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AC Motors

What does motor insulation class specify and why is it important?

January 4, 2021 By Danielle Collins Leave a Comment

Any time current flows through a wire — such as the windings in a motor — resistance in the wire, as well as other losses, cause heat to be generated. This heat will eventually transfer to other parts of the motor, causing them to degrade over time. One of the key components affected by this […]

Filed Under: AC Motors, FAQs + basics, Featured, Gearmotors, Motors

What is inrush current in an AC motor and why does it matter?

December 22, 2020 By Danielle Collins Leave a Comment

inrush current

When an electrical device, such as an AC induction motor, is switched on, it experiences a very high, momentary surge of current, referred to as inrush current. When an AC induction motor is started, the supplied voltage creates a magnetic field in the stator, which induces a magnetic field in the rotor. The interaction of […]

Filed Under: AC Motors, FAQs + basics, Featured

What is a motor control center (MCC)?

December 14, 2020 By Danielle Collins Leave a Comment

motor control center

Manufacturing plants often contain dozen, if not hundreds, of motors — driving everything from packaging and processing equipment to fans and pumps. Motor control centers allow facilities such as these to centralize control of some or all of their motors into one location. The basic structure of a motor control center (MCC) is a metal cabinet […]

Filed Under: AC Motors, FAQs + basics, Featured

What are thermal overload relays and what motion components do they protect?

October 21, 2020 By Danielle Collins Leave a Comment

Heat is a major factor in the performance and life of a motor, and one of the primary sources of motor heating is current running through the motor windings. Since heating is an unavoidable condition of motor operation, it’s important to protect the motor from overheating, or thermal overload. In a previous post, we described […]

Filed Under: AC Motors, FAQs + basics, Featured, Sensors + Vision

What’s the difference between dynamic braking and regenerative braking?

October 15, 2020 By Danielle Collins Leave a Comment

regenerative braking

When a motor’s rotor speed is greater than its synchronous, or designated, speed, it can act as a generator, creating electrical energy from mechanical energy. This electrical energy needs somewhere to go, and there are two ways to deal with it — dissipate it as heat, or reuse it. Dynamic braking takes the energy generated […]

Filed Under: AC Motors, Drives + Supplies, FAQs + basics, Featured, Uncategorized

What are bearing currents and what causes them?

October 8, 2020 By Danielle Collins Leave a Comment

bearing currents

Pulse-width modulation is a fundamental operating principle of variable frequency drives (VFDs), but the high-frequency switching that delivers pulses of voltage from the drive to the motor can cause bearing currents — high-frequency currents that flow through the motor bearings, often leading to damage and premature failure. To achieve pulse-width modulation, insulated gate bipolar transistors (IGBTs) […]

Filed Under: AC Motors, Drives + Supplies, FAQs + basics, Featured, Uncategorized

What is cable ringing between AC drives and motors and how can it be avoided?

September 25, 2020 By Danielle Collins Leave a Comment

cable ringing

Variable frequency drives use a technique referred to as pulse-width modulation (PWM) to provide voltage of varying frequency to an AC induction motor. The inverter, or output, stage of the VFD uses insulated gate bipolar transistors (IGBTs) that switch on-and-off rapidly, creating trapezoidal pulses of varying width to simulate AC sinusoidal voltage. But the windings in […]

Filed Under: AC Motors, Drives + Supplies, FAQs + basics, Featured

What are drive isolation transformers and how do the differ from line reactors?

September 15, 2020 By Danielle Collins Leave a Comment

drive isolation transformers

A variable frequency drive alters the speed of an AC induction motor by rectifying incoming AC power to DC, storing the DC power in a bus, and then converting the DC power back to AC at the voltage and frequency required to meet the load demands. Although this matching of the motor speed to the […]

Filed Under: AC Motors, Drives + Supplies, FAQs + basics, Featured

Nippon Pulse introduces new high-resolution, high-torque miniature AC servomotors

September 1, 2020 By Kelsey Zebrowski Leave a Comment

Nippon Pulse America, Inc. is pleased to introduce its new series of high-performance micro direct-drive (MDD) AC servomotors. The new MDD motors will join Nippon Pulse’s existing line of Linear Shaft Motor servomotors. Each compact MDD motor comes with a built-in high-performance encoder (either absolute or incremental) that enables direct fine positioning. The motors are […]

Filed Under: AC Motors Tagged With: Nippon Pulse

What are power factor correction capacitors?

August 12, 2020 By Danielle Collins Leave a Comment

power factor correction capacitors

The measure of how efficiently a piece of equipment or facility uses power to produce work is known as its power factor. Although resistive loads, such as heating and lighting, have a high power factor, inductive loads, including AC induction motors, don’t use all of their supplied power to produce useful work, so their power […]

Filed Under: AC Motors, Drives + Supplies, FAQs + basics, Featured

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