CN101789752A - Control device of electric motor - Google Patents
Control device of electric motor Download PDFInfo
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- CN101789752A CN101789752A CN201010106684A CN201010106684A CN101789752A CN 101789752 A CN101789752 A CN 101789752A CN 201010106684 A CN201010106684 A CN 201010106684A CN 201010106684 A CN201010106684 A CN 201010106684A CN 101789752 A CN101789752 A CN 101789752A
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Abstract
The invention provides a kind of control device of electric motor, can obtain following structure: in control device of electric motor according to the electric current of the temperature limitation inverter circuit of winding etc., motor is stopped, and, make this motor rotation be driven into maximum limit with respect to allowing output.Detect the temperature of at least one side in winding (3) and the inverter circuit (11) by temperature sensing circuit (41).And, current limit circuit (35) is set, make when the said temperature that detects at said temperature testing circuit (41) reaches set point of temperature, make above-mentioned current limit value be reduced to setting according to the output of this temperature sensing circuit (41) greater than zero.
Description
Technical field
The present invention relates to constitute and detect the current value that flows into the shunt resistance that is connected with the low potential side of inverter circuit (inverter circuit) and limit the control device of electric motor of the output of inverter circuit, particularly the technical field controlled of motor driven according to this current value.
Background technology
In the past, adopted the drive source of motor as various devices, and the known control device that possesses inverter circuit for the rotation of controlling this motor drives.Specifically, the motor of general structure possesses: have the stator of approximate circle tubular of polyphase windings and the rotor that has a plurality of magnet and rotatably make with respect to this stator.In the motor of this structure, above-mentioned control device is switched on to the polyphase windings of said stator in proper order by the switch motion of the switch element in the inverter circuit, forms rotating magnetic field in this stator, thereby rotation drives the rotor that possesses above-mentioned magnet.
In addition, for example shown in Figure 4, as control device as described above, the control device of known following formation: drive control part 121 detects the electric current that flows into the shunt resistance 114 that is connected with the low potential side of inverter circuit 111, be limited in the electric currents that flow in the above-mentioned inverter circuit 111 so that this electric current less than current limit value, and detect the temperature of windings 103, inverter circuit 111 by temperature sensing circuit 141, also limit electric current in the above-mentioned inverter circuit 111 according to this testing result.In the control device 101 of this structure, in general, as shown in Figure 5, the detected temperatures of said temperature testing circuit 141 detected winding 103 grades becomes limit temperature when above, makes electric current become zero, drives with the rotation that stops motor 102.In addition, among above-mentioned Fig. 4, symbol 104 expression DC power supply, the controller of symbol 105 expression motor 102, symbol 122 expressions are used for the position of rotation testing circuit of the position of rotation of detection rotor.
On the other hand, other structure as above-mentioned control device, for example disclosed as patent documentation 1, known following structure: according to the temperature of the winding (coil) of motor, the maximum output torque of motor was changed by 2 stages, and in the process of this variation, according to the temperature limitation torque of winding.
[patent documentation 1] TOHKEMY 2008-104299 communique
But, in above-mentioned structure shown in Figure 4, the winding of motor, the temperature of inverter circuit reach threshold value when above, if make the electric current of the winding that flows through this motor become zero and the rotation that stops motor drives, even then rise or temporarily the stopping of the motor that causes of the influence of the environment temperature of high temperature owing to the temporary temperature of winding, in the controller side system mistake that stops to cause owing to motor taking place also, must carry out restarting of whole system.Like this, stop if the rotation of motor drives, then the influence that whole system is caused is big.
To this, as described in above-mentioned patent documentation 1,, this motor is stopped, and its torque is reduced according to winding temperature even the temperature of the winding of motor rises, can reduce the influence all thus to system, construct stable system.But under the situation of above-mentioned patent documentation 1, owing to according to the winding temperature of above-mentioned motor torque is changed, so torque suppressed gradually, and output therebetween is suppressed.
