A small centrifugal pump driven by a permanent magnet synchronous motor
A permanent magnet synchronous and electric motor technology, applied in the direction of synchronous machine, starting device, machine/engine, etc., can solve the problems of low efficiency and low cost, and achieve the effect of reducing complexity, stable product performance and reducing requirements
Active Publication Date: 2016-10-19
HANYU GRP CO LTD
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Problems solved by technology
In view of the fact that the traditional small centrifugal pump is driven by an asynchronous motor and the efficiency is low, the existing technology proposes to directly drive it by a permanent magnet synchronous motor, which saves energy and has a small volume, and has better starting and running performance in the predetermined direction of rotation. , the cost is low, but the motor needs to set a separate rotor position detection element
Method used
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Embodiment Construction
[0036] The basic mechanical structure of the centrifugal pump in the embodiment of the present invention is as follows: Image 6 shown, including:
[0037] - motor 2 fixed to the casing;
[0038] - Centrifugal impeller 1 directly connected to the output shaft of the motor that rotates counterclockwise, which has 4 blades; the number of blades can also be 3, 5 or 6, but preferably no more than 8, and an odd number as far as possible , to reduce vibration noise. The impeller is injection molded with a diameter of 100mm. The impeller should not be larger, and the moment of inertia should be as small as possible to match the starting torque of the motor 2, which is still not too large;
[0039] - The motor 2 is an inner rotor motor, including a stator 100 and a permanent magnet rotor 200 .
[0040] The basic electromagnetic structure of the motor of the centrifugal pump in the embodiment of the present invention is as follows: figure 2 shown, including:
[0041] ——The rotor...
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A small-sized centrifugal pump driven by a permanent-magnet synchronous motor comprises an impeller rotating in the preset direction. The motor comprises a stator and a permanent-magnet rotor. The air gap between the stator and the rotor is narrowed in the set circumferential direction of each grade of lower edge. A stator winding rotates in a specific direction and is connected to an alternating-current power source through a switch. A control circuit comprises a detection circuit and a built-in program. The built-in program includes the start control steps for driving the switch to control current of an alternating-current power source input winding according to a detected signal, i.e., (a), the switch is switched on to enable one half-wave voltage of the alternating-current power source to be applied to the winding by a specific conductive angle, and current generated by the winding accordingly is detected, and (b), if the current meets the standard, the switch is immediately switched on continuously by the period of the alternating-current power source and the specific conductive angle, then the motor achieves synchronous operation, or, the step (a) is conducted repeatedly after a period of time enough for the rotor to stop reliably. By means of the design, complexity of the control program is lowered, requirements for elements and circuits are lowered, cost is reduced, and product performance is more stable.
Description
technical field [0001] The invention relates to a small centrifugal pump driven by a permanent magnet synchronous motor, in particular to the coordination of its mechanical structure, electromagnetic structure and control method; in the international patent classification table, the classification belongs to F04D25 / 06 or F04D27 / 00. Background technique [0002] Small centrifugal pumps are widely used and have a long running time, so there is an urgent need for low-cost manufacturing and energy-saving operation. In view of the fact that the traditional small centrifugal pump is driven by an asynchronous motor and the efficiency is low, the prior art proposes to directly drive it by a permanent magnet synchronous motor, which saves energy and has a smaller volume, and has better starting and running performance in a predetermined rotation direction. , the cost is lower, but the motor needs to be provided with a separate rotor position detection element. SUMMARY OF THE INVENT...
Claims
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IPC IPC(8): H02P6/22H02P6/18F04D15/00F04D13/06F04D27/00F04D25/06H02K21/46
Inventor 区长钊
Owner HANYU GRP CO LTD