AC servo drive

Baldor’s new MicroFlex brushless AC servo drive features space vector modulation as well as a synchronous serial interface.

Baldor’s new MicroFlex brushless AC servo drive features space vector modulation (SVM) as well as a synchronous serial interface (SSI) and incremental encoder feedback interfaces.

By controlling the IGBT power devices using SVM instead of the more usual carrier based pulse width modulation (PWM), users get reduced switching losses and harmonics, while SSI feedback provides absolute positional data on every servo loop.

The MicroFlex servo drive also supports trapezoidal commutation, in addition to sinusoidal commutation, allowing OEMs to employ an encoderless motor control loop.

Baldor MicroFlex brushless AC servo drives are available in three power ratings of 3, 6 and 9A – with 200% peak current capability. They will run from single or three phase supplies from 115 to 230VAC, making it possible to fit one standard motion control system into machinery for international markets.

MicroFlex products may be configured as either a torque or velocity reference using the standard ±10V input command signal. For closed loop feedback packages, encoder, SSI or Hall sensors are supported. A step and direction interface is also supplied, making MicroFlex an ideal upgrade or replacement for stepper-based packages.

MicroFlex is a fully protected unit, and includes encoder loss detection, overcurrent, overvoltage, and overtemperature protection. With the addition of an external dumping resistor, regenerative braking energy can be dissipated.

Drives are configured for applications using Baldor’s Windows software environment, Mint WorkBench, which includes an autotuning tool to help users install the drive.

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