Summary of the invention
The present invention proposes in view of the above problems, its purpose is to obtain following structure: limit in the control device of electric motor of electric current of inverter circuit in the temperature according to winding etc., can motor be stopped, and, this motor rotation is driven into to greatest extent with respect to allowing output.
In order to achieve the above object, in the control device of electric motor involved in the present invention, when the temperature that detects winding temperature, the inverter circuit of motor at temperature sensing circuit reaches set point of temperature, current limit value is reduced to greater than zero setting, thereby can not stop motor, and with respect to allowing output, rotation is driven into to greatest extent.
Specifically, as object, this control device of electric motor has with control device of electric motor in the 1st invention: at the inverter circuit of predetermined timing to the winding energising; And when the electric current that flows into the shunt resistance that is connected with the low potential side of this inverter circuit reached current limit value, restriction flowed into the current limit circuit of the electric current of above-mentioned inverter circuit.
And, temperature sensing circuit with the temperature that detects at least one side in above-mentioned winding and the inverter circuit, when above-mentioned current limit circuit reaches set point of temperature at the said temperature that is detected by the said temperature testing circuit, make above-mentioned current limit value be reduced to setting greater than zero according to the output of this temperature sensing circuit.
By above structure, when the temperature that detects the winding of motor and at least one side in the inverter circuit at temperature sensing circuit reaches set point of temperature, the current limit value that is used in the current value of this inverter circuit of restriction inflow is reduced to greater than zero setting, even thereby the temperature of the winding temperature of motor, inverter circuit rises, also can not stop this motor and continue rotation, therefore, can prevent that motor from stopping system all being impacted.And, when said temperature reaches set point of temperature, because current limit value is reduced to the afore mentioned rules value, current limit value can be set big as far as possible,, can motor be stopped up to reaching this set point of temperature, and, the motor rotation is driven into to greatest extent with respect to allowing output.
In the above-mentioned formation, above-mentioned current limit circuit makes above-mentioned current limit value reduce (the 2nd invention) according to the said temperature that is detected by the said temperature testing circuit steppedly.
Thereby; because can be according to stepped ground of the winding temperature switch current limits value of motor, therefore, even and under the situation that the temperature of winding, inverter circuit does not descend in this current limit value reduction; also can further reduce current limit value, seek the protection of motor more reliably.
In addition, preferably, above-mentioned current limit circuit has: bleeder circuit, have a plurality of resistive elements, and the electric current that flows into above-mentioned shunt resistance can be detected as voltage; Current detection circuit when reaching pre-set threshold by the detected voltage of above-mentioned bleeder circuit, detects the electric current that flows into above-mentioned shunt resistance and reaches above-mentioned current limit value; And switch element, move according to the output of said temperature testing circuit, so that when the said temperature that is detected by the said temperature testing circuit reaches set point of temperature, reduce the resistance value of above-mentioned bleeder circuit, thus reduce above-mentioned current limit value (the 3rd invention).
Like this, can be easily and realize reliably above-mentioned the 1st the invention structure.Promptly, when the temperature of the winding temperature of motor, inverter circuit reaches set point of temperature, the switch element that moves according to the output of temperature sensing circuit forms and constitutes the circuit that the electric current that allows to flow into shunt resistance descends as the resistance value in the bleeder circuit of voltage detecting, (state that switch element is failure to actuate) was big when therefore, the voltage ratio in this bleeder circuit was common.And in current detection circuit, the voltage threshold that the electric current of the above-mentioned shunt resistance of judgement inflow reaches current limit value is certain, therefore if the action of above-mentioned switch element, even it is little then to flow into the electric current of above-mentioned shunt resistance, also can be judged as and reach current limit value, seem, can set this current limit value little.Thereby, by above-mentioned structure, can reduce current limit value for the electric current that flows into shunt resistance, realize the structure of above-mentioned the 1st invention.
