Power Quality Magnetics & Complementary Assemblies

AMP Magnetics is an independent manufacturer’s representative for domestic producers of specialized power quality magnetics and complementary OEM sub-assemblies.

Independent Representative Notice: AMP Magnetics represents manufacturers of engineered electrical power products; AMP Magnetics does not manufacture, warehouse, or assemble these components. We provide application discovery, specification review, and drawing coordination directly with qualified manufacturing plants.
Complementary Magnetics & Packaging

Specialized Magnetic Assemblies for OEM Integration

In modern power conversion equipment—such as solar central inverters, battery storage bi-directional converters, and automated test stands—magnetic components frequently require tailored mechanical packaging, specialized bus bar connections, or integrated thermal sensors.

As a manufacturer’s representative, we work with OEM engineering groups to match specialized low-volume and medium-volume assemblies to manufacturing plants configured for custom sheet metal, bus bar fabrication, and precision coil winding.

Detuned PFC Reactors

Iron-core detuned filtering reactors connected in series with power factor correction capacitor banks. Prevents destructive parallel resonance between utility transformers and capacitor banks.

  • Detuning factors: 5.67%, 7%, 14%
  • Copper and aluminum wound options
  • Integrated thermal NC microswitches

Sine Wave Output Filters

Precision LC filter combinations that convert pulse-width modulated (PWM) voltage waveforms into near-perfect sinusoidal output for standard AC motors and submersible pumps.

  • Reduces motor dV/dt stress to < 15V/μs
  • Allows cable runs in excess of 1,500+ feet
  • Eliminates high-frequency motor bearing currents

Engineered Sub-Assemblies

Pre-wired open-frame sub-assemblies and packaged NEMA enclosures containing transformers, line reactors, and pre-terminated terminal blocks for rapid OEM installation.

  • Custom enclosure dimensions
  • Pre-drilled mounting plates and lifting eyes
  • Factory-tested assemblies ready for panel drops
Sourcing Scope

Complementary OEM Component Capabilities

Component Scope Typical Ratings Environmental Packaging Typical Target Application
PFC Tuning Reactors 10 kvar to 200+ kvar per stage Open Core/Coil (IP00) for control panels Automated capacitor bank steps in automotive and metal plants.
Common-Mode Chokes 10A to 600A Toroidal and nanocrystalline cores EV fast charging stations and DC bus EMI suppression.
High-Frequency Inductors 10 kHz to 100 kHz operation Ferrite and powder core formulations Solar inverters, induction welding, and high-frequency power supplies.
Custom Integrated Magnetics Customer Specified NEMA 1, 3R, 4, 12, 4X Stainless Skid-mounted mining, marine, and oilfield electrical packages.
Honest Sourcing Scope: We represent manufacturers specializing in engineered magnetics and closely aligned power assemblies. We do not represent generic catalog distribution components, standard off-the-shelf wiring accessories, or consumer-grade hardware. If an inquiry falls outside our represented manufacturing partners' tooling, we will tell you directly on day one.

Have a Custom Electrical Packaging Requirement?

Send your preliminary layout drawing, single-line, or electrical parameters to our technical review team.

Submit Application Notes
Common Questions

Questions we get asked about Power Quality Magnetics

What causes motor bearing damage on VFD-driven motors?

PWM switching produces common-mode voltage that drives high-frequency current through parasitic capacitance, including through the motor bearings, where it causes electrical discharge machining pitting. Fluting on the bearing race is the diagnostic signature. Shaft grounding rings, insulated bearings, and electrostatically shielded isolation transformers all contribute to mitigation.

What is dv/dt and why does it matter?

It is the rate of rise of voltage in the PWM waveform. Fast IGBT switching combined with a long motor cable causes the voltage step to reflect at the motor terminals, producing peaks approaching twice the DC bus voltage — around 1,300 volts on a 480 volt system. That stress concentrates on the first turns of the stator winding and erodes insulation.

Will lowering the drive carrier frequency help?

Often yes, and it costs nothing to try before buying filtering. A lower carrier means fewer voltage pulses per second reaching the motor and less cumulative insulation stress. The trade-offs are increased motor audible noise and a small increase in motor heating.

Does a rewound motor keep its inverter-duty rating?

Not automatically. Unless the rewind used an equivalent inverter-grade insulation system, the motor may no longer meet NEMA MG1 Part 31 even though the nameplate is unchanged. This is a frequent and easily missed cause of repeat winding failures.