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

Patent metadata

Field	Value
Publication number	US-9454638-B2
Application number	US-201113876035-A
Country	US
Kind code	B2
Filing date	Oct 19, 2011
Priority date	Oct 19, 2010
Publication date	Sep 27, 2016
Grant date	Sep 27, 2016

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.

First claim

The invention claimed is:

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.

Assignees

• Fujinaga Takashi
• Mitsuyama Yasushi
• Hashimoto Hideki
• Okada Shinji
• Mitsubishi Heavy Ind Ltd

Inventors

• Fujinaga Takashi
• Mitsuyama Yasushi
• Hashimoto Hideki
• Okada Shinji

Classifications

• Y02T10/72

  Electric energy management in electromobility · CPC title

• B60L2240/421

  Speed · CPC title

• H02K15/00

  Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines · CPC title

• B60L2240/547

  Voltage · CPC title

• B60Y2304/00

  Optimising design; Manufacturing; Testing · CPC title