In addition, preferably, above-mentioned switch element is made of transistor, its control terminal is connected with the outlet side of said temperature testing circuit, and the resistive element in other resistive element and the above-mentioned bleeder circuit is connected in parallel by switch motion, in the bleeder circuit side of above-mentioned switch element, the mode that is positioned at this switch element side with anode-side is provided with diode (the 4th invention).
Thereby, can be according to the switch motion of the output control transistor of the temperature sensing circuit of the temperature that detects winding, inverter circuit, by this switch motion, the resistive element in other resistive element and the above-mentioned bleeder circuit is connected in parallel, can reduce the resistance in this bleeder circuit.Thereby, by transistor as described above is set, can reduce the resistance in the bleeder circuit according to the output of said temperature testing circuit, the voltage that increase detects from this bleeder circuit, and can correspondingly be reduced in the voltage that the shunt resistance side is allowed, promptly with the corresponding voltage of current limit value of the electric current that flows into this shunt resistance.
In addition, bleeder circuit side at above-mentioned switch element, the mode that is positioned at the switch element side with anode-side is provided with diode, thereby when above-mentioned switch element is failure to actuate, when promptly winding that is detected by temperature sensing circuit and at least one side's in the inverter circuit temperature does not reach set point of temperature, can prevent reliably that electric current is from bleeder circuit side inflow switch element.
Thereby, by said structure, can be easily and realize reliably above-mentioned the 3rd the invention structure.
And, be preferably at least one side in above-mentioned winding and the inverter circuit by resin-sealed, the said temperature testing circuit detect in above-mentioned winding and the inverter circuit at least by the temperature (the 5th invention) of above-mentioned resin-sealed component parts.In the motor of this structure, may be become high temperature by the switch element of resin-sealed winding, inverter circuit, but, can prevent stopping of motor reliably by being suitable for the structure of above-mentioned the 1st to the 4th invention.
As mentioned above, according to control device of electric motor involved in the present invention, when current limit circuit reaches set point of temperature in the winding of motor and at least one side's in the inverter circuit temperature, output according to temperature sensing circuit is reduced to greater than zero setting current limit value, therefore can make motor rotate driving efficiently, and not stop the temperature that motor just can reduce winding, inverter circuit.
In addition, according to the 2nd invention, above-mentioned current limit circuit reduces above-mentioned current limit value according to said temperature steppedly, therefore can carry out the protection of motor more reliably.
In addition, according to the 3rd invention, when said temperature reaches set point of temperature, make the switch element action, make and the electric current that the flows into shunt resistance resistance value as the bleeder circuit of voltage detecting can be reduced, reduce current limit value thus, therefore can realize the structure of above-mentioned the 1st invention simple and reliablely.Specifically, as the 4th invention, above-mentioned switch element is made of transistor, this transistor carries out switch motion so that the resistive element in other resistive element and the above-mentioned bleeder circuit is connected in parallel according to the output of temperature sensing circuit, and be provided for preventing to flow to the diode of above-mentioned transistorized adverse current, can realize the structure of above-mentioned the 3rd invention.
And; according to the 5th invention; at least one side in above-mentioned winding and inverter circuit is by resin-sealed; and the said temperature testing circuit detects in the structure of temperature of the component parts that is covered by resin at least in this winding and the inverter circuit; by being suitable for the structure of above-mentioned the 1st to the 4th invention; do not stop motor, just can realize the protection of motor.
Description of drawings
Fig. 1 is the figure that the schematic configuration of the related electromotor control circuit of embodiments of the present invention is shown.
Fig. 2 is the schematic diagram that the relation of detected temperatures and current limit value is shown.
Fig. 3 is the figure corresponding with Fig. 2 of the related electromotor control circuit of other execution mode.
Fig. 4 is the figure corresponding with Fig. 1 of the related electromotor control circuit of execution mode in the past.
Fig. 5 is the figure corresponding with Fig. 2 of the related electromotor control circuit of execution mode in the past.
