An electric drive system

Abstract

The present invention relates to an electric drive system (1) which considers requirements such as continuous and instantaneous power, speed, torque, residential area and realizes the vehicle movement in electric vehicles.

Description

[0001] AN ELECTRIC DRIVE SYSTEM

[0002] Technical Field

[0003] The present invention relates to an electric drive system which considers requirements such as continuous and instantaneous power, speed, torque, residential area and realizes the vehicle movement in electric vehicles.

[0004] Background of the Invention

[0005] An electric drive system (Electric Drive Unit - EDU) is used to provide vehicle movement in electric vehicles. The electric drive system is specially designed according to the battery capacity and the efficiency aimed to be provided, in particular to the vehicle’s performance needs (acceleration, maximum speed, energy consumption and production, etc.). Today, an electric motor, a motor driver and a gear box are included in an electric drive system. The driver enables the machine to operate as a motor or generator (charges the battery) by controlling the phase difference of the current and the voltage passing through the electric machine. Switching speeds, busbar design and control algorithm during motor control are important in terms of the efficiency of the product being designed. The driver can be integrated into different electric vehicles such as electric land vehicles, air vehicles, marine vehicles; and industrial systems compatible with the field of use in such a way that it can provide different speed, torque and power combinations. On the other hand, although the electric vehicles used in the prior art have their own drivers, the use of liquid cooling for cooling is a common application which reduces the package size of the machine considering the limited space where the driver will be installed. Therefore, today there is a need for solutions of electric drive system which do not only meet the continuous and instantaneous power needs of the vehicle, but also meet requirements such as residential area. The Chinese patent document no. CN217917632, an application included in the state of the art, discloses an electric automobile and a control circuit thereof. The control circuit included in the said invention consists of a first switch module and a second switch module, the input end of the first switch module is used for being connected with a vehicle control unit of the electric vehicle and the output end of the first switch module is used for being connected with the input end of a main drive motor of the electric vehicle, the input end of the second switch module is used for being connected with a vehicle control unit of the electric vehicle, and the output end of the second switch module is used for being connected with the input end of an auxiliary drive motor of the electric vehicle. According to the invention, the no-load loss of the electric automobile can be reduced, its energy consumption is reduced, and the cruising ability is improved.

[0006] The Chinese patent document no. CN114801679, an application included in the state of the art, refers to a drive axle device of an electric automobile. The said invention discloses a drive axle device of an electric automobile. In the invention, a first planetary mechanism is matched with a first power input assembly to receive the torque of the first power input assembly, a first output assembly is matched with the first planetary mechanism to output the torque, and an adjusting unit comprises a first gear pair for receiving the torque of the first power input assembly and a second gear pair for receiving the torque of the second power input assembly. In the invention, the first gear pair is connected with the first power input assembly; the auxiliary shaft assembly is in pivot fit with the first gear pair, and the auxiliary shaft assembly is combined with or separated from the first gear pair so as to transmit or cut off the torque of the first gear pair; the gear ring hub is fixed to the first planetary mechanism so that torque from the auxiliary shaft assembly can be loaded to the first output assembly through the first planetary mechanism, and therefore the torque and the rotating speed of the first output assembly can be adjusted. Summary of the Invention

[0007] An objective of the present invention is to realize an electric drive system for considering requirements such as continuous and instantaneous power, speed, torque, residential area in electric vehicles.

[0008] Another objective of the present invention is to realize an electric drive system for using a cooling channel by optimizing it in order that a motor and a drive could be cooled simultaneously.

[0009] Another objective of the present invention is to realize an electric drive system with drive electronics that provide maximum efficiency, minimum vibration and have dimensions and operating conditions specific to the unit where it is used.

[0010] Detailed Description of the Invention

[0011] “An Electric Drive System” realized to fulfil the objectives of the present invention is shown in the figure attached, in which:

[0012] Figure 1 is a perspective view of the inventive electric drive system.

[0013] The components illustrated in the figure are individually numbered, where the numbers refer to the following:

[0014] 1. Electric drive system

[0015] 2. Electric motor

[0016] 3. Motor driver

[0017] 4. Gear box

[0018] The inventive electric drive system (1) for creating continuous and instantaneous power in electric vehicles comprises at least one electric motor (2) which is an interior permanent magnet synchronous machine (IPMSM); at least one motor driver (3) which is configured to enable the control of continuous and instantaneous power delivery for the electric motor; and at least one gear box (4) which is connected to the electric motor (2) and enables the transfer of the generated power to the traction system.

[0019] The electric motor (2) included in the inventive electric drive system (1) is an interior permanent magnet synchronous machine; is controlled by the motor driver (3); and consists of a rotor wherein a magnet is embedded and that provides the movement by rotating around a shaft, and a stator wherein copper windings are included and that has a fixed position. In the electric motor (2), the magnetic field generated by the magnets included in the rotor during movement interacts with the magnetic field generated by the copper windings included in the stator and it is configured to function as a motor in the event that the stator is leading, but to function as a generator in the event that the rotor is leading in mechanical tracking. The electric motor (2) charges the battery in the event that it acts as a generator. In one preferred embodiment of the invention, the most efficient production of torque is ensured in the electric motor (2) by realizing geometric optimization at magnetic flux paths. On the other hand, the optimization of steel area is realized according to the type of round wire winding in the electric motor (2). In addition, geometric and design optimization is realized in order that the rotor of the electric motor (2) can obtain the desired torque by means of the magnet. Besides, the electric motor (2) comprises cooling channel for cooling the electric motor (2) together with the motor driver (3).

