Poly-phase alternating-current linear motor system for ring windings

Abstract

The invention provides a poly-phase alternating-current linear motor system for ring windings and belongs to the field of motors. The problems that due to the fact that traditional integer groove single-layer windings are adopted in a three-phase linear permanent magnet synchronous motor, the structure is complex, cost is high, the magnetomotive force and electromotive force harmonic components are large, thrust of the motor is large in ripple, efficiency is low, the lateral bracing span of a rotor is large, and the rotor is large in bracing difficulty are solved. The poly-phase alternating-current linear motor system for the ring windings comprises an m-phase alternating-current linear motor and m / 3 three-phase power converters, wherein m=3k; the m-phase alternating-current linear motor comprises a primary level and a secondary level; the primary level comprises a primary iron core and m / 3 primary ring windings and each primary ring winding is a three-phase ring winding; the electrical angle phase difference between corresponding phases of every two adjacent primary ring windings is delta and delta is + / - 180 degrees per meter. Three outgoing lines of each primary ring winding are correspondingly connected with alternating-current output ends of one three-phase power converter; a direct-current bus is shared by the m / 3 three-phase power converters.

Description

Technical field

[0001] The invention relates to a toroidal winding multi-phase AC linear motor system and belongs to the field of motors. Background technique

[0002] Multi-phase linear motors use more than three-phase primary winding structure. For AC linear motors powered by inverters, the number of primary winding phases can be regarded as a new free parameter. Compared with ordinary three-phase motors, its main advantages are: reducing the working current of the phase windings, thereby reducing the capacity of the switching devices, which is an effective means of using low-voltage standard power devices to achieve high-voltage and high-power levels; improving the magnetomotive force waveform It eliminates the 5th, 7th and other low-order harmonic magnetic fields in the motor and the thrust fluctuation caused by the harmonic magnetic field, reduces the vibration and noise of the motor, improves the stability of the system and the dynamic and static characteristics of the syst...

Examples

specific Embodiment approach 1

[0025] Specific implementation mode 1: the following combination figure 1 To explain this embodiment, the toroidal winding multi-phase AC linear motor system of this embodiment includes m-phase AC linear motor and m / 3 three-phase power converters; m=3k, and k is a positive integer greater than 1;

[0026] The m-phase AC linear motor includes a primary 1 and a secondary 2;

[0027] The primary 1 includes a primary core 1-1 and m / 3 sets of primary toroidal windings 1-2. The primary toroidal windings 1-2 are three-phase toroidal windings; every two adjacent primary toroidal windings 1-2 correspond to phases between The electrical angle phase difference is δ, and meets the condition δ=±180° / m; the three lead wires of each set of primary toroidal winding 1-2 are connected to the three AC output terminals of a three-phase power converter in a one-to-one correspondence;

[0028] m / 3 three-phase power converters share the DC bus, and the electrical angle phase difference of the correspondin...

specific Embodiment approach 2

[0031] Specific implementation manner 2: the following combination Image 6 To describe this embodiment, the toroidal winding multi-phase AC linear motor system of this embodiment includes an m-phase AC linear motor and an m-phase power converter; m is a positive integer greater than or equal to 5;

[0032] The m-phase AC linear motor includes a primary 1 and a secondary 2;

[0033] The primary 1 includes a primary core 1-1 and a primary toroidal winding 1-2. The primary toroidal winding 1-2 is an m-phase toroidal winding; the electrical angle phase difference between each two adjacent phases of the primary toroidal winding 1-2 is δ , And satisfy the condition δ=±360° / m; the lead wire of each phase of the primary toroidal winding 1-2 is connected to an AC output terminal of the m-phase power converter;

[0034] The m-phase power converter outputs m-phase current, and the electrical angle phase difference between each adjacent two-phase current is δ.

