CN201290056Y

CN201290056Y - Dual voltage permanent-magnet brushless DC motor

Info

Publication number: CN201290056Y
Application number: CNU2008200297785U
Authority: CN
Inventors: 刘大椿; 胡岩长; 殷志华; 杨操; 刘洪�
Original assignee: XI'AN UNITE MOTOR CONTROL TECHNOLOGY Co Ltd
Current assignee: Zhejiang Unite Motor Co.,Ltd.
Priority date: 2008-07-29
Filing date: 2008-07-29
Publication date: 2009-08-12
Anticipated expiration: 2018-07-29

Abstract

The utility model relates to a voltage doubling permanent magnet brushless direct current motor for an electric vehicle requiring a peak value overload torque. The windings of a conventional permanent magnet brushless direct current motor usually adopt three-phase Y connection, the middle points of the three-phase windings need to be connected together inside the housing of a motor, resulting in increased end length of the motor, enlarged size of the motor body and complex process. The permanent magnet rotor of the utility model adopts p pairs of permanent magnet rotors with alternated N and S poles; the stator iron core adopts a laminated iron core with 6p or 12p grooves; a coil is embedded into the stator groove, the three-phase windings lead out 6 connecting terminals out of the housing of the motor and are connected to 3 full-bridge inverter circuits, respectively, and signal codes of position sensors U, V and W and a controller of the motor control the conduction and the disconnection of three full-bridge power devices. The direct current motor provided in the utility model has unique structure and reduced process complexity, without reducing the comprehensive performance indexes of the system.

Description

The multiplication of voltage brushless, permanently excited direct current motor

Technical field

The utility model belongs to the electric motors of torque closed-loop control, relates to the multiplication of voltage brushless, permanently excited direct current motor that electric automobile etc. needs the peak value overload torque.

Background technology

When brushless, permanently excited direct current motor is used as traction motor, for dealing with peak value torque operating mode, normally vehicle is under ramp form or heavily loaded situation, travel with up gradient for adapting to 20%, power drive system will provide the peak torque of 2.5～4 times of nominal torques, the electric current that flows through motor this moment also is 2.5～4 times of rated current, the electric current that flows through of power device in the motor controller is also very big in this case, surpassed the lowest high-current value that can provide in should all specifications of series power device at the output current that needs motor controller to provide in order to reach required peak torque sometimes, though or be to have, cost is also than higher on the cost.In light of this situation, normally adopt the mode of power device multi-channel parallel, so that big electric current output to be provided.But, owing to be subjected to the influence of factor such as symmetry fully of temperature, device performance parameter discrete, drive condition, each parallel branch of power device in parallel is difficult to accomplish the fully uniform-flow operation, relative other branch road of this electric current that just causes some parallel branch to be passed through wants big, it is more serious to generate heat, may cause it to damage at first, its damage causes the burden of other power device again, even surpass the limit capacity of device itself, chain-react, make whole brachium pontis damage and cause thrashing, reduced the reliability of system.Pay particular attention to during especially for IGBT power device in parallel.

Conventional permanent magnet brushless DC motor winding adopts three-phase Y connection usually, need in motor casing three phase winding mid points be received together, has so increased the motor tip lengths, makes the motor body size become big, in addition also more complicated on technology.

The utility model content

There is shortcoming in brushless, permanently excited direct current motor power device parallel connection when requiring peak value torque output, and the utility model provides a kind of structure uniqueness, and the manufacturing process complexity is low, and does not reduce the multiplication of voltage brushless, permanently excited direct current motor of overall system performance index.

In order to achieve the above object, the technical solution adopted in the utility model is:

The multiplication of voltage brushless, permanently excited direct current motor comprises casing, end cap, axle, bearing, cooling system, p-m rotor, and stator core, its special character is: described p-m rotor is the p p-m rotor extremely alternate to N, S; Described stator core is the laminated stator iron core that has 6kp groove; Embed coil in the described stator slot, three phase windings 1 are drawn external 6 binding posts of motor case, and three-phase is respectively A-X, B-Y, C-Z; A-X, B-Y, C-Z motor three phase windings are connected to respectively on 3 full bridge inverters, according to U, the V of position transducer, the signal encoding of W, and conducting, the shutoff of three full bridge power devices of motor controller control.

Above-mentioned p-m rotor is the p p-m rotor extremely alternate to N, S, and stator core slot is counted Z=6kp, k=1 or 2 wherein, and three-phase is respectively A-X, B-Y, C-Z and joins with full bridge inverter respectively.

