CN101212197B - AC motor system with variable number of pole pairs for electric automobile - Google Patents
AC motor system with variable number of pole pairs for electric automobile Download PDFInfo
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- CN101212197B CN101212197B CN2006100645492A CN200610064549A CN101212197B CN 101212197 B CN101212197 B CN 101212197B CN 2006100645492 A CN2006100645492 A CN 2006100645492A CN 200610064549 A CN200610064549 A CN 200610064549A CN 101212197 B CN101212197 B CN 101212197B
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Abstract
The invention discloses an AC motor system with log of variable levels in an electric vehicle, which comprises an AC motor with log of variable levels, a level changing switch, a level changing controller, a speed sensor, and an electricity supplying unit including DC power and a frequency converter, wherein, the CD power supplies variable frequency AC through the frequency converter to provide electricity for the AC motor with log of variable levels; the level changing switch is used for switching the log of variable levels of the AC motor with log of variable levels; the speed sensor detects the rotational speed of the AC motor with log of variable levels and transfers a rotational speed signal to the level changing controller and then carries out on-off state of the level changing switch according to the rotational speed. By adopting the invention, the motor can keep reasonable dynamic characteristics constantly under different rotational speeds and reduce the extra weight and mechanical abrasion on a bodywork due to the application of a mechanical transmission.
Description
Technical field
The present invention relates to a kind of electric automobile electric motor system, particularly relate to a kind of employing pole-changing logarithm AC motor system.
Background technology
The AC motor system of existing electric automobile generally adopts the alternating current motor of fixed pole logarithm as power.This mode is difficult to guarantee that electric automobile keeps suitable dynamic characteristics at low speed in big velocity interval at a high speed.Its reason is, the alternating current motor of equal-wattage, and when the same slow-speed of revolution, the low speed torque that number of pole-pairs is many is few greater than number of pole-pairs.At height when certain rotating speed, same high rotating speed, high torque that number of pole-pairs is few is many greater than number of pole-pairs.The N-M of AC asynchronous motor as shown in Figure 1 (rotating speed-moment of torsion) curve, the N-M curve that has shown the motor of the following 2 pairs of utmost points of equal-wattage and 4 pairs of utmost points among the figure, under the motor speed condition below 3200 rev/mins, the motor torque of 4 pairs of utmost points is greater than the motor torque of 2 pairs of utmost points; Under the motor speed condition more than 3200 rev/mins, the motor torque of 4 pairs of utmost points is then less than the motor torque of 2 pairs of utmost points.Alternating current motor rotating speed-the torque characteristic of this fixed pole logarithm can not satisfy the power needs of electric automobile when friction speed is moved.The existing general mechanical transmission that adopts carries out speed Control, and this will increase the weight of vehicle body and produce mechanical wear.
Summary of the invention
The technical problem that the present invention solves provides a kind of AC motor system of electric power characteristic when utilizing non-mechanical approach to improve the high low speed of electric automobile to switch.
Electric automobile pole-changing logarithm AC motor system of the present invention comprises: pole-changing logarithm alternating current motor, pole changing switch, change poles controller, velocity transducer, power supply unit; Power supply unit provides working power for pole-changing logarithm alternating current motor, and pole changing switch is used for that pole-changing logarithm alternating current motor is carried out the pole-changing logarithm and switches; Velocity transducer detects the rotating speed of pole-changing logarithm alternating current motor, and tach signal is sent to the change poles controller, and the change poles controller carries out break-make control according to the rotating speed size to pole changing switch.
Preferably, described pole-changing logarithm alternating current motor is the bipolar logarithm alternating current motor with two numbers of pole-pairs, when the rotating speed of bipolar logarithm alternating current motor surpassed threshold value, the break-make of change poles controller control pole changing switch reduced the work number of pole-pairs of bipolar logarithm alternating current motor; When the rotating speed of bipolar logarithm alternating current motor was lower than threshold value, the break-make of change poles controller control pole changing switch increased the work number of pole-pairs of bipolar logarithm alternating current motor.
