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Figure 1 shows schematically the general structure of the stator and rotor of an SRM motor, for which. These fi-. In conventional control circuits of three-phase SRM motors, if the phase excitation signal is applied to the coils 4, 5, 6, with a predetermined phase difference, the SRM motor is. The operation of a conventional SRM motor control circuit will be described below, with main reference to the resistive discharge circuit shown in FIG.

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Figure 1 shows schematically the general structure of the stator and rotor of an SRM motor, for which. These fi-. In conventional control circuits of three-phase SRM motors, if the phase excitation signal is applied to the coils 4, 5, 6, with a predetermined phase difference, the SRM motor is. The operation of a conventional SRM motor control circuit will be described below, with main reference to the resistive discharge circuit shown in FIG.

The conventional resistive discharge circuit comprises coils 4, 5, 6, connected in parallel, switching parts T1, T2, T3 for switching the excitation current passing through the coils 4, 5, 6 by controlling the excitation signal. Sa is applied to the transistor of the switching part T1, which makes the transistor on, and a current flows through.

Then, if the switching part T2 is blocked by ceasing to supply the second phase excitation signal Sb and if the switching part T3 is turned on by applying a third phase excitation signal Sc to the switching part T3, the excitation current stored in the coil 5 in the form of magnetic energy flows, via the diode D2 and the resistor R2, towards the capacitor C1 to be stored there in the form of energy and a current crosses the winding 6 , to generate a magnetic flux.

As this is. In the discharge circuit of. In the non-symmetrical bridge circuit shown in FIG. It turns out, however, that the energy loss is too great in the resistance discharge circuit, that the space taken up by the switching part T4 is large, that the switching speed is limited due to mutual inductance. In addition, the manufacturing costs of the asymmetric bridge circuit are very high, and the volume of the two-wire winding motor is too large, and its manufacture is difficult.

Generally, in the case where there is no phase difference in an SRM motor, in other words when the poles 1, 2 and 3 of the stator coincide with the projecting parts of the rotor 7, the windings inductors.

In an SRM motor, excitation is generally triggered when the phase difference is 45, that is to say. If the excitation is triggered when the inductance of the bo hoes decreases, the motor is braked. If a pulse width modulation signal is applied which will be referred to hereinafter as a PWM signal, for the initials of the English term "Pulse Width Modulation" of. The current stored in the form of magnetic energy in the coil 4 then begins to flow via the path of.

Then, when the reverse phase braking is performed, an amount of current greater than the amount of current applied is returned from the winding 4 via the first. In FIGS. If a low level phase excitation signal is applied to the gate electrode of the N-MOS transistor M2, while the current increases, this transistor M2 is blocked. Thus, the current flowing in the winding 4 is modified as shown in FIG. However, when the N-MOS transistor M2 is in the off state, because the current stored in the form of magnetic energy in the coil 4 flows, the current does not decrease rapidly in the closed loop comprising the coil 4 and the diode D9.

Thus, because a relatively large current intensity continues to flow in the loop, even when the inductance decreases, the SRM motor is braked and is requested by a torque such as that shown in the. This means that the circuit of FIG. Another object of the present invention consists in proposing an SRM motor control circuit which is able to prevent an overvoltage being applied to the capacitor which is connected between the positive terminal and the negative terminal of the electric power source, when the engine is.

Yet another object of the present invention is to provide an SRM motor control circuit which is at. Yet another object of the present invention is to provide an SRM motor control circuit in which. To this end, according to the invention, the control circuit for a phase switching motor, in particular a reluctance motor comprises: - first switching means for carrying out the. According to another embodiment of the invention, the first switching means comprise a plurality of elements. According to another embodiment of the invention, the means for generating magnetic flux comprise a plurality of windings.

The series of diodes may include a plurality of diodes. The number of switching elements is preferably three or four. The first energy storage means include a capacitor. The second switching means include a switching element. This switching element can be a transistor or a MOS transistor. According to yet another embodiment of the invention, part of the energy of the capacitor of the first.

The second energy storage means can include a capacitor. According to yet another embodiment, the control circuit for a phase-switching motor can comprise. The frequency modulation means receive a control signal and a braking signal to perform summation.

The frequency of the control signal is progressively reduced at the braking point during phase inversion braking. The rate of presence of the control signal is increased at the braking point during braking by. According to yet another embodiment of the control circuit for a phase-switching motor, said last control means comprising: - signal downward phase detection means intended to receive the corresponding pairs of. The decreasing phase detection means emits a signal having a predetermined width on the falling edge of the corresponding pairs of the electrical signals.

The predetermined width is significantly greater than. Said level shifting means consist of a photocoupler or else a pulse transformer or else a level switch. The shape of the current flowing to the magnetic flux generation means is suscep-. Means for preventing the flow of current in the direction. The third switching means may include a switching element which may consist of a transistor or an MOS transistor.

Other objects, characteristics and advantages will appear on reading the description of various modes of reaction. Reading of the invention, made without limitation and with reference to the appended drawing, in which: it - FIG.

The magnetic flux generation part 13, which comprises a plurality of coils connected in parallel, induces the magnetic flux which rotates the rotor of the SRM motor. The magnetic flux generation part 13 of the three-phase SRM motor comprises 3 coils 9, 10, 11 and that of a four-phase SRM motor has 4 coils.

