JPS6139893A - Operation system of pole change motor - Google Patents

Abstract

PURPOSE:To sufficiently perform energy-saving effect without delaying switching by providing a detector for detecting outputs at low and high speed operation time, automatically changing the number of poles, thereby always satisfying the output required for a system. CONSTITUTION:When the opening signal of an input vane 8 of a controller 10 exceeds the vane opening theta1 set in the first detector at low speed operation time, the prescribed period signal 13 is delivered to switch the operation. If the first detector is set to the point theta1 near 100% of the vane opening at low speed operation time, it is automatically switched to high speed when the necessary system windage rises to the vicinity of the upper output limit at low speed operation time. On the other hand, if the second detector at high speed operation time is set to the vane opening theta2 corresponding to the point of windage smaller than that obtained at the set opening theta1 in the low speed range, it is automatically switched to low speed when the necessary system windage becomes a range capable of operating at low speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an operation method for automatically changing the number of poles of a pole-changing motor that changes the number of rotations by changing the number of poles.

[Conventional technology]

Figure 1 is a connection diagram of a pole change motor. In Figure 2, (VR), (VS), and (VT) are 8-phase AC power 5i
Dson R, S, and T phase voltages, (1), +21,
(31 is a switch, (4) is a pole change motor, (4a
), (4b), (4c) are the terminals of the pole change motor (4) Nokoi Jl/l (U+), (v+), (W+) C, respectively, the recoils (4a), (4b), (4c), (U
2), (W2), and (V2) are respectively coils (4a),
(4b), (4c) intermediate terminal, (0) is the coil (4a
), (4b), and (4c) are Y-connected to show the neutral point.

Figure 2 is an example of a conventional system configuration diagram using a pole-change motor. In the figure, (5) is a fan, (7) is a wind duct, (8) is an inlet vane that adjusts the amount of air in the air duct (7).

(9) is the air volume command required by the system, αQ is the control device that converts the air volume command (9) into a value suitable for controlling the inlet vane (8) once, 4 is the control power supply, (la) and (2a) are Switch (11, (contact that turns ON when 21 is closed, (lb)
, (2b), (8b) are switches (1), (2+,
A contact (lc) that turns ON when (3) is open.

(2c), (8c) are switches (1), +21, (
3) Coil (closed when excited), (PBH), (PB
L) are pushbutton switches that give high-speed and low-speed operation commands, respectively.

Next, the operation will be explained. In FIG. 1, the state of the switch at high/low speeds is as follows.

That is, at low speeds, the coil terminals (
Eight-phase AC power supply voltages (VR), (VS), and (VT) are applied to U+), CV+), and (W+), respectively, and coils (4a), (4b), and (4) are applied at the neutral point (0).
c) are connected to form one Y connection.

On the other hand, at high speed, the 8-phase AC power supply voltage (VR), (VS)
.

(VT) are intermediate terminals (Uz) and (Va) of coils (4a), (4c), and (4b).

(W2), forming one Y connection centered at the neutral point (0) and a Y connection by the neutral point created by closing the switch (3).

In this way, an intermediate terminal is provided in the motor windings and the current flowing through the coils is changed to create a pole change motor.

FIG. 2 shows an example of a system in which a fan (5) is driven by a pole-change electric motor (4). In Figure 2(a).

Air is sent by the fan (5) from the inlet (7a) to the outlet (7b) of the air duct (7). The air flow rate passing through the air passage (7) is determined by applying the required air (air flow rate) signal C9) from the system to the control device 00, converting it into a value suitable for control of the single-portion vane (8), and controlling the air flow rate of the inlet vane (8). Control the opening,
It will be controlled.

Conventionally, the polarity switching of the pole number changing motor (4) was performed manually using the following sequence. Fig. 2(b)
, contacts (la) and (2b) during low speed operation.

