Motor control device
A control device and motor technology, applied in the direction of single motor speed/torque control, generator/motor, piezoelectric effect/electrostrictive or magnetostrictive motor, etc., can solve problems such as complex systems
Inactive Publication Date: 2006-03-29
PANASONIC CORP
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Problems solved by technology
Furthermore, for example, in the techniques of Patent Documents 1 and 2, there is a problem that a complex system is required
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[0017] Hereinafter, embodiments of the present invention will be described with reference to the drawings. figure 1 is a block diagram showing an embodiment of the motor control device of the present invention, figure 2 yes means figure 1 An explanatory diagram of the main signals of the motor control unit.
[0018] exist figure 1 In , the same reference numerals are used for the same components as those described in the conventional example (the frequency division number calculation unit 1 and the frequency divider 5 ). The frequency division number calculation unit 1 is constituted by CPU software, counts pulses fed back from an encoder provided in an ultrasonic motor not shown in the figure, and inputs (reads) the frequency of the frequency divider 5 counted by the frequency division number counter 4. The current frequency division number B is changed from the current frequency division number B to the frequency division number A based on, for example, a relatively r...
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A technique for smoothly speed-controlling a speed of a motor whose time constant is relatively small, such as a supersonic motor, under a relatively rough speed control profile and a simple configuration is disclosed. According to this technique, a frequency division number calculating section 1 changes a division number A under the relatively rough speed control profile and sets for a frequency division number setting register 2 . The comparator 3 outputs a+count signal if the division number A set by the frequency division number calculating section is greater than a current division number B counted by a frequency division number counter 4 (the division number A> the division number B), and outputs a-count signal if the division number A< the division number B. The frequency division number counter performs a+count on an enable clock of a time width t, which is shorter than the speed control profile of the frequency division number calculating section, if the+count signal is applied from the comparator, and performs a-count if the-count signal is applied from the comparator, and consequently counts the current division number B of a frequency divider 5 and applies this to the frequency divider.
Description
technical field [0001] The present invention relates to a motor control device for performing acceleration control and deceleration control for a motor with a relatively small time constant such as an ultrasonic motor based on a speed control curve. Background technique [0002] Generally, when the rotation speed of the motor is controlled to the final target speed with a certain acceleration from the stop state, the speed control is performed with a speed control curve that increases the command speed from 0 to the final target speed in a stepwise manner. In addition, the higher the driving frequency of the ultrasonic motor is, the more it decelerates, and the lower the driving frequency becomes, the more it accelerates. Therefore, when the rotational speed of the ultrasonic motor is controlled from a stopped state to a final target speed with a certain acceleration, as shown in FIG. 3A, It is controlled by a speed control curve that lowers the command...
Claims
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IPC IPC(8): H02N2/14H02N2/00H02P6/06H10N30/80
CPCH02N2/142H02P6/06
Inventor 岸隆文新谷启司藤井清
Owner PANASONIC CORP