Symbol description
1 control device of electric motor
2,102 motor
3,103 windings
11,111 inverter circuits
12 switch elements
14,114 shunt resistances
21 drive control parts
31 bleeder circuits
32,33 resistive elements (resistive element)
The power supply that 34 signal controlling are used
35 current limit circuits
37 current detection circuits
41,141 temperature sensing circuits
42 transistors (switch element)
43 resistive elements (other resistive element)
44 diodes
The N neutral point
Embodiment
Below, describe embodiments of the present invention in detail according to drawing.In addition, following execution mode is preferred example in essence, and the present invention does not limit the scope of its suitable thing or its purposes.
Fig. 1 represents the control device 1 of the related motor of embodiments of the present invention 2.Motor 2 be by control device 1 in predetermined timing to winding 3,3,3 supply capabilities of stator and not shown rotor is rotated the so-called brushless DC motor of driving with respect to this stator.In addition, above-mentioned motor 2 be its enclosure interior built-in the so-called drive circuit built-in motor of above-mentioned control device 1.And the above-mentioned winding 3,3,3 of above-mentioned motor 2 and inverter circuit described later 11 are by resin-sealed.Here, in the present embodiment, the sealing that utilizes resin to carry out comprises the structure that is covered whole component parts by resin certainly, also comprises the structure that partly covers.In addition, above-mentioned motor 2 has and the general same structure of motor, therefore omits detailed explanation.
For above-mentioned winding 3,3 ..., though diagram especially, with approximate be positioned at annularly axis around mode be wound on the iron core of stator, and with each winding constitute respectively U phase, V reach mutually W mutually the mode of this 3 phase winding interconnect.And, as above-mentioned shown in Figure 1, constitute winding 3,3,3 that above-mentioned U phase, V reach the W phase mutually at one end side interconnect and constitute neutral point N, and another distolateral and above-mentioned control device 1 is connected.
Above-mentioned control device 1 is switched on to each winding 3 of stator in predetermined timing according to the position of rotation of this rotor in order to make rotor rotating speed rotation with regulation in stator.Specifically, above-mentioned control device 1 has: carry out to the ON/OFF (conducting/disconnection) of the energising of the winding 3,3,3 of above-mentioned 3 phases (U phase, V phase, W phase) a plurality of switch elements 12,12 ... the inverter circuit 11 that (being 6 switch elements in the legend) three phase bridge forms; The position of rotation that is used for the rotor that detects according to position of rotation testing circuit 22 is controlled the drive control part 21 of the driving of above-mentioned each switch element 12.
3 switching branches (switching leg) 13a, 13b, 13c connection parallel with one another that above-mentioned inverter circuit 11 forms being connected in series by 2 switch elements 12,12 form, in each switching branches 13a, 13b, 13c, the mid point between the switch element 12,12 is connected with each phase winding 3,3,3 of stator.In addition, in this embodiment, in above-mentioned inverter circuit 11, above-mentioned each switch element 12 is enhancement mode MOSFET, with these each switch element 12 anti-parallel connections be provided with protecting diode.
In addition, one of above-mentioned switching branches 13a, the 13b of above-mentioned inverter circuit 11,13c distolaterally is connected with the side of the positive electrode (hot side) of DC power supply 4, is connected with the negative side (low potential side) of DC power supply 4 and another of this switching branches 13a, 13b, 13c is distolateral.In the following description, the side of the positive electrode with above-mentioned DC power supply 4 in the above-mentioned switch element 12 is connected and the switch element that is positioned at the upstream side of winding 3 is called the upstream side switch element, is connected with the negative side of above-mentioned DC power supply 4 and the switch element that is positioned at the downstream of winding 3 is called the downstream switch element.
The position of rotation of the rotor that the command signal of controller 5 inputs of above-mentioned drive control part 21 bases outside motor and above-mentioned position of rotation testing circuit 22 detect carries out drive controlling to each switch element 12 in the above-mentioned inverter circuit 11.Specifically, above-mentioned drive control part 21 constitutes carries out so-called PWM control, determine the energising timing of above-mentioned upstream side switch element and downstream switch element according to the rotating position signal of pwm signal that generates based on above-mentioned command signal and above-mentioned rotor, and drive each switch element 12.
