JPH09191681A - Drive controller for motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to control a plurality of motors of different kinds using one drive controller. SOLUTION: Between an inverter circuit 12 and a required motor 14, a connector 16 for connecting both members electrically is arranged, and to the other side of this connector 16 a distributor 17 which is connected to a rotational position detecting signal outputting means or grounded, and outputs a drive control signal to the inverter circuit 12 is connected. And an input current to the inverter circuit 12 is detected, and by a controller 20 in which a voltage value corresponding to this is program-set beforehand a specified pulse width modulation signal (a voltage control signal) is outputted to the distributor 17 through a control means 22. And the distributor 17 outputs control signals such as the rotational position information etc., of the motor 14 and pulse-width- modulated drive control signals for voltage control to the inverter circuit 12 to drive/control this inverter circuit 12, and the revolution control of the required motor 14 connected to the connector 16 is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention makes it possible to improve the load fluctuation characteristics of a motor of different types using a single drive control device, and to drive it with either AC or DC. The present invention relates to a drive control device for an electric motor.

[0002]

2. Description of the Related Art Conventionally, for example, when performing drive control such as speed control of an electric motor, one drive control device is always required for each electric motor. The relationship between the electric motor and the drive control device will be described with reference to FIGS. 11 and 12. For example, in the case of the brushless DC electric motor M ₁ , as shown in FIG.
A DC power source 1 having a variable power source voltage and a predetermined number of switching elements (transistors) 3 for energizing a stator winding (not shown) of each phase of the DC brushless motor M ₁ are provided.
Inverter circuit 2 configured by phase bridge connection, and DC
Three Hall ICs 3a, 3b, 3c which are arranged around the rotor (not shown) of the brushless motor M ₁ so as to have a phase difference of 120 ° in terms of electrical angle and detect the rotational position of the rotor.
And a control circuit (distribution circuit) 4 which is connected to the Hall ICs 3a to 3c via a signal line and outputs a control signal to the inverter circuit 2 based on a rotational position detection signal from the Hall ICs 3a to 3c. And this control circuit 4
The output signal from the DC brushless electric motor M ₁ is controlled by controlling the timing of energizing the transistors in the inverter circuit 2.

Further, in the DC motor M ₂ shown in FIG. 12, a DC power source 5 whose voltage can be varied is used. By varying the voltage of this DC power source 5, the drive of the DC motor M ₂ is controlled. Was there.

[0004]

As described above, the drive of the DC brushless motor M ₁ and the DC motor M ₂ is individually controlled by using the drive control device or the like. That is, since the two electric motors are generally configured to have different specifications, it is difficult to individually drive and control a plurality of electric motors having different specifications by using one drive control device. For this reason, it is generally customary to individually use drive control devices corresponding to the electric motors used.

Therefore, for example, a three-phase DC brushless electric motor capable of obtaining high torque when a heavy hanging cabinet or bed apparatus is moved up and down, such as an electrically driven hanging cabinet or a bed apparatus for physically handicapped persons. It does not require a relatively large force, such as when the door of the hanging cabinet is opened and closed, or the back and lower floors of the bed device are tilted at a predetermined angle when used. When driving with, a low-power DC motor may be used.

As described above, when a plurality of electric motors are used according to the purpose, the drive control device must be compatible with the electric motor to be used, and as described above, the type of electric motor to be used can be different. Naturally, it is very uneconomical because it requires a drive control device corresponding to the electric motor to be used, and it is also necessary to reduce the size of furniture that uses the electric motor and to reduce the manufacturing cost of furniture with electric motor. There was a problem of causing trouble.

In view of the above various problems, the present invention provides an electric motor incorporating different kinds of electric motors by individually controlling the driving of a plurality of electric motors having different specifications by one drive control device. It is an object of the present invention to provide a drive control device for an electric motor, which is capable of driving and controlling electric furniture such as a hanging cabinet and a bed device.

[0008]

In order to solve the above problems, the present invention provides an inverter circuit connected to a DC power source for outputting a three-phase AC power source, and an electric motor driven by the output of this inverter circuit. A rotor position detection signal of the electric motor is output via a connector that is arranged between the terminals and a connector that connects a power supply line that connects the inverter circuit and the electric motor to the terminal, and a signal line that is connected to the terminal on the lower side of the connector. A drive control signal output distributor connected to the signal output means for instructing the inverter circuit of the order of energization to each winding of the motor, and the input current of the inverter circuit is detected and smoothed to obtain an average value. Current value smoothing means for smoothing the current value to a proper current value, and a command voltage corresponding to a current value preset according to the load characteristics of the motor, including a start command for the motor. A controller that outputs a voltage corresponding to the detected current value as a command voltage is compared with a command voltage output from the controller and a triangular wave signal output from a triangular wave generation circuit, and a pulse signal with a predetermined pulse width modulation ( Control means for outputting a speed command signal) to the distributor.