Preferably, when the winding of bipolar logarithm alternating current motor is connected into YY shape, adopt three pole changing switches: pole changing switch K1, pole changing switch K2, pole changing switch K3; Bipolar logarithm alternating current motor is made up of the 1st group of winding and the 2nd group of winding; One end of three windings of the 1st group of winding links together and constituted for the 1st star zero point, and the other end is connected respectively with an end of three windings of the 2nd group of winding and draws tap; The other end of three windings of the 2nd group of winding is an input, is used to connect pole changing switch; Pole changing switch K1 is between frequency converter and bipolar logarithm alternating current motor, and an end links to each other with the input of three windings of the 2nd group of winding, and the other end links to each other with the output of frequency converter; Pole changing switch K2 is between frequency converter and bipolar logarithm alternating current motor, and an end and two groups of windings three tap terminals of contact mutually link to each other, and the other end links to each other with the output of frequency converter; 2nd star of pole changing switch K3 in bipolar logarithm alternating current motor and circuit is between zero point, and an end links to each other with the input of three windings of the 2nd group of winding, and the other end links to each other with the 2nd star zero point; When the rotating speed of bipolar logarithm alternating current motor surpassed threshold value, change poles controller control pole changing switch K1 disconnected, and pole changing switch K2, pole changing switch K3 connect; When the rotating speed of bipolar logarithm alternating current motor was lower than threshold value, change poles controller control pole changing switch K1 connected, and pole changing switch K2, pole changing switch K3 disconnect.
Preferably, when the winding of bipolar logarithm alternating current motor is connected into A shape, adopt two pole changing switches: pole changing switch K4, pole changing switch K5; Bipolar logarithm alternating current motor is made up of the 1st group of winding and the 2nd group of winding; The 1st group of winding has tapped winding by three and forms tap and be used to connect pole changing switch, presses triangle and connects; The 2nd group of winding is made up of three windings, and an end of each winding is connected on the triangular apex of the 1st group of winding that triangle connects, and the other end is an input, is used to connect pole changing switch; Pole changing switch K4 is between power supply unit and bipolar logarithm alternating current motor, and an end links to each other with three inputs of the 2nd group of winding, and the other end links to each other with the output of frequency converter; Pole changing switch K5 is between power supply unit and bipolar logarithm alternating current motor, and an end links to each other with three tap terminals of the 1st group of winding, and the other end links to each other with the output of frequency converter; When the rotating speed of bipolar logarithm alternating current motor surpassed threshold value, change poles controller control pole changing switch K4 disconnected, and pole changing switch K5 connects; When the rotating speed of bipolar logarithm alternating current motor was lower than threshold value, change poles controller control pole changing switch K4 connected, and pole changing switch K5 disconnects.1/2 place that the tap of described the 1st group of winding is positioned at winding adopts pole-changing logarithm AC motor system of the present invention to have following technique effect:
1. electric automobile uses the how fast alternating current motor of pole-changing logarithm to carry out step speed change, makes electric automobile keep suitable dynamic characteristics in velocity interval, though when electric automobile had not only satisfied the requirement while of low-speed big but also had satisfied high speed to the requirement of moment of torsion.
2. adopt the present invention can make electric automobile not use mechanical transmission and realize automatic shift control, avoid using additional weight that mechanical transmission brings to vehicle body and mechanical wear etc.
Description of drawings
Fig. 1 is the N-M curve chart of the alternating current motor of 2 pairs of utmost points of equal-wattage and 4 pairs of utmost points;
Fig. 2 is the bipolar logarithm AC motor system schematic diagram of YY connection in the preferred embodiment of the present invention;
Fig. 3 is the electric motor car power section schematic diagram of band driving wheel in Fig. 2 preferred embodiment of the present invention;
Fig. 4 is the bipolar logarithm AC motor system schematic diagram of A connection in the preferred embodiment of the present invention;
Fig. 5 is the electric motor car power section schematic diagram of band driving wheel in Fig. 4 preferred embodiment of the present invention.
Embodiment
Below by embodiment, and the present invention is described in detail in conjunction with the accompanying drawings.
