Method for controlling the torque of a synchronous machine suppl

Electricity: motive power systems – Synchronous motor systems – Armature winding circuits

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

318800, H02P 540

Patent

active

049203061

ABSTRACT:
This invention relates to a method for controlling the torque of a synchronous machine supplied by a frequency converter, wherein starting from measured variables (i.sub.R, i.sub.S, i.sub.T, i.sub.f) representing the state of the machine the direct axis flux component (.psi..sub.d), the quadrature axis flux component (.psi..sub.q) and the pole angle (.delta.) for the machine are determined, and set values are produced for the flux (.psi. set value), excitation current (i.sub.fo set value) and current building the torque (i.sub.2 set value). To prevent the "pull out" of the drive in the method of the invention, from the determined pole angle (.delta.) there is formed, by means of a limiting block for the pole angle, a limited pole angle (.delta..sub.r) that equals the pole angle (.delta.) if the pole angle has an absolute value smaller than a separately adjustable limit (.delta..sub.max), but equals the limit (.delta..sub.max) if the pole angle has an absolute value equal to or greater than the limit (.delta..sub.max), the set value (i.sub.2 set value) of the current building the torque, being perpendicular to the direction forming the limited pole angle (.delta..sub.r) with the direct axis (d) of the rotor, is projected as the set value (i.sub.do set value) for the direct stator current and as the set value for the quadrature stator current (i.sub.qo set value) and for maintaining the direct flux (.psi..sub.d) at a value corresponding to the limited pole angle (.delta..sub.r) and the flux set value (.psi. set value), the set value (i.sub.fo set value) for the excitation current is calculated on the basis of the limited pole angle (.delta..sub.r), the flux set value (.psi.set value) and the set value for the direct stator current (i.sub.do set value) so that the set value for the excitation current (i.sub.fo set value) compensates for the direct stator set value (i.sub.do set value).

REFERENCES:
patent: 4649331 (1987-03-01), Janns
patent: 4792741 (1988-12-01), Matsuo et al.
Leonhard, W, Control of Electrical Drives, Springer-Verlag, 1985, pp. 261-270.
Mard, M.; Control Laws of Electric Machines; IFAC Control in Power Electronics and Electrical Drives; Lausanne, Switzerland; pp. 33-40 (1981).

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Method for controlling the torque of a synchronous machine suppl does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for controlling the torque of a synchronous machine suppl, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for controlling the torque of a synchronous machine suppl will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-36029

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.