Then, the distributor outputs a drive control signal for appropriately controlling the drive of the electric motor to the inverter circuit on the basis of the electric motor information input from the electric motor side and the speed control information input from the controller side to constantly output. It is characterized in that a plurality of electric motors having different specifications are individually driven and controlled by one drive control device.

[0010]

In the drive control device of the present invention, a connector having a plurality of connection terminals arranged in series is arranged between the inverter circuit and the electric motor, and one end of the connector is connected to the output end of the inverter circuit and the other end is connected to the connector. An input terminal of a distributor that outputs a drive control signal to an inverter circuit is always connected to the inverter circuit. For example, when driving and controlling a DC brushless motor, each phase stator winding of the motor is connected to an inverter of a connector. A rotor position detection sensor (for example, a Hall IC) that is connected to a terminal that connects an output end of a circuit via a power supply line and detects a rotational position of a rotor of an electric motor is a connector for connecting an input end of a distributor. Connected to the terminal via a signal line, when operating the electric motor, the rotational position detection signal from the rotational position detection sensor is logically converted, and the inverter corresponds to the rotational position. A drive control signal for sequentially turning on the transistors forming the required upper and lower arms of the path is output from the distributor to the inverter circuit, and the DC current is converted into a three-phase AC by switching the upper and lower arms sequentially. Then, the alternating current sequentially flows through the stator windings of each phase of the DC brushless electric motor to drive the electric motor to rotate in one direction.

Further, instead of the DC brushless electric motor,
For example, in the case of controlling the drive of a DC motor with a brush, the windings of the DC motor are connected to the output terminals of two phases, for example, the U phase and the V phase, which are connected to the terminals of the connector of the inverter circuit, while the distribution is performed. Of the terminals of the connector to which the input terminal of the power supply is always connected, for example, the input terminal of the W phase is grounded, and the control signal input from the remaining U and V phases causes the distributor to output the inverter to the control signal. A drive control signal for driving only the predetermined upper and lower arms of the circuit is output, and a DC voltage is applied to the winding of the DC motor from the output terminals of the U and V phases of the inverter circuit through the power supply line to generate a DC voltage. The electric motor is driven to rotate in one direction.

When controlling the speed of the DC brushless motor or the DC motor, the input current value of the inverter circuit is detected, the command voltage corresponding to this current value is output from the controller, and the command output from this controller is output. The voltage is compared with the triangular wave signal given from the triangular wave generating circuit, and when the triangular wave signal falls below the command voltage, the control means outputs a pulse width modulation signal of "L" level,
In the opposite case, the electric power is not supplied to the electric motor because the output becomes "H" level and the controller does not output. That is, at the "L" level, the control means outputs a pulse width modulation signal having a variable on / off duty. The distributor outputs to the inverter circuit a drive control signal that varies the period during which the required transistor in the lower arm of the inverter circuit is turned on based on the pulse width modulated speed command signal, and turns on the required period of the required transistor in the lower arm. The speed of the electric motor is controlled by changing.

In this case, the ON period of the required transistor of the lower arm of the inverter circuit is set by the input current value of the inverter circuit, so that the drive control of a motor having different specifications is always constant. It can be performed under the conditions of. That is, when the current value input to the inverter circuit is low, the command voltage output from the controller is reduced to shorten the energization period of the inverter circuit, thereby equivalently reducing the voltage applied to the motor, and conversely, When the input current value is high, the energization time of the inverter circuit is lengthened to increase the voltage applied equivalently, thereby improving the required load fluctuation of the motor. Therefore, in electrically driven furniture, for example, in a bed device for a physically handicapped person, when a DC brushless electric motor used to raise and lower the bed itself and only the back floor or the lower floor of the bed are tilted by a certain angle. Since the DC motors used can perform speed control with reference to the input current of the inverter circuit even if the load torques are different from each other, even if the two motors have different configurations, the drive control device according to the present invention can be used. Easy and
It is convenient because the rotation can be accurately controlled.