The bipolar logarithm AC motor system of YY connection as shown in Figure 2, system comprises: the bipolar logarithm alternating current motor of YY connection, pole changing switch K1, pole changing switch K2, pole changing switch K3, change poles controller, velocity transducer, power supply unit.Power supply unit comprises DC power supply and frequency converter, and DC power supply provides the frequency-changing AC electricity to be the alternating current motor power supply by frequency converter.Pole changing switch K1, pole changing switch K2 are between frequency converter and bipolar logarithm alternating current motor, 2nd star of pole changing switch K3 in bipolar logarithm alternating current motor and circuit is between zero point, one end links to each other with the input of three windings of the 2nd group of winding, and the other end links to each other with the 2nd star zero point; Pole changing switch K1 one end links to each other with the input of three windings of the 2nd group of winding, and the other end links to each other with the output of frequency converter; Pole changing switch K2 one end and two groups of windings three tap terminals of contact mutually link to each other, and the other end links to each other with the output of frequency converter.The rotating speed of velocity transducer dynamic monitoring motor, the tach signal that change poles controller inbound pacing transducer is beamed back.When the rotating speed of bipolar logarithm alternating current motor surpassed threshold value, change poles controller control pole changing switch K1 disconnected, and pole changing switch K2, pole changing switch K3 connect, and make motor be operated in the number of pole-pairs less state; When the rotating speed of bipolar logarithm alternating current motor was lower than threshold value, change poles controller control pole changing switch K1 connected, and pole changing switch K2, pole changing switch K3 disconnect, and make motor be operated in the more state of number of pole-pairs.
Increase the power section that transmission mechanism and drive wheels have just constituted electric motor car as shown in Figure 3 on the electric motor system of Fig. 2, the power of bipolar logarithm alternating current motor drives drive wheels by transmission mechanism and rotates, thereby electric motor car is travelled.
The bipolar logarithm AC motor system of A connection as shown in Figure 4, system comprises: the bipolar logarithm alternating current motor of A connection, pole changing switch K4, pole changing switch K5, change poles controller, velocity transducer, power supply unit.Power supply unit comprises DC power supply and frequency converter, and DC power supply provides the frequency-changing AC electricity to be the alternating current motor power supply by frequency converter.Pole changing switch K4, pole changing switch K5 are between frequency converter and bipolar logarithm alternating current motor, and pole changing switch K4 one end links to each other with three inputs of the 2nd group of winding, and the other end links to each other with the output of frequency converter; Pole changing switch K5 one end links to each other with three tap terminals of the 1st group of winding, and the other end links to each other with the output of frequency converter.The rotating speed of velocity transducer dynamic monitoring motor, the tach signal that change poles controller inbound pacing transducer is beamed back.When the rotating speed of bipolar logarithm alternating current motor surpassed threshold value, change poles controller control pole changing switch K4 disconnected, and pole changing switch K5 connects, and makes motor be operated in the number of pole-pairs less state; When the rotating speed of bipolar logarithm alternating current motor was lower than threshold value, change poles controller control pole changing switch K4 connected, and pole changing switch K5 disconnects, and makes motor be operated in the more state of number of pole-pairs.
Increase the power section that transmission mechanism and drive wheels have just constituted electric motor car as shown in Figure 5 on the electric motor system of Fig. 4, the power of bipolar logarithm alternating current motor drives drive wheels by transmission mechanism and rotates, thereby electric motor car is travelled.
The N-M curve of the alternating current motor of the following 2 pairs of utmost points of equal-wattage and 4 pairs of utmost points as shown in Figure 1.Suppose that the pole-changing logarithm alternating current motor that electric automobile adopts is the bipolar logarithm alternating current motor of the 2 pairs of utmost point/4 pair utmost points, when rotating speed is 3200 rev/mins, carry out number of pole-pairs as shown in Figure 1 and switch, can make motor continue to obtain satisfied dynamic characteristics.Promptly when the rotating speed of motor surpasses 3200 rev/mins, switch to 2 pairs of utmost point alternating current motor operating states, when the rotating speed of motor is lower than 3200 rev/mins, switch to 4 pairs of utmost point alternating current motor operating states.Can adopt the motor that surpasses two numbers of pole-pairs in addition, will be to there be a plurality of speed governing levels this moment, be that the high more break-make by change poles controller control pole changing switch of the rotating speed of motor is chosen under the few more mode of number of pole-pairs and works, the low more break-make by change poles controller control pole changing switch of rotating speed is chosen under the many more modes of number of pole-pairs works.
