JP2016023997A - Dummy load torque generator of rotary-electromotor torque test machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively provide a small generator for generating a dummy load torque to a rotary electromotor.SOLUTION: The generator includes a power generation unit connected, via a torque detector, to a power transmission shaft of a rotary electromotor to be measured; a power consumption unit; a power consumption control unit; and a load torque setting unit for setting a desired load torque. An actual torque detected by the torque detector is compared with the previously set load torque, a command corresponding to the difference is issued to the power consumption control unit, power is consumed by the power consumption unit, and the load torque applied to the rotary electromotor to be measured is controlled.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pseudo load torque generator that artificially applies a load torque to a rotary motor in a torque characteristic test of the rotary motor.

Conventionally, as a technique for giving a load torque in a pseudo manner in a torque characteristic test of a rotary motor, it is common to provide a brake on the power transmission shaft of the rotary motor to be measured. Examples of such a brake include a friction brake that obtains a braking force by a frictional force generated by a brake shoe, an electromagnetic powder brake in which magnetic powder (powder) is sealed between a driving portion and a driven portion, and Patent Document 1 The disclosed hysteresis brake that generates load loss and generates a hysteresis loss, and further, in Patent Document 2, another rotating motor is driven by the rotating operation of the rotating motor to be measured to perform a power generation operation (equivalent to a generator). In addition, a power generation brake for applying a load torque is disclosed.

Japanese Patent Laid-Open No. 61-111433 Japanese Patent Laid-Open No. 3-212194

However, in friction brakes and electromagnetic powder brakes, the temperature of the rotating motor to be measured rises due to frictional heat generated, and a stable braking force cannot be obtained when continuously used, resulting in the application of a desired load torque. I couldn't. In addition, with the hysteresis brake, the load torque that can be applied is small relative to the size of the device, and when the load torque to be applied is large, the overall size of the testing machine becomes large and unusable, and excitation is also performed during low-speed rotation. There is a problem that residual torque is generated when it is cut.

On the other hand, in the power generation brake, electric power generated by the power generation operation is consumed as heat energy by electric resistance, and a braking torque is obtained to generate load torque. In this case, use at a high speed rotation that generates a large amount of power requires an electric resistance that can consume a large amount of power, and it is also necessary to use a variable resistance to change the load torque. It had to be a composition. Furthermore, it is not suitable for improving the test accuracy by making the load torque correspond to the desired magnitude with high accuracy.

An object of the present invention is to provide a pseudo load torque generator capable of applying various load torques in a high-speed rotation operation of a rotating electric motor to be measured, in a small size and at a low cost.

In order to solve the above-described problem in the present invention, a pseudo load torque generator according to an embodiment includes a torque detector that detects torque by twisting a shaft,
A power generation unit connected to the power transmission shaft of the rotating motor to be measured via the torque detector;
A power consuming unit that consumes the power generated by the power generation unit;
A power consumption control unit for controlling power consumption in the power consumption unit;
A load torque setting unit for setting a load torque to be applied to the rotary electric motor to be measured;
The load torque setting unit compares the actual torque detected by the torque detector with a preset load torque, and gives a command to the power consumption control unit according to the difference,
The power consumption control unit sets a control amount corresponding to the command in the power consumption unit,
The power generated by the generator is consumed, and the load torque applied to the rotating motor to be measured is controlled.

According to the present invention, even when the rotary electric motor to be measured performs a high-speed rotation operation, it is possible to provide a stable load torque at a low cost without increasing the size of the apparatus.

It is a block diagram which shows 1st embodiment of the pseudo load torque generator of this invention, and a to-be-measured rotary electric motor. It is an Example figure of the to-be-measured electric motor with which the hysteresis brake was attached. It is an Example figure which carries out a power generation driving | operation as a power generation brake by making another rotation motor follow by a to-be-measured rotation motor. It is a block diagram which shows 2nd embodiment of the pseudo load torque generator of this invention, and a to-be-measured rotary electric motor.

A detailed description of the embodiment will be given below based on the drawings.

