Variable speed AC drive control

Details Variable speed AC drive control Variable speed AC drive control

1993-08-16

1995-03-28

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318807, 363160, 363165, H02P 528

Patent

active

054020549

ABSTRACT:
A method for controlling the speed of an AC machine (12) is described.
The AC machine (12) receives three output phases (A,B,C) supplied from a cycloconverter (10) which is connected to an input supply (R,Y,B) of frequency f.sub.1. The cycloconverter (10) is caused to operate in three modes under control of a microprocessor (25).
The first mode supplies the AC machine (12) in the frequency range 0 to f.sub.0, by conventional cycloconverting to generate a near continuum of frequencies.
The second mode operates the cycloconverter (10) to synthesize a number of frequency steps in the frequency range f.sub.0 to f.sub.1 from the input supply (R,Y,B) and provides speed control of the AC machine (12) by phase control of the output voltage (A,B,C) between each frequency step.
The third mode operates the cyclonverter (10) to be transparent, such that the input frequency f.sub.1 is effectively directly supplied to the AC machine (12) without speed regulation being applied.

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