Temperature controller power unit of a vehicle

 

The invention relates to the field of automatic system of temperature regulation in cooling systems of power plants vehicles. Temperature controller power unit of a vehicle includes a power source AC, the governing body, induction motor and cooling fan. The regulator has applied the same two asynchronous motor with slip-ring rotor, the stator windings are connected to a power source, the rotor windings are connected in series with resistors and a shaft connected with the shaft of the cooling fan. The stator of one of the asynchronous motors are pivoted and connected to the rotation mechanism connected to the control authority. The invention provides improved efficiency and reliability regulator. 4 Il.

The temperature controller relates to the transport industry, in particular to the field of automatic system of temperature regulation (vysokonogoye parts, oil water, charge air, and other heat engines, the windings of electrical machines, transformers, bound vehicles (locomotives, cars, tractors and other).

Any automatic system contains two functional parts: the object of regulation and automatic control [1]. Any automatic regulator has two main series-connected functional parts: the governing body and Executive-regulating device. In turn, a regulating device contains two functional parts: the actuator and the regulatory body [2, 3]. Automatic temperature controls, containing as the governing body of the cooling fan, the function of the actuator performs the fan drive [2, 3]. Known automatic temperature controls electric fan AC contain a power source (usually a traction generator or auxiliary generator). Known automatic temperature controls energy installations vehicles with electric fan motor AC three species. Automatic temperature controls of the first type contain a power source that is connected to the frequency Converter (usually containing a DC link rectifier), with whom entilator. The temperature Converter connected to the governing body that manages them according to the temperature of the coolant in the cooling system of power plant of the vehicle [1, 3, 4]. In electric fan drive such an automatic temperature controller implements the principle of frequency control of an induction motor [6, 8]. Automatic temperature controls of the second type contain a power source that is connected to the Converter phase voltage connected to the stator windings of a special asynchronous motor with two-layer (or dwuhvalentnam) a rotor connected to the shaft of the fan. To the inverter phase voltage connected to the governing body, the governing them on the temperature of the power plant of the vehicle. In electric drive cooling fan of such automatic temperature controller to implement the principle of phase control of an induction motor with two-layer (or dwuhvalentnam) rotor [5, 7]. Automatic temperature controllers of the third kind contain a power source that is connected to the stator winding of an induction motor with squirrel-cage rotor connected to the shaft ventilate the Mering body, managing them according to the temperature of the power plant of the vehicle [3, 8, 9]. Known automatic temperature controllers power plant of the vehicle have significant shortcomings. In automatic temperature controllers with frequency-controlled asynchronous motor cooling fan must be applied to the frequency converters certain dimensions, mass and cost at full capacity induction motor. It also reduces the reliability of the automatic temperature controller. When the frequency control of induction motor with fan load, its efficiency is reduced due to nonsinusoidal supply voltage, especially at partial loads. In automatic temperature controllers with phase control asynchronous motor with two-layer (or dwuhvalentnam) rotor requires the use of the Converter phase voltage of certain dimensions, mass and cost. It also reduces the reliability of the automatic temperature controller. When the phase control of an induction motor with fan load efficiency of an electric drive is significantly reduced when the rotation speed decreases Venta 30-40% less than the nominal capacity of such asynchronous motor with squirrel-cage rotor. In automatic temperature controllers with electric fan variable supply requires the use of the mechanism of rotation of the blades, which complicates the controller design. The mechanism of rotation of the blades increases the size and weight of the cooling fan, as well as the cost of the fan and controller. In addition, with this method changes the supply fan induction motor has a rotational speed proportional to the rotation frequency of the supply voltage, which may be constant or may vary in a small range, which leads to the small thermal load of the cooling system of the power plant operation of the cooling fan with small angles of rotation of the blades and the low efficiency of the fan and electric drive. Offer automatic temperature controller with electric fan AC does not have the disadvantages