(8b) closed, contacts (2a) and (lb) are open, so the coil (IC) of the switch (υ) is connected to the control power supply voltage on,
a is applied and operates, switch (1) closes, switch t
21, +3) coils (2c) and (8c) are without voltage, and the switch +21, (3) is open.

On the other hand, during high-speed operation, contacts (2a) and (lb) are closed, contacts (la), (2b), and (8b) are open, and the coil (IC)
is without voltage, coils (2c) and (8c) are in operation,
Switch (1) opens.

[2], (31 is closed.

Now 1 Push button switch (PBHI) during low speed operation.

When (PBH2) is pressed, the pushbutton switch (PBHI)
When the coil (1c) is closed, there is no voltage and the switch (1c) is closed.
) is opened, the contact (1b) is closed and the contact (2a) is bypassed (PBH2).
When closed, the coil (2c) and the twitch coil (8C) are energized, the switch (21, +31) is closed, and high-speed operation is switched.The pushbutton switch (PBH2) returns when you release your hand.

High-speed operation is continued by closing contact (2a). vice versa.

Push-button switch (PBL 1) during high-speed operation,
When (PBL2) is pressed, the coils (2c) and (8c) become voltageless due to the opening of the pushbutton switch (PBtt), opening switches +21 and +31, and contact C2b),
(8b) is closed, and the control power supply voltage α is applied to the coil (IC).
υ and a2 are applied, and the switch (υ) is closed to switch to low-speed operation. When the pushbutton switch (PBL2) is released, it returns to its original state, but is held by the contact (1a) and low-speed operation continues.

Conventional pole number conversion and motor operation methods are configured with manual switching as described above, so if a system demand occurs during low-speed operation that exceeds the output that can be covered by low-speed operation, switching to high speed may be delayed or the operator may have to However, due to the operator's carelessness, there are cases where the switch to high speed is not made, and the operator's constant attention is required. In addition, when the operating range reaches a point where the output required by the system can be met at low speed during high-speed operation, the output required by the system can be met at high speed. It had drawbacks such as not being able to achieve its objectives.

[Summary of the invention]

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional motor, and includes a detector for detecting the respective outputs during low-speed and high-speed operation, and the pole number of the motor is changed by the operation of the detector. By switching automatically, the output required by the system is always satisfied, and there is no delay in switching.
The present invention provides an operating method that fully exhibits energy-saving effects and does not require the constant attention of an operator.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 8th
In the figure, μs is the output signal of the detector @1 (not shown) that outputs a signal for a predetermined period when the opening signal for the inlet vane (8) of the control device σQ exceeds a first fixed value, α
4 is an output signal of a second detector C (not shown) which outputs a signal for a predetermined period when the opening degree signal for the artificial vane (8) becomes below a second fixed value.

(18a) and (14a) are contacts that close when the output signal Q10 of the first and second detectors is output, respectively;
lab) and C14b were tested in the first and second tests, respectively.
1ll: This is a contact that opens when the output signal from the l device is α fathom.

Note that the same or equivalent parts as in FIG. 2 are given the same reference numerals. In addition, Fig. 4 is a diagram explaining the detection sensitivity of the first and second detectors, ([(), (L> is the curve showing the relationship between the vane opening degree and the output air volume, (θl), (θ2 ) are opening degree setting values corresponding to the opening degree signals at which the first and second detectors operate, respectively.

Hereinafter, the operation of the present invention will be explained with reference to one embodiment.

In FIG. 8, when the opening signal of the control device oO for the inlet vane (8) exceeds the vane opening (θI) set in the first detector during low-speed operation, a signal μs is output for a predetermined period;
During that period, the contact (18a) is closed and the contact (18b) is opened. As a result, the coil (1c) becomes non-voltage, opens the switch (1), and closes the contact (1b).

When the signal is on, the push button switch (PBH2
) Press t: Same effect as when ・Automatically switches to high-speed operation.