FIG. 1 is a block diagram showing a first embodiment of the present invention. In FIG. 1, the pseudo load torque generator 1 and the rotary electric motor M to be measured are connected to the power transmission shaft Ms of the rotary electric machine M to be measured via the drive side coupling 4. On the other hand, in the pseudo load torque generator 1, the drive side coupling 4 and one rotating shaft of the torque detector 3 are connected, and the driven side coupling 5 is connected to the other rotating shaft of the torque detector 3. The rotating shaft of the brushless DC motor 2 (power generation unit) is connected through the via.

The rotary electric motor M to be measured is supplied with electric power from the power source P, is speed controlled by the drive control unit Dv, and is driven at a predetermined rotational speed. Here, the brushless DC motor 2 driven by the measured rotary motor M acts as a generator, and acts as a so-called power generation brake that applies load torque to the measured rotary motor M. The load torque amount to be applied is controlled by controlling the current amount of the collector current Ic flowing between the collector C and the emitter E of the power transistor 11 provided in the power consumption unit 10 to which the brushless DC motor 2 is connected. Will be described later.

On the other hand, in the torque detector 3, since the brushless DC motor 2 acts as a brake on the rotating motor M to be measured during the rotation operation, the shaft connected to the driving side coupling 4 and the driven side coupling 5 are connected. Torsion occurs with the generated shaft, and the actual torque generated there is detected and output to the load torque setting unit 30.

In the load torque setting unit 30, a voltage indicating the actual torque detected by the torque detector 3 is differentially input to the detected torque input unit 31 and amplified. Subsequently, the actual torque voltage amplified by the detected torque input unit 31 by the load torque control amount calculation unit 32 and the input device such as a key and a switch by the set load torque input unit 34 are applied in advance to the rotary electric motor M to be measured. Compared with the voltage indicating the set load torque to be set, a necessary control amount is calculated according to the difference and output to the reference voltage generator 33. The reference voltage generator 33 generates a reference voltage Vref to be output to the power consumption control unit 20 based on the input control amount.

In the power consumption control unit 20, the reference voltage Vref is input to the + terminal side of the controlled variable amplifier 22. Here, since the voltage Vs applied to the current detection resistor 21 is input to the negative input terminal side of the control amount amplifier 22, the output of the control amount amplifier 22 is small when Vs> Vref, and when Vs <Vref. It is controlled to become large.

Vs is determined by the collector current Ic flowing between the collector C and the emitter E of the power transistor 11 and the resistance value Rs of the current detection resistor 21 in the power consumption unit 10 (Vs = Ic × Rs). Since the transistor amplifying action is used, the collector current Ic is controlled by the base current Ib flowing between the base B and the emitter E.

The base current Ib is a current that flows between the base B and the emitter E of the power transistor 11 through the power transistor driver 12 through the output of the controlled variable amplifier 22 and is finally controlled to be Vs = Vref. Become.

Therefore, the load torque to be applied to the rotary motor M to be measured is determined by consuming the power generated by the brushless DC motor 2 acting as a power generation brake by the collector current Ic flowing between the collector C and the emitter E of the power transistor 11. The consumption amount can be controlled by setting the reference voltage Vref input to the control amount amplifier 22 according to the difference between the actual torque detected by the torque detector 3 and the desired load torque.

FIG. 4 is a block diagram showing a second embodiment of the present invention. In FIG. 4, the pseudo load torque generator 100 and the measured rotary motor M are coupled to the power transmission shaft Ms of the measured rotary motor M via the drive side coupling 4 as in the first embodiment. Further, in the apparatus of the pseudo load torque generator 100, the drive side coupling 4 and one rotating shaft of the torque detector 3 are connected, and the other rotating shaft of the torque detector 3 is connected to the DC generator 102 (power generation). Part) is directly attached.

The rotary electric motor M to be measured is supplied with electric power from the power source P, is speed-controlled by the drive control unit Dv, is driven at a predetermined rotational speed, and the DC generator 102 driven by the rotary electric motor M to be measured via the torque detector 3 is Acts as a power generation brake and applies load torque. The load torque amount to be applied is controlled by controlling the current amount of the collector current Ic flowing between the collector C and the emitter E of the power transistor 11 in the power consuming unit 10 as in the first embodiment.

At this time, in the torque detector 3, since the DC generator 102 acts as a brake on the rotating motor M to be measured during the rotation operation, the shaft connected to the drive side coupling 4 and the DC generator 102 are Torsion occurs between the attached opposite shafts, and the actual torque detected there is output to the load torque setting unit 300.

