process, and all combine to |
| choose an appropriate adhesive. | | | | increase profits with improved production. |
| Chemical compatibility – | | | | |