JPH04193086A - Motor controller - Google Patents

Abstract

PURPOSE:To perform stable motor control by setting the rotational speed of a motor to the narrow speed range including the stable speed range when it is separate greatly from the stable speed, and changing the speed range over to the one wider than the narrow speed range when it reaches the narrow speed range. CONSTITUTION:Since the value f1, with which the speed range to operate the phase control system becomes relatively narrow, is given to the parameter fA, it judges that to be not f0-f1<f<f0+f1 at the start of the motor, etc., such as a C part. And a flag A is made 0 and f1 is given to fA. Then, each time a CTL signal is input, it outputs a fixed phase value P0 as a PWM signal. When the rotational speed f of the motor reaches the vicinity of the stable speed f0 and it judges that f0-f1<f<f0+f1, the flag A is made 1, and fA is changed into f2 larger than f1. Then, each time CTL signal is input within the range of f0-f2<f<f0+f2, the phase P calculated from the input time of the CTL signal is output from the PWM output circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a motor control device that controls the rotational speed and rotational phase of a motor.

[Prior Art] A beef cattle system in a capstan control device of V TF < will be described below as an example.

FIG. 3 is a block circuit diagram showing an example of a capstan motor control device.

[11 (+1 is the carburetor or tongue motor, (21
is the capstan, (3) is the magnetic tape, and (4) is the
G (Frequency Gcnerator,
A control (CTC) head (5) generates a frequency signal depending on the rotational speed of the capstan motor. (6
) is a speed detector that detects the rotational speed of the capstan motor (1) from the FG signal obtained from FG +51. (7) is a phase detector which detects the rotational phase of the capstan motor (1) from a CTL signal obtained by waveform processing the signal reproduced from the control head (4). (
8) is a phase-locking signal generation circuit that generates a phase-locking signal, and (9) is a switching circuit that uses the output of the speed detector (6) to switch between the output of the phase detector (7) and the phase-locking signal generator. l
Switch between the output of the J circuit (8) and the output of the J circuit (8). (+01 is P W
M output circuit outputs the output of the speed detector (6) as PW M
(Pulse Width Modular Lion) signal and output. (11) is a PWM output circuit that converts the output of the phase detector (7) into a PWM signal and outputs it. (12) is a compensation filter that performs phase compensation of the phase control system.

(13) is an adder circuit that adds the output of the PWM output circuit (10) and the output of the compensation filter (12).

(14) is a dryer drive circuit, which drives the gear stun dryer (11) according to the input from the adder circuit (13).

Figure 4 shows the speed detector (6) in Figure 3 or 6F' W M
Speed control system up to the output circuit (10) and one phase detector (7)
) to the PWM output circuit (11) is a small diagram of the algorithm of the phase control system.

Next, this conventional example will be explained based on the algorithm shown in FIG.

In step 20, the variable fA is set to a value f1 for determining the speed range in which the control operation by the phase control system is stopped +L, and the phase P is set to the identified a phase value PIl.

Note that the fixed phase value P is maintained until a new phase value is obtained by manually inputting the CTL. When the capstan motor (1) rotates and FG (-+'j ”J or C1 is obtained, the process moves through step 21 to step 22, and FG
Calculate the speed f from the human power time of the signal. After that, the process moves to step 23, and the PWM output circuit (10) changes the speed f to P
WM (converted to Th number and output. After that, step
Moving to the knob 24, the speed [ is the speed range (f.

-fA<f<to +fA), and if it is within the range, the flag Δ is set to 1 in step 25, and if it is outside the range, the flag Δ is set to O in the step 26, and the process moves to step 21. Thereafter, this operation is repeated every time the FG signal is input manually.

From control Soto (4) to CT1. When the signal is input, the process moves to step 28 through step 27, and if the flag △ is 1, the phase P is calculated from the CTL and input time in step 29. If the flag A is 0, step 30 is entered.
Phase F) Fixed explant P. shall be. After that, in step 31, the PWM output circuit (11) outputs (-"l phase P to PW
Convert to M signal and output. From now on, CT L, I, j
Repeat this action every time the machine is powered.

