Radial flux hybrid stepping motor

Abstract

The invention provides a radial flux hybrid stepping motor. The radial flux hybrid stepping motor comprises a stator portion, a rotor portion, a housing, a front end cover and a rear end cover. The stator portion comprises a stator core, stator windings, a stator inner static core, a permanent magnet and a magnetic modulation ring. The rotor portion is a rotating core and small teeth are uniformly distributed on the outer periphery of the rotating core. The stator core is mounted on the inner periphery of the housing, magnetic poles are distributed on the inner periphery of the stator core, the stator winding is arranged on a pole body of every magnetic pole, and small teeth in the same pitch with that of the teeth on the rotating core are evenly distributed on pole shoes of the magnetic poles. The rotating core rotates between the stator core and the stator inner static core. One end of the stator inner static core is connected to the front end cover. The permanent magnet is mounted on the stator inner static core. The magnetic modulation ring is mounted outside the permanent magnet. The permanent magnet radially magnetizes or parallelly magnetizes. The radial flux hybrid stepping motor is reasonable in structure, low in machining difficulty, high in permanent magnet utilization rate, capable of being analyzed and optimized through two-dimensional finite element software, small in rotor rotational inertia and high in motor operation efficiency.

Description

technical field [0001] The invention relates to a stepping motor, in particular to a hybrid stepping motor. Background technique [0002] At present, stepper motors are divided into reluctance stepper motors, permanent magnet stepper motors and hybrid stepper motors. Among them, although the reluctance stepping motor has high precision and low manufacturing cost, it consumes a lot of power, and the output torque and power are small; although the permanent magnet stepping motor consumes a small amount of power, its step angle is relatively large and its operating accuracy is relatively large. Low. In contrast, the hybrid stepper motor combines the advantages of the reluctance stepper motor and the permanent magnet stepper motor: low power consumption, large output torque, high control accuracy, and can provide a certain self-positioning torque. [0003] However, the traditional hybrid stepping motor still has certain defects in structure: [0004] 1. Since the rotor cores ...

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Problems solved by technology

[0004] 1. Since the rotor cores are segmented, half the rotor tooth pitch is staggered from each other, and the ring-shaped permanent magnet steel is placed in the middle of the rotor cores at both ends, so the structure is complex and the processing is difficult

[0005] 2. The permanent magnet is magnetized along the axial direction, and the stator core is made of laminated silicon steel sheets. There is a non-magnetic insulating layer between the silicon steel sheets, which reduces the axial magnetic permeability of the stator and rotor cores, thereby reducing permanent magnet utilization

[0006] 3. There is no effective electromechanical energy conversion in the axial range of the permanent magnet, thereby reducing the torque density and power density of the motor, and also increasing the resistance and inductance of the stator winding, increasing the power consumption of the motor

[0007] 4. The axial distribution of air gap magnetic density is not uniform, and the magnetic density near both ends decreases, and the effective utilization rate of motor materials is low

[0008] 5. The magnetic density distribution in the motor is complicated, and there are radial and axial magnetic circuits. The motor can only be analyzed by three-dimensional finite element software, which increases the difficulty of analysis and the calculation cycle. For some motors with small tooth sizes , the 3D finite element software cannot even dissect it, which makes the design and analysis of this type of motor very difficult

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