Method for operating a brushless direct current motor
AssigneesConti Temic microelectronic GmbH, DaimlerChrysler AG
InventorsHans-Peter Feustel, Reinhard Orthmann
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Abstract
The invention relates to a brushless direct current motor with a synchronous motor, which is supplied with a direct current voltage as the input voltage for commutating the motor phases. The speed of the synchronous motor is modified or varied in two speed ranges. In the first speed range, a linear change of the input voltage is carried out up to a speed threshold value. In the second speed range with higher speeds than in the first speed range, a vector modification of the input voltage is carried out, for example for controlling the speed of a fan motor.
Claims9
Method for operating a brushless d.c.-motor (1) with a synchronous motor (10) which is supplied with a d.c. voltage as an input voltage (UE) for commutating the motor phase windings, characterized by performing a linear closed loop control of the input voltage (UE) in a first r.p.m.-range (12) up to an r.p.m.-threshold value (nS) for varying the r.p.m. (nM) of the synchronous motor (10), and, starting with the r.p.m.-threshold value (nS), performing a vector closed loop control of the input voltage (UE), in a second r.p.m.-range (13) having a higher r.p.m. (nM) and following said first r.p.m.-range (12) of the synchronous motor (10).
Dependencies are inferred from the claim text.