Phase control system)) W M signal is a compensation filter (12)
After passing through the speed control system PWM signal and the p-addition circuit (I3
), and after being converted into DC, it is manually input to the motor drive circuit (14) to control the capstan motor (11).

FIG. 5 is a diagram showing the control characteristics of this conventional device, where FIG. 5 fal shows the speed characteristics of the motor, and FIG. 5(b) shows the output characteristics of the phase control system.

When the capstan motor (1) is started, the motor's synchronous rotational speed is a stable speed f. If it has not reached the vicinity, operating the phase control system will have little effect in terms of stabilizing the system. Therefore, in such a situation, the operation of the phase control system is stopped and the motor is controlled only by the speed control system, and when a stable speed is reached, the phase control system is activated to stabilize the system. It is switched like this.

In other words, as explained in the algorithm of Fig. 4, the speed setting range (ro r+〈[〈[.
t'), and if it is outside the range, flag A is set to O to stop the operation of the phase control system (Part A), and if it is within the range, flag △ is set to 1 to start the phase control system (Part B). Department)
(See Figure 5) The control system is made stable.

[Problems to be Solved by the Invention] Since the conventional motor control device is configured as shown below, it is difficult to perform phase pull-in at startup, speed rise, etc.
By narrowing the speed range in which the phase control system operates in order to improve the time, - Since the speed pull in boat fishing is oscillatory, the fluctuations until the speed becomes stable as shown in Figure 6 ('a) will be reduced. Since the speed range is exceeded and the phase becomes locked or phase controlled as shown in Figure 6 fbl, there is a problem that the phase pull-in time and the time until the speed stabilizes become longer. , also the 7th M
If the speed range in which the phase control system is operated is widened as shown in Figure 7 (b), the phase control system will start operating even when the speed is much lower than the stable speed, so the phase pull-in time and speed will be reduced. There was a problem in that it took a long time to rise.

In VTR capstans, there are various motor speed changes in each motor, and it is difficult to determine a speed range that satisfies all of these, so conventionally the speed range has been determined as a compromise.

This invention was made to solve the problems described in 1-4, and it is possible to improve the phase pull-in time and speed rise time at startup, etc., regardless of the various motor states in each mode. It is an object of the present invention to provide a dry-sun control device that can realize stable motor control by improving the time required for the speed to become stable.

[Means to solve the problem]

The motor control device according to the present invention sets the speed range in which the phase control system is operated at the time of starting the motor to a relatively narrow range that includes a stable speed, and when the speed reaches within the speed range, the two-phase control is performed. The present invention is characterized in that it includes means for switching the speed range in which the system is operated to a wider speed range than the narrow speed range described above.

[Function] The means for switching the operating range of the 1-in phase control system in this invention sets the set speed range to a relatively narrow range that includes the stable speed when starting the motor, so the 1-phase pull-in time and , the speed rise time becomes faster.

In addition, when the speed of the drying and drying reaches within this set speed range, the speed range in which the phase control system operates is switched to a relatively wide range that includes the stable speed, reducing the time required to pull in the rotational phase and stabilizing the speed. EXAMPLES [Embodiments] Examples of the present invention will be described below with reference to the drawings.

The configuration of this embodiment is the same as the block circuit diagram shown in FIG. 3, so a description thereof will be omitted.

FIG. 1 is a diagram showing the algorithm of this embodiment, and FIG. 2 is a diagram showing the control characteristics of this embodiment.

Next, the control operation will be explained using FIG. 2.

The operations from step 20 to step 23 are the same as those of the conventional example shown in FIG. 4, so the explanation will be omitted. The variable fA has a value f that makes the speed range in which the phase control system is operated relatively narrow.
, is given, so in step 24, when starting a motor such as part 0 in fal in FIG. 2,
[. Since it is determined that -[l<f<fO+f, the flag A is set to O in step 26, and fl is given to fA in step 33. Thereafter, each time the CTL signal is input, in steps 27 to 31, the fixed phase value P0 is output as a PWM signal as shown in FIG. 2(b).

