CN105890811A - Motor temperature rise measurement method - Google Patents
Motor temperature rise measurement method Download PDFInfo
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- CN105890811A CN105890811A CN201610219404.9A CN201610219404A CN105890811A CN 105890811 A CN105890811 A CN 105890811A CN 201610219404 A CN201610219404 A CN 201610219404A CN 105890811 A CN105890811 A CN 105890811A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K17/00—Measuring quantity of heat
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Abstract
The invention discloses a motor temperature rise measurement method. A motor three-order thermal model is built, and through a discrete matrix equation as shown in the specification corresponding to the three-order thermal model, real-time temperature rise of each part of the motor is calculated and obtained. Through measuring the temperature rise of the motor by the three-order thermal model, thermal gathering and cooling conditions of the motor are both considered, and a more accurate temperature rise measurement result is obtained.
Description
Technical field
The present invention relates to a kind of temperature rise measuring method, particularly a kind of motor temperature measuring method.
Background technology
When thermal overload occurs, the decisive factor to motor harm is absolute temperature, and the too high meeting of temperature makes insulation ag(e)ing, shortens motor life, even results in insulation breakdown.Measure now motor temperature engineer applied widely used single order thermal model, using stator current size as Protection criteria, it is contemplated that the low power overload of motor allows a specified time, so mostly using the motor overload protection characteristic with anti-time limit characteristic.But this motor protection based on electric current anti-time limit characteristic has certain limitation, it is impossible to consider the heat accumulation process of motor, therefore, it is difficult to the protection problem solved under motor frequent low power overload and current fluctuation；Do not consider the heat dispersal situations of motor simultaneously.Thus cannot accurately measure and obtain the real-time condition that electronic built-in temperature raises.
Summary of the invention
The technical problem to be solved is to provide a kind of motor temperature measuring method, and it can be taken into account motor heat accumulation and heat dispersal situations, accurately obtain motor temperature rise process.
For solving above-mentioned technical problem, the technical solution adopted in the present invention is:
A kind of motor temperature measuring method, it is characterised in that: setting up motor three rank thermal model, thermal model structure is, support and RcaseOne end ground connection, RcaseThe other end and Ryoke、Rew、RshaftOne end connect, RyokeThe other end and Rteeth、Cstator、PirOne end connect, CstatorAnd PirOther end ground connection, RewThe other end and Ccoil、Pjs、RcoilOne end connect, CcoilAnd PjsOther end ground connection, RteethThe other end and RcoilThe other end and RairOne end connect, RshaftAnd RairThe other end and CrotorAnd PjrOne end connect, CrotorAnd PjrOther end ground connection, wherein RyokeIt is thermal resistance between stator core and support, RcaseIt is thermal resistance between support and extraneous air, RteethIt is thermal resistance between stator teeth groove and iron core, RcoilIt is thermal resistance between stator winding and teeth groove, RshaftIt is thermal resistance between rotating shaft and support, RairIt is air gap thermal resistance, RewIt is thermal resistance between Stator End Winding and end cap, CcoilIt is stator winding thermal capacitance, CrotorIt is rotor thermal capacitance, CstatorIt is stator core thermal capacitance, PirIt is the heat of stator copper loss generation, PjsIt is the heat of stator iron loss generation, PjrIt it is the heat of rotor copper loss generation；By discrete matrix equation θ [(k+1) the T]=C that three rank thermal models are corresponding-1Eθ(kT)+C-1BP (kT)=F θ (kT)+GP (kT) is calculated the real-time temperature rise of motor each several part.
Further, F, G coefficient matrix of the discrete matrix equation that described three rank thermal models are corresponding is calculated by the thermal resistance in thermal model and thermal capacitance, and thermal resistance, the calculating of thermal capacitance depend on physical dimension and the Material Thermodynamics coefficient of motor.
Further, when physical dimension the unknown of motor when, estimate other desired structure sizes by design of electrical motor nominal parameter that is theoretical and that provide with reference to Y or Y2 serial motors design manual and stock size.
Further, described estimation process is, theoretical according to design of electrical motor, the value of the close Bi1 of stator tooth magnetic between 1.40～1.60T, its mean value 1.50T；In addition to some 2 pole motor, stator yoke magnetic close Bj1 value, between 1.10～1.50T, takes its mean value 1.30T；The close Bi2 of rotor tooth magnetic is typically between 1.25～1.60T, and taking its mean value is 1.4T；In like manner the close Bj2 of rotor yoke magnetic averages as 1.4T, applies the close computing formula of tooth magnetic:The close computing formula of yoke magnetic:Air gap flux density B δ computing formula:And every pole magnetic flux computing formula:Provide data in conjunction with design manual, estimate the overall dimension of stator and rotor grooved.
