| Abstract |
Idle speed of PM BLDC motor supplied from
half-bridge-structure electronic commutator is twice as high
as idle speed of the same motor supplied from bridgestructure
electronic commutator. This drive characteristic
has been used to extend PM BLDC motor speed range.
Putting additional three diodes, one fully-controlled
electronic valve such as MOSFET transistor and capacitor
buffer [2], [3], [4] into half-bridge commutator, a variablestructure
commutator has been constructed, which makes
possible doubling motor speed range. The diode in current
flow path does not allow current to flow back into the
supply source. This circuit does not, therefore, make
recuperative braking possible. However, it has been proved
in the paper that with adequate control algorithm applied to
the bridge elements, it is possible to achieve recuperative
braking both in the range of speeds corresponding to halfbridge
structure and full-bridge structure of electronic commutator. |