The first switching part 14 includes transistors Q1, Q2, Q3 intended to switch the phase excitation current, which passes through the windings 9, 10, 11, by controlling the phase excitation signal and the series of diodes 15 comprises diodes D16, D17, D18, the end terminals of which are respectively connected to the windings 9, 10, The first part of energy storage further comprises a capacitor C2, and the conversion part energy 17 comprises an inductive coupling circuit 17a and a diode 17b.

The second switching part 18 includes a transistor Q4. Referring to FIG. As a result of this alternating switching, part of the energy which is stored in the capacitor C2 of the first energy storage part 16 is transferred to the. Then, if the transistor Q2 is blocked due to the stopping of the supply of the second phase excitation signal Sb to the transistor Q2, the transistor Q3 is turned on by applying a third phase excitation signal Sc to the base of transistor Q3, the excitation current which was stored in the winding 10 in the form of magnetic energy is stored in the capacitor C2 in the form of energy.

In the same way that the energy which is stored in the capacitor C2 in the form of electrical energy, after the cessation of the supply of the second phase excitation signal Sb, is brought back to the capacitor C1, the current of excci -. In this case, the voltage across the capacitor C2 charged, is a function of the current 10 flowing through the windings 9, 10, 11 and the speed of rotation of the SRM motor.

By comparison. With reference to FIG. The first energy storage part 16 further comprises a capacitor C2 and the energy conversion part 17 comprises an inductive coupling circuit 17a and a diode.

As shown in FIG. If the control signal is high, the signal from the output of OR gate 21 is also high, this. Nb stroke of the inductively coupled circuit 17a. If the control signal is at the low level, the output signal from the OR gate 21 is also at the low level, which has the effect of blocking the N-MOS transistor.

When the N-MOS transistor is off, the magnetic energy induced from the first winding Np to the second winding Ns is stored in capacitor C. In this case, if the control signal at the input of the OR gate 21 is switched from the low level to the high level, the signal at the output of the OR gate 21 also goes to the high level without relation to the control signal at the other input of the OR gate Thus, the N-MOS transistor. The energy, which was stored in the capacitor C2, is discharged in a closed loop which comprises the first winding Np of the inductive coupling circuit 17a, the transistor N-MOS, and the corresponding pairs of windings 9, 10, 11, 12 , and this discharged energy is stored in the corresponding pairs of the coils 9, 10, 11, 12, in the form.

It follows that relatively large currents flow through the corresponding pairs of windings 9,, 11, 12, even when the inductance decreases and the motor is thus braked. In other words, if a high level braking signal is applied to the braking point,.

The frequency modulation part in FIG. When the braking signal is at low level and the control signal is at high level, the current il flowing through the first winding Np of the inductive coupling circuit 17a increases continuously. Then, if the control signal is switched to low, the current flowing through the second winding decreases because the magnetic energy of the first winding Np is induced towards the second.

In this case, if a high level braking signal is applied, the current flowing through the first winding Np is kept constant at a constant level after increasing continuously, and no current flows through the second winding, because there is no.

In the case where a braking signal is applied from the high level to the braking point, in order to brake the SRM motor, the intensity of the current flowing through the first winding Np of the inductive coupling circuit 17a can be relatively important. Therefore, to deal with this problem, different methods can be used which can be considered as other embodiments of the present invention. You can decrease the frequency of the control signal at the braking point gradually, you can increase the signal presence rate, or you can control the N-MOS transistor M13, using the current of the.

This part comprises: a part 28 for detecting phase or flank or slope descending intended to receive the corresponding phase excitation signal for detect the falling edge of the slope of this phase hereinafter referred to as the falling phase.

If the third and fourth phase excitation signals are respectively applied to the detection part 28 in the same way, this latter part emits in the order the signals represented in FIGS. The signals shown in FIGS. Consequently, the OR gate 29 which receives the output signal from the detection part 28, emits an output signal shown in FIG.

The output signal from the OR gate 29 is picked up by the level shift part 30 to be addressed to input of. AND gate The level shift part 30 can be constituted by a photocoupler, a pulse transformer. The AND gate 32 receives the output signal from the level shift portion 30 and the output signal from the PWM signal generation portion 31 in order to make the logic product thereof, and to emit a signal as shown in fi gure 11J.

The output of gate ET 32 is addressed to the input. In this case, the Hg output signal from. When the first phase excitation signal is at the high level, the excitation current which has been stored in the form of magnetic energy in the winding 9, is stored in the form of electrical energy in the capacitor C2 of the second part.

In this state, if the switching signal applied to the N-MOS transistor M14 is switched from high to low. When the N-MOS transistor M14 is turned on, the current flowing through the winding 9 flows in a closed loop through the diode D16, so that the current in the winding 9 decreases very slowly.

Meanwhile, while the N-MOS transistor M14 is blocked, the current flowing through the winding 9 decreases rapidly because it. If the presence rate of the PWM signal is high, the duration for which the N-MOS transistor is on is extended, so that the current decreases slowly, while if the presence rate of the PWM signal is low, the duration for which the N-MOS transistor is blocked is extended, so that the current decreases rapidly. Thus, the higher the presence rate, the more the duration of the current in the winding 9 increases.

This is due to the fact that the current in the winding 9 decreases very slowly. Thus, 3 ; when the second phase excitation signal is switched.

Thus, it is possible to reduce the manufacturing costs and the costs of obtaining the circuit.

HELLMA TRAYCELL PDF

FR2717966A1 - Three-phase switched reluctance motor driving circuit - Google Patents

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