JPS58170387A - Speed controlling method for motor - Google Patents

Abstract

PURPOSE:To rapidly synchronize a rotating speed of a motor by energizing the motor in response to the time from the external reference pulse to the motor position pulse in response to the arrival of the motor to the prescribed rotating speed. CONSTITUTION:When a motor start signal is supplied to a motor drive circuit for driving the motor, a high level signal is generated from an inverter 3, supplied as a motor drive component to a line 7 through an OR circuit 2 to a motor drive circuit, thereby driving the motor. In this manner, the motor is started rotating, and the rotating speed of the motor is raised. Thus, the motor position pulse is started to be generated. When the rotating speed of the motor becomes larger than the prescribed value, the motor drive component is switched to a pulse train signal generated from a flip-flop 1 from a continuous signal so far. The continuous time of each pulse of the pulse train is the period from the reference pulse to the motor position pulse.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) 1. Technical Field of the Invention The present invention relates to a motor speed control method that improves the way drive pulses are supplied near a predetermined speed.

(2)0 Background of the Invention Conventionally, motors have been used to drive magnetic tape in magnetic tape recording devices, etc., and there are various methods of controlling the motor from the start of driving until it reaches a predetermined speed. . All of the methods known so far have advantages and disadvantages, and no method is necessarily definitive, and there is still room for improvement and development.

(3) Prior Art and Problems In magnetic tape recording devices, etc., the rotational speed of the drive motor is slower than a predetermined rotational speed.

As a method of synchronizing the motor position to a predetermined rotation speed from a certain angle, it is possible to obtain two motor position pulses obtained from the motor position during the reference pulse, so that the motor rotation speed is faster than the predetermined rotation speed. It detects the temperature of the sun and, in response, supplies the motor with a driving component (voltage or current) proportional to the time from the reference pulse to the motor position pulse to synchronize the motor.

However, in this method, if the positional relationship between the reference pulse and the motor position pulse as described above is exactly in the phase relationship as described above, the control as described above is performed, but if the phase relationship of the side pulses is Even though the phase relationship does not meet the above conditions, it is not until after the rotational speed of the motor reaches the desired rotational speed that the desired phase relationship described above, that is, the phase relationship in which two motor position pulses occur between the reference pulses, appears. , since the above-mentioned speed control is entered, the rotational speed of the motor exceeds the predetermined rotational speed by 6 to 7%, and deceleration control must be performed.As a result, the desired rotational speed cannot be achieved. There is a problem in that it takes more time to reach near the speed (within ±0.5%).

(4) Purpose of the Invention The present invention was devised in view of the drawbacks of the conventional methods as described above, and one of its objects is to provide a motor speed control method that can quickly synchronize the rotational speed of the motor. One object is to provide a method for controlling the speed of a motor that can more quickly synchronize the rotational speed of the motor.

(5) 1 Structure of the Invention And, one purpose thereof is to detect the rotational speed of the motor, accelerate the motor in response to the rotational speed being slower than a predetermined rotational speed, and accelerate the motor in response to the rotational speed being slower than a predetermined rotational speed. Another purpose is to detect the rotational speed of the motor and to drive the motor by a value proportional to the time from the external reference pulse to the motor position pulse. Accelerating the motor in response to the rotational speed being slower than a predetermined rotational speed, and applying an external reference pulse or Adjust the phase of the motor position pulses to a phase that can generate the torque necessary for the motor to rotate at a specified rotational speed, and adjust the motor drive to the time between the external reference pulse and the motor position pulse. This is achieved by generating only the corresponding values.

(6) First Embodiment The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a motor drive component generation circuit according to the present invention. This circuit consists of a flip-flop circuit 1, an OR circuit 2, and an inverting circuit 3. A reference pulse is sent to the set input of the circuit 1 from a reference pulse supply source (not shown), and a line 4 is connected to the set input of the circuit 1. A line 5 for sending motor position pulses from a motor position pulse source (not shown) is connected to the reset input. The output of the flip-flop circuit 1 is connected to one input of an OR circuit 2, and the output of an inverting circuit 3 is connected to the other input of the OR circuit 2. A line 4-6 is connected to the input of the inverting circuit 3. Line 6 is ω≧ω. −α (where ω is the rotational speed of the motor, ω0 is the predetermined rotational speed of the motor, α
is a preset constant) from the speed detector (
(not shown).

The output of OR circuit 2 is the motor drive component (motor drive circuit) (
(not shown).

The control aspect of the method of the present invention will be explained through an explanation of the operation of the motor drive component generating circuit configured as above.

As shown in Figure 2, in order to drive the motor,
When the motor start signal (see (2-1) in Figure 2) is supplied to the motor drive circuit, the motor is not yet rotating, so the signal ω≧ω0-α (see (2-3) in Figure 2) ) are at a low level.

Therefore, a high level signal is generated from the inverting circuit 3, which is supplied to the motor drive circuit as a motor drive component (see (2-5) in Figure 2) on the line 7 via the OR circuit 2 to drive the motor. served. As a result, the motor begins to rotate, and the rotational speed ω of the motor gradually increases as shown in (2-6) in FIG. Along with this, motor position pulses begin to occur as shown at (2-2) in FIG.

In contrast, the rotational speed ω of the motor is ω. -α, the ω≧ω0−α signal becomes high level (see (2-3) in FIG. 2).

As a result, the motor drive component is switched from the previous continuous signal to the pulse train signal generated from the flip-flop circuit 1. The duration of each pulse in this pulse train is the time from the external reference pulse (see (2-4) in FIG. 2) to the arrival of the motor position pulse.

In this way, the drive component to the motor is determined, so the predetermined rotational speed ω is maintained as in the conventional case.

