Permanent magnet synchronous motor of sine pole width modulation
A permanent magnet synchronous motor technology, applied in the field of motors, can solve the problems of efficiency drop, temperature rise, speed oscillation, etc., and achieve the effects of improving stability and reliability, high efficiency and high power factor
Inactive Publication Date: 2009-04-29
XUZHOU CURRENCY MAGNETOELECTRICITY
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[0002] A permanent magnet synchronous motor has the characteristics of light weight, high performance, high efficiency and energy saving, and has a wide market space, but the number of permanent magnet synchronous motors in actual operation accounts for a small proportion
The existing permanent magnet rotor, especially the air gap magnetic field established by the veneer structure, is a non-sinusoidal wave, and there are a lot of harmonics in it, which increases the copper loss, iron loss and miscellaneous loss of the motor, decreases the efficiency, and increases the temperature rise. The energy-saving advantages of synchronous motors cannot be reflected; in addition, pulse vibration electromagnetic torque will be generated to cause speed oscillation, which will affect the stability and reliability of operation, and directly limit the use and promotion
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[0015] A permanent magnet synchronous motor with sinusoidal pole width modulation, including a shaft 1, a bearing 2 matched with the shaft 1, an end cover 3, a stator core 5, and a rotor core 6 matched with the shaft 1; it is characterized in that : fixedly equipped with n distributed permanent magnet poles 7 in the circumferential direction of the rotor core 6; the width of the distributed permanent magnet poles 7 is not equal, and the interval width is not equal; the i-th distributed permanent magnet pole centerline distance Large pole centerline θ i =(2i-1)π / (2n)electrical angle; the width arc angle of the i-th distributed magnetic pole is α i =cos[-1)π / n]-cos(iπ / n) electrical angle. A rotor squirrel cage 8 is arranged outside the rotor iron core 6; the rotor squirrel cage 8 performs circumferential separation and circumferential positioning on the distributed permanent magnetic poles 7. The width of the distributed permanent magnet poles 7 is determined by the equivalent...
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The invention relates to a permanent magnet synchronous motor of sinusoidal pole width modulation, belonging to the technical field of motors. The motor comprises a rotation shaft (1), a bearing (2) which is matched with the rotation shaft (1), an end cover (3), a stator core (5) and a rotor core (6) which is matched with the rotation shaft (1); the motor is characterized in that n distribution-typed permanent magnetic pole (7), with unequal widths and intermittent spacings, are fixed at the circumference of the rotor core (6); the central line of the distribution-typed permanent magnet of No. i (i is equal to 1, 2, 3,..., n) and the central line of a magnetic pole have an electric angle of Theta which is equal to (2i-1)*pi/(2n); the width arc angle Alpha of the distribution-typed magnetic pole of No. i is equal to cos((i-1)*pi/n-cos(i*pi/n)); a squirrel cage rotor (8) is arranged outside the rotor core (6) and carries out circumference separation and circumferential positioning on the distribution-typed permanent magnetic pole (7). The invention has the advantages of high work efficiency, stable and reliable operation and obvious energy-saving characteristic.
Description
technical field [0001] The invention belongs to the technical field of motors, in particular to a permanent magnet synchronous motor with sinusoidal pole width modulation. Background technique [0002] A permanent magnet synchronous motor has the characteristics of light weight, high performance, high efficiency and energy saving, and has a wide market space, but the number of permanent magnet synchronous motors in actual operation accounts for a small proportion. The existing permanent magnet rotor, especially the air gap magnetic field established by the veneer structure, is a non-sinusoidal wave, and there are a lot of harmonics in it, which increases the copper loss, iron loss and miscellaneous loss of the motor, decreases the efficiency, and increases the temperature rise. The energy-saving advantages of synchronous motors cannot be reflected; in addition, pulsating electromagnetic torques will be generated, which will cause speed oscillations, affect the stability and ...
Claims
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IPC IPC(8): H02K21/12H02K21/02H02K21/46H02K1/27H02K9/06
Inventor 安跃军孙昌志
Owner XUZHOU CURRENCY MAGNETOELECTRICITY
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