Specifically, above-mentioned drive control part 21 is in above-mentioned inverter circuit 11, the upstream side switch element is carried out switch control, make and make changing mutually of energising according to per 120 degree of electrical degree, and the downstream switch element is also carried out switch control, make according to per 120 degree of electrical degree, make not by an energising in the switch motion energising mutually of above-mentioned upstream side switch element.Thereby, can in the stator of above-mentioned motor 2, generate rotating magnetic field, in this stator, make the rotor rotation.
In addition, above-mentioned drive control part 21 possesses the current detection circuit 37 of current limit circuit 35 described later, when this current detection circuit 37 detects the electric current that flows into shunt resistance 14 and reaches current limit value, above-mentioned switch element is carried out drive controlling, with the electric current in the above-mentioned inverter circuit 11 of restriction inflow.
Above-mentioned control device 1 possesses the shunt resistance 14 that is connected with the negative side (low potential side) of the DC power supply 4 of above-mentioned inverter circuit 11 and the resistive element 15 that is connected with the side of the positive electrode (hot side) of the DC power supply 4 of this inverter circuit 11.Above-mentioned shunt resistance 14 is used to detect the electric current in the above-mentioned inverter circuit 11, and the loss that takes place when switching in order to be suppressed at constitutes lower low resistance (for example below 1 ohm).In order to be suppressed at the loss that when energising take place, above-mentioned resistive element 15 also constitutes low resistance, and fusion when constituting abnormal current more than taking place to stipulate above-mentioned inverter circuit 11 in.Here, the above abnormal current of regulation is meant the current value that flows through when being different from regular event in the above-mentioned inverter circuit 11, is short-circuited to wait and may cause the component parts this inverter circuit 11 in when flowing through electric current and damage or current value that performance degradation etc. influences in this inverter circuit 11.In addition, as above-mentioned resistive element, also comprise the parts that as fuse etc., fuse.
And above-mentioned control device 1 has: restriction flows into the current limit circuit 35 of the electric current of above-mentioned inverter circuit 11 when the current value of above-mentioned shunt resistance 14 reaches current limit value; Temperature sensing circuit 41 with the temperature of the winding 3 that detects above-mentioned motor 2, inverter circuit 11.
Above-mentioned current limit circuit 35 has: can will flow into the bleeder circuit 31 of the electric current of above-mentioned shunt resistance 14 as voltage detecting; Be arranged in the above-mentioned drive control part 21, when the voltage of these bleeder circuit 31 detections reaches predefined magnitude of voltage (threshold value), detect the current detection circuit 37 that the electric current that flows into above-mentioned shunt resistance 14 reaches above-mentioned current limit value; And transistor 42 described later.
Above-mentioned bleeder circuit 31 has 2 resistive elements 32,33 (resistive element) that are connected in series, an end of the series circuit that is made of these resistive elements 32,33 is connected with the upstream side of above-mentioned shunt resistance 14, and the other end of above-mentioned series circuit is connected with the power supply 34 that signal controlling is used.In addition, above-mentioned bleeder circuit 31 constitutes the voltage (the following intermediate voltage that also is called) of the centre of 2 resistive elements 32,33 is exported to above-mentioned drive control part 21.That is, in the above-mentioned bleeder circuit 31, read in the dividing potential drop that the ratio that utilizes above-mentioned resistive element 32,33 is obtained by drive control part 21.
