Motor design method, motor designed by motor design method, and electric vehicle provided with motor

• US 9,454,638 B2
• Filed: 10/19/2011
• Issued: 09/27/2016
• Est. Priority Date: 10/19/2010
• Status: Active Grant

• Current Assignee: Mitsubishi Heavy Industries, Ltd.
• Original Assignee: Mitsubishi Heavy Industries, Ltd.
• Inventors: Fujinaga, Takashi, Mitsuyama, Yasushi, Hashimoto, Hideki, Okada, Shinji
• Primary Examiner(s): Craig, Dwin M
• Application Number:
  US13/876,035
• Publication Number:
  US 20130179133A1
• Time in Patent Office: 1,805 Days
• Field of Search: 703/2
• US Class Current: 1/1
• CPC Class Codes: B60L 15/2045 for optimising the use of energy
• CPC Class Codes: B60L 2200/18 Buses
• CPC Class Codes: B60L 2220/44 Wheel Hub motors, i.e. integrated in the wheel hub
• CPC Class Codes: B60L 2240/12 Speed
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/425 Temperature
• CPC Class Codes: B60L 2240/429 Current
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 3/0061 relating to electrical machines
• CPC Class Codes: B60L 3/12 Recording operating variables ; Monitoring of operating variables
• CPC Class Codes: B60L 50/51 characterised by AC-motors
• CPC Class Codes: B60L 50/66 Arrangements of batteries
• CPC Class Codes: B60L 58/21 having the same nominal voltage
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 2300/10 Buses
• CPC Class Codes: B60Y 2304/00 Optimising design; Manufacturing; Testing
• CPC Class Codes: G06F 30/15 Vehicle, aircraft or watercraft design
• CPC Class Codes: H02K 15/00 Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility

Abstract

A motor design method, a motor (11) designed by the motor design method, and an electric vehicle (10) provided with the motor (11) include a first calculation step of obtaining a set of a number of revolutions required to achieve a predetermined running pattern and a torque required to achieve the predetermined running pattern, a second calculation step of selecting a motor efficiency corresponding to the number of revolutions and the torque from any one of motor characteristic curves, a third calculation step of obtaining a work amount from the number of revolutions and the torque and obtaining power consumption by dividing the work amount by the motor efficiency, and a fourth calculation step of obtaining a sum of the power consumption by repeating the first calculation step, the second calculation step, and the third calculation step over the entire running time.

Claims

1. A motor design method implemented using a computer processing to design a motor dedicated to an electric vehicle, the motor design method comprising:

measuring and analyzing a running pattern of the electric vehicle;

calculating a set of a number of revolutions and a torque according to the running pattern of the electric vehicle;

determining a motor efficiency corresponding to the number of revolutions and the torque with reference to a specification of the motor;

calculating a work amount based on the number of revolutions and the torque;

calculating power consumption by dividing the work amount by the motor efficiency;

producing a sum of the power consumption over an entire running time of the electric vehicle;

setting a motor efficiency map, representing the motor efficiency in connection with the number of revolutions and the torque, with the sum of the power consumption minimized; and

designing the motor with reference to the motor efficiency map.

2. A motor designed by the motor design method according to claim 1.

3. An electric vehicle including a motor adapted to a running pattern which is measured and analyzed in advance, the motor being designed according to a motor design method comprising:

calculating a set of a number of revolutions and a torque according to the running pattern;

determining a motor efficiency corresponding to the number of revolutions and the torque with reference to a specification of the motor;

calculating a work amount based on the number of revolutions and the torque;

calculating power consumption by dividing the work amount by the motor efficiency;

producing a sum of the power consumption over an entire running time of the electric vehicle;

setting a motor efficiency map, representing the motor efficiency in connection with the number of revolutions and the torque, with the sum of the power consumption minimized; and

designing the motor with reference to the motor efficiency map.

4. An electric vehicle comprising:

a battery;

a motor system including a motor and an invertor electrically driven by the battery; and

a controller configured to monitor the battery and the motor system, thus measuring a running pattern,

wherein the motor is designed to operate with reference to a motor efficiency map which is set through;

calculating a set of a number of revolutions and a torque according to the running pattern;

determining a motor efficiency corresponding to the number of revolutions and the torque with reference to a specification of the motor;

calculating a work amount based on the number of revolutions and the torque;

calculating power consumption by dividing the work amount by the motor efficiency;

producing a sum of the power consumption over an entire running time of the electric vehicle; and

setting the motor efficiency map, representing the motor efficiency in connection with the number of revolutions and the torque, with the sum of the power consumption minimized.