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Many motors are not capable of operating continuously at 100% continuous torque at low frequencies. Each motor must be evaluated before selecting it for use on an AC drive. * Torque may be higher than 150% if the drive is capable of higher current. 39 Basic AC Drives AC drives, inverters, and adjustable frequency drives are all terms that are used to refer to equipment designed to control the speed of an AC motor. The term SIMOVERT is used by Siemens to identify a SIemens MOtor inVERTer (AC drive).

The amount of time required to stop a motor depends on the inertia of the motor and connected load. The more inertia the longer it will take to stop. 64 DC injection braking The DC injection braking mode stops the rotating magnetic field and applies a constant DC voltage to the motor windings, helping stop the motor. Up to 250% of the motor’s rated current can be applied. This is similar to removing your foot from the accelerator and applying the brakes to bring the car to a stop quickly. Compound braking Compound braking uses a combination of the controlled deceleration ramp and DC injection braking.

Various devices can be used such as thyristors, bipolar transistors, MOSFETS, and IGBTs. The following schematic shows an inverter that utilizes bipolar transistors. Control logic (not shown) uses a microprocessor to switch the transistors on and off providing a variable voltage and frequency to the motor. Converter DC Link Inverter L1 SCR Transistor L1 L2 C1 L3 3Ø Motor This type of switching is often referred to as six-step because it takes six 60° steps to complete one 360° cycle. Although the motor prefers a smooth sine wave, a six-step output can be satisfactorily used.

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Basics of AC Drives(en)(104s)


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