The present invention compared with prior art, has the following advantages and effect:
1, by three rank thermal models, motor temperature is measured, taken into account motor heat accumulation and heat dispersal situations, thus obtained temperature measurement result more accurately；
2, motor inner structure unknown situation is taken into account, by the parameter of the theoretical internal structure motor unknown with the estimation of Y or Y2 serial motors design manual of design of electrical motor, it is provided that the acquisition way of the structural parameters under internal structure of motor unknown situation, more convenient to use.
Accompanying drawing explanation
Fig. 1 is the third-order model schematic diagram of a kind of motor temperature measuring method of the present invention.
Fig. 2 is temperature measurement and the thermal model result of calculation comparison diagram of the present invention.
Detailed description of the invention
The present invention is described in further detail below in conjunction with the accompanying drawings and by embodiment, and following example are explanation of the invention and the invention is not limited in following example.
As it can be seen, a kind of motor temperature measuring method of the present invention, setting up motor three rank thermal model, thermal model structure is, support and RcaseOne end ground connection, RcaseThe other end and Ryoke、Rew、RshaftOne end connect, RyokeThe other end and Rteeth、Cstator、PirOne end connect, CstatorAnd PirOther end ground connection, RewThe other end and Ccoil、Pjs、RcoilOne end connect, CcoilAnd PjsOther end ground connection, RteethThe other end and RcoilThe other end and RairOne end connect, RshaftAnd RairThe other end and CrotorAnd PjrOne end connect, CrotorAnd PjrOther end ground connection, wherein RyokeIt is thermal resistance between stator core and support, RcaseIt is thermal resistance between support and extraneous air, RteethIt is thermal resistance between stator teeth groove and iron core, RcoilIt is thermal resistance between stator winding and teeth groove, RshaftIt is thermal resistance between rotating shaft and support, RairIt is air gap thermal resistance, RewIt is thermal resistance between Stator End Winding and end cap, CcoilIt is stator winding thermal capacitance, CrotorIt is rotor thermal capacitance, CstatorIt is stator core thermal capacitance, PirIt is the heat of stator copper loss generation, PjsIt is the heat of stator iron loss generation, PjrIt it is the heat of rotor copper loss generation；By discrete matrix equation θ [(k+1) the T]=C that three rank thermal models are corresponding-1Eθ(kT)+C-1BP (kT)=F θ (kT)+GP (kT) is calculated the real-time temperature rise of motor each several part.In formula: F, G coefficient matrix；P (t) loss matrix, θ (t) temperature rise matrix.
F, G coefficient matrix of the discrete matrix equation that three rank thermal models are corresponding is calculated by the thermal resistance in thermal model and thermal capacitance, and thermal resistance, the calculating of thermal capacitance depend on physical dimension and the Material Thermodynamics coefficient of motor.Thermodynamics coefficient not only with the material behavior of motor about also with heat radiation time air velocity relevant, typically cannot be carried out calculating accurately, so mostly using empirical value, and the physical dimension of required motor is accurate to the grooved parameter of motor.
When physical dimension the unknown of motor when, estimate other desired structure sizes by design of electrical motor nominal parameter that is theoretical and that provide with reference to Y or Y2 serial motors design manual and stock size.Estimation process is:
Parameter and size that every kind of specification motor is given by design of electrical motor handbook are as follows:
1) rated power, the stator current of full load, rotating speed, efficiency and power factor；
2) locked rotor current multiple, locked-rotor torque multiple and torque capacity multiple；
3) the inside and outside footpath of core length, gas length and stator；
4) stator line rule, every line of rabbet joint number, parallel branch number, winding configuration and pitch；
5) stator and rotor groove number.
Theoretical according to design of electrical motor, the value of the close Bi1 of stator tooth magnetic between 1.40～1.60T, its mean value 1.50T；In addition to some 2 pole motor, stator yoke magnetic close Bj1 value, between 1.10～1.50T, takes its mean value 1.30T；The close Bi2 of rotor tooth magnetic is typically between 1.25～1.60T, and taking its mean value is 1.4T；In like manner the close Bj2 of rotor yoke magnetic averages as 1.4T, application
The close computing formula of tooth magnetic:
The close computing formula of yoke magnetic:
Air gap flux density B δ computing formula:
And every pole magnetic flux computing formula:
Providing data in conjunction with design manual, estimate the overall dimension of stator and rotor grooved, estimation obtains the parameters such as the stator winding heat dissipation area needed for three rank thermal model parameters calculate further.
Experimental verification:
Experiment porch uses Magtrol system to control the running status of motor, and is connected by current sensor with protection system hardware by motor.In motor, pre-buried 5 thermal resistances are used for measuring the real-time temperature rise of motor.Fig. 2 is temperature measurement and the contrast of thermal model result of calculation, and in figure, curve is from top to bottom followed successively by that axle stretches (load) side maximum temperature, three rank thermal model result of calculations, non-axle stretch (fan) side maximum temperature, single order thermal model result of calculation.The maximum temperaturerise that visible three rank thermal models calculate is the most identical with actual measurement temperature rise, and stretches side and non-axle is stretched the accuracy rate of its thermotonus between the winding overhang temperature rise of side and is higher than the first order modeling computational methods of prior art between the axle of actual measurement.
