1, do not design too slim or flat motor

Motor design and strive to get the best performance with a minimum of materials and costs. In general, flat motor with less iron, copper more, more structural materials. Elongated motor with iron more with less copper, less structural material, but poor stiffness of the structure.

    Therefore, the diameter and length of the ratio of the motor there is an optimum value. The inner circle and the length of the core ratio of about 1:1. The design motor to optimize the design according to the motor performance requirements and market effective materials, structural materials prices, in addition to considering the series, common parts as well as the structure of the process, tool and die cost.

    2, the motor coil current density should not be too big or too small

    The motor coil has a certain resistance, the loss generated when the current through the coil, so that the motor efficiency is reduced, the winding temperature rise. Want to reduce the resistance in order to reduce the loss, reduce the temperature rise, improve efficiency motor design. To reduce the current density, increase the wire cross-sectional area can reduce the resistance, but will lead to increased use of coil material. Due to the increase of the groove area, causing the core flux density increases, the motor excitation current and iron loss increases. Therefore, the choice of the current density to take full account of motor performance. The current density is generally used to 7A/mm2. Take a small value for large motor and closed motor. Whichever is greater for small motor and open motor.

    3, the motor core flux density should not be too high or too low

    When the core material, frequency and silicon steel sheet thickness is constant. The iron loss depends on the size of the magnetic flux density. The magnetic flux density is too high. To increase the iron loss. Reduce the efficiency of the motor. Core fever increased motor temperature rise. And due to the increase in excitation ampere-turns. Motor power factor reduction. Therefore, the magnetic flux density of the core is not too high, try to avoid using over-saturation of the magnetization curve segment. Small motors generally not more than 155T. Magnetic flux density is too low, the motor material consumption increased costs.

    4, the design of the motor geometry possible use of parallel teeth trapezoidal groove

    The silicon steel work in the saturation magnetization curve segment, the unit length of the excitation ampere-turns consumed with the increase of the magnetic flux density and a substantial increase. In order to rationally make full use of the space inside the motor, motor design is always the silicon steel is saturated. If trapezoidal tooth, tooth narrow portion due to the magnetic flux density is large, a large number of excitation ampere-turns increases, the motor power factor reduction. If the parallel teeth. Along a uniform magnetic flux density in the tooth length of the ampere-turns of the excitation consumption is greatly reