JPS59201699A - Controlling method for stepping motor - Google Patents

Abstract

PURPOSE:To control a stepping motor with low power consumption by reducing lower than the drive voltage of a holding torque voltage motor at the motor stopping time. CONSTITUTION:When a pulse train from a motor drive controller 2 is stopped and the rotation of a motor 10 is stopped, the output of a control circuit 14 becomes zero after the laps of time T1 from the input of the final drive pulse to the circuit 14, and a switching transistor 16 becomes nonconductive. When the motor is stopped, transistors T1, T2 connected to coils of phases D and E of the motor 10 become ON. When a transistor 16 becomes OFF, a current due to low voltage VL is flowed through a circuit 18 to the coils of the phases D and E.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stepping motor control method, and is characterized in that a low voltage is used as a holding torque voltage.

A conventional stepping motor control circuit will be explained with reference to FIGS. 1 and 2.

Reference numeral 2 denotes a motor drive controller 1 to roll circuit, which outputs a pulse train for driving the pulse motor. 4 is a phase excitation pattern generation circuit, each output line of which is connected to the base of each transistor of the phase excitation switching circuit 6.

8 is a high voltage time control circuit which is synchronized with the output signal of the phase excitation pattern generation circuit 4.

The high voltage VH is applied to the newly energized phase coil of the Stellar Pink motor 10 only for a preset time 'J'1.

A signal for controlling each base of the switching transistor 12 is output. Reference numeral 18 denotes a voltage supply circuit, which supplies the Trump voltage VM to each phase coil of the motor, and is composed of diodes.

The above circuit is connected as shown.

In the above configuration, the base of each switching transistor of the phase excitation switching circuit 6 is controlled to be turned on or off by the output signal of the phase excitation pattern generation circuit 4, and the drive voltage VM is applied to each phase coil of the Stellar Pink motor 10 in a predetermined order. A current is supplied, a rotating magnetic field force 1 is generated in each phase coil of the stamping motor 10, and the motor 10
The output shaft rotates. When the motor 0 rotates, the bases of the transistors 1 to 2 of the switching circuit 2 are controlled by the control circuit 8, and a current is applied to each phase coil of the stepping motor 10 by the high voltage Vl-1 as shown in FIG. Supplied. This improves the high-speed response of the stepping motor 10. When the generation of the pulse train of the motor drive control circuit 2 stops and the rotation of the motor 10 stops, the switching transistors T], 1 and 2 turn ON (conducting state) and the motor 10 is held for generating a torque. As shown in FIG. 2, 10 currents are supplied to the D-phase coil LE+low coil of the motor by the drive voltage M.

However, since this voltage VM is used for driving a motor and is relatively high, there is a drawback that a large amount of energy is consumed when the stamping motor is stopped, which is extremely uneconomical.

The present invention aims to eliminate the above-mentioned defects.

The structure of the present invention will be explained below with reference to FIGS. 3 and 4.

Reference numeral 14 denotes a drive voltage time control I/roll circuit, which controls the motor drive voltage VM of each of the stepping motors 10 for a preset time T2 in synchronization with the pulses output by the motor drive control 1/roll circuit 2. Switching 1 - transistor 1 so as to apply to the phase coil
This is for ON/OFF control of 6. In addition, since this circuit 14 has a re-I~trigger function using a CR time constant circuit, when the first pulse is input from circuit 2,
``The next pulse will be inputted before 2 hours have elapsed, and the signal will continue to be output from that moment until 12 hours have passed.

Reference numeral 16 denotes a switching transistor 1 whose base voltage is controlled by the controller 1 through the roll circuit 14 . 2
0 is a low voltage VL supply line and is connected to the voltage coupling circuit 18 via a diode.

As shown in FIG. 4, the low voltage VL is the drive voltage VM.
However, in implementing the present invention, it is sufficient that the drive voltages are smaller than the drive voltages V and M. Note that the other configurations are the same as the circuit shown in FIG.

Next, the operation of this embodiment will be explained.

When the generation of the pulse train from the motor drive fan 1 to the roll circuit 2 stops and the rotation of the motor 10 stops, the 9 circuit 14 starts after +IJ·T2 time has passed since the last drive pulse was input to the drive voltage time control circuit 14. The output becomes zero, and the switching transistor 16 becomes non-conductive (OFF). When the motor is stopped, as shown in Figure 4, the motor 10th D
Each transistor TI connected to the phase coil and E-phase coil.

T2 is in conduction state J (ON). The transistor 16
becomes non-conductive, current due to the low voltage vL flows through the circuit 18 to the D-phase coil and E-phase coil, and as shown in the figure, the current value flowing through the D-phase and E-phase coils is determined by the drive voltage VM. The current value is converted into a current value by the low voltage VI-.

As described above, the present invention is designed to lower the holding torque voltage when the stepping morph is stopped than the motor drive voltage, and therefore has the effect of being able to control the stepping motor with low/f4 power consumption.

[Brief explanation of the drawing]

Figure 1 is an electronic circuit diagram of the conventional scheme, Figure 2 is an explanatory diagram of the same, and Figure 3 is an explanatory diagram of the same.
The figure is an electronic circuit diagram. FIG. 4 is an explanatory diagram. 2...Motor drive control 1-roll circuit, /I゛=゛phase excitation pattern generation circuit, 14...-Drive voltage time control circuit, 16...Switching transistor

Claims (1)

[Claims] ], a stepping motor control method in which a rotation stop pressure is applied to an output shaft of a Stella Pink motor, characterized in that the voltage for holding torque is switched to a voltage lower than a voltage for driving the stepping motor. .