An AC-D axis inductance variable permanent magnet brushless motor and its wide-area high-efficiency optimal design method

Abstract

The invention discloses an AC-D axis inductance variable permanent magnet brushless motor and a wide-area high-efficiency optimization design method thereof. 2. When the car is in different working conditions, the motor can meet the requirements of torque, speed regulation range and wide-area efficiency under the corresponding working conditions through the change of the ratio of the AC-D axis inductance; step 3, set the AC-D axis inductance to be variable Type permanent magnet brushless motor; step 4, conduct preliminary optimization on the size of the rotor magnetic barrier and arc permanent magnet, and give the initial size and constraint conditions; step 5, according to the requirements of different working conditions The dimensions of the magnetic barrier and the arc-shaped permanent magnet are comprehensively optimized. The invention enables the motor to obtain higher comprehensive efficiency than the traditional permanent magnet brushless motor under the condition of simple structure, and guarantees the multi-objective requirements under different working conditions such as higher torque density under the condition of light load.

Description

technical field

[0001] The invention belongs to the technical field of permanent magnet brushless motors, and relates to an alternating-direction axis inductance variable permanent magnet brushless motor and a wide-area high-efficiency optimization design method thereof. Background technique

[0002] In recent years, electric vehicles have become one of the main directions for the development of new energy vehicles due to their significant advantages such as high efficiency and zero emissions. Similar to traditional cars, electric vehicles also need to meet various driving environments such as "urban roads, expressways, and rural roads". operating conditions. This complex driving environment and variable operating conditions put forward more stringent performance requirements for the motor and its drive system.

[0003] At present, permanent magnet brushless motors have been widely used in electric vehicle electric drive systems due to their advantages of high power densit...

Examples

Embodiment Construction

[0040] Step 1, obtain the ratio of AC-D axis inductance through the magnetic circuit diagram of the multi-working condition permanent magnet motor;

[0041] see figure 1 , the simplified d-axis and q-axis equivalent flux paths of conventional permanent magnet motors and permanent magnet motors introducing variable reluctance are given, where the d-axis and q-axis flux paths are shown at different rotor positions. according to figure 1 (b), AC-D axis inductance L d , L q and leakage flux Ф σ (i d , i q ) can be expressed as follows:

[0042]

[0043] Where: N is the number of turns of the winding, R br (i d , i q ) is the introduced variable reluctance, R pm is the permanent magnet reluctance, R r is the rotor reluctance, R s is the stator reluctance, R g is the air gap reluctance; i d , i q Respectively d, q axis armature current;

[0044] Then L q / L d It can be expressed as:

[0045]

[0046] Step 2, when the car is in different working conditions, a...

technical field

[0001] The invention belongs to the technical field of permanent magnet brushless motors, and relates to an alternating-direction axis inductance variable permanent magnet brushless motor and a wide-area high-efficiency optimization design method thereof. Background technique

[0002] In recent years, electric vehicles have become one of the main directions for the development of new energy vehicles due to their significant advantages such as high efficiency and zero emissions. Similar to traditional cars, electric vehicles also need to meet various driving environments such as "urban roads, expressways, and rural roads". operating conditions. This complex driving environment and variable operating conditions put forward more stringent performance requirements for the motor and its drive system.

[0003] At present, permanent magnet brushless motors have been widely used in electric vehicle electric drive systems due to their advantages of high power densit...

Examples

Embodiment Construction

[0040] Step 1, obtain the ratio of AC-D axis inductance through the magnetic circuit diagram of the multi-working condition permanent magnet motor;

[0041] see figure 1 , the simplified d-axis and q-axis equivalent flux paths of conventional permanent magnet motors and permanent magnet motors introducing variable reluctance are given, where the d-axis and q-axis flux paths are shown at different rotor positions. according to figure 1 (b), AC-D axis inductance L d , L q and leakage flux Ф σ (i d , i q ) can be expressed as follows:

[0042]

[0043] Where: N is the number of turns of the winding, R br (i d , i q ) is the introduced variable reluctance, R pm is the permanent magnet reluctance, R r is the rotor reluctance, R s is the stator reluctance, R g is the air gap reluctance; i d , i q Respectively d, q axis armature current;

[0044] Then L q / L d It can be expressed as:

[0045]

[0046] Step 2, when the car is in different working conditions, a...

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