In sum, the present invention is by use pole-changing logarithm alternating current motor, and the reasonable number of pole-pairs that changes motor in time, can make electric automobile keep suitable dynamic characteristics at low speed in a bigger velocity interval at a high speed.
Claims (4)
1. an electric automobile pole-changing logarithm AC motor system is characterized in that described system comprises: motor, pole changing switch, change poles controller, velocity transducer, power supply unit; Power supply unit is made up of DC power supply and frequency converter, and DC power supply provides the frequency-changing AC electricity to be the power supply of pole-changing logarithm alternating current motor by frequency converter; Pole changing switch is used for that pole-changing logarithm alternating current motor is carried out the pole-changing logarithm and switches; Velocity transducer detects the rotating speed of pole-changing logarithm alternating current motor, and tach signal sent to the change poles controller, the change poles controller carries out break-make control according to the rotating speed size to pole changing switch, described pole-changing logarithm alternating current motor is the bipolar logarithm alternating current motor with two numbers of pole-pairs, when the rotating speed of bipolar logarithm alternating current motor surpassed threshold value, the break-make of change poles controller control pole changing switch reduced the work number of pole-pairs of bipolar logarithm alternating current motor; When the rotating speed of bipolar logarithm alternating current motor was lower than threshold value, the break-make of change poles controller control pole changing switch increased the work number of pole-pairs of bipolar logarithm alternating current motor.
2. electric automobile pole-changing logarithm AC motor system according to claim 1 is characterized in that, when the winding of bipolar logarithm alternating current motor is connected into YY shape, adopts three pole changing switches: pole changing switch K1, pole changing switch K2, pole changing switch K3; Bipolar logarithm alternating current motor is made up of the 1st group of winding and the 2nd group of winding; One end of three windings of the 1st group of winding formation that links together, the other end are connected respectively with an end of three windings of the 2nd group of winding and draw tap; The other end of three windings of the 2nd group of winding is an input, is used to connect pole changing switch; Pole changing switch K1 is between frequency converter and bipolar logarithm alternating current motor, and an end links to each other with the input of three windings of the 2nd group of winding, and the other end links to each other with the output of frequency converter; Pole changing switch K2 is between frequency converter and bipolar logarithm alternating current motor, and an end and two groups of windings three tap terminals of contact mutually link to each other, and the other end links to each other with the output of frequency converter; 2nd star of pole changing switch K3 in bipolar logarithm alternating current motor and circuit is between zero point, and an end links to each other with the input of three windings of the 2nd group of winding, and the other end links to each other with the 2nd star zero point; When the rotating speed of bipolar logarithm alternating current motor surpassed threshold value, change poles controller control pole changing switch K1 disconnected, and pole changing switch K2, pole changing switch K3 connect; When the rotating speed of bipolar logarithm alternating current motor was lower than threshold value, change poles controller control pole changing switch K1 connected, and pole changing switch K2, pole changing switch K3 disconnect.
3. electric automobile pole-changing logarithm AC motor system according to claim 1 is characterized in that, when the winding of bipolar logarithm alternating current motor is connected into A shape, adopts two pole changing switches: pole changing switch K4, pole changing switch K5; Bipolar logarithm alternating current motor is made up of the 1st group of winding and the 2nd group of winding; The 1st group of winding has tapped winding by three and forms tap and be used to connect pole changing switch, presses triangle and connects; The 2nd group of winding is made up of three windings, and an end of each winding is connected on the triangular apex of the 1st group of winding that triangle connects, and the other end is an input, is used to connect pole changing switch; Pole changing switch K4 is between power supply unit and bipolar logarithm alternating current motor, and an end links to each other with three inputs of the 2nd group of winding, and the other end links to each other with the output of frequency converter; Pole changing switch K5 is between power supply unit and bipolar logarithm alternating current motor, and an end links to each other with three tap terminals of the 1st group of winding, and the other end links to each other with the output of frequency converter; When the rotating speed of bipolar logarithm alternating current motor surpassed threshold value, change poles controller control pole changing switch K4 disconnected, and pole changing switch K5 connects; When the rotating speed of bipolar logarithm alternating current motor was lower than threshold value, change poles controller control pole changing switch K4 connected, and pole changing switch K5 disconnects.
