PWM transconductance brushless servo amplifiers

MFM Technology, Inc.0 and BDC 4000 from <%=company%> are PWM transconductance brushless servo amplifiers that accept and analog ±10 volt command signal. The amplifiers will drive a three phase WYE or DELTA wound brushless DC motor. They can be configured to command motorcurrent (transconductor mode) or motor speed (using an on-board closed loop velocity control circuit).

They have internal regulated supplies to create all DC voltages. The output stage is a high efficiency, 20 kHz pulse width modulated (PWM) power FET or IGBT-based amplifier. The BDC 300 and 4000 are available in two configurations: six step (trapezoidal) or sine wave drive. The amplifier powers the encoder, receives the A, B and Index signals, and supplies them to the host system.

The sine wave drive is available as either encoder (together with Hall commutation signals) or resolver-based. Both of these feedback methods provide information for communication, shaft velocity, and position and the generation of sinusoidal, three-phase current.

A resolver-based version is also available that has an emulated 1024 PPR encoder feedback signal (A, B and Index) instead of the 12 bit output.

200 13th Ave., Ronkonkoma, NY 11779 Tel: 516-467-5151 or 800-MFMOTOR Fax: 516-467-5176