JP2011244636A - Rotary electric machine control apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine control apparatus that rapidly raises the temperature of a permanent magnet of a rotor.SOLUTION: A rotary electric machine control system 10 includes: a rotary electric machine 12; a drive circuit 20 connected to the rotary electric machine; a current command value setting unit 22; and a storage unit 28 connected to the current command value setting unit 22. The current command value setting unit 22 is a circuit that has a function to set a d-axis current command value iand a q-axis current command value ito be supplied to the drive circuit 20. In the circuit, the q-axis current command value iis set to 0, and the d-axis current command value iis defined as a pulse signal so as to increase the speed of temporal variation of a magnetic field applied to a permanent magnet 16. A relevant file 30 showing relationship between a magnet-related temperature and a pulse height value, the number of pulses and the like of the d-axis current command value iis stored in the storage unit 28.

Description

  The present invention relates to a rotating electrical machine control device, and more particularly, to a rotating electrical machine control device having a rotor including a permanent magnet.

  In a rotating electric machine having a rotor including a permanent magnet, the temperature characteristics of the permanent magnet may be a problem.

  For example, in Patent Document 1, as a vehicle-mounted battery state diagnosis device, an electric motor of an electric power steering device is gradually energized, and a deterioration state of the battery is diagnosed based on the energization amount and the battery detection voltage. It is stated. Here, only the d-axis current Id of the electric motor is allowed to flow so that the electric motor does not rotate so that safety is ensured, and the maximum value of Id is set according to the detected motor temperature so that the permanent magnet of the rotor is not demagnetized. It is stated that it is set.

  Patent Document 2 discloses an armature rotating magnetic field and a rotor speed using a rotor magnetic pole position estimation signal and a rotor estimated speed as a method of controlling an IPM motor having a structure in which a permanent magnet is embedded in the rotor. When controlling the temperature, the temperature coefficient in the BH characteristics of the neodymium permanent magnet is -0.09 to -0.13 (% / ° C), and the temperature coefficient of the resistance value of the winding is +0.39 (% / ° C). It is pointed out that there is an influence, and it is stated that the rotor magnetic pole position and the rotor speed are estimated by repeatedly calculating the magnetic saturation of the IPM motor and the temperature rise model of the rotor and the armature winding.

  Further, in Patent Document 3, as a control device for preventing irreversible demagnetization and burnout of a permanent magnet type synchronous machine, an armature linkage magnetic flux φm due to a magnetic flux can be obtained using a q-axis voltage equation. Since the interlinkage magnetic flux φm is related to the magnet temperature, it is stated that the magnet temperature can be estimated from this φm. And it is described that the output of a synchronizer is adjusted according to the estimated magnet temperature.

  Further, in Patent Document 4, as a method for controlling an electric vehicle driving electric motor, there is a proportional relationship between the induced voltage and the amount of magnetic flux of the permanent magnet, and the magnetic flux density of the permanent magnet is from 0.8 T in the range of −25 ° C. to + 150 ° C. It is pointed out that it decreases to 0.58 T, and it is stated that the amount of magnetic flux at the current temperature of the permanent magnet is estimated and the torque correction amount is calculated from the rate of change from the amount of magnetic flux at the reference temperature.

  Patent Document 5 states that the permanent magnet used in the motor generator has a low magnetic flux density and high temperature and is low at high temperature. Therefore, in order to reduce the counter electromotive force of the motor generator, the permanent magnet is heated at a low temperature. ing. Here, as a method for raising the temperature of the permanent magnet provided in the rotor of the motor generator mounted on the vehicle, when the temperature of the permanent magnet is lower than the threshold temperature, the strength of the permanent magnet is increased along the d-axis direction of the rotor over time. The application of a sinusoidal current magnetic field that varies with time.

