JPH0193993U

JPH0193993U -

Info

Publication number: JPH0193993U
Application number: JP19087087U
Authority: JP
Priority date: 1987-12-16
Filing date: 1987-12-16
Publication date: 1989-06-21

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例の構成を示すブロ
ツク図、第２図は同実施例の動作を説明するため
の各部の波形図、第３図は従来の遠心分離機の構
成を示すブロツク図、第４図は同遠心分離機の動
作を説明するための各部の波形図、第５図は同遠
心分離機のカツプリングの構成を示す正面図であ
る。３……インバータ、４……インダクシヨンモー
タ（モータ）、１１……速度検出器（速度検出手
段）、１３……減算点、１４……速度制御回路、
（１３，１４が速度制御手段）、１６……電流制
御回路、１７……ＰＷＭ制御回路、（３，１６，
１７が駆動手段）、２２……外部シーケンス回路
（指令手段）、２２ａ……内部タイマ、２２ｂ…
…外部トルクリミツト値発生回路、（２２ａ，２
２ｂが外部トルクリミツト値設定回路）、２５…
…トルクリミツト回路（トルクリミツト手段）。 Figure 1 is a block diagram showing the configuration of an embodiment of this invention, Figure 2 is a waveform diagram of various parts to explain the operation of the same embodiment, and Figure 3 is a block diagram showing the configuration of a conventional centrifuge. 4 are waveform diagrams of various parts for explaining the operation of the centrifugal separator, and FIG. 5 is a front view showing the configuration of the coupling of the centrifugal separator. 3... Inverter, 4... Induction motor (motor), 11... Speed detector (speed detection means), 13... Subtraction point, 14... Speed control circuit,
(13, 14 are speed control means), 16... Current control circuit, 17... PWM control circuit, (3, 16,
17 is a driving means), 22...external sequence circuit (command means), 22a...internal timer, 22b...
...External torque limit value generation circuit, (22a, 2
2b is an external torque limit value setting circuit), 25...
...Torque limit circuit (torque limit means).

Claims

[Scope of utility model registration request]

A motor control circuit that accelerates and decelerates a motor that rotationally drives a heavy inertial body in a predetermined driving cycle, comprising a command means for generating a speed command corresponding to the predetermined driving cycle, and a speed feedback corresponding to the rotational speed of the motor. speed detection means for outputting a signal;
a speed control means for outputting a torque command value based on a deviation between the speed command and the speed feedback signal; a torque limit means for outputting the torque command value within a set limit value; driving means for driving the motor based on a torque command value limited by the means;
When the rotation speed of the motor is reduced to a predetermined low rotation speed, the limit value of the torque limit means is set so that the deceleration torque of the motor becomes zero for a certain period of time when the deviation becomes approximately zero. A motor control circuit comprising external torque limit value setting means for changing settings.