Specifically, change if flow into the electric current of above-mentioned shunt resistance 14, the amount of the voltage drop of this shunt resistance 14 correspondingly changes, and the voltage of an end of the above-mentioned bleeder circuit 31 that is connected with the upstream side of this shunt resistance 14 also changes.Like this, because the intermediate voltage that the ratio of the resistive element 32,33 by above-mentioned bleeder circuit 31 is obtained also changes, therefore can detect the variation of voltages by above-mentioned drive control part 21.In addition, in above-mentioned Fig. 1, the electric capacity that symbol 36 expressions are worked as being used to reduce the noise filter of the noise in the above-mentioned bleeder circuit 31.
Above-mentioned current detection circuit 37 constitutes when the voltage that is detected by above-mentioned bleeder circuit 31 reaches pre-set threshold, detects the electric current that flows into above-mentioned shunt resistance 14 and reaches above-mentioned current limit value.Specifically, above-mentioned current detection circuit 37 constitutes, voltage when the electric current that flows into above-mentioned shunt resistance 14 is reached current limit value is set at above-mentioned threshold value, when the voltage that is detected by above-mentioned bleeder circuit 31 reaches above-mentioned threshold value, when the electric current that promptly flows into above-mentioned shunt resistance 14 reaches current limit value, the export-restriction signal.Thereby, carry out drive controlling by the switch element 12 in 21 pairs of these inverter circuits of above-mentioned drive control part 11, flow into the electric current of above-mentioned inverter circuit 11 with restriction.
Said temperature testing circuit 41 constitutes: the temperature that detects the winding 3 and the inverter circuit 11 of above-mentioned motor 2, when their temperature does not reach set point of temperature, output signal (or output high level (High) signal), and when said temperature reaches set point of temperature, stop signal output (or output low level (Low) signal).Export to the control terminal (base terminal) of transistor 42 (switch element) from the signal of these temperature sensing circuit 41 outputs, to be used to control the switch motion of this transistor 42.In addition, in the present embodiment, said temperature testing circuit 41 constitutes the winding 3 of detection motor 2 and the temperature of inverter circuit 11, but is not limited thereto, and also can only detect either party's temperature.
Above-mentioned transistor 42 for example is made of bipolar transistor, its collector electrode side is connected with the resistive element 43 that is connected in series (other resistive element) and the mid point of diode 44, and the low potential side (representing with downward triangle among the figure) in emitter side and the control device 1 is connected.The series circuit of these resistive elements 43 and diode 44 is connected with the power supply 34 that signal controlling is used at an end of these resistive element 43 sides, and is connected to 32,33 of the resistive elements of above-mentioned bleeder circuit 31 at the other end of above-mentioned diode 44 sides.In addition, above-mentioned diode 44 connects in the mode that anode-side is positioned at the collector electrode side of above-mentioned transistor 42, with allowable current only from above-mentioned bleeder circuit 31 sides of above-mentioned resistive element 43 side inflows.
By such structure, when the temperature that is judged to be winding 3 and inverter circuit 11 by said temperature testing circuit 41 does not reach set point of temperature, above-mentioned transistor 42 becomes conducting state, and electric current flows into low potential side from collector electrode side, the emitter side of above-mentioned power supply 34 orders by this transistor 42.On the other hand, when judging that by said temperature testing circuit 41 said temperature reaches set point of temperature, above-mentioned transistor 42 becomes nonconducting state, because electric current is inflow transistor 42 not, therefore, because above-mentioned power supply 34, the collector electrode side of this transistor 42 is that the current potential of the anode-side of above-mentioned diode 44 rises to such an extent that be higher than cathode side, and this diode 44 becomes conducting state.Thereby resistive element 43 is electrically connected to above-mentioned bleeder circuit 31, and the resistive element 33 of this resistive element 43 and bleeder circuit 31 becomes and is connected in parallel.Thereby the resistance in the above-mentioned bleeder circuit 31 correspondingly reduces, and in this bleeder circuit 31, the voltage of the part of above-mentioned resistive element 33,43 relatively uprises.