[0020] The motor driver (3) included in the inventive electric drive system (1) is configured to control an interior permanent magnet synchronous machine and comprises a two- level inverter and six transistor switches to operate the electric motor (2) at the desired speed and torque. The motor driver (3) is configured to control the electric motor (2) by converting the energy, that is stored in the battery, into AC current by switching. The motor driver (3) is configured to enable the electric motor (2) to operate as a motor or generator, by controlling the phase difference of the current and the voltage passing through the electric motor (2). The motor driver (3) is configured to consider the switching speeds, conduction times of switches, dead time between the switches on the same leg, busbar design, design of DC link capacitor during the control of the electric motor (2).

[0021] The gear box (4) included in the inventive electric drive system (1) comprises two- stage, parallel-axis, helical gears that are driven by the electric motor (2), and an open differential. The gear box (4) comprises a container where two-stage, parallelaxis, helical gears and an open differential are included; and the machine elements are included in it. The gear box (4) comprises an electric motor (2) input and two differential outputs, and has a movable mechanical interface. The gear box (4) is a transmission system and is configured to transmit the power it receives from the electric motor (2) to the wheels by increasing the torque and reducing the speed. In addition, the gear box (4) is connected to the electric motor (2) such that it will have a fixed mounting by means of bolted connection.

[0022] The inventive electric drive system (1) is used to provide continuous and instantaneous power in electric vehicles and on one hand, it is produced at minimum cost, by considering requirements such as cost requirement, residential area, etc. On the other hand, the optimization of the cooling channel it has enables the electric motor (2) and the motor driver (3) to be cooled simultaneously.

[0023] Within these basic concepts; it is possible to develop various embodiments of the inventive “Electric Drive System (1)”; the invention cannot be limited to examples disclosed herein and it is essentially according to claims.

Claims

CLAIMS1. An electric drive system (1) for creating continuous and instantaneous power in electric vehicles; characterized by at least one electric motor (2) which is an interior permanent magnet synchronous machine (IPMSM); at least one motor driver (3) which is configured to enable the control of continuous and instantaneous power delivery for the electric motor; and at least one gear box (4) which is connected to the electric motor (2) and enables the transfer of the generated power to the traction system.

2. An electric drive system (1) according to Claim 1; characterized by the electric motor (2) which is an interior permanent magnet synchronous machine; is controlled by the motor driver (3); and consists of a rotor wherein a magnet is embedded and that provides the movement by rotating around a shaft, and a stator wherein copper windings are included and that has a fixed position.

3. An electric drive system (1) according to Claim 1 or 2; characterized by the electric motor (2) wherein the magnetic field generated by the magnets included in the rotor during movement interacts with the magnetic field generated by the copper windings included in the stator and which is configured to function as a motor in the event that the stator is leading, but to function as a generator in the event that the rotor is leading in mechanical tracking4. An electric drive system (1) according to any of the preceding claims; characterized by the electric motor (2) which charges the battery in the event that it acts as a generator.

5. An electric drive system (1) according to any of the preceding claims; characterized by the electric motor (2) which comprises cooling channel for cooling the electric motor (2) together with the motor driver (3).

6. An electric drive system (1) according to any of the preceding claims; characterized by the motor driver (3) which is configured to control an interior permanent magnet synchronous machine and comprises a two-level inverter and six transistor switches to operate the electric motor (2) at the desired speed and torque.

7. An electric drive system (1) according to any of the preceding claims; characterized by the motor driver (3) which is configured to control the electric motor (2) by converting the energy, that is stored in the battery, into AC current by transistor switching.

8. An electric drive system (1) according to any of the preceding claims; characterized by the motor driver (3) which is configured to enable the electric motor (2) to operate as a motor or generator, by controlling the phase difference of the current and the voltage passing through the electric motor (2).

9. An electric drive system (1) according to any of the preceding claims; characterized by the gear box (4) which comprises two-stage, parallel-axis, helical gears that are driven by the electric motor (2), and an open differential.

10. An electric drive system (1) according to Claim 9; characterized by the gear box (4) which comprises a container where two- stage, parallel-axis, helical gears and an open differential are included; and wherein the machine elements are included.

11. An electric drive system (1) according to any of the preceding claims; characterized by the gear box (4) which comprises an electric motor (2) input and two differential outputs, and has a movable mechanical interface.

12. An electric drive system (1) according to any of the preceding claims; characterized by the gear box (4) which is a transmission system and is configuredto transmit the power it receives from the electric motor (2) to the wheels by increasing the torque and reducing the speed.

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