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Routine Maintenance on AC Inverters (.pdf)
, the development of power semiconductors and micro-. processors has brought efficient adjustable speed control to AC motors. through the use of inverter drives. Through this technology, the most. recent designs of so-called pulse width modulated AC drives are capable. of speed and torque regulation
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MICRO: Products
preparation, scanning, and multisampling are fully automatic. Fan/Filter Unit. Airguard. Louisville, KY. The MicroPleat EC programmable fan/filter unit has an electronically commutated dc motor that runs off ac power. The unit offers substantial energy savings because its electronics package
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Understanding Electronic Motor Drives
drive controls the speed, torque, direction, and resulting horsepower of a motor. Dc drives typically control a shunt-wound dc motor, which has separate armature and field circuits. Ac drives control ac-induction motors and, like their dc counterparts, control speed, torque, and horsepower
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Shaft grounding for inverter driven motors
solution to the problem. Shaft grounding for inverter driven motors_eng.indd Shaft grounding for inverter driven motors. The use of variable-frequency drives (VFDs) to con-. Shaft currents induced by VFDs can lead to motor fail-. trol AC motors has increased dramatically in recent. ures. Without
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Micro-Dispensing Liquid Pump
, and an operational lifetime of up to 1 billion cycles. The Case for Dedicated Laboratory Vacuum Systems. Micro-Dispensing Pump. Al Presher, Contributing Editor, Design News Magazine. New liquid dispensing pump technology that uses a solenoid rather than a dc motor precisely delivers fluids up to 20 times per second
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Brushless DC Motor Control Using PIC18FXX31 MCUs
A PICDEMTM MC demo board was used to develop, test and debug the motor control code. The PICDEM MC has a single-phase diode bridge rectifier, converting AC input to DC and a power capacitor bank that keeps a stable DC bus. A 3-phase IGBT-based inverter bridge is used to control the output voltage
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MICRO: Product Technology News (January 2001)
and a digital output for direct interfacing with the manufacturer's multiplexing software. The monitor can detect very-low-level reference ground problems, with sensitivity below 50 mV. It also detects ac spikes and complete ground loss. The response speed is 3 nanoseconds, and accuracy is +-1 The Solo
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VF Control of 3-Phase Induction Motors Using PIC16F7X7 Microcontrollers
PWM modules, making them. results in the reduction of torque. Above the base. suitable for 3-phase motor control applications. This. speed, the factors governing torque become. application note explains how these microcontrollers. complex. can be used for 3-phase AC induction motor control