Note that steps 27 to 31 are the same as the description of the operation of the conventional example, so the details will be omitted.

Eventually, the rotational speed f of the motor reaches a stable speed f. When it reaches the vicinity, in step 24 [. −f, <f<f.

+l, the flag △ is set to 1 in step 25, and FA is switched to [, larger f2 in step 32.
Ru. after that[. −f2<f<f.

Each time the C'T' L signal is input within the range of +f2, in steps 27 to 31, the CTI,
The phase P calculated from the input time of the signal is output from the PWM output circuit (II) (section D).

The subsequent operations are the same as those of the conventional example, and will therefore be omitted.

According to this embodiment, during a transition period such as when the motor is started, the speed range in which the phase control system operates is set to be relatively narrow, and the motor is controlled by the speed control system, so that the speed rises quickly. After reaching a stable speed, the phase control system operates over a relatively wide speed range, so the control system can be stabilized more quickly. Therefore, optimal motor control can be performed.

In the above embodiment, a PWM signal is output for each of the speed control system and the phase control system, and then the addition is performed. However, after adding the speed detection data and the phase detection data, the PWM signal is You may also change it to

In addition, in the above embodiment, there are two speed ranges, narrow and wide, in which the phase control system is not activated, and the speed range is set to 1 or more, and the speed range is changed in the order of narrow - wide, intermediate -> narrow. The switching between wide and intermediate/narrow may be performed by setting a timer, or may be performed each time the speed reaches a predetermined speed range.

Further, in the above embodiment, the speed range in which the one-phase control system is operated is the stable speed f. The width is set to be the same above and below with the center at the center (for example, f.-[1<f<f.

(111) is, for example, fO−fl<f<f in accordance with the fluctuation state of the rotation motor of the motor. The lower L may be set to a different speed range, such as +f2.

Further, in the above embodiment, a reproducing system of a capstan motor of a VTR is shown, but other control devices such as a recording system or a tram control device may be used, and the same effects as in the above embodiment can be obtained. play.

Further, in the above embodiment, speed detection, phase detection, switching of the operating range of the phase control system, etc. are configured to be controlled by software, but they may be configured by hardware.

[Effects of the Invention] As described above, according to the present invention, during a transient period such as when starting the motor, the speed range in which the phase control system operates is set to a relatively narrow range across the stable speed. When the speed reaches this range, the speed range in which the phase control system operates is switched to a relatively wide range that includes the stable speed, depending on the condition of the dryer. This reduces the phase pull-in time and increases the speed. As well as being able to see the full extent of A″l,
This has the effect of providing a motor control device that can perform stable drought-sun control.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an algorithm of a capstan motor control device for a VTR which is an embodiment of the present invention, Fig. 2 is a diagram showing the control characteristics of this embodiment, and Fig. 3 is a diagram showing this embodiment and a conventional example. A block circuit diagram showing the hardware configuration of the V-1'R cab scan motor control device, FIG. 4 is a diagram showing the algorithm for controlling the capstan motor of this conventional example, and FIGS. FIG. 7 is a control characteristic diagram for explaining the operation of the conventional example shown in FIG. (1)...Capstan drying, (6)...Speed detector, (7)...Phase detector, (9)...Switching circuit, (10)ill, l... PWM output circuit, (
13)...addition circuit, (I4)...motor drive circuit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] (1) A means for controlling the rotational speed of the controlled motor using a rotational speed detection signal, a means for controlling the rotational phase of the motor using a rotational phase detection signal of the motor, and a rotational speed of the motor that is stable. means for switching the control operation of the phase control system to stop when the speed is outside a predetermined speed range provided on both sides of the speed range, and to perform the control operation of the phase control system when the speed is within the predetermined speed range; In a motor control device equipped with a A motor control device comprising means for switching a speed range in which the phase control system operates to a speed range wider than the narrow speed range when the speed reaches the narrow speed range.