Above content described in this specification is only illustration made for the present invention.Described specific embodiment can be made various amendment or supplements or use similar mode to substitute by those skilled in the art; without departing from the content of description of the invention or surmount scope defined in the claims, protection scope of the present invention all should be belonged to.
Claims (4)
1. a motor temperature measuring method, it is characterised in that: setting up motor three rank thermal model, thermal model is tied
Structure is, support and RcaseOne end ground connection, RcaseThe other end and Ryoke、Rew、RshaftOne end connect, Ryoke
The other end and Rteeth、Cstator、PirOne end connect, CstatorAnd PirOther end ground connection, RewAnother
One end and Ccoil、Pjs、RcoilOne end connect, CcoilAnd PjsOther end ground connection, RteethThe other end with
RcoilThe other end and RairOne end connect, RshaftAnd RairThe other end and CrotorAnd PjrOne end even
Connect, CrotorAnd PjrOther end ground connection, wherein RyokeIt is thermal resistance between stator core and support, RcaseIt it is machine
Thermal resistance between seat and extraneous air, RteethIt is thermal resistance between stator teeth groove and iron core, RcoilIt is stator winding and tooth
Thermal resistance between groove, RshaftIt is thermal resistance between rotating shaft and support, RairIt is air gap thermal resistance, RewIt it is Stator End Winding
And thermal resistance between end cap, CcoilIt is stator winding thermal capacitance, CrotorIt is rotor thermal capacitance, CstatorIt is stator core heat
Hold, PirIt is the heat of stator copper loss generation, PjsIt is the heat of stator iron loss generation, PjrIt is that rotor copper loss produces
Raw heat；By the discrete matrix equation that three rank thermal models are corresponding
θ [(k+1) T]=C-1Eθ(kT)+C-1BP (kT)=F θ (kT)+GP (kT) is calculated motor each several part
Temperature rise in real time.
2. according to a kind of motor temperature measuring method described in claim 1, it is characterised in that: described three rank heat
F, G coefficient matrix of the discrete matrix equation that model is corresponding is to be calculated by the thermal resistance in thermal model and thermal capacitance
Obtaining, thermal resistance, the calculating of thermal capacitance depend on physical dimension and the Material Thermodynamics coefficient of motor.
3. according to a kind of motor temperature measuring method described in claim 2, it is characterised in that: when the knot of motor
The when of structure size the unknown, and reference Y or Y2 serial motors design manual theoretical by design of electrical motor is given
Nominal parameter and stock size estimate other desired structure sizes.
4. according to a kind of motor temperature measuring method described in claim 3, it is characterised in that:
Described estimation process is, theoretical according to design of electrical motor, the value of the close Bi1 of stator tooth magnetic is 1.40～1.60T
Between, its mean value 1.50T；In addition to some 2 pole motor, stator yoke magnetic close Bj1 value is 1.10～1.50T
Between, take its mean value 1.30T；The close Bi2 of rotor tooth magnetic, typically between 1.25～1.60T, takes it average
Value is 1.4T；In like manner the close Bj2 of rotor yoke magnetic averages as 1.4T, applies the close computing formula of tooth magnetic:The close computing formula of yoke magnetic:Gap magnetic close B δ computing formula:
And every pole magnetic flux computing formula:Provide data in conjunction with design manual, estimate
The overall dimension of stator and rotor grooved.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769797A (en) * | 2009-01-06 | 2010-07-07 | 李虎 | Temperature rise analytical method for predicting temperature of permanent magnet in permanent magnet synchronous motor |
| CN101806642A (en) * | 2010-04-09 | 2010-08-18 | 福州大学 | Virtual testing method of distribution of three-dimensional temperature fields for motor operation based on simulation model |
| CN102654423A (en) * | 2011-03-03 | 2012-09-05 | 通用汽车环球科技运作有限责任公司 | Motor temperature estimation based on thermal model |
| CN205091740U (en) * | 2015-11-18 | 2016-03-16 | 哈尔滨理工大学 | Three -phase induction motor transient temperature rise computation model |
-
2016
- 2016-04-08 CN CN201610219404.9A patent/CN105890811B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769797A (en) * | 2009-01-06 | 2010-07-07 | 李虎 | Temperature rise analytical method for predicting temperature of permanent magnet in permanent magnet synchronous motor |
| CN101806642A (en) * | 2010-04-09 | 2010-08-18 | 福州大学 | Virtual testing method of distribution of three-dimensional temperature fields for motor operation based on simulation model |
| CN102654423A (en) * | 2011-03-03 | 2012-09-05 | 通用汽车环球科技运作有限责任公司 | Motor temperature estimation based on thermal model |
| CN205091740U (en) * | 2015-11-18 | 2016-03-16 | 哈尔滨理工大学 | Three -phase induction motor transient temperature rise computation model |
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