Detection of position of rotor in brushless dc motor

Details Detection of position of rotor in brushless dc motor Detection of position of rotor in brushless dc motor

1992-10-22

1993-10-19

Wysocki, Jonathan

Electricity: motive power systems

Automatic and/or with time-delay means

Movement, position, or limit-of-travel

318254, H02P 700

Patent

active

052549186

ABSTRACT:
A brushless dc motor includes a rotor and a stator. The stator has polyphase stator windings. The stator windings have first ends and second ends. The first ends of the stator windings are connected to each other at a common junction. The second ends of the stator windings are separate from each other. When the rotor is stationary, a detection is made as to a position of the rotor by the following processes. Test currents are fed to the stator windings via the second ends sequentially in different current-feed patterns. Voltages are detected which occur at the common junction in correspondence with the current-feed patterns respectively. A position of the rotor relative to the stator is detected in response to the detected voltages at the common junction.

REFERENCES:
patent: 4460859 (1984-07-01), Remus et al.
patent: 4678973 (1987-07-01), Elliott et al.
patent: 4752724 (1988-06-01), Radziwill et al.
patent: 4868467 (1989-09-01), Davis
patent: 4876491 (1989-10-01), Squires et al.
patent: 4992710 (1991-02-01), Cassat

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