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 windingInfo
- 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
Links
Landscapes
- 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.
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) |
-
1998
- 1998-02-05 NZ NZ337029A patent/NZ337029A/en not_active IP Right Cessation
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
RENW | Renewal (renewal fees accepted) | ||
RENW | Renewal (renewal fees accepted) | ||
RENW | Renewal (renewal fees accepted) | ||
RENW | Renewal (renewal fees accepted) | ||
EXPY | Patent expired |