http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CA-1301240-C
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c72d118f5664072de841f9c5c34b9d99 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H02P6-00 |
| filingDate | 1989-09-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1992-05-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_5f96a35cb8a31b9d015afbd0134bc290 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_af6ef4e20c0f480336f4476698b3017d http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_59fc7739e62179039e9f5aab04fa813a |
| publicationDate | 1992-05-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CA-1301240-C |
| titleOfInvention | Control circuits, electronically commutated motor systems and methods |
| abstract | PATENT CONTROL CIRCUITS, ELECTRONICALLY COMMUTATED MOTOR SYSTEMS AND METHODS Abstract Control circuit for an electronically commutated motor which has a rotatable assembly and further has a stationary assembly with a plurality of winding stages having terminals for energization, and switches for apply-ing a voltage to one or more of the terminals of the wind-ing stages at a time and commutating the winding stages in a preselected sequence to rotate the rotatable assembly. A preselected sequence of winding stages are left correspond-ingly unpowered so that a plurality of the winding stages are unpowered at some time. The winding stages generate back emf signals and also couple electrical signals from each energized winding stage to the unpowered winding stages which signals can interfere with detection of back emf for position sensing purposes. The control circuit includes a first circuit for selecting at least two of the unpowered winding stages which have electrical signals coupled to them that have a predetermined relationship in polarity and magnitude. A second circuit produces an elec-trical output from the voltages on the winding stage ter-minals of the winding stages selected, so that the electri-cal signals coupled from each energized winding stage are substantially canceled when they have the predetermined relationship while the back emf is preserved for position sensing substantially free from interference from the elec-trical signals that are coupled from each energized winding stage to the unpowered winding stages. Other control cir-cuits, electronically commutated motor systems and methods of control and operation are also disclosed. |
| priorityDate | 1989-09-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
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