Method and apparatus for driving and controlling synchronous motor using permanent magnets as its field system

When a rotational speed (N) of a synchronous motor (14) using permanent magnets as its field system is equal to or higher than a base rotational speed (NB), a current condition computing section (16) computes a field weakening reference current (Id*) in accordance with a battery voltage (Vdc), refer...

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Bibliographic Details
Main Authors YAMADA EIJI C O TOYOTA JIDOSHA, KAWABATA YASUTOMO C O TOYOTA J, KUSAKA YASUSHI C O TOYOTA JIDO
Format Patent
LanguageEnglish
French
German
Published 03.05.1995
Edition6
Subjects
ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES
ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL
MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES
PERFORMING OPERATIONS
TRANSPORTING
VEHICLES IN GENERAL
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Summary:When a rotational speed (N) of a synchronous motor (14) using permanent magnets as its field system is equal to or higher than a base rotational speed (NB), a current condition computing section (16) computes a field weakening reference current (Id*) in accordance with a battery voltage (Vdc), reference torque (T*), and the rotational speed (N). An inverter (12) performs the field weakening control of the synchronous motor (14) in accordance with the field weakening reference current (Id*) sent from the current condition computing section (16) to prevent the deterioration of efficiency and the deficiency of output due to excessive or insufficient field weakening current (Id). The current condition computing section (16) determines an optimum reference current (Id*, Iq*) by using a converged battery voltage (VS) when the battery voltage (Vdc) is converged after initial control.
Bibliography:Application Number: EP19940112417