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IR Drop Compensation Adjustment

 

 
Although a typical DC motor presents a mostly inductive load, there is always a small amount of fixed resistance in the armature circuit. The armature, intercoil, series field, brushes, wiring between motor and controller, etc., comprise the armature circuit resistance. Typical resistance values might be .25 Ohm at 100 HP, 1.5 Ohm at 25 HP, and increase as the horsepower goes down. Since 'I' represents current (amps) and 'R' stands for the amount of resistance (Ohms), we can multiply the two numbers to get the IR drop of any motor. Typical values of IR drop for RPM III motors range between approximately 5-10% of rated voltage (25-50 V on 500 V motors or 12-24 V on 240 V motors) at rated horsepower. IR drop compensation is an adjustment feature of most Reliance Electric VHS DC drives that largely compensates for the armature
Products & Services
Computer fans are used to cool computers and their associated components. They blow air into or out of computers and onto computer components in order to keep hardware at the correct operating temperature. Learn more about Computer Fans
Analog voltmeters are instruments that measure voltage or voltage drop in a circuit. They display values on a dial, usually with a needle or moving pointer. Search by Specification | Learn more about Analog Voltmeters
Motor contactors are relays with large current capacity for connecting and disconnecting a motor from the power supply. Typically, motor contractors are multi-pole for control of all current carrying conductors. Search by Specification | Learn more about Motor Contactors
DC servomotors are generally small and powerful for their size, and easy to control. Common types of DC servomotors include brushless or gear motors. Search by Specification | Learn more about DC Servomotors
Linear motors generate force only in the direction of travel. They are capable of extremely high speeds, quick acceleration, and accurate positioning. Search by Specification | Learn more about Linear Motors
Product Announcements
Automationdirect.com - Motor Control-Starters/Contactors/Overloads/Relays
Motor contactors,relays, & manual motor starters provide complete motor control solutions up to 300 Hp. Starters accommodate motors up to 100 Hp at 480 VAC, while MMS combination starters... (read more)
Vitrek Corporation - Hipot-Insulation Resistance-Ground Bond Testers
The GPT/GPI-800 Electrical Safety Testers (EST) are Hipot Testers designed for AC/DC Withstanding Voltage testing and Insulation Resistance (IR) testing to provide electrical safety compliance testing... (read more)
Baker Instrument Company, an SKF Group Company - WINTATS8800 Automatic Winding Test System
The WinTATS Traction Armature Test System is a field proven and rugged system for testing armatures. It combines the most common process electrical tests into one automated instrument. HiPot, Surge... (read more)
Swiger Coil Systems, Inc. - Armature Coils - OEM & Motor / Generator Services
Swiger Coil Systems™ takes pride in the over 30 years of excellence that they have provided quality armature coils. Their ISO... (read more)
Swiger Coil Systems, Inc. - Armature Coils for Motors and Generators
Swiger Coil Systems™ takes pride in the over 30 years of excellence that they have provided quality armature coils. Their ISO 9001:2000 certification.... (read more)
Swiger Coil Systems, Inc. - Armature Coils for Motors & Generators
Swiger Coil Systems takes pride in over 30 years of excellence that they have provided quality armature coils. Their... (read more)
Automationdirect.com - NEW: NEMA Premium AC Motors
AutomationDirect offers a variety of AC motors from ¼-100 Hp. New models offer premium efficiency from 1-100 Hp. These TEFC motors meet or exceed NEMA Premium ratings for reduced power consumption... (read more)
ThinGap LLC - ThingGap's TGB1612 Brush Motor
Custom brush motors and part sets are available using newly developed designs or we can configure standard motor designs to achieve a wide range of efficiencies, speed, torque and horsepower. These... (read more)
ThinGap LLC - ThinGap's TGB1710 Brush Motor
Custom brush motors and part sets are available using newly developed designs or we can configure standard motor designs to achieve a wide range of efficiencies, speed, torque and horsepower. These... (read more)
ThinGap LLC - ThinGap's TGB2020 Brush Motor
Custom brush motors and part sets are available using newly developed designs or we can configure standard motor designs to achieve a wide range of efficiencies, speed, torque and horsepower. These... (read more)
Topics of Interest
Occasionally, a customer may request to know the stopping time for DB on our single and three-phase DC drives. Stopping time can be easily estimated applying the following formula: T = (2 (RPM)2 x WR2... (Read More)
AC and DC motors are the two major types in use today that are related to the industrial and HVAC applications. These motors provide the speed, torque, and horsepower necessary to operate the... (Read More)
Introduction Basically, four different types of DC motors are used in industrial applications: series wound, shunt wound, compound wound, and permanent magnet. Several factors must be considered when... (Read More)
TRANSIENT BEHAVIOUR CURRENT SURGES It has already been pointed out that the steady-state armature current depends on the small difference between the back e.m.f. E and the applied voltage V. In a... (Read More)
TYPES OF CONTROLS In order to use an electric motor to drive a pump, a means of starting and stopping the motor is required. The devices used for this purpose can be called controls. Only small -... (Read More)
See more product announcements for Computer Fans
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