CS242321B1 - Coupling of the control member to distribute the step size of the step motor evenly - Google Patents

Abstract

The solution concerns the connection of a stepper motor control element, which allows increasing the number of its steps per revolution to an integer multiple of the basic number of steps using the pulse width modulation principle, while maintaining the uniformity of the steps. The connection allows simply dividing the basic step of the motor into an integer number of smaller steps with maximum approximation to uniform division and using a blocking signal at any moment to switch from the operation of the motor with a divided step to the operation mode in basic steps. The connection allows realizing precise position servo systems and speed servo systems with suppressed angular velocity pulsation at low speeds.

Description

242321

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for uniformly dividing the step size of a stepper motor, which allows its steps to be increased per revolution to a number of times the base number of steps using the pulse width modular principle, while maintaining uniformity.

The previously used wavelength-modulated wiring methods do not provide uniform motor size and are therefore unsuitable for application in some types of positional servo systems.

The above drawbacks are eliminated by the engaging member of the invention, which is that the first pulse generator is connected to the first input of the first logical product, the second input is connected to the first input terminal and the output of which is first through a first logic sum member and a first divider connected to a first step of the stepper controller and a second logic sum member and a second splitter connected to a second input of the motor controller, wherein a second switch output is connected to the second input of the first log sum total, the output is connected to the second input of the second logical sum member. The first input of the switch is connected to the second input terminal and the output of the third logical sum member is connected to its second input, the third input terminal is connected to the first input, and the output of the second logical product member is connected to its second input . The output of the second pulse generator is connected to the first input of the second member of the logical product, and the output decoder is connected to its second input, wherein the output of the counter is connected to the decoder input, the first input is connected to the first output of the pre-switch and its second input is connected the second switch output.

The engagement of the control member according to the invention makes it possible to simply divide the motor base step into an integer number of smaller steps at maximum approach and to equally divide the blocking signal from the step-step motor operation into the basic step mode by any blocking signal.

With the connection according to the invention, it is possible to realize precise positioning servo systems and aservosystems of speed with suppressed pulse velocity at low speeds.

In the accompanying drawing, there is shown an embodiment of a control member according to the invention.

The output of the controller 11 is connected to the input of the stepper motor 12, the output of the first frequency divider 7 is connected to the first input, and the output of the second frequency divider 8 is connected to its second input. the output of the first logical sum member 5 and the output of the second logic sum member 6 is connected to the input of the second frequency divider 8.

The first input of the logic product 4 is connected to the first input of the logic sum members 5,6, the first input of which is connected to the output of the first pulse generator 13, and the first input terminal 15 is connected to its second input. the first and the second input of the logic addition member 6 is connected to the second output of the switch 3 at the logical sum 5. The first output of the switch 3 is still connected to the first input of the return counter 10 and the second output of the switch 3 is still a second input terminal 18 is connected to the first input of the switch 3, and an output of the third logic account member 2 is connected to its second input, and a third input terminal 17 is connected to the first input, while the second input terminal 17 is connected to the first input. input is connected output of second member 1 of logical product. The output of the second pulse generator 14 is connected to the first input of the second logic member 1, and the output of the decoder 9 is connected to the second input of the pulse generator 14 and the output of the counter 10 is connected to it. the pulses of the pulse generator 13 are fed via the logic sum elements 5, 6 to the inputs of the two divisors 7, 8. In the case where the two divisors are zeroed at the beginning of the operation, their output pulses will be phase. In this case, the output pulses of the divider 7, which correspond to the requirement to perform the basic step in one direction, and the output pulses of the divider 8 corresponding to the requirement to perform the basic step in the second direction, arrive at the step motor controller 11 in this case. Because the pulses on both inputs of the actuator 11 come simultaneously their effect is canceled and the motor rotor stands. The control pulses applied to the input terminal 17 are inputted via the logic sum element 2 via a switch 3, depending on the logic level connected to the input terminal 16, to the second input of the logic sum member 5, or 6, causing the phase sequence of the output pulse pulses 7, 8. Due to the phase separation of the input pulses of the actuator 11, the width modulation of the currents in the phase windings of the motor is lost. At a sufficiently high frequency of the output pulses of the divider 7.8, the rotor will not be able to follow this and will take up the position in the direction of the vector resultant of the mean currents of the currently switched twin phase windings. The magnitude of the phase adjustment of the output pulses of the divisors 7.8 depends on the number of pulses supplied by the input terminal 17 and from the divider ratio 7, 8, the angle of the small stepmotor being a non-linear function of phase alignment of the divider outputs 7, 8.

Claims (1)

242321 5, it is necessary to ensure that after each pulse applied to the input terminal 17 a suitable change of phase separation of the output pulses of the splitters 7, 8 is effected. This is ensured by the return counter 10, the decoder 9, the logic member 1 and the pulse generator 14. Reversing counter 10 induces a degree of phase separation of the output pulses of the splitters 7, 8. The decoder 9 at the states of the return counter 10 corresponding to the appropriate values of the pulses of the input pulses of the controller 11 gives at its output a signal level 0 and for the other states the signals with a logical level 1 After the control pulse has been applied to the input terminal 17 of the control member, according to the logic level of the signal on the input terminal 18, a definite movement is increased or decreased by 1 of the reset counter 10. At the output of the decoder, the logic level of the signal from 0 to 1 is output and blocked from the member of the logic product 1, the pulse transition from the pulse o generator 14cez member 2 of the logical sum, switch 3 the access of the divider 7, resp. 8 and at first, respectively. the second counter input of the return counter 10. The phase separation of the output pulse counters 7, 8 will increase or decrease. until the decoder output signal level 9 changes to log. 0. The number of logic levels 0 that the decoder 9 generates for the entire cycle of the return counter 10 can be selected by the number of minor steps of the motor within the base step, with the counter 10 at which the decoder generates the log level. 0 must be selected so that the motor step division is uniform. The divider 7, 8 must have the same divider as the number of the return counter 10. By the logic level of the signal applied to the input terminal 15, the step division mode can be disabled and the mode of operation in the basic steps can be called up. SUBJECT CONNECTING THE CONTROLLER TO DISTRIBUTE THE DIMENSION OF THE STEP MOTOR STEP, characterized in that an output of the controller (11) is connected to the input of the stepper motor (12). a divider (7) and an output of a second frequency divider (8) is connected to its second input, wherein the input of the first frequency divider (7) is connected to the output of the first logic sum member (5) and the input of the second frequency divider (8) is the output of the second member (6) of the logic sum, whereby the output of the first logic sum member (4) is connected to the first input of both members of the logical sum (5, 6), to the first input of which the output of the first pulse generator (13) is connected ) and a first input terminal (15) is connected to its second input, and a first and second input of the second member (6) of the logical s is connected to the second input of the first logical sum member (5). the second output of the switch (3) is connected to the account, the first output of which is simultaneously connected to the first input of the reader (10) and the second output of the switch (3) is simultaneously connected to the second input reader (10); the first input switch (3) is connected to the second input (16) and the second input is connected to the output of the third member (2) of the logic account, to the first input of which the third input terminal (17) is connected, and the second input is connected to the second input (17). 1) of the logic product, the output of the second pulse generator (14) is connected to the first input while the output of the decoder (9) connected by its input to the output of the return counter (10) is connected to its second input. 1 sheet of drawings