JP 2007-131076 A JP 2004-135458 A JP 2003-235286 A JP 7-212915 A JP 2008-43094 A

  As described in Patent Document 2, a neodymium magnet used as a strong permanent magnet has a low magnetic flux density at high temperatures. As a result, the characteristics of a rotating electrical machine having a rotor including a permanent magnet are deteriorated. Therefore, as described in Patent Document 5, a sine wave whose strength changes with time along the d-axis direction of the rotor. In this way, an eddy current is generated in the permanent magnet to raise the temperature.

  The sinusoidal current magnetic field in Patent Document 5 can be realized, for example, by setting the d-axis current value to be a sinusoidal function at a control time interval used for operation control of the rotating electrical machine. Since this method uses the control time interval and sine wave output function normally used for operation control of the rotating electrical machine as they are, control is relatively easy. On the other hand, since the value of the d-axis current for temperature rise is a sine wave function, the control cycle of the temperature rise control is determined by one cycle of this sine wave function, and there is a limit to rapid temperature rise. .

  An object of the present invention is to provide a rotating electrical machine control device that can quickly raise the temperature of a permanent magnet.

  A rotating electrical machine control device according to the present invention is a control device for a rotating electrical machine including a rotor having a permanent magnet and a stator having a coil that forms a rotating magnetic field, and relates to a magnet related to the permanent magnet temperature of the rotating electrical machine. A temperature acquisition unit for acquiring the temperature, and when the acquired magnet-related temperature exceeds a preset threshold temperature range, the q-axis current command value is set to zero, and a predetermined control is performed as the d-axis current command value. And a current command value setting unit for setting a pulse peak value corresponding to the magnet-related temperature and a pulse current command value of the number of pulses.

  In the rotating electrical machine control device according to the present invention, it is preferable that the current command value setting unit sets a control time interval used in the rotating electrical machine operation control as a control cycle of the pulse current command.

  In the rotating electrical machine control device according to the present invention, a storage unit that stores the pulse peak value and the pulse number in association with the magnet-related temperature, and a warm-up time acquisition unit that acquires a warm-up time command value of the rotating electrical machine The current command value setting unit preferably searches the storage unit and sets the pulse peak value and the pulse number based on the acquired magnet-related temperature and the acquired warm-up time command value.

  In the rotating electrical machine control device according to the present invention, the storage unit stores a current accumulated value that is a product of the pulse peak value and the pulse number in association with the magnet-related temperature, and the current command value setting unit includes the magnet It is preferable to set the pulse peak value based on the accumulated current value corresponding to the related temperature and the number of pulses corresponding to the warm-up time command value.

  With the above configuration, the rotating electrical machine control device acquires a magnet-related temperature related to the permanent magnet temperature of the rotating electrical machine, and sets the q-axis current command value to zero when the magnet-related temperature exceeds a preset threshold temperature range. As a d-axis current command value, a predetermined control cycle is set as a pulse cycle, and a pulse peak value and a pulse current command value corresponding to the number of pulses are set according to the magnet-related temperature. In the prior art, one cycle of the sine wave function is a control period for increasing the temperature of the permanent magnet, but here, a pulsed d-axis current having a pulse peak value at a predetermined pulse period is used to increase the temperature of the permanent magnet. Therefore, by shortening the pulse period, it becomes possible to quickly increase the temperature of the permanent magnet.

  In the rotating electrical machine control apparatus, a control time interval used in the rotating electrical machine operation control is set as a control period of the pulse current command. In the prior art, one cycle of the sine wave function is formed at a plurality of control time intervals. Here, since the cycle of the pulsed d-axis current is the control time interval, the temperature of the permanent magnet can be quickly increased. It becomes possible.

  In the rotating electrical machine control device, the pulse peak value and the pulse number are stored in association with the magnet-related temperature. Then, the warm-up time command value of the rotating electrical machine is acquired, the storage unit is searched, and the pulse peak value and the number of pulses are set based on the magnet-related temperature and the warm-up time command value. By doing in this way, appropriate temperature increase control can be performed according to the case where it is desired to warm up in a short time to increase the temperature of the permanent magnet and the case where there is a time allowance.