of the known automatic regulators: it is not applied to a frequency Converter or inverter phase voltage, as well as the mechanism of rotation of the blades of the cooling fan. It utilizes two identical asynchronous motor with slip-ring rotors, each with a capacity equal to half the power of the fan. The stator odnom the mechanism of rotation of the blades of the cooling fan. Offer automatic temperature controller with smoothly controlled electric cooling fan AC contains the following main elements (Fig.1. The principal block diagram of an automatic temperature controller power unit of the vehicle with continuously controlled electric cooling fan AC): the governing body 1, is connected to the rotation mechanism of the stator 2 asynchronous motor 3, which shaft is connected with the shaft of the second induction motor 4 and the shaft of the cooling fan 5, the stator windings of induction motors connected to the power source 6 and the rotor winding are connected in series through resistors 7. Automatic temperature controller operates as follows. When the value of the variable temperature tpless than the minimum value of tpminthe output signal of the governing body 1 Iyhas a minimum value of Iyminwhen the output signal of the rotation mechanism of the stator 2withhas a minimum value ofminand the stator of the asynchronous motor 3 is in a position (i.e., has an angle turning parts, all specifications cooling 5 equal to zero. This is because when acquiescent position of the stator of induction motors 3 and 4, whenwith=0 electrical degrees, EMF (E) in the rotor windings are directed oppositely and E'p=E'2+E''2=0. Thus the current in the rotor circuit is zero and the electric cooling fan torque (M) is equal to zero andw=0. With increasing tpand further implementation of tp>tpminincreases the output signal of the governing body 1 Iyincreasewithand. While E'p>0; in the windings of the rotors will be the current I2>0, the electric fan M>0,W>0, the increased flow of cooling fan GW. The process of increasing signals tp, Iy,c,E'p, I2andWwill continue until, until equilibrium thermal conditions in the cooling system of power plants. With increasing<180° e. both active components I2>0, i.e., both asynchronous motor operate in motor mode, developing different moments. In the limiting case, when=180° e. (this corresponds to ±180°/p geometric, p - number of pole pairs) vectors EMF winding rotors are the same and E'p=E'2+E''2; engine developing the same moments as the two normal engine. At tp=tpmaxthe signals Iy,with,andWmaximum. When R reaches 180°, i.e., the stator of the asynchronous motor 3 will occupy a position in whichwmaxspeedWbecause of the resistor 7 will be less synchronous 6-10%. Electric cooling fan offer automatic temperature controller has mechanical characteristics shown in Fig. 2. According to the torque of the actuator fromWPris characteristic cooling fan (line 1) reflect the steady-state modes of operation of the electric cooling fan. In Fig.3 given the static characteristic of the electric cooling fan - dependenceW(line 1) and the dependence of efficiencydinduction motors 3 and 4 from(line 2). Dependenced(W) the same as the hydrostatic drive and electric drive cooling fan with phase control of an induction motor. If the static characteristics of the governing body 1 and the mechanism of rotation of the stator 2 linear static characteristic of the automatic temperature controller will have the form shown in Fig.4. Thus, the proposed automatic temperature controller automatically changesW(and supply cooling fan) depending on tpwhen you change it within regulation without the use of frequency Converter and the inverter phase voltage, special asynchronous motor or mechanism of rotation of the blades.

Sources of information

1. Bows N.M. Fundamentals of automation and automatise is echinostoma, 1977.

3. Bows N.M. Automatic temperature control engines. - M.: Mashinostroenie, 1995.

4. Bulgakov, A. A. Frequency control of asynchronous motors. - M.: Nauka, 1966.

5. Burial grounds B. C. Oleinikov, A. M. induction motor with double rotor. - M.: Energy, 1983.

6. Vinokurov C. A., Popov D. A. Electrical machinery railway transportation. M.: Transport, 1986.

7. Zakharchuk A. S. Experimental study of the thyristor system modulating control motor asynchronous motor-fan with two-layer rotor. - L.: the Institute, 1976 (Dept. hand., THE IPU CNIITEI, 25.05.76, №343, 76).

8. A. C. 206627 (USSR).

9. A. C. 246165 (USSR).

10. A. C. 4378415 (USSR).

11. Patent Germany 2121209.

Claims

Temperature controller power unit of the vehicle that contains the power source AC, the governing body, induction motor and cooling fan, characterized in that it utilizes two identical asynchronous motor with slip-ring rotor, the stator windings are connected to a power source, the rotor windings are connected in series with resistors and a shaft connected with the shaft of weborama, connected to the control authority.



 

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