X2Y Motor Application Notes

X2Y Motor Application NotesGUIDELINE 1.It is important to recognize that X2Y is a bypass component. Because the chiphas side terminations, it is often confused for a feed through. X2Y’s filteringcharacteristics are maximized as a dual line bypass device.X2Y

X2Y Motor Application NotesGUIDELINE 1. (Continued)Both ground terminations of X2Y, (G1 and G2), must be attached toground for maximum noise attenuation.G1ABG2

X2Y Motor Application NotesGUIDELINE 1. (continued)These two insertion loss graphs illustrate the results of grounding X2Y properlyThis graph shows the effect of connecting justone of the ground terminations of the componentWhen two terminations are attached impedanceis lowered and the resonant frequency of thecircuit is shifted higher by 80 MHz.

X2Y Motor Application NotesGUIDELINE 2.Remove all currently used suppression.. The X2Y 0.4uF is the best value to start withfor broadband filtering.X2Y 0.4uF

X2Y Motor Application NotesGUIDELINE 3. Provide a metal or metalized motor housing. This is necessary becausewhen X2Y is attached properly to the motor housing, the housing itself is used incombination with the component as a reference to cancel the noise (antenna theory).Note: The motor itself does not need to be grounded.Plastic motor housingMetalized motor housing with plastic end capPlastic end capPlastic end capImproved

X2Y Motor Application NotesGUIDELINE 3. continuedHere is an example of a motor with a metal housing and plastic end cap.Inside the plastic end cap are metalized ground tabs that stick out andmake contact with the motor housing when the two are pushed together.The previous suppression has been removed and a single X2Y is installedbetween the power leads, then both ground terminations of the componentare soldered to the ground connections of the plastic end cap.Metal contactsMetal contactsMetal contacts

X2Y Motor Application NotesGUIDELINE 5.If possible, provide a metal or metalized end cap. This will help with containment offields that can radiate around the plastic end cap and couple back onto the lines.Note: The motor itself does not need to be grounded.Noise can couple outside the motor casewhen using a plastic end cap.A metal end cap works as a shield to contain thenoise within the motor case.Improved

X2Y Motor Application NotesGUIDELINE 5. continuedNote the improved suppression results after applying a metalized end cap.X2Y 1410 0.44uF

X2Y Motor Application NotesGUIDELINE 6.For best attachment of the X2Y component, power leads shouldexit the motor housing in close proximity to each other.ORPoor DesignImprovedImproved

X2Y Motor Application NotesGUIDELINE 7.The X2Y device is most effective when placed at the inside or outside of themetalized housing where the wires exit the motor. The X2Y componentis the last device the noise should pass through when leaving the motor.X2YX2YOr

X2Y Motor Application NotesGUIDELINE 7. (continued)Here are the test results when guideline 7 is applied. In this example the X2Ycomponent is placed inside of the housing and between the leads as the leadsexit the housing. Not that noise cancellation is near total as the X2Y resultsfollow the ambient in this emission test.ConductedEmissionsX2Y 1410 0.44uF

X2Y Motor Application NotesGUIDELINE 8.There should be a low inductive (at high frequency) attachment of the leads tothe component terminals. Note that the traces to the component are wide (lowinductance) and then narrow down when attached to the ground terminations.Solder BraidMotor housing(-) LeadAG1B(+) LeadG2Trace is connected tomotor housing

X2Y Motor Application NotesGUIDELINE 8. (continued)“G1 & G2” on the X2Y device must be connected to the same low impedance trace.A continuous trace between the “G1 & G2” terminations of the component reducesattachment inductance. When the trace is continuous, it is in parallel to the internalground electrodes of the component and impedance to ground (or the motor case)is lowered.G1Motor housingAB(+)Lead(-)LeadG2Continuous trace for G1 & G2connection and grounding tomotor case.