The utility model is as follows with respect to the advantage of prior art:

Need application scenario in parallel at power device, utilize the multiplication of voltage permanent magnet brushless electromotor, the parallel branch number can be reduced one times, thereby when making power device in parallel, reduce greatly because the discrete current unevenness that causes of device and circuit parameter weighs.

Description of drawings:

Fig. 1 is the structured flowchart of existing brushless, permanently excited direct current motor;

Fig. 2 is multiplication of voltage brushless, permanently excited direct current motor winding and controller architecture block diagram.

Label declaration:

The 1-rotor-position sensor, 2-permanent-magnet brushless DC electric machine, 3-current sensor, 4-contactor, 5-inverter, 6-driver, 7-controller, 8-feedback current processor 1,9-feedback current processor 2.

Embodiment

Motor body of the present utility model also has the p p-m rotor extremely alternate to N, S except that structural members such as casing, end cap, axle, bearing, cooling system; Dash the laminated stator iron core that 6p or 12p groove are arranged; In stator slot, embed coil, three phase winding initial point and terminal points, it is external to draw motor case, and three-phase is labeled as A-X, B-Y, C-Z respectively.

Referring to Fig. 1, Fig. 1 is the structured flowchart of existing brushless, permanently excited direct current motor; Three phase windings 1 of brushless, permanently excited direct current motor are respectively: A-X is the A phase winding, and B-Y is the B phase winding, and C-Z is the C phase winding, and X, Y, Z are connected to same point in the conventional permanent magnet brushless DC motor, is the mid point of three-phase Y connection,

Referring to Fig. 2, Fig. 2 is multiplication of voltage brushless, permanently excited direct current motor winding and controller architecture block diagram; X, Y, Z are not connected to same point in utility model, but independently draw motor body, equally with A, B, C end draw with terminal, and the multiplication of voltage brushless, permanently excited direct current motor will have 6 cable tails like this.In Fig. 1, utility model has 3 full bridge rectifiers, A-X, B-Y, C-Z motor three phase windings are connected to 3 full bridge inverters 4 respectively, 5, on 6, according to U, the V of position transducer 3, the signal of W, conducting, the shutoff of three full bridge power devices of motor controller control, thereby control flows is crossed the sense of current in the motor winding, in the motor winding, produce great-jump-forward magnetic field, the motor rotor 2 that is embedded with permanent magnetism magnetic pole is rotated continuously, and table 1 is the relation of position transducer U, V, W signal and power device conducting:

Annotate: UVW signal " 1 " is illustrated in N extremely down, and " 0 " is illustrated in S extremely down; Brachium pontis in "+" expression, "-" expression is brachium pontis down

We are " 101 " at the UVW signal for example as can be seen from table 1, and when turning to " CCW ", the current path that flows through the motor winding is: P → A+ → X-→ N, and P → Y+ → B-→ N is equivalent to electric current and flows into the A phase winding, flows out the B phase winding; Conventional permanent magnet brushless motor (as Fig. 1) electric current is: P → A → O → B → N; From above we can see, it on the power device is motor winding opposite potential that the multiplication of voltage brushless, permanently excited direct current motor is added in, and the conventional permanent magnet brushless DC motor to be added on the power device be motor winding wire back-emf, the former voltage is half of the latter, therefore the back emf coefficient of motor can be doubled, be equivalent to supply voltage and be doubled.Need application scenario in parallel at power device like this, utilize the words of multiplication of voltage permanent magnet brushless electromotor, the parallel branch number can be reduced one times, thereby make in the power device process in parallel, the current unevenness weighing apparatus that causes owing to dispersing of device and circuit parameter reduces greatly.

Claims

1, multiplication of voltage brushless, permanently excited direct current motor comprises casing, end cap, axle, bearing, cooling system, p-m rotor, and stator core is characterized in that: described p-m rotor is the p p-m rotor extremely alternate to N, S (2); Described stator core is the laminated stator iron core that has 6kp groove; Embed coil in the described stator slot, three phase windings (1) are drawn external 6 binding posts of motor case, and three-phase is respectively A-X, B-Y, C-Z; A-X, B-Y, C-Z motor three phase windings are connected to respectively on 3 full bridge inverters (4,5,6), according to U, the V of position transducer (3), the signal encoding of W, and conducting, the shutoff of three full bridge power devices of motor controller control.

2, multiplication of voltage brushless, permanently excited direct current motor according to claim 1, it is characterized in that: described p-m rotor is the p p-m rotor extremely alternate to N, S (2), stator core slot is counted Z=6kp, k=1 or 2 wherein, three-phase is respectively A-X, B-Y, C-Z and joins with full bridge inverter respectively.