CS224833B1 - Connexion for control of motion of jogging electric motor - Google Patents

Description

(54)

Connected to the stepper motor control point

Giant. /

on </ melt <M ™ 1 4 (?) M areu βϋ 1 030

224 833

224 833

BACKGROUND OF THE INVENTION The invention relates to a wiring for controlling the operation of a stepper electric motor.

In stepper motors operating over a larger stepping frequency range, their resonance, which can lead to a loss of steps, is a problem. The resonance is therefore damped either mechanically or electrically, by means of braking pulses generated on the basis of the speed servo loop or by delay circuits. Mechanical damping deteriorates the torque characteristics of stepper motors, and wiring with a high-speed servo loop is quite complex. The hitherto known circuitry generating braking pulses based on the delay of the stepping pulses is quite complex, since it comprises multiple monostable flip-flops combined with output decoders for the individual phases of the stepper motor and a bidirectional phase counter. In addition, setting up a plurality of monostable flip-flops to obtain optimal operation of the stepper motor is complicated.

These disadvantages are overcome by the stepper motor control circuit according to the invention, which is characterized in that the first resolution circuit input is connected to the first bidirectional counter of the forward count counter and at the same time constitutes the first circuit input for forward step pulses, the second resolution circuit input is connected to the second input of the bidirectional phase counter for reverse counting and at the same time forming the second input of the reverse pulse circuit, the first output of the resolution circuit is connected to the clock input of the optimization circuit while its second output is connected to the input of the optimization circuit to control sense of rotation; the phase counters are connected to the phase inputs of the optimization circuit, whose phase outputs are connected to the inputs of the power member, while the outputs of the power member simultaneously form the outputs of the wiring for the connection to the phase e stepper motor.

2224 833

In addition to eliminating the disadvantages mentioned above, the advantages of the stepper motor control system according to the invention are its simplicity, the modularity of the individual parts, the overview of the function and the easy feasibility by means of common integrated circuits.

An example of a wiring of a stepper motor according to the invention is shown in the accompanying drawings, in which: FIG. 1 is a block diagram, FIG. 2 is a timing diagram of the forward function and FIG. 3 is a timing diagram of the reverse function.

The first input 11 of the resolution circuit 6 is connected to the first input 21 of the bi-directional counter 2 for forward counting and simultaneously forms the first input 61 of the circuit for forward jog pulses Kile. and form at the same time a second wiring input 62 for the return stepping pulses KI2. The first output 01 of the resolution circuit 1 for the signal IK1 is connected to the clock input 31 of the optimization circuit X, while its second output 012 for the signal ISM. it is connected to the input 32 of the rotation sense optimization circuit. The first output 021 of the bidirectional phase counter 2 for the IFA signal is connected to the first phase input 33 of the optimization circuit χ, while its second output 022 for the IFB signal is connected to the second phase input 34 of the optimization circuit χ. The first phase output 031 of the OFA optimization circuit X is connected to the first input 41 of the power member 6, while its second phase output 032 for the QFB signal is connected to the second input 42 of the power member 4. the first to fourth outputs 061 to 064 of the circuit for connecting the phases of the four-phase stepper motor χ. For a four-phase stepper motor χ, the 2-phase bidirectional counter 2 has two outputs 021 and 022, and the χ optimizer circuit also has two outputs 031 and 032. For a multi-phase stepper motor, three outputs of the bidirectional phase counter 2 and three outputs of the optimization circuit χ and eight outputs of the power element 6 will be required.

After applying the forward jog pulses Kil from the control unit (not shown), a logical level ISM signal ISM appears on the second output 012 of the resolution circuit 1, representing the forward sense of rotation of the stepper motor χ. At first

224 833 of the output circuit 1 of the resolution circuit 1, an IKI signal representing the stepping pulses that are generated by the logical sum of the input stepping pulses K1 and K12 appears. Bi-directional counter 2 counts forward and outputs the IFA and IFB signals fed to the optimization circuit 2 · From each IKI pulse, a braking pulse of width tB is generated in the optimization circuit 3 to modify the phase signals IFA and IFB so that during the braking pulse tB, the previous state of the phase signals is generated and thus the braking of the running of the stepper motor 5 is prevented. The modified signals jsou.jako OFA and OFB signals supplied to the power member 4, which ensures the appropriate switching stages for forward stepper motor 5 · Reverse rotation of the stepper motor 5 ^is obtained by applying reverse jog them; uls KI2, the wiring activity is similar. The operation of the wiring is further evident from the timing diagrams in FIGS. 2 and 3.

The connection to the operation of the stepper motor according to the invention can be used, for example, in automation technology, coordinate recorders, in the drive of printers, in the drive mechanism of the magnetic heads of the disk memories and the like.

Claims (1)

SUBJECT OF THE INVENTION Connection to a stepper motor control with bidirectional phase counter and power member, characterized in that the first input (11) of the discriminator circuit (1) is connected to the first input (21) of the bidirectional phase counter (2) for forward counting and forming the first input (61) a forward step pulse circuit, the second input (12) of the discriminator circuit (1) is connected to a second input (22) of the backward phase counter (2) and simultaneously forms a second reverse step pulse input (62), the first output (011) of the discriminator circuit (1) is connected to the clock input (31) of the optimization circuit (3), while its second output (012) is connected to the input (32) of the optimization circuit (3) to control the sense of rotation; 021) bidirectional phase counter (2) is connected to the phase inputs (33,34) of the optimization circuit (3), whose phase outputs (031,032) are connected to the inputs (41,42) ) of the power member (4), wherein the outputs (041,042,043,044) of the power member (4) simultaneously form the outputs (061,062,063,064). wiring for connection to the phases of the stepper motor (5) »