|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||388/811 ; 318/798 ; 318/800 ; 318/811 ; 318/599 ; 388/928|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 34 인용 특허 : 8|
The speed of a rotor in a two-winding, permanent magnet motor can be accurately controlled with a dual-polarity pulse width modulation drive signal. The phase back emf signal generated in the non-excited winding is compared against the phase of a command signal and the results of the comparison are used to vary the duty cycle of the drive signal.
[ What is claimed is:] [1.] An apparatus for driving a two winding permanent magnet motor in response to a command signal, comprising:means for generating an alternating-polarity, variable duty-cycle, pulse width modulated drive signal for one of the windings,means for sensing the back-emf generated in the other of the windings, andmeans, responsive to the command signal and the means for sensing the back-emf, for varying the duty cycle of the drive signal, said means for varying the duty cycle comprisingmeans for comparing the relative phases of the com...