Custom Resistor Assemblies

(As a safety requirement, medium voltage motor drive systems are typically discharged with dedicated resistors. This assembly can be sized based on DC bus capacitance and specified motor drive shutdown time. In addition, the current capability of the shutdown relay and safe discharge are critical to the assembly design.)

For medium voltage motor drive systems, safety mandates dedicated discharge resistors. We size these assemblies precisely based on your DC bus capacitance and specified motor drive shutdown time. Crucially, we factor in the shutdown relay's current capability and ensure safe discharge for every design, guaranteeing system integrity and operator safety.

(Being able to accommodate high energy dissipation without risking a voltage spike across terminations is essential. The unique geometry of our 510AS slab resistor assembly allows for close spacing without compromising cooling. A compact solution is possible for 125 KJoule pulses, or greater, every 60 seconds.)

Our 510AS slab resistor assembly is engineered for superior high energy dissipation without risking dangerous voltage spikes. Its unique geometry allows for close spacing without compromising cooling, delivering a remarkably compact solution. This means you can handle 125 kJoule pulses, or greater, every 60 seconds, even in tight spaces.

(Problems can occur with large motor drive and power converter systems when the drive must handle the deceleration rate of the motor. Or when speeds exceed the synchronous speeds set by the output frequency of the drive. Both conditions create regenerated power which flows back into the drive and can cause DC Bus voltage to rise. To avoid shutdown due to over-voltage, this power can be dissipated into a braking (or chopper) washer resistor assembly. Crowbar washer resistor assemblies are also used to absorb very large energy pulses for emergency shutdown of wind turbine and transport power.)

Large motor drives and power converters face challenges when handling motor deceleration or exceeding synchronous speeds, causing regenerated power to flow back and spike DC Bus voltage. To prevent over-voltage shutdowns, this excess power must be safely dissipated.Ohmite's braking (or chopper) resistor assemblies are engineered for precisely this purpose. Our crowbar washer resistor assemblies also absorb massive energy pulses for emergency shutdowns in critical applications like wind turbines and transport power systems, ensuring safety and preventing costly damage.

(While standard slab resistors work well from an electrical standpoint, sometimes a more robust thermal and mechanical solution is needed. This assembly eliminates the risk of shock or vibration induced disconnections and contaminants altogether. A machined aluminum shell houses multiple slab or axial resistors either in series or in parallel. After encapsulation, the assembly is mounted on a liquid cooled heatsink which permits continuous power through the unit.)

While standard slab resistors have their place, demanding applications often require a superior thermal and mechanical solution. Our advanced encapsulated resistor assemblies eliminate the risk of shock, vibration-induced disconnections, and contaminants altogether. Each unit features multiple slab or axial resistors, precisely housed in a machined aluminum shell and arranged in series or parallel for optimal performance. After expert encapsulation, the assembly is mounted on a liquid-cooled heatsink, enabling continuous high power operation even in the most challenging environments.

(When studying particle physics in a contained environment, a great deal of energy must be efficiently controlled. Our slab assembly was submerged in oil to provide a safe way to dissipate the heat generated when powering the linear accelerators). 

In the challenging world of contained particle physics, efficiently controlling immense energy is paramount. Our specialized slab assemblies are engineered for precisely this, providing a safe and highly effective solution. By submerging these assemblies in oil, we create a robust system that safely dissipates the substantial heat generated during the powering of linear accelerators. This innovative approach ensures thermal stability and reliable operation even in the most demanding high-energy environments.

(Parallel tubular resistor assemblies provided an effective solution to replace a failed wire-wound resistor in an electrostatic precipitator application. The system can see a peak voltage of over 300kV and dissipate over 2 kW of power.)

When a wirewound resistor failed in a critical electrostatic precipitator, Ohmite's parallel tubular resistor assemblies stepped in with an incredibly effective solution. These robust assemblies are engineered to handle extreme conditions, effortlessly managing systems with peak voltages exceeding 300kV and reliably dissipating over 2 kW of power. It's a testament to their superior design and durability in demanding, high-voltage environments.