  In the rotating electrical machine control device, the storage unit stores a current accumulated value, which is a product of the pulse peak value and the number of pulses, in association with the magnet-related temperature. The temperature increase of the permanent magnet can be performed in a shorter time as the magnitude of the eddy current is larger and the time during which the eddy current flows is longer. Since the eddy current is determined by the d-axis current, the temperature increase of the permanent magnet can be performed in a shorter time as the accumulated current value of the d-axis current is larger. According to the above configuration, for example, the temperature of the permanent magnet can be quickly increased by performing control to increase the current accumulated value of the d-axis current as the magnet-related temperature is lower.

It is a figure explaining the structure of the rotary electric machine control apparatus of embodiment which concerns on this invention. It is a figure explaining the mode of the pulse-like current command value of the embodiment concerning the present invention compared with the prior art. In embodiment which concerns on this invention, it is a figure explaining the relationship between warm-up time and a pulse peak value. In embodiment which concerns on this invention, it is a figure explaining the relationship between magnet related temperature and an electric current accumulated value.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In the following, a rotating electrical machine mounted on a vehicle will be described as a rotating electrical machine, but this is an illustrative example, and a rotating electrical machine other than a rotating electrical machine mounted on a vehicle may be used. Any rotary electric machine having a rotor including a magnet may be used. For example, a stationary rotary electric machine may be used. Moreover, although the rotating electrical machine included in the rotating electrical machine control system is described as one unit, this is an example for explanation, and a plurality of rotating electrical machines may be included.

  In the following, the permanent magnet will be described as a neodymium magnet having high temperature demagnetization characteristics, and the back electromotive force will be reduced by the temperature rise of the permanent magnet. This is for explaining the effect of the temperature rise of the permanent magnet. It is an illustration and may be other than a neodymium magnet. For example, a magnet having a low-temperature demagnetization characteristic may be used in the case where it is desired to improve the magnetic flux density by increasing the temperature. As such a magnet, a ferrite magnet is known.

  Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted. In the description in the text, the symbols described before are used as necessary.

  FIG. 1 is a diagram illustrating the configuration of the rotating electrical machine control system 10. The rotating electrical machine control system 10 performs control including the operation of the rotating electrical machine 12 mounted on the hybrid vehicle. The rotating electrical machine control system 10 includes a rotating electrical machine 12, a drive circuit 20 connected to the rotating electrical machine 12, a current command value setting unit 22, and a storage unit 28 connected to the current command value setting unit 22. .

The rotating electrical machine 12 is a motor / generator (M / G) mounted on a vehicle, and includes three stators including a stator including a coil 14 that generates a rotating magnetic field and a rotor including a permanent magnet 16. This is a rotating electrical machine. In FIG. 1, one coil 14 and one permanent magnet 16 are extracted and shown, and a state where a current source indicated as i _d ^* (p) is connected to the coil 14 is shown. The manner in which the temperature of the magnet 16 is controlled to rise is schematically shown, and the detailed contents thereof will be described later. The actual rotating electrical machine 12 is configured by, for example, a three-phase distributed winding coil wound around a stator and about a dozen permanent magnets 16 embedded in the rotor. The permanent magnet 16 is a neodymium magnet and has characteristics that the magnetic flux density is large and the back electromotive voltage is large at low temperatures.

  The drive circuit 20 receives a current command value corresponding to the required output of the vehicle from the current command value setting unit 22, generates a three-phase drive signal corresponding to the current command value, and supplies it to the three-phase synchronous rotating electrical machine 12. This circuit has a function to

  The three-phase synchronous rotating electrical machine 12 has a sine wave operation mode and a rectangular wave operation mode as operation modes, and the drive circuit 20 generates a three-phase drive signal corresponding to these operation modes.

In the sine wave operation mode, the three-phase drive current that actually flows through the rotating electrical machine 12 is converted into a d-axis current value _id and a q-axis current value _iq , and the d-axis current output from the current command value setting unit 22 Current feedback control for comparing the command value i _d ^* with the q-axis current command value i _q ^* is performed. Then, the control deviation is calculated by PI control so as to make the current deviation zero, and the sine wave output signal calculated thereby is compared with a triangular wave carrier wave, and a three-phase drive signal by pulse width modulation (PWM) is generated. . The sine wave current magnetic field in the above-mentioned patent document 5 is a magnetic field generated by the stator coil 14 by this sine wave output signal.

In the rectangular wave operation mode, the three-phase drive current that actually flows through the rotating electrical machine 12 is converted into a d-axis current value _id and a q-axis current value _iq , and an estimated torque is obtained from this to obtain a torque command value. Torque feedback for comparison is performed. Then, based on the relationship between the voltage phase and the torque value obtained in advance so as to make the torque deviation zero, the control deviation is obtained by PI control, and the voltage phase corresponding to the control deviation is calculated. Based on the calculated voltage phase, a rectangular wave three-phase drive signal having a voltage phase is generated.

The current command value setting unit 22 is a circuit having a function of setting a d-axis current command value i _d ^* and a q-axis current command value i _q ^* to be supplied to the drive circuit 20. For example, the torque command value is calculated as a set of the d-axis current command value I _d ^* and the q-axis current command value I _q ^* using a table or the like created in advance, and the calculated value is set as the current command value. Here, in particular, when it is desired to increase the temperature of the permanent magnet 16 of the rotating electrical machine 12, it has a function of generating and setting a current command value suitable for rapid temperature increase. Specifically, under a condition that the rotating electrical machine 12 is not rotated, a magnetic field that changes with time is applied to the permanent magnet 16, and an eddy current is generated in the permanent magnet so as to cancel the magnetic field. Control to increase the temperature.

Such control is also performed in the prior art by setting the q-axis current command value i _q ^* to zero and the d-axis current command value i _d ^* as a sine wave function. The value i _q ^* is set to zero, the d-axis current command value i _d ^* is used as a pulse signal, and the time-dependent change of the magnetic field is accelerated to quickly increase the temperature of the permanent magnet 16. There are features.

  The current command value setting unit 22 has a function of acquiring the magnet-related temperature 24 and the warm-up time 26. The magnet-related temperature 24 is a temperature related to the temperature of the permanent magnet 16 and may be data obtained by directly detecting the temperature of the permanent magnet 16. The temperature of the rotor of the rotating electrical machine 12 and the temperature of the stator coil 14 may be indirectly measured. Data such as temperature, the magnitude of a drive signal supplied to the rotating electrical machine 12, the temperature of the motor case or cooling medium of the rotating electrical machine 12, the environmental temperature of the vehicle, and the like may be used. The magnet-related temperature 24 is acquired by the current command value setting unit 22 by transmitting these data through an appropriate signal line. The warm-up time is a temperature rise time that is a time for performing temperature rise control of the permanent magnet 16 by the function of the current command value setting unit 22 when the magnet-related temperature 24 is low. The warm-up time is acquired by the current command value setting unit 22 by transmitting data such as user input via an appropriate signal line.

The storage unit 28 is a memory that is connected to the current command value setting unit 22 and the drive circuit 20 and has a function of storing programs and the like used in these. Here, it has a function of storing a relation file 30 indicating the relationship between the magnet-related temperature, the pulse peak value of the d-axis current command value i _d ^* , the number of pulses, and the like. The current command value setting unit 22 reads out and uses the relationship file 30, so that the pulse peak value and the number of pulses of the d-axis current command value i _d ^* corresponding to the acquired magnet-related temperature 24 and warm-up time 26 are obtained. Can be set easily.

  The operation of the above configuration, in particular, the contents of the relation file 30 in the storage unit 28 and the function of the current command value setting unit 22 will be described in detail with reference to FIGS. FIG. 2 is a diagram comparing a current command value based on a sine wave function of the prior art and a pulsed current command value. FIG. 3 is a diagram for explaining the relationship between the warm-up time and the pulse peak value. FIG. 4 is a diagram for explaining an example of the relation file 30.

In FIG. 3, the upper diagram shows the state of the d-axis current command value i _d ^* (f) based on the sine wave function of the prior art, and the lower diagram shows the pulsed d-axis current command value i. in view showing a state of _d ^* (p), both the horizontal axis indicates time and the vertical axis is ^* d-axis current command value i _d.

The d-axis current command value i _d ^* (f) by the sine wave function gives the d-axis current command value i _d ^* by the sine wave function. As described above, the same control as the sine wave operation mode of the rotating electrical machine 12 is performed. Is used. As described above, in the sine wave operation mode, the actual current value is fed back and compared with the current command value. In this way, the actual current value is detected and fed back to find the deviation from the current command value, and the signal processing time sufficient to correct the drive signal so that the deviation is zero, the control time interval As Δt, the d current command value i _d ^* is output for each Δt.

  The control time interval Δt is determined by the calculation speed of the CPU that is the central processing unit for controlling the current command value setting unit 22 and the drive circuit 20, and if a high-speed CPU is used, Δt can be shortened, but the cost is high. It will be something. If a CPU in a range suitable for mounting on a vehicle is used, there is a limit to shortening Δt. For example, Δt is a control time interval of several ms.

In this way, since the current is output discretely for each d current command value i _d ^* Δt, in order to make the sine wave function formed by this discrete output smooth, one cycle of the sine wave function is controlled. It is preferable to have a sufficient length for the time interval Δt. In order to explain this state, four sine wave functions 40, 42, 44, and 46 having different one-cycle lengths are shown on the upper side of FIG. The sine wave function 40 has a half cycle length of 12Δt. The sine wave function 42 has a half cycle length of 6Δt. The sine wave function 44 has a half cycle length of 2Δt. The sine wave function 46 has a half cycle length of Δt.

In the case of the sine wave function 40, it is assumed that the d current command value i _d ^* (f) is output every Δt, and the output is 13 times in a half cycle, so that a clean sine wave is formed as a whole. I understand. In the case of the sine wave function 42, since the d current command value i _d ^* (f) is output seven times in a half cycle, as compared with the sine wave function 40, the formation of the sine wave is slightly insufficient as a whole. It is. Here, the output of the d current command value i _d ^* (f) when the control time interval is (Δt / 2) is shown by a broken line, but in this case, the output is 13 times in a half cycle. Therefore, it can be seen that, as with the sine wave function 40, a clean sine wave is formed as a whole.

Since the sine wave function 44 is an output of the d current command value i _d ^* (f) three times in a half cycle, it is actually a triangular wave function. Even if the control time interval is set to (Δt / 2), since the output of the d current command value i _d ^* (f) is performed five times in a half cycle, the formation of the sine wave is insufficient as a whole. Sinusoidal function 46, since the output of the two half period d current command value i _d ^* (f), in practice d current command value i _d ^* (f) has a zero value. Even if the control time interval is (Δt / 2), since it is an output of the d current command value i _d ^* (f) three times in a half cycle, it is actually a triangular wave function.

As described above, when the d-axis current command value i _d ^* (f) is given by the sine wave function, there is a limit to shortening one cycle. In the example of FIG. It needs to be around 10 times Δt. As described above, when the control time interval of Δt is several ms, one cycle of the sine wave function is several tens of ms. Therefore, the d-axis current command value i _d ^* (f) is given to the sine wave function, a magnetic field that changes with time is formed by the stator coil 14, and an eddy current is generated in the permanent magnet 16. In order to raise the temperature, the control is performed in units of several tens of ms.

The state of the pulsed d-axis current command value i _d ^* (p) is shown on the lower side of FIG. As can be seen from comparison with the sine wave function on the upper stage side, the pulsed d-axis current command value i _d ^* (p) has the control time interval Δt as the pulse interval. As described above, since the control time interval Δt is determined by the calculation speed of the CPU used for the control of the rotating electrical machine control system 10, the pulsed d-axis current command value i _d ^* (p) Is output at a control cycle that uses the maximum calculation speed. In FIG. 2, the pulse duty of the pulsed d-axis current command value i _d ^* (p) is shown as 50%. However, depending on the calculation speed of the CPU, the pulse duty is set to a value other than 50%. It may be a thing.

FIG. 3 illustrates the relationship between the pulse peak value of the pulsed d-axis current command value i _d ^* (p) used for temperature increase control of the permanent magnet 16 and the warm-up time for the number of pulses to be output. It is a figure to do. Here, the relationship between each pulse peak value and the number of pulses for warm-up is shown for four types of warm-up times. Since the control period, which is the pulse period of the pulsed d-axis current command value i _d ^* (p), is Δt, the number of pulses for warm-up is given by the number of pulses = (warm-up time / Δt). It is done.

As shown in FIG. 3, assuming that the pulse peak _value when the warm-up time is 8T ₀ is A ₀ , the pulse peak _value when the warm-up time is 4T ₀ is 2A ₀ . The pulse peak value when the warm-up time is 2T ₀ is 4A ₀ , and the pulse peak value when the warm-up time is T ₀ is 8A ₀ . That is, when the permanent magnet 16 is warmed up, (warm-up time × pulse peak value) = 8 A ₀ T _{0, which} is a constant value. As described above, since the warm-up time is Δt times the number of pulses for warm-up, in order to warm up the permanent magnet 16 under a certain condition, (number of pulses for warm-up × pulse peak value) What is necessary is just to set the pulse number for warming up, and a pulse peak value under fixed conditions.

  The product of the number of pulses for warming up and the number of pulses is a cumulative value of current that flows through the coil 14 for warming up. This accumulated current value is related to the accumulated value of the periodic magnetic field applied to the permanent magnet 16, and is related to the accumulated value of the eddy current generated in the permanent magnet 16. Therefore, (number of pulses for warming up × pulse peak value) is a value related to the heat generated by the eddy current in the permanent magnet 16, and therefore indicates the degree of warming up of the permanent magnet 16. become. Therefore, in order to warm up the permanent magnet 16 under a certain condition, the number of pulses for warming up and the pulse peak value are set under a certain condition of (number of pulses for warming up × pulse peak value). It will be sufficient to set.

  FIG. 4 is a diagram for explaining an example of the relation file 30 stored in the storage unit 28. The horizontal axis of the relation file 30 in FIG. 4 is the magnet-related temperature 24, and the vertical axis is (warm-up time × pulse peak value) described in FIG. 3, corresponding to (number of pulses for warm-up × pulse peak value). The value to be Since (warm-up time × pulse peak value) is a value related to the current accumulated value given to the coil 14 for warm-up as described above, this will be simply referred to as a current accumulated value hereinafter. .

  In FIG. 4, the current accumulated value when the control cycle is Δt is indicated by a solid line, and for reference, the control cycle is (Δt /) assuming that the CPU can operate even at the control time interval (Δt / 2). The current accumulated value in the case of 2) is indicated by a broken line. As shown here, the current accumulated value when the control cycle is (Δt / 2) is set as a double of the current accumulated value when the control cycle is Δt.

As shown in FIG. 4, when the magnet-related temperature 24 becomes less than the temperature θ ₄ , a current accumulation value is set for warming up. That is, the current command value setting unit 22 outputs a pulsed d-axis current command value i _d ^* (p) when the acquired magnet-related temperature 24 becomes low temperature exceeding θ ₄ that is a predetermined threshold temperature range. To do. At that time, as described above, the q-axis current command value i _q ^* = 0 is set so as not to rotate the rotating electrical machine 12.

The number of pulses and the pulse peak value for warming up the pulsed d-axis current command value i _d ^* (p) are set under the condition that the current accumulated value is constant as described above. The accumulated current value is set as a larger value as the magnet-related temperature 24 is lower.

The current accumulated value can be set so as to continuously change with respect to the magnet-related temperature 24. However, as shown in the example of FIG. It is good also as what changes. In the example of FIG. 4, the accumulated current value when the magnet-related temperature 24 is between θ ₀ and θ ₁ is the largest, between θ ₁ and θ ₂ , between θ ₂ and θ ₃ , and between θ ₃ and θ ₄ . As the temperature increases, the current accumulated value is set as a smaller value sequentially. As described above, when θ ₄ or more, the accumulated current value = 0, that is, the pulsed d-axis current command value i _d ^* (p) is not output.

  The relationship file 30 shown in FIG. 4 shows the relationship between the magnet-related temperature 24 and the current accumulated value in a map format. In addition to the map format, the storage unit 28 stores a lookup table format and a calculation formula. In a form, these relationships can be stored. In the example of FIG. 4, the relationship between the magnet-related temperature 24 and the accumulated current value is stored, but other than this, the magnet-related temperature 24, the number of pulses for warm-up, and the pulse peak value are also related. Any relationship format may be used as long as it stores the relationship. For example, the magnet-related temperature 24 may be stored as a parameter for the relationship between the number of pulses for warm-up and the pulse peak value, and the relationship with the warm-up time 26 instead of the number of pulses for warm-up. May be stored.

By using this relationship file 30, the current command value setting unit 22 can read the accumulated current value corresponding to the acquired magnet-related temperature 24. Then, the acquired warm-up time is divided by the control period Δt to calculate the number of pulses necessary for warm-up, and the pulse peak value is obtained by dividing the current accumulated value read earlier by this number of pulses. be able to. Then, the pulse peak value obtained in this way is output to the drive circuit 20 as a pulsed d-axis current command value i _d ^* (p) at the pulse interval of the control period Δt for the obtained number of pulses. To do. As a result, the permanent magnet 16 is quickly warmed up, and the temperature rises. For example, the counter electromotive force when the rotating electrical machine 12 operates can be reduced.

  The rotating electrical machine control device according to the present invention can be used for controlling a rotating electrical machine having a rotor including a permanent magnet.

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machinery control system, 12 Rotating electrical machinery, 14 Coils, 16 Permanent magnet, 20 Drive circuit, 22 Current command value setting part, 24 Magnet related temperature, 26 Warm-up time, 28 Storage part, 30 Related files, 40, 42, 44, 46 Sine wave function.

Claims (4)

A control device for a rotating electrical machine including a rotor having a permanent magnet and a stator having a coil for forming a rotating magnetic field,
A temperature acquisition unit for acquiring a magnet-related temperature related to the permanent magnet temperature of the rotating electrical machine;
When the acquired magnet-related temperature exceeds a preset threshold temperature range, the q-axis current command value is set to zero, the d-axis current command value is set to a predetermined control cycle as a pulse cycle, and the magnet-related temperature A current command value setting unit for setting a pulse peak value and a pulse current command value corresponding to the number of pulses,
A rotating electrical machine control device comprising: In the rotating electrical machine control device according to claim 1,
The current command value setting unit sets a control time interval used in rotating electrical machine operation control as a control cycle of a pulse current command. In the rotating electrical machine control device according to claim 1,
A storage unit that stores the pulse peak value and the pulse number in association with the magnet-related temperature;
A warm-up time acquisition unit for acquiring a warm-up time command value of the rotating electrical machine;
With
The current command value setting section
A rotating electrical machine control device characterized by searching a storage unit and setting a pulse peak value and a pulse number based on an acquired magnet-related temperature and an acquired warm-up time command value. In the rotating electrical machine control device according to claim 3,
The storage unit stores a current accumulated value that is a product of the pulse peak value and the number of pulses in association with the magnet-related temperature,
The current command value setting unit sets a pulse peak value based on a current accumulated value corresponding to a magnet-related temperature and a pulse number corresponding to a warm-up time command value.

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