[0014]

Embodiments of the present invention will be described below with reference to FIGS. In FIG. 1, 11 indicates a DC power source,
Reference numeral 12 is, for example, a three-phase full-wave bridge type inverter circuit connected to the direct-current power supply 11, and is configured to convert the direct-current voltage supplied from the direct-current power supply 11 into a three-phase alternating current at the three-phase full-wave bridge portion. . That is, in the three-phase full-wave bridge portion, six transistors u, v, w, x, y, z are connected as switching elements to three pairs of arms corresponding to the three phases. , W are connected to the upper arms, and the other three arms connected to the other transistors x, y, z are called lower arms. A free wheel diode 13 is connected in parallel to each of the six transistors u to z, and the three connection points of the upper arm and the lower arm serve as the output terminals of the inverter circuit 12.

In FIG. 1, reference numeral 14 is a DC brushless electric motor (hereinafter referred to as electric motor), and this electric motor 14 has stator windings u ₁ , v ₁ and w ₁ , a rotor 15 formed of a permanent magnet, and Rotor position detection sensors Hu, H such as three Hall ICs for detecting the rotational position of the rotor 15
v and Hw. Reference numeral 16 designates a connector arranged between the inverter circuit 12 and the electric motor 14, and in this embodiment, nine connection terminals a _{1 to} a ₉ are arranged in a row in a row at a predetermined interval, for example, in the connector 16. Has been done.

The connection points of the upper and lower arms of the inverter circuit 12, that is, the phase output terminals U, V, W of the inverter circuit 12 are connected to the connection terminals a ₁ -a of the connector 16.
_The electric motor 1 via the power supply lines b ₁ , b ₂ and b ₃ connected to the motor _3.
4 stator windings u ₁ , v ₁ , w ₁ . The connection terminal a ₄ of the connector 16 has a constant voltage power supply (for example, 5 V) Vcc which is set to a predetermined voltage from a power supply circuit (not shown) and outputs Vcc.
0) is a terminal for connecting the device to the constant voltage power supply Vcc, and a ₅ is a ground terminal.

Reference numerals a _{6 to} a ₈ denote rotor position detection sensors Hu, Hv, Hw of the electric motor 14 and input terminals (U, V, H) of a distributor 17 for outputting a drive command signal to the inverter circuit 12.
And each phase of W) via the signal lines c ₁ , c ₂ , c ₃ and the rotor position detection sensor H.
The rotational position detection signals from u, Hv, and Hw are distributed through the signal lines c ₁ , c ₂ , and c ₃ connected to the constant voltage power supply Vcc between the connector 16 and the distributor 17 via pull-up resistors. Sent to 17.

The rotational position detection signal sent to the distributor 17 is logically converted by the distributor 17,
The output terminal outputs the drive control signal to the inverter circuit 12. That is, it is given as a drive control signal to the bases of the respective transistors u, v, w of the upper arm of the inverter circuit 12 and the respective transistors x, y, z of the lower arm. Then, the rotational position detection signal is logically converted, and corresponding to the rotational position, for example, as shown in FIG. 3, the transistor u in the upper arm of the inverter circuit 12 and the transistor y in the lower arm thereof, the transistors u and z, A drive control signal for sequentially turning on the transistors of each combination of the transistors v and z is output to the inverter circuit 12.

In the inverter circuit 12, the DC voltage is converted into a three-phase AC by switching the transistors ON.
Stator windings u ₁ −v ₁ , v ₁ −w ₁ , w _{1 of the} electric motor 14
A current is sequentially applied to −u ₁ to rotate the electric motor 14 in one direction (for example, forward rotation). The electric motor 1
The forward and reverse rotations of 4 may be performed by reversing the order of the currents flowing through the stator windings u ₁ , v ₁ and w _{1. The} forward and reverse control is performed from the controller 20 through the signal line to the distributor. By the forward / reverse rotation instruction signal sent to 17, the distributor 1
Via 7. Further, a ₉ is a constant voltage power supply Vcc
Is a connection terminal for fixing a connection line d (which determines the type of the electric motor connected to the connector 16) connecting the controller 20 and the controller 20 described later. In addition, as shown in FIG.
In the electric motor 14, the connection line d is wired between the connector 16 and the controller 20, but since the controller 20 is not energized by using this connection line d, the connection line d becomes 0V state. ing.

Reference numeral 18 shown in FIG. 1 is a current which is inserted and connected between the DC power supply 11 and the inverter circuit 12 to detect a current flowing through each phase stator winding u ₁ , v ₁ , w ₁ of the motor 14. It is a detection resistor. Reference numeral 19 is a low-pass filter that smoothes the current detected by the current detection resistor 18, and the current smoothed by this low-pass filter 19 and averaged to an average current value is input to the controller 20. The controller 20 outputs a command signal for driving control (voltage control or the like) of the electric motor 14 according to the command voltage corresponding to the input current value.

