NZ337029A - Control of brushless DC motor, switching controlled by sensing duration of back EMF pulse in unpowered winding - Google Patents

Control of brushless DC motor, switching controlled by sensing duration of back EMF pulse in unpowered winding

Info

Publication number
NZ337029A
NZ337029A NZ337029A NZ33702998A NZ337029A NZ 337029 A NZ337029 A NZ 337029A NZ 337029 A NZ337029 A NZ 337029A NZ 33702998 A NZ33702998 A NZ 33702998A NZ 337029 A NZ337029 A NZ 337029A
Authority
NZ
New Zealand
Prior art keywords
pulse
control
winding
current
back emf
Prior art date
Application number
NZ337029A
Inventor
John H Boyd
Gerald Duncan
Michael Thomas George Perry
Original Assignee
Fisher & Paykel
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fisher & Paykel filed Critical Fisher & Paykel
Priority to NZ337029A priority Critical patent/NZ337029A/en
Priority claimed from PCT/NZ1998/000012 external-priority patent/WO1998035428A1/en
Publication of NZ337029A publication Critical patent/NZ337029A/en

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  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

control system for electronically commutated brushless DC motors of the type where at any instant one winding is unpowered and where the zero-crossings of the back EMF (BEMF) induced in the unpowered winding is used to control winding commutations is disclosed. In such motors, a current pulse CP is produced in the windings when the current is cut off by the commutation device, the energy of this pulse being dissipated in freewheel diodes in parallel with the commutation device. The duration of this pulse is measured and used to provide a measure of motor current. The measured pulse duration is compared with a stored maximum value so as to adjust the duty cycle of the pulse width modulation signal used to control the current in the stator windings.
NZ337029A 1997-02-05 1998-02-05 Control of brushless DC motor, switching controlled by sensing duration of back EMF pulse in unpowered winding NZ337029A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NZ337029A NZ337029A (en) 1997-02-05 1998-02-05 Control of brushless DC motor, switching controlled by sensing duration of back EMF pulse in unpowered winding

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NZ31419597 1997-02-05
NZ337029A NZ337029A (en) 1997-02-05 1998-02-05 Control of brushless DC motor, switching controlled by sensing duration of back EMF pulse in unpowered winding
PCT/NZ1998/000012 WO1998035428A1 (en) 1997-02-05 1998-02-05 Brushless dc motor control

Publications (1)

Publication Number Publication Date
NZ337029A true NZ337029A (en) 2000-01-28

Family

ID=26651743

Family Applications (1)

Application Number Title Priority Date Filing Date
NZ337029A NZ337029A (en) 1997-02-05 1998-02-05 Control of brushless DC motor, switching controlled by sensing duration of back EMF pulse in unpowered winding

Country Status (1)

Country Link
NZ (1) NZ337029A (en)

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