X2Y Motor Application NotesGUIDLINE 8. (continued)When there are long thin leads to the G1 and G2 terminations of the X2Ycomponent, noise is prevented from canceling on the motor case because theinductance associated with the leads is high impedance to ground (or motorcase). A general rule of thumb is to keep lead length less than ¼” long.Noise is prevented from getting toThe motor case for cancellation= NoiseABMotor Case

X2Y Motor Application NotesGUIDLINE 8. (continued)Conversely, if the traces to the A & B terminations of the component are too longor thin, the inductance associated with the leads is a high impedance to the X2Ycomponent. This prevents noise from getting to the component so that it can becancelled to ground or the motor case. A general rule of thumb is to keep leadlength less than ¼” long.Noise is blocked from getting to thecomponent for cancellation= NoiseG1BMotor CaseContinuous low impedance trace

X2Y Motor Application NotesGUIDLINE 9.When filter application is difficult because of lead locations or attachmentconstraints, brush card holders can offer a quick and universal solution forApplying the X2Y components.3 Brush Motor Filter, Insulated Metal ...Bottom SurfaceVIARotorTop SurfaceViaAX2YConnectorABBVia'sX2Y FilterConnectorMountingHolesSolderVia'sConnectorInsulationX2YSection AAVia'sViaSection BBSolder Metal SolderConductorSection AAX2Y Attenuators,LLC. 3 Brush Solid Core Carrier October 30, 2000 Issue 2 Drawing # 2131

X2Y Motor Application NotesGUIDLINE 9. (continued)Brush Card DesignTwo Speed Motor Attachment for X2YLow SpeedGroundG1 & G2 eachConnected to Ground TraceBrush CardInsulationConductor / TraceX2YHigh SpeedJumper Wire forBrush Connection.Riveted to Case GroundRiveted to Case GroundGround Trace / AreaScrew to Case GroundMotor CaseNote: (1) The "White" conductor / trace on brush card could be changed to jumper wire and then adding additionalground area as indicated above with the dashed line.2331, 2 Speed Motor with X2Y Circuit, Issue 1, 10-30-2000

X2Y Motor Application NotesGUIDLINE 9. (continued)Brush Card DesignMotor ConnectionsX2YX2YX2YPerimeter GroundRotorBrush Cardwith Rotor PenetrationConductive MaterialBrush Cardwithout Rotor PenetrationNotes:(1) Can use 1 or 2 X2Y devices as required to meet specific filtering needs.(2) Material recomendations are:A) Plated or metalized PlasticB) Insulated Metal(3) Symmetry and Balance are very important.X2Y RPatent PendingX2Y Attenuators, LLC.Drawing # 2393Brush Card IdeasIssue 0, 10-22-2000

X2Y Motor Application NotesGUIDLINE 9. (continued)Brush Card DesignHigh FrequencyFilterVIAVia's Plated Thru HolesA5000pfConnectorAA0.47ufConnectorARotorTop SurfaceInsulatorMountingHolesConductiveSurfaceBottom SurfaceLow FrequencyFilterVia'sHigh FrequencyFilterX2YSection AAConnectorSolder or WeldBrushSection AAX2YLow FrequencyFilterX2Y Attenuators, LLCThree Brush Motor FilterScale: NTS Drawing #2126Date:10-30-2000 Drawn by: KWMIssue: 5

X2Y Motor Application NotesGUIDLINE 9. (continued)Brush Card DesignBottom ViewProprietary X2Y DrawingInternal LayerMountingHoleVia'sConductiveTraceConductorTop ViewVia'sConductiveTraceconnectorA A A AconnectorAconnectorAMountingHoleInsulatorVia'sX2Y FilterPerimeterGroundConductiveTraceX2Y FilterSide ViewNote: Preferred Connector MaterialConductive MetalCross SectionView AAX2Y Attenuators,LLC.Connector Face3 Brush Filter Carrier, multi-level PCBIssue 1October 30, 2000Drawing # 2132

X2Y Motor Application NotesOther Considerations:A 1410 0.4 u F X2Y in X7R can handle approx. 1 ½ to 2A (depending onfrequency) of RF energy before breakdown. Higher levels of RF energymay need a larger X2Y device or the RF may have to be clamped to alower level with a diode or Zener diode.X2Y

X2Y Motor Application NotesOther Considerations:It is important that there is no paint or oil when you make groundconnection to the motor case, this will produce a poor groundat high frequencies.There should be a goodclean contact for a lowimpedance high frequencyground connection

X2Y Motor Application NotesOther Considerations: Holes or slots in the motor case can radiateenergy leading to component ineffectiveness. Keep the vent holesaway from the brushes (noise source).