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Measuring Armature Circuit Resistance in a PMDC Motor

Measuring Armature Circuit Resistance in a PMDC Motor

Application Notes & Gearmotor Tips: When a permanent magnet DC (PMDC) motor fails to operate properly, or fails to run at all, one sensible troubleshooting step is to measure the winding resistance to determine if there’s an open circuit or a short circuit, either between turns of the same winding, between two windings in the

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What does IR Compensation mean, and what is it used for?

What does IR Compensation mean, and what is it used for?

The IR compensation method is used to provide the speed regulation in our DC motor speed controls. When the load of a PMDC motor increases, the amount of current that the motor draws also increases. Per the performance characteristics of permanent magnet DC (PMDC) motors, an increase in load will cause a decrease in speed, because

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What is an AC Torque Motor? When do I use one?

What is an AC Torque Motor? When do I use one?

Bodine Electric offers AC induction motors that are impedance protected – we call these types of motors AC Torque Motors. These motors are ideal for tensioning applications because they can operate in stall mode without overheating. Torque motors feature: Higher starting torque at lower speed and lower running torque. What does “impedance protection” mean? It

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Load Testing with Gearmotors -- Know Your Current, Know Your Load

Load Testing with Gearmotors — Know Your Current, Know Your Load

Load Testing a Drive Application with a Brushless DC Gearmotor and Control By Eman Elashye When designing a new piece of equipment that uses motors or gearmotors, design engineers must calculate how much motor torque will be needed to drive their application load. If the gearmotor or motor is undersized and too small, the product

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Considerations for Traction Motor Applications -- AC, BLDC or PMDC Motors

Considerations for Traction Motor Applications — AC, BLDC or PMDC Motors

A ”traction motor” is a motor or gearmotor used in a traction application. Golf carts, electric vehicles, locomotives, lift trucks, etc. Often “traction motors” also have mounting features, temperature sensors, wiring terminals that are useful in mounting the motors in a vehicle. They may also have a higher level of environmental protection against dust

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What is a Sensorless Brushless DC Control? How does it work?

What is a Sensorless Brushless DC Control? How does it work?

A sensorless brushless DC control consists of a power supply, a power stage, commutation logic, and startup logic. The key difference to an electronically commutated BLDC motor system is that the Hall sensor inputs are replaced by a system that measures generated voltage (BEMF = back EMF) and uses zero crossings to determine when to

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Application Tips: Troubleshooting a Brushless DC (ECM) Motor and Control System

Application Tips: Troubleshooting a Brushless DC (ECM) Motor and Control System

One of our authorized distributors called our Tech Support staff in Chicago recently because his customer was having problems with a Bodine 34B4BEBL brushless DC motor and our ABL-3911 control. Our products were designed into a new machine that is used to induction-harden steel shafts. 1) Because of the distance between the motor and the control, the

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“Hotrodding” AC Capacitor Motors and Gearmotors …At your own Risk

You can get higher starting torque from an AC induction motor by replacing factory specified capacitors with larger ones. But pushing the motor too far beyond design specs is risky. Here’s how capacitance affects motor performance. Overview Capacitors for permanent-split-capacitor (PSC) and capacitor-start (CS) AC induction motors are sized by motor manufacturers to produce

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Professor Shahidehpour Named IIT’s Bodine Chair in Electrical and Computer Engineering

Professor Shahidehpour Named IIT’s Bodine Chair in Electrical and Computer Engineering

The Illinois Institute of Technology (IIT) has appointed Mohammad Shahidehpour to the Carl and Paul Bodine Endowed Chair in Electrical and Computer engineering. Dr. Shahidehpour has been a faculty member at IIT for the past 25 years, with expertise in large-scale power systems, non-linear stochastic systems and optimization theory. He has written more than 300

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Peak or Obtainable Torque from small (FHP) Gearmotors and Motors

Peak or Obtainable Torque from small (FHP) Gearmotors and Motors

It can get confusing when we discuss “Peak” or “Obtainable” torque for small (fractional HP = less than 1HP/746W) gearmotors and motors because terminology and definitions sometimes change between AC and DC motors, gearmotors, or when a motor speed control is used. AC Motors: in non-synchronous AC induction motors, we define obtainable torque as breakdown torque.

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