A predetermined rotational speed as shown in (2-6) in FIG. 2 without exceeding the rotational speed excessively. It rises to and is maintained in a kneaded state. In other words, it is possible to achieve synchronization in a shorter time than with conventional methods, and it is also possible to cause the driven body to take the desired action in a short time.

FIG. 3 shows an embodiment of the second invention. This example is the first
There is no difference from the embodiment of the first invention except that the reference pulse in the embodiment of the invention is generated by the configuration circuit described below. Therefore, the same reference numerals will be given to the same constituent elements and the explanation thereof will be omitted.

In FIG. 3, 8 corresponds to the reference pulse supply source described in the first invention, and the reference pulse supply source 8 in FIG.
ω≧ω on 6. The reference pulses are all generated under the control of the signal -α and the motor position pulse on line 5. 9 is an AND circuit that connects lines 5 and 6 to the input,
The output of the circuit is connected to a timer 10. Timer 10H (reference pulse interval T) - (-f - pulse duration T0 of the motor drive pulse train in a state where the motor rotates at a predetermined rotational speed); (See Figure 4).

The output of the timer lO is connected to the 7-manufacturer of the pulse generator line 11. This pulse generating circuit is of a type that generates a pulse at the falling edge of the pulse generated by the timer 10.

The output of the pulse generating circuit 11 is connected to a circuit whose output pulse acts only once on a reference pulse generator 12, which will be described below. This circuit connects the output of the pulse generator circuit 11 to the set input, connects the line 6 to the reset input of the flip-flop circuit 13, and connects the inputs to the output of the pulse generator circuit 11 and the reset output of the flip-flop circuit 13. and an AND circuit 14.

The output of the AND circuit 14 is connected to a preset input of a retriggerable timer type reference pulse generator 12 via an OR circuit 15. The output of the generator 12 is also fed back via an OR circuit 15 to its preset input and is connected as the output of a reference pulse source 8 to a set input of a flip-flop circuit 10.

Next, operation 8- of the invention of Consultation 2 having the configuration shown in FIG. Explain.

Of the operations in this invention, the operations up to the generation of the signal ω≧ω0−α are the same as those in the first invention, and will therefore be omitted.

When the signal ω≧ω0−α becomes high level as shown in (4-3) in FIG. 4, the flip-flop circuit 13 is reset. Next, the motor reference pulse ((4-
4)) occurs, the output from the AND circuit 9 activates the timer 10, and from the start time T2;=To
A pulse train signal is generated until the time when -T1 has elapsed (see the fourth (4-7)).

At the fall of this pulse, a pulse is generated from the pulse generating circuit 11, and the flip-flop circuit 13 is set by the pulse. Before the setting is completed, an output pulse appears from the AND circuit 14 in response to the reset output of the circuit 13 and the pulse from the pulse generation circuit 11, and the pulse ・ is applied to the OR circuit 15 and is based on the retriggerable timer type. The pulse generator 12 is preset, and the latest preset state that was previously preset with the output pulse of the generator 12 itself is updated. Accordingly, the reference/curse of the generator 12 changes the pulse interval only once (in the example, it is made longer) as shown in (4-4) in FIG. As shown in FIG. 4 (4-5), the phase of the reference pulse can be adjusted to an appropriate phase for motor synchronization. As a result, when the load is heavy or when T is relatively long, special conditions can be obtained in the drivability of the motor, and synchronization can be achieved more quickly.

Note that (4-1) and (4-2) are not explained in Fig. 4.
) and (4-6) are respectively (2-1) and (2-1) in Figure 2.
This corresponds to (2-2) and (2-6).

In the above embodiment, a method of shifting the phase of the reference pulse for synchronization has been described, but a method of shifting the phase of the motor phase pulse using the same method may also be adopted.

(710 Effects of the Invention) In summary, according to the present invention, in response to the rotational speed of the motor reaching a predetermined rotational speed, the motor is energized in accordance with the time from the external reference pulse to the motor position pulse. By doing so, motor synchronization can be achieved more quickly than in the past. By appropriately matching the phase of the reference pulse or motor position pulse with the phase required for motor synchronization in the above-mentioned energization, Furthermore, the superiority of synchronization is improved.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment circuit of the first invention, FIG. 2 is a timing chart for explaining the operation of the circuit shown in FIG.
FIG. 3 is a diagram showing a circuit according to the second embodiment of the invention, and FIG. 4 is a timing chart for explaining the operation of the circuit shown in FIG. In the figure, 1 is a flip-flop circuit, 2 is an OR circuit, 3 is an inversion circuit, 9 is an AND circuit, 10 is a timer, 1
1 is a pulse generation circuit, 13 is a flip-flop circuit, 1
5 is an OR circuit, and 12 is a reference pulse generator.

Claims (1)

[Claims] 1) Detecting the rotational speed of the motor, and accelerating the motor in response to the rotational speed being slower than a predetermined rotational speed, so that the rotational speed becomes close to the predetermined rotational speed. A method for controlling the speed of a motor, characterized in that the motor is driven by a value corresponding to the time from an external reference pulse to a motor position pulse in response to reaching the motor position pulse. 2) Detecting the rotational speed of the motor, and accelerating the motor in response to the fact that the rotational speed is slower than the predetermined rotational speed, and increasing the rotational speed from slower than the predetermined rotational speed to faster rotational speed. When shifting to the rotational speed, the motor is driven by adjusting the phase of the external reference pulse or the motor position pulse to a phase that can generate the torque necessary for the motor to continue rotating at a predetermined rotational speed. A motor speed control method characterized by generating only a value corresponding to the time from an external reference pulse to a motor position pulse.