Electricity: motive power systems – Synchronous motor systems – Synchronization systems
Reexamination Certificate
1999-10-14
2001-03-13
Ip, Paul (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Synchronization systems
C318S254100, C318S720000, C318S721000, C318S722000, C318S723000, C318S724000
Reexamination Certificate
active
06201367
ABSTRACT:
The invention relates to a method for restarting a synchronous permanent magnet motor still rotating and connected to a drive unit with a variable output AC voltage.
In particularly, the invention concerns a method for resuming operation of a 3-phase synchronous permanent magnetic motor by phasing-in the variable output drive unit relative to the actual speed and rotational angle of the motor rotor, wherein the drive unit has a DC-link with a voltage measuring means and current measuring means on at least two of the output phases.
In prior art technique, phasing-in of a drive unit in relation to the actual speed and position of a rotating motor has been performed by using a voltage sensing and measuring device connected to the three output stage outputs. This device complicates the drive unit unnecessarily, and since it is desirable to make the drive unit simpler, more reliable and less expensive it is an object of the invention to provide a drive unit having the same functional features without including this voltage sensing and measuring device.
A preferred application example of the invention is described below in further detail with reference to the accompanying drawings.
REFERENCES:
patent: 4829416 (1989-05-01), Inaba et al.
patent: 5488281 (1996-01-01), Unsworth et al.
patent: 5565753 (1996-10-01), Chen et al.
patent: 5914582 (1999-06-01), Takamoto et al.
patent: 6002234 (1999-12-01), Ohm et al.
Atlas Copco Controls AB
Frishauf, Holtz Goodman, Langer & Chick, P.C.
Ip Paul
Leykin Rita
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