4. electric automobile pole-changing logarithm AC motor system according to claim 3 is characterized in that the tap of described the 1st group of winding is positioned at 1/2 place of winding.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006100645492A CN101212197B (en) | 2006-12-27 | 2006-12-27 | AC motor system with variable number of pole pairs for electric automobile |
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| CN2006100645492A CN101212197B (en) | 2006-12-27 | 2006-12-27 | AC motor system with variable number of pole pairs for electric automobile |
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| CN101212197A CN101212197A (en) | 2008-07-02 |
| CN101212197B true CN101212197B (en) | 2010-12-08 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103501153B (en) * | 2013-10-21 | 2016-01-20 | 佛山市美传科技有限公司 | The intelligent speed-governing system of three-phase AC asynchronous motor |
| AT14813U1 (en) * | 2014-12-22 | 2016-06-15 | Gerald Hehenberger | Drive train and method for operating a drive train |
| CN106549621B (en) * | 2017-01-13 | 2024-01-26 | 深圳市云林电气技术有限公司 | Control system and control method of induction motor with electronic pole changing function |
| CN107654639A (en) * | 2017-10-25 | 2018-02-02 | 西安交通大学 | The shifting system that pole-changing motor used for electric vehicle is integrated with secondary gear reducer |
| CN108454392A (en) * | 2018-04-12 | 2018-08-28 | 青岛千钧投资企业（有限合伙） | Electric vehicle motor transmission system |
| CN112511072A (en) * | 2020-11-17 | 2021-03-16 | 深圳市云林电气技术有限公司 | Electronic motor and electrical equipment |
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| CN1044740A (en) * | 1989-11-30 | 1990-08-15 | 湘潭机电专科学校 | Three fast Pole-changing using phase-mixing winding connection method and variable-pole winding |
| CN2245824Y (en) * | 1995-08-16 | 1997-01-22 | 广东工业大学 | Single-winding double-speed motor without power dump when pole-changing control |
| CN2432722Y (en) * | 2000-07-20 | 2001-05-30 | 张海鹰 | Three-phase pole-changing compress |
| CN1701502A (en) * | 2001-01-26 | 2005-11-23 | 松下电器产业株式会社 | Inverter apparatus |
| CN1789033A (en) * | 2005-09-08 | 2006-06-21 | 武汉理工大学 | DSP-based flush type electric automobile frequency conversion control method and device |
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2006
- 2006-12-27 CN CN2006100645492A patent/CN101212197B/en active Active
Patent Citations (5)
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|---|---|---|---|---|
| CN1044740A (en) * | 1989-11-30 | 1990-08-15 | 湘潭机电专科学校 | Three fast Pole-changing using phase-mixing winding connection method and variable-pole winding |
| CN2245824Y (en) * | 1995-08-16 | 1997-01-22 | 广东工业大学 | Single-winding double-speed motor without power dump when pole-changing control |
| CN2432722Y (en) * | 2000-07-20 | 2001-05-30 | 张海鹰 | Three-phase pole-changing compress |
| CN1701502A (en) * | 2001-01-26 | 2005-11-23 | 松下电器产业株式会社 | Inverter apparatus |
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Non-Patent Citations (1)
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| JP特开平9-294391A 1997.11.11 |
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Effective date of registration: 20160920 Address after: 516600 New River Industrial Park, Luhe County, Shanwei City, Guangdong Province Patentee after: Shanwei Byd Automobile Company Limited Address before: Kwai Chung town Yanan Road, BYD Industrial Park in Longgang District of Shenzhen City, Guangdong province 518119 Patentee before: Biyadi Co., Ltd. |