Next, the function of the controller 20 (program setting for operating the controller) will be described. The controller 20 is preliminarily set with the following programs. (1), a function of converting an input current value from an analog signal to a digital signal (2), a voltage value corresponding to the input current value is programmed in advance, and by referring to it, the A / D converted input A function that converts the current value to a corresponding voltage value and outputs it as a command voltage (3), a function that converts the command voltage from a digital signal to an analog signal (4), and when the input current value is low, A function that outputs a command voltage that lowers the voltage value to a preset value and shortens its output time (energization period) (5). When the input current value is high, the preset value of the voltage value is set. To output a command voltage that increases the output time (energization period) of the command voltage (6), and to set the upper limit of the command voltage to limit the output time and prevent overvoltage application (7). Connector When detecting an input voltage from 16,
A function of determining the type of the electric motor corresponding to the input voltage (8), and a function of outputting a command voltage based on the input current value in accordance with the program corresponding to the determined electric motor when the type of the electric motor is determined ( 9), a function of outputting an instruction signal for rotating the electric motor in the forward and reverse directions based on the input signal from the operating means 21.

Reference numeral 22 shown in FIG. 1 is a control means for outputting a signal for controlling the voltage applied to the electric motor 14 in accordance with the command voltage output from the controller 20, which is a triangular wave generating circuit (pulse) for outputting the triangular wave signal Vx. The width modulation signal generation circuit) 23 is compared with the command voltage Vs output from the controller 20, and when the triangular wave signal Vx is lower than the command voltage Vs, the pulse width modulation signal of “L” level (hereinafter, PWM signal). Is output to the distributor 17. When the output terminal of the comparator 24 reaches the "L" level, a PWM signal with a variable on / off duty is output, and this PW
The M signal is logically converted by the distributor 17 and sent to the three transistors x, y, z of the lower arm of the inverter circuit 12, and the number of revolutions of the electric motor 14 is changed by changing the ON period. That is, the shorter the on-duty of the transistors x, y, z of the inverter circuit 12, for example, the lower the rotation speed of the electric motor 14.

Continuing on, in FIG.
Instead of this, for example, a brush-equipped DC motor (hereinafter referred to as DC motor) 25 is installed at the output end of the inverter circuit 12 and its drive control is performed. In this case, the DC motor 25
Is a single phase, the DC motor 25 is connected to the connection terminals a ₁ and a ₂ of the connector 16 via lead wires. on the other hand,
The connection terminals a ₁ and a ₂ are connected to the U-phase and V-phase output terminals of the inverter circuit 12 via the power supply lines b ₁ and b ₂ .
Therefore, the DC motor 25 is connected to U, V of the inverter circuit 12.
Since only the phases are connected and the three-phase full-wave bridge portion is not converted to the three-phase AC, the DC motor 25 is rotated by being supplied with a DC voltage when it is driven.

Further, in the distributor 17 for controlling the drive of the inverter circuit 12, the input end thereof controls ON / OFF of only the U and V phases of the inverter circuit 12 when the DC motor 25 is used, Connection terminals a _{6 to} a ₈
Is connected using the signal lines c ₁ , c ₂ and c ₃ , but the signal line c ₂ connected to the connection terminal a ₇ is only grounded via the connection line e, so the distributor 17 There is no signal (information) input from the connector 16 side.

Therefore, when the input terminal (V phase) of the distributor 17 connected to the signal line c ₂ via the terminal a ₇ is grounded by the connection line e, the case where the distributor 17 itself connects the electric motor 14 Differently, rotor position detection sensors Hu, Hv, Hw
When the rotational position detection signal from is not input, the logic conversion is performed, and it is recognized that the DC motor 25 is connected to the inverter circuit 12 instead of the motor 14, and the distributor 17 thereby recognizes that the DC motor 25 is connected to the inverter circuit 12. A drive control signal for turning on only the transistor u and the transistor y on the lower arm is output to the inverter circuit 12, and the transistors u and y are switched on to output a direct current to the direct current motor 2.
5 is energized and is driven to rotate in one direction (for example, forward rotation).

In FIG. 2, reference numeral f denotes a power supply line connecting the constant voltage power supply Vcc and the connection line d via the connection terminal a ₉ , and the constant voltage power supply Vcc is input to the controller 20 through the power supply line f and the connection line d. Then, the controller 20 determines that the DC motor 25 is connected to the connector 16,
The command signal from the controller 20 is changed from the electric motor 14 to the DC electric motor 25.

That is, in order to individually control the drive of the electric motor 14 and the DC electric motor 25, the controller 20 flows when the electric motor 14 and the DC electric motor 25 are driven, respectively. Program individually the voltage value corresponding to the input current value,
The input current value is converted into each corresponding voltage value and output from the controller 20 as a command voltage for the electric motor 14 or the DC electric motor 25.

Next, the operation of the drive control device will be described. As described above, the drive control device A of the present invention includes the inverter circuit 12 that controls the energization of the electric motors 14 and 25.
And a distributor 17 for sending to the inverter circuit 12 a drive control signal logically converted to the inverter circuit 12 based on information from the electric motors 14 and 25, and the inverter circuit 1
2 detects the current value input to 2, and presets the voltage value corresponding to this current value, and when the current value is detected, outputs the voltage corresponding to the current value as the command voltage. The controller 20 compares the command voltage output from the controller 20 with the triangular wave signal provided from the triangular wave generation circuit 23, and outputs a PWM signal of "L" level when the triangular wave signal Vx is lower than the command voltage Vs. Control means 22 for sending this to the distributor 17, and further,
In the inverter circuit 12 and the distributor 17, the electric motors 14, 2
5 are individually connected to each other, and the connector 16 enables drive control by the drive control device A.

A case in which the electric motor 14 is connected to the connector 16 as shown in FIG. 1 and the drive of the electric motor 14 is controlled will be described. In this case, each of the electric motor 14 and the DC electric motor 25 is a motor having a characteristic of generating a voltage (induced voltage) proportional to the rotation speed and a torque proportional to an input current. Therefore, as shown in FIG. 9, when a constant voltage is applied for driving, the rotation speed drops with a constant slope as the load torque increases, while if the torque is the same, the rotation speed also increases as the applied voltage increases. Has the property of (Refer to the part shown by the solid line (A) in FIG. 9).

When the drive controller A controls the drive of the electric motor 14, as shown in FIG. 1, the stator windings u ₁ , v ₁ and w ₁ are connected to the connection terminals a _{1 to} a ₃ of the connector 16, respectively. Rotor position detection sensors Hu, Hv, H are connected to the connection terminals a _{6 to} a _8.
The electric motor 14 is connected to the inverter circuit 12 and the distributor 17 by connecting w using the signal lines c _{1 to} c ₃ , respectively. When the operating means 21 is operated in this state to energize the electric motor 14, rotational position detection signals from the rotor position detection sensors Hu, Hv, Hw are sent from the electric motor 14 to the distributor 17 and logically converted, When the drive control signal is output to the inverter circuit 12, the signal causes the inverter circuit 12 to follow the order shown in the time chart shown in FIG. 4 for the upper-arm transistor u and the lower-arm transistor y, hereinafter transistors u · z, vz, v
The DC voltage from the DC power supply 11 is converted into the three-phase AC by the motor 14 via the inverter circuit 12 by sequentially turning on the transistors x to w in the order of x, w, x, w and y. Is energized.

As a result, the stator winding u _1-of the electric motor 14
An alternating current sequentially flows through v ₁ , v ₁ -w ₁ and w ₁ -u ₁ --- to rotate the rotor 15 in a predetermined direction. Electric motor 14
When current is applied to the stator windings u ₁ , v ₁ , w ₁ of
The current value associated with the energization is sequentially detected by the controller 20. When the current value corresponds to the voltage value corresponding to the current value preset in the controller 20, the voltage value is used as the command voltage Vs from the output end of the controller 20 to the non-inverting input end of the comparator 24. Is output to. Then, this command voltage Vs is compared with the triangular wave signal Vx input to the inverting input terminal of the comparator 24, and when the triangular wave signal Vx falls below the command voltage Vs,
The output terminal of the comparator 24 becomes "L" level and PW
It outputs the M signal and sends it to the distributor 17.

The distributor 17 logically converts the PWM signal into the transistors x,
Controlling the electric motor 14 by changing the ON period of the transistors x, y, z, which are sent to y, z, according to the current flowing in the stator windings u ₁ , v ₁ , w ₁ of the electric motor 14. Is. The command voltage Vs output from the controller 20 is determined as the command voltage Vs of the electric motor 14 because the controller 20 has determined in advance the electric motor 14 because the connection line d is not connected to the constant voltage power supply Vcc. It goes without saying that it is output (Figs. 1 and 3,
4).

As described above, the rotation of the electric motor 14 activates the bed apparatus for the physically handicapped person using the electric motor 14, for example. In this case, it is used when the floor of the bed is raised by the forward rotation of the electric motor 14.
And if you want to lower your bet in reverse,
The electric motor 14 may be rotated in the reverse direction. When the electric motor 14 is rotated in the reverse direction, the operating means 21 is operated in a direction in which the electric motor 14 rotates in the reverse direction.
An instruction signal for rotating the electric motor 14 in the reverse direction is output to 7.
The instruction signal is logically converted by the distributor 17, and the electric motor 1
A drive control signal for rotating 4 in reverse is output to the inverter circuit 12.

That is, based on the reverse rotation command to the inverter circuit 12, the upper and lower transistors u to z of the inverter circuit 12 are energized in the order shown in FIG. That is, in FIGS. 5 and 6, the upper arm transistor v and the lower arm transistor x of the inverter circuit 12, the transistors w.x, w.y, u.y,
The stator windings v ₁ -u ₁ , u ₁ -w ₁ , w ₁ -v _{1 of} the electric motor 14 are turned on in the order of u · z and v · z.
The current is sequentially applied to the rotor 15 to rotate the rotor 15 in the reverse rotation direction. As the rotor 15 rotates, the command voltage Vs output from the controller 20 is compared with the triangular wave signal Vx based on the current value input to the inverter circuit 12, and V
When x <Vs, the speed control means 22 sends a PWM signal to the distributor 17, and the PWM signal is logically converted by the distributor 17 and sent to the inverter circuit 12, where the three transistors u, The number of revolutions of the electric motor 14 is changed by changing the ON periods of v and w.

The reverse rotation of the electric motor 14 lowers the floor of the bed apparatus using the electric motor 14. When the electric motor 14 is rotated in the reverse direction to lower the floor of the bed apparatus, for example, the electric motor 14 can be rotated with a light load by appropriately receiving the weight of the floor of the bed apparatus. On the other hand, when raising the floor, the weight of the floor must be overcome to raise the floor, so that the electric motor 14 receives a great load during its rotation. As a result, when the floor of the bed apparatus is raised and when it is lowered, the load applied to the electric motor 14 is different, so that the electric motor 14 has a lower rotation speed when the floor is raised,
On the contrary, there was a problem that the number of revolutions increased when descending.
That is, it has been difficult to perform the raising / lowering operation of the bed apparatus in a certain time.

However, the electric motor (DC brushless) 14
As described above and as shown in FIG. 9, the rotational speed drops with a constant inclination as the load torque increases when driven at a constant voltage, and the rotational speed also increases when the drive voltage increases (no load is applied). If the speed increases in proportion to the voltage). As a result, in order to set the rotation speeds at the rated load and the no load to be substantially constant (the setting rotation speed N _{0 in} FIG. 9), the setting rotation speed N ₀ is maintained when the input current value is small. (When the energization time is shortened), conversely, when the rotation speed drops due to a load, the drive voltage is increased (the energization time is lengthened) to maintain the set rotation speed N ₀ .

Therefore, for example, as shown in FIG. 9, the solid line (B)
In the relationship between the torque T and the rotation speed N of the electric motor,
Now, in raising the rotational speed to the set rotational speed N ₀ is B ₁ point, as indicated by arrows horizontally from B ₁ point, by pulling the drive voltage V _1, at a predetermined set rotational speed N _0, 9 As shown by the dotted line, it becomes possible to maintain the rotation speed of the electric motor 14 at the set rotation speed N ₀ in a state where the torque is increased (in this case, the voltage shown by the dotted line is higher than the voltage shown by the solid line (B) by V ₁ will be increased voltage).
Further, in order to increase the rotation speed to the set rotation speed N ₀ at the point B ₂ , the drive voltage may be increased by V ₂ . Again,
By the voltage increased by V ₂ from the voltage shown by the solid line (B) in FIG. 9 (shown by the one-dot chain line in FIG. 9), the torque at the B ₂ point can be obtained at the set rotation speed N _0. .

Thus, the number of revolutions (speed) of the electric motor 14
In order to maintain the rotation speed at a preset value,
As described above, the current value input to the inverter circuit 12 is detected while the electric motor 14 is rotating, and a command corresponding to the voltage value corresponding to the preset current value is detected based on the detected current value. The voltage is output from the controller 20 via the control means 22 as a PWM signal to the distributor 17,
By changing the ON period of each of the transistors u to z of the upper and lower arms of the inverter circuit 12 by the distributor 17, the rotation speed of the electric motor 14 is set to the set rotation speed N ₀ shown in FIG.
Can be maintained. Therefore, when the electric motor 14 is used as a drive source of a lifting device for a bed, a hanging cabinet, and a lifting device for an electric chair, there is an advantage that it can be moved with the same torque when lifting a used member.

Next, a case where the DC motor 25 is connected to the connector 16 and drive control is performed by the drive control device A will be described. In FIG. 2, the DC motor 25 is a connector 16
U and V of the inverter circuit 12 via the terminals a ₁ and a ₂ of
Connect with the phase. The distributor 17 grounds the V phase at the connection line e. Further, the constant voltage power supply Vcc and the connection line d are connected via a power supply line f to supply the controller 20 with the constant voltage power supply Vcc. As a result, the controller 20 determines that the DC motor 25 is connected to the connector 16 by being supplied with the constant voltage power supply Vcc through the power supply line f and the connection line d, and the controller 20 determines from the output end thereof. Outputs a signal for driving and controlling the DC motor 25 to the distributor 17.

When the DC electric motor 25 is driven, the rotational position detection signals from the rotor position detection sensors Hu, Hv, Hw are not input to the distributor 17 like the electric motor 14, so the distributor 17 recognizes this and logic. A drive control signal that is converted and turns on only the transistors u and y of the inverter circuit 12 is output, the DC power supply 11 is fed from the inverter circuit 12 to the DC motor 25, and this is rotated in the forward direction, for example (FIG. 7, Refer to the case of positive rotation of 8.). The current value supplied to the DC motor 25 due to the rotation of the DC motor 25 is detected by the controller 20 as in the case of the motor 14, and based on this current value, the voltage value (previously set) corresponding to the preset current value ( A command voltage Vs corresponding to the DC motor 25 only) is output from the controller 20, the command voltage Vs and the triangular wave signal Vx are compared by the comparator 24, and when the output terminal of the comparator 24 is at the “L” level. The PWM signal is output to the distributor 17.

The distributor 17 logically converts the PWM signal and varies the ON period of the transistor y of the inverter circuit 12 to control the speed of the DC motor 25. The DC motor 25 is used as a drive source with a relatively low torque, and may be used, for example, when the back and lower floors of a bed are tilted in the vertical direction, or when the back plate of an electric chair is tilted. .

When the DC motor 25 is rotated in the reverse direction,
Similar to the case of the electric motor 14, the operation means 21 is operated to output the reverse rotation instruction signal from the controller 20 to the distributor 17. The distributor 17 is logically converted based on the instruction signal, outputs a drive control signal for turning on only the transistors v and x of the inverter circuit 12, supplies a direct current to the direct current motor 25, and reversely rotates it. Since the speed control of the electric motor 25 is performed based on the current value supplied to the electric motor 25 as described above, the description is omitted because it is the same as the case of the forward rotation.

Further, when the DC motor 25 is rotated at the set rotational speed N ₀ shown in FIG. 9, the explanation is omitted because it is the same as the case described for the motor 14, but the description is omitted. When the current values input to the inverter circuit 12 being energized are detected, the voltage values 25 are set in advance in the voltage values corresponding to the respective current values individually and are programmed in the controller 20. This is because the both electric motors 14 and 25 have a characteristic of generating a voltage proportional to the rotation speed and a torque proportional to the input current.

In the present invention, an example in which the electric motor 14 and the DC electric motor 25 are connected to the connector 16 each time they are used for drive control has been described, but the present invention is not limited to this, and as shown in FIG. Insert the motor 14, the DC motor 25, and the inverter circuit 12 such as a relay.
Connection is made by using the breaking means R ₁ and R _2, and when controlling the electric motor 14, R ₂ is turned on, and in the case of the DC electric motor 25, R
Both electric motors 14 and 25 may be individually controlled by turning ₁ on. In this case, it is natural that the inverter circuit 12 and the electric motors 14 and 25 are connected via a connector (not shown). Also, DC motor 2
When controlling 5, the connection line e and the power supply line f are respectively provided with switch means (not shown) that enables connection only when the DC motor 25 is used, so as not to hinder the use of the motor 14. It is natural to do so.

Furthermore, a desired resistance is inserted in the power supply line f, and the voltage supplied to the controller 20 is varied according to the voltage division ratio with the resistance grounded to the connection line d, so that a plurality of winding resistance values are different. The present invention can be realized even if the DC motors can be individually driven and controlled.

[0046]

Since the present invention is constructed as described above, it has the following effects. (1) According to the present invention, a connector is inserted between an inverter circuit and an electric motor, a different electric motor can be connected to the inverter circuit via the connector, and the electric motor is provided as a distributor for driving and controlling the inverter circuit. When the rotational position detection signal is input, the controller determines that the DC brushless motor is connected to the inverter circuit, the distributor is simply grounded, and when the constant voltage power is input to the controller, the DC motor is the inverter circuit. Data to output the voltage value corresponding to the current input to the inverter circuit when the both motors are driven in advance from the controller (voltage value)
Is programmed individually, DC brushless motor and DC motor, even if the model of the motor is different,
Since both motors have a characteristic of generating a voltage proportional to the rotation speed and generating a torque proportional to the input current, one drive can be driven based on the output information from the motor and the control information from the controller. The control device is convenient because the DC brushless motor and the DC motor can be controlled individually and easily.

(2) Moreover, since the DC brushless motor and the DC motor have the common characteristics as described above,
The controller presets the voltage value corresponding to the current input to the inverter circuit,
Moreover, based on the input current, when the average value of the command voltage is lower than the preset average value, the energization period to the inverter circuit is shortened, and conversely, when the average value is high, the energization period to the inverter circuit is lengthened. The program is set in the controller so that the applied voltage that is equivalently applied to the inverter circuit can be controlled in advance, so the motor can always rotate at a predetermined set speed regardless of load fluctuations. When the load changes at the place where the motor is used, for example, even when the load is large when rising, and when the load is light due to the use of its own weight, there is an advantage that the lifting operation can be performed at a uniform speed. Combined with the effect that one control device can control a plurality of different types of electric motors, there is also an advantage that load fluctuations due to members used can be favorably improved.

(3) Furthermore, the DC brushless motor and the DC motor are connected since the connection to the inverter circuit is changed in the wiring connection through the connector only between the three-phase and the single-phase. It can be done easily without making a difference.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of essential parts showing an example in which a drive control device of the present invention is applied to a DC brushless motor.

FIG. 2 is a circuit diagram of essential parts showing an example in which the present invention is applied to a DC motor.

FIG. 3 is an explanatory diagram illustrating a sequence of energizing the inverter circuit when the DC brushless electric motor is normally rotated.

FIG. 4 is a control timing chart of the inverter circuit when the DC brushless electric motor is normally rotated.

FIG. 5 is an explanatory diagram illustrating a sequence of energizing the inverter circuit when the DC brushless motor is rotated in the reverse direction.

FIG. 6 is a control timing chart of the inverter circuit when the DC brushless motor is rotated in the reverse direction.

FIG. 7 is an explanatory diagram illustrating a sequence of energizing the inverter circuit when the direct-current motor is rotated forward and backward.

FIG. 8 is a control timing chart of the inverter circuit when the DC motor is rotated in the forward and reverse directions.

FIG. 9 is an explanatory diagram illustrating a relationship between torque and rotation speed of an electric motor.

FIG. 10 is a connection diagram of an electric motor and an inverter circuit according to another embodiment of the present invention.

FIG. 11 is a circuit diagram schematically showing a drive control state of a conventional DC brushless electric motor.

FIG. 12 is a circuit diagram schematically showing an example of drive control of a conventional DC motor.

[Explanation of symbols]

12 inverter circuit 14 DC brushless motor 16 connector 17 distributor 20 controller 21 operation unit 22 control unit 24 comparator 25 direct-current motor a ₁ ~a ₉ connecting terminals b ₁ ~b _3, f feed line c ₁ to c ₃ signal line d, Connection line

Front page continued (72) Inventor Toru Yasuda 1 Aichi-cho, Kasugai-shi, Aichi Aichi Electric Co., Ltd.

Claims (3)

[Claims] 1. A connector which is arranged between an inverter circuit and a required electric motor driven by an output from the inverter circuit and which connects the inverter circuit and the required electric motor through a power supply line, and a connector of the connector. On the other hand, a distributor connected to signal output means for outputting a predetermined signal from the electric motor and outputting a drive control signal to the inverter circuit, and an input current of the inverter circuit are detected, and a command voltage corresponding to this current value is required in advance. Controller for setting and outputting a program for each electric motor, and control means for comparing the command voltage from the controller and the triangular wave signal and outputting a pulse width modulation signal for controlling the energization time of the inverter circuit and sending it to the distributor. And a drive control device for an electric motor. 2. The required electric motor is a DC brushless electric motor, and this DC brushless electric motor is connected to an inverter circuit through a connector with a three-phase feed line to output a rotational position detection signal of a rotor. The sensor is
When connecting to the distributor via a signal line via the connector and the rotational position detection signal is input to this distributor, the controller determines that the DC brushless motor is connected to the inverter circuit and controls the DC brushless motor to be drivable. The drive control device for the electric motor according to claim 1, wherein 3. The required electric motor is a DC electric motor,
This DC motor is connected to the inverter circuit through one of the connectors through a power supply line in a single phase, and the other end of the connector is grounded to the required input end of the distributor, and the constant voltage power supply and the controller are connected to the required resistance. And the like, and when the required voltage is supplied to the controller, the controller determines that the DC motor is connected to the inverter circuit and controls the DC motor so that it can be driven. Item 1. A drive control device for an electric motor according to item 1.