In the load torque setting unit 300, a voltage indicating the actual torque detected by the torque detector 3 is amplified by the detection torque amplifier 301 and input to the −input terminal side of the control amount amplifier 200. Also. A load torque control amount setting unit 302 composed of a variable DC power supply sets a voltage corresponding to a desired load torque and inputs it as a reference voltage Vref to the + terminal side of the control amount amplifier 22.

The control amount comparator 200 (power consumption control unit) compares the amplified voltage indicating the actual torque with the voltage corresponding to the desired load torque, amplifies the voltage proportional to the difference, and outputs the amplified voltage to the power consumption unit 10. To do.

In the power consuming unit 10, the output of the controlled variable amplifier 200 is connected to the base B of the power transistor 11 via the power transistor driver 12, and controls the base current Ib flowing between the base B and the emitter E. Therefore, the current Ic flowing between the collector C and the emitter E due to the amplification action of the power transistor 11 can be controlled.

Therefore, in this embodiment as well, as in the first embodiment, the load torque applied to the rotary electric motor M to be measured is obtained by using the power generated by the DC generator 102 acting as a power generation brake to the collector of the power transistor 11. C is performed by consuming the collector current Ic flowing between the emitters E, and the consumption can be controlled according to the difference between the actual torque detected by the torque detector 3 and the desired load torque.

Therefore, the pseudo load torque generator according to the present embodiment compares the load torque applied to the rotating motor to be measured with the actual torque detected by the torque detector and the desired load torque, and is consumed by the power transistor due to the difference. Therefore, it can be applied accurately and stably without change due to temperature rise. Further, since it is possible to easily change the desired load torque, it is possible to easily apply various load torques. Furthermore, by using a brushless DC motor or DC generator capable of high-speed rotation, a large amount of the generated power can be consumed by the amplification function of the transistor, and it can be realized in a small size and at low cost suitable for high-speed rotation operation. It becomes.

In the above, the present invention has been described in detail with respect to specific embodiments. However, the present invention is not limited thereto, and various embodiments are possible within the scope of the present invention. For example, in the above embodiment, it is easy to replace the power transistor with an active element such as an FET or a thyristor. Moreover, although the brushless direct current motor and the direct current generator are used as the power generation brake for generating the load torque, the alternating current generator or the alternating current motor may be provided with an inverter.

DESCRIPTION OF SYMBOLS 1,100 Load torque generator 2 DC motor (electric power generation part) 3 Torque detector 4 Drive side coupling 5 Driven side coupling 10 Power consumption part 11 Power transistor (active element) 12 Power transistor driver 20 Power consumption control part 21 Current detection resistor 22 Control amount amplifier 30 Load setting unit 31 Detection torque input unit 32 Load torque control amount calculation unit 33 Reference voltage generator 34 Setting load input unit 102 DC generator 200 Control amount comparator 300 Load torque setting unit 301 Detection Torque amplifier 302 Load torque control amount setting unit M Rotating motor to be measured Ms Power transmission shaft P Power source for rotating motor to be measured Dv Drive control unit

Claims (5)

A pseudo load torque generator in a performance measuring machine of a rotary motor,
A torque detector that detects torque by twisting the shaft;
A power generation unit connected to the power transmission shaft of the rotating motor to be measured via the torque detector;
A power consuming unit that consumes the power generated by the power generation unit;
A power consumption control unit for controlling power consumption in the power consumption unit;
A load torque setting unit for setting a load torque to be applied to the rotary electric motor to be measured;
The load torque setting unit compares the actual torque detected by the torque detector with a preset load torque, and gives a command to the power consumption control unit according to the difference,
The power consumption control unit causes the power consumption unit to consume the power generated by the power generation unit by setting a control amount in accordance with the command in the power consumption unit, and a load torque to be applied to the rotating motor to be measured. A pseudo load torque generator characterized by controlling. The pseudo load torque generator according to claim 1, wherein the power generation unit causes a DC brushless motor to act as a generator. The pseudo load torque generator according to claim 1, wherein the power generation unit is a DC generator. The pseudo load torque generator according to claim 1, wherein the power consuming unit consumes the power by an amplification action of an active element. The pseudo load torque generator according to claim 4, wherein the active element is a power transistor.