Controlling device of brushless motor

Abstract

Abstract PURPOSE: To simplify the configuration of the controlling device and to obtain a control characteristic same as an ordinary DC motor by a method wherein the actual speed signal of a brushless motor, the deviation signal between the actual speed signal and the speed setting signal and the inversion signal thereof are supplied to electric power control elements as a voltage or current command. CONSTITUTION: A setting value V 1 of a speed setting device VR1 and a speed detection value V 2 by means of a tachogenerator TG are compared and amplified in a deviation amplifier A4 and a deviation ΔV is output. And further, the ΔV is supplied to an inversion amplifier A5 of a gain -1 and a deviation -ΔV is output. The ΔV and the -ΔV are alternately entered in analog switches SW1∼SW6. And the analog switches SW1∼SW6 are made open and closed by means of the output r∼t of a pole sensor PS and the NOT output thereof inverse r∼inverse t. And further, ΔV and -ΔV are output alternately, thus, driving signals are given to power transistors Tr 1 ∼Tr 6 , through pre-amplifiers A1∼A3, thus, each of phase terminal voltages r 2 ∼t 2 are fed back by means of a voltage minor loop. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Shuichi Takanami
• 👤 Shigemitsu Oguchi
• 👤 Shigeru Sakurai
• 👤 Takayuki Toya

Bibliographic Details