Here, in above-mentioned current limit circuit 35, being judged to be the magnitude of voltage (threshold value) that reaches current limit value does not change, if therefore thereby the voltage of the above-mentioned resistive element 33,43 of the resistance of above-mentioned bleeder circuit 31 reduction uprises, the variation in voltage that then above-mentioned shunt resistance 14 is allowed diminishes, and the current limit value that flows into the electric current of this shunt resistance 14 correspondingly reduces.
Promptly, by adopting said structure, when the temperature that detects winding 3 and inverter circuit 11 at said temperature testing circuit 41 reaches set point of temperature (limit temperature), can reduce the resistance of above-mentioned bleeder circuit 31, the current limit value that flows into the electric current in the above-mentioned shunt resistance 14 is reduced to greater than zero setting.
The effect of-execution mode-
As mentioned above, according to this execution mode, when the temperature of winding 3 and inverter circuit 11 reaches set point of temperature, with resistive element 43 with the electric current that flows into shunt resistance 14 bleeder circuit 31 as voltage detecting can be connected in parallel, reduce the resistance in this bleeder circuit 31, thereby can not change the threshold value of the voltage that detects in current limit circuit 35 sides, and the current limit value of the electric current that flows into above-mentioned shunt resistance 14 is reduced to greater than zero setting.Therefore, can change current limit value according to said temperature, the temperature that suppresses above-mentioned winding 3 and inverter circuit 11 rises, even said temperature reached more than the set point of temperature as in the past, also needn't stop motor 2.Thereby,, needn't carry out restarting because of the controller that stops to cause 5 of above-mentioned motor 2 by above-mentioned structure.
And, as mentioned above, when said temperature reaches set point of temperature,, can not stop motor 2 by reducing the current limit value of the electric current that flows into shunt resistance 14, be driven into to greatest extent with respect to allowing the output rotation and make this motor 2.
In addition, in order to reduce the resistance in the bleeder circuit 31 as described above, adopt and made up the circuit of resistive element 43, transistor 42 and diode 44, thereby can realize to obtain the circuit structure of above-mentioned effect simple and reliablely.
" other execution mode "
For above-mentioned execution mode, also can adopt following formation.
In the above-mentioned execution mode, the structure that has adopted the action by transistor 42 that resistive element 43 and this bleeder circuit 31 are connected in parallel for the resistance that reduces bleeder circuit 31, but be not limited thereto, so long as the current limit value that flows into the electric current of shunt resistance 14 can be reduced to structure, then can be any structure greater than zero setting.For example, also can be to adopt microcomputer etc., make the structure of above-mentioned current limit value variation according to the temperature of winding 3 and inverter circuit 11.
In addition, in the above-mentioned execution mode, only be provided with a limit temperature (set point of temperature) of winding 3 and inverter circuit 11, but as shown in Figure 3, a plurality of (being these 2 of the 1st limit temperature, the 2nd limit temperatures in the legend) also can be set, to reduce current limit value steppedly.Such structure example realizes as adopting microcomputer etc. according to said temperature above-mentioned current limit value to be changed.
In addition, in the above-mentioned execution mode,, still be not limited thereto for above-mentioned bleeder circuit 31 being connected in parallel with resistive element 43 and having adopted transistor 42, so long as the structure that can carry out switch motion according to the temperature of winding 3 and inverter circuit 11 then can be an arbitrary structures.
In addition, in the above-mentioned execution mode,, but be not limited thereto, also can seal the either party by resin-sealed winding 3,3,3 and inverter circuit 11 these two sides.At this moment, the temperature that detects a side's who is covered by resin component parts at least gets final product.
And, in the above-mentioned execution mode, inverter circuit 11 is connected with DC power supply 4, but is not limited thereto, also can be connected with supply unit with AC power, converter circuit and smoothing capacity.
[possibility of utilizing on the industry]
As mentioned above, the present invention is particularly useful for controlling so that flow into the control circuit that the electric current of the shunt resistance that is connected with the low potential side of inverter circuit is no more than current limit value and controls motor according to the temperature of winding and above-mentioned inverter circuit.