In addition, the inlet vane (8) of the control device rJQ during high-speed operation.
When the opening degree signal for the second detector α becomes less than the vane opening degree (θ2) set at
During that period, the contact (Ha) is closed and the contact (14b) is opened. As a result, the coils (2c) and (8c) become voltageless, and the switches t21 and (31) are opened, and the contacts (2b) and
(8b) is closed, the signal 1lI4 has the same effect as when pressing the push button switch (PBL2) explained in FIG. 2, and the operation is automatically switched to low speed operation.

Now, Figure 4 shows the setting values (θ1) of the first and second detectors.
, [θ2). Opening degree of vane (8) (
is controlled from 0 to 100%, and shows the output air volume of curves (L) and (L) during high-speed and low-speed operation, respectively.

If the first detector is set during low speed operation to the point (θI) where the vane opening is close to 100%.

Automatically switches to high speed when the required system air volume increases near the output upper limit during low speed operation.

On the other hand, the setting of the second detector during high-speed operation is changed to the vane opening corresponding to the point where the air volume is smaller than (but close to) the air volume obtained by the set opening degree (θ1) of the first detector in the low-speed operation range. If it is fixed at degree (θ2).

When the required system air volume reaches a range that allows low-speed operation, the system automatically switches to low-speed operation.

The air volume obtained by the vane opening (θ2) at high speed is smaller than the air volume obtained by the vane opening (θ, ) at low speed. In the above embodiment, the pole change motor (4) is used to prevent the fan (
5), but other rotating bodies such as pumps and compressors may be driven.

In addition, the first
and the inlet vane (8) of the fan (5) as a second detector.
), but any physical quantity that can estimate the output of a single rotating body can be used to achieve the same effect as the above embodiment. In particular, if the first rotating body is a fan, damper control may be used instead of vane control as in the above example, and if the second rotating body is a pump, valve control is performed, but in both cases The same effect as the above embodiment is achieved in opening degree detection.

Furthermore, the first. As a second detector, the current of the motor.

If electric power is used, since these have a functional relationship with the output of the rotating body, it is clear that the same effect as the above embodiment can be achieved.

〔Effect of the invention〕

As described above, according to the present invention, the first
The system is configured to automatically switch between high-speed and low-speed operation using detection signals from the detector and the second detector that detects when the output during high-speed operation has reached the second value. The required output can be automatically obtained, the energy saving effect can be fully demonstrated, and the operator's constant attention to driving is not required.

[Brief explanation of drawings]

FIG. 1 is a connection diagram of a pole-changing motor, FIG. 2 is a system configuration diagram of a conventional pole-changing motor, and FIG. 8 is a system configuration diagram of a pole-changing motor according to an embodiment of the present invention. FIG. 2 is a diagram illustrating setting values of the first and second detectors. In the figure, (1n, +2) and +33 are switches,
(4) is a pole change motor, (8) is an inlet vane, (9)
is the dual force request signal from the system, αO is the control device, C
Ll, C14) are the output signals of the first and second detectors,
(la) and (2a) are switches 61). Contacts that close when (2) is closed, (lb), (2b),
(8b) is a contact that closes when switches (1), 121, and (3) are open; (lc) and (2c); (8c) is the switch tl) + +21, the coil of (3) (closed by voltage application). In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (3)

[Claims] (1) In the operation method of a pole number converting motor in which high speed operation and low speed operation are performed by changing the number of poles, the output of the pole number converting motor during low speed operation has become the first value. a first detector that detects the polarity change motor; a second detector that detects that the output of the pole number changing motor during high-speed operation has reached a second value; and a detection signal from the second detector 1. An operating system for a pole number conversion motor, comprising a switching device that switches the pole number conversion motor to low speed operation and switches it to high speed operation based on a detection signal from the first detector. (2) The method of operating a pole number changing motor according to claim 1, wherein the first detector detects the current or voltage of the pole number changing motor. (3) The operating system for a pole-changing motor according to claim 1, wherein the second detector detects the current or voltage of the pole-changing motor.