Synchronous motor control for electric vehicle

• Main Authors: TAKEUCHI, AKISHIRO, KUSANO, KATSUYUKI, SAITO, YUJI, KANAI, YASUSHI
• Format: Patent
• Language: English; French; German
• Published: 09.02.1994
• Edition: 5
• Subjects: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES; ELECTRICITY; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERATION; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; PERFORMING OPERATIONS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TRANSPORTING; VEHICLES IN GENERAL

A synchronous motor control system (1) controls a synchronous motor (4) on an electric vehicle for propelling the electric vehicle in a propulsive mode or regenerating electric energy in a regenerative mode. The synchronous motor control system has a rotational speed sensor (16) for detecting a rotational speed of the synchronous motor, an accelerator for producing a torque command signal, and a driver (3) connected between a battery (2) on the electric vehicle and the synchronous motor, for operating the synchronous motor in either the propulsive mode or the regenerative mode. A controller (5) is responsive to the rotational speed detected by the rotational speed sensor and the torque command signal produced by the accelerator, for controlling the driver to operate the synchronous motor in either the propulsive mode or the regenerative mode. The controller has maps (9, 10) for storing lead and lag values which are selectively readable to control the driver to operate the synchronous motor with a maximum efficiency based on two parameters.