Claims (5)
1. a control device of electric motor has: at the inverter circuit of predetermined timing to the winding energising; And when the electric current that flows into the shunt resistance that is connected with the low potential side of this inverter circuit reached current limit value, restriction flowed into the current limit circuit of the electric current of above-mentioned inverter circuit, it is characterized in that,
Temperature sensing circuit with the temperature that detects at least one side in above-mentioned winding and the inverter circuit,
When above-mentioned current limit circuit reaches set point of temperature at the said temperature that is detected by the said temperature testing circuit, make above-mentioned current limit value be reduced to setting greater than zero according to the output of this temperature sensing circuit.
2. control device of electric motor according to claim 1 is characterized in that,
Above-mentioned current limit circuit reduces above-mentioned current limit value according to the said temperature that is detected by the said temperature testing circuit steppedly.
3. control device of electric motor according to claim 1 and 2 is characterized in that,
Above-mentioned current limit circuit has:
Bleeder circuit has a plurality of resistive elements, the electric current that flows into above-mentioned shunt resistance can be detected as voltage;
Current detection circuit when reaching pre-set threshold by the detected voltage of above-mentioned bleeder circuit, detects the electric current that flows into above-mentioned shunt resistance and reaches above-mentioned current limit value; And
Switch element moves according to the output of said temperature testing circuit, so that when the said temperature that is detected by the said temperature testing circuit reaches set point of temperature, reduce the resistance value of above-mentioned bleeder circuit, thereby reduce above-mentioned current limit value.
4. control device of electric motor according to claim 3 is characterized in that,
Above-mentioned switch element is made of transistor, and its control terminal is connected with the outlet side of said temperature testing circuit, and by switch motion the resistive element in other resistive element and the above-mentioned bleeder circuit is connected in parallel,
In the bleeder circuit side of above-mentioned switch element, the mode that is positioned at this switch element side with anode-side is provided with diode.
5. according to each described control device of electric motor of claim 1 to 4, it is characterized in that,
At least one side of above-mentioned winding and inverter circuit is by resin-sealed,
The said temperature testing circuit detect in above-mentioned winding and the inverter circuit at least by the temperature of above-mentioned resin-sealed component parts.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009013213A JP5377989B2 (en) | 2009-01-23 | 2009-01-23 | Motor control device |
| JP2009-013213 | 2009-01-23 |
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|---|---|
| CN101789752A true CN101789752A (en) | 2010-07-28 |
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| CN201010106684A Pending CN101789752A (en) | 2009-01-23 | 2010-01-22 | Control device of electric motor |
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| CN107093974A (en) * | 2016-02-17 | 2017-08-25 | 发那科株式会社 | Control device of electric motor and method of motor control |
| CN107251411A (en) * | 2015-02-23 | 2017-10-13 | 三菱电机株式会社 | Vidacare corp and its control method |
| CN107925378A (en) * | 2015-08-18 | 2018-04-17 | 日本电产伺服有限公司 | Motor unit |
| CN111245323A (en) * | 2018-11-28 | 2020-06-05 | 广东美的白色家电技术创新中心有限公司 | Motor control method and device, computer readable storage medium and electrical equipment |
| CN111654228A (en) * | 2020-06-11 | 2020-09-11 | 上海有个机器人有限公司 | Torque control method and device of motor, controller and motor |
| CN112564588A (en) * | 2020-12-16 | 2021-03-26 | 安乃达驱动技术(上海)股份有限公司 | Temperature protection method and system for hub system of electric bicycle |
| WO2021120920A1 (en) * | 2019-12-17 | 2021-06-24 | 青岛海尔空调电子有限公司 | Winding temperature determining method and starting method for three-phase compressor, and air conditioner |
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| JP5904181B2 (en) * | 2013-09-20 | 2016-04-13 | 株式会社デンソー | Motor control device |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2010172124A (en) | 2010-08-05 |
| JP5377989B2 (en) | 2013-12-25 |
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Application publication date: 20100728 |