[0035] To Image 6 Given m=5 as a...

specific Embodiment approach 3

[0036] Specific implementation manner three: the following combination figure 2 , image 3 with Figure 7 To explain this embodiment, this embodiment will further explain the first or second embodiment, the secondary 2 is a bilateral structure, and there is an air gap between the primary 1 and the secondary 2;

[0037] The cross section of the primary core 1-1 is rectangular, and the left and right air gap sides of the primary core 1-1 are slotted symmetrically along the direction of movement, and the slots are evenly distributed along the direction of movement; the primary toroidal winding 1-2 is The toroidal winding, the coil constituting the primary toroidal winding 1-2 is rectangular, and a coil is embedded in two slots corresponding to the left and right positions of the primary core 1-1.

[0038] The two effective sides of each coil are embedded in the two corresponding, symmetrical slots on the left and right of the primary core 1-1. Only one coil side is embedded in each sl...

Technical field

[0001] The invention relates to a toroidal winding multi-phase AC linear motor system and belongs to the field of motors. Background technique

[0002] Multi-phase linear motors use more than three-phase primary winding structure. For AC linear motors powered by inverters, the number of primary winding phases can be regarded as a new free parameter. Compared with ordinary three-phase motors, its main advantages are: reducing the working current of the phase windings, thereby reducing the capacity of the switching devices, which is an effective means of using low-voltage standard power devices to achieve high-voltage and high-power levels; improving the magnetomotive force waveform It eliminates the 5th, 7th and other low-order harmonic magnetic fields in the motor and the thrust fluctuation caused by the harmonic magnetic field, reduces the vibration and noise of the motor, improves the stability of the system and the dynamic and static characteristics of the syst...

Examples

specific Embodiment approach 1

[0025] Specific implementation mode 1: the following combination figure 1 To explain this embodiment, the toroidal winding multi-phase AC linear motor system of this embodiment includes m-phase AC linear motor and m / 3 three-phase power converters; m=3k, and k is a positive integer greater than 1;

[0026] The m-phase AC linear motor includes a primary 1 and a secondary 2;

[0027] The primary 1 includes a primary core 1-1 and m / 3 sets of primary toroidal windings 1-2. The primary toroidal windings 1-2 are three-phase toroidal windings; every two adjacent primary toroidal windings 1-2 correspond to phases between The electrical angle phase difference is δ, and meets the condition δ=±180° / m; the three lead wires of each set of primary toroidal winding 1-2 are connected to the three AC output terminals of a three-phase power converter in a one-to-one correspondence;

[0028] m / 3 three-phase power converters share the DC bus, and the electrical angle phase difference of the correspondin...

specific Embodiment approach 2

[0031] Specific implementation manner 2: the following combination Image 6 To describe this embodiment, the toroidal winding multi-phase AC linear motor system of this embodiment includes an m-phase AC linear motor and an m-phase power converter; m is a positive integer greater than or equal to 5;

[0032] The m-phase AC linear motor includes a primary 1 and a secondary 2;

[0033] The primary 1 includes a primary core 1-1 and a primary toroidal winding 1-2. The primary toroidal winding 1-2 is an m-phase toroidal winding; the electrical angle phase difference between each two adjacent phases of the primary toroidal winding 1-2 is δ , And satisfy the condition δ=±360° / m; the lead wire of each phase of the primary toroidal winding 1-2 is connected to an AC output terminal of the m-phase power converter;

[0034] The m-phase power converter outputs m-phase current, and the electrical angle phase difference between each adjacent two-phase current is δ.

[0035] To Image 6 Given m=5 as a...

specific Embodiment approach 3

[0036] Specific implementation manner three: the following combination figure 2 , image 3 with Figure 7 To explain this embodiment, this embodiment will further explain the first or second embodiment, the secondary 2 is a bilateral structure, and there is an air gap between the primary 1 and the secondary 2;

[0037] The cross section of the primary core 1-1 is rectangular, and the left and right air gap sides of the primary core 1-1 are slotted symmetrically along the direction of movement, and the slots are evenly distributed along the direction of movement; the primary toroidal winding 1-2 is The toroidal winding, the coil constituting the primary toroidal winding 1-2 is rectangular, and a coil is embedded in two slots corresponding to the left and right positions of the primary core 1-1.

[0038] The two effective sides of each coil are embedded in the two corresponding, symmetrical slots on the left and right of the primary core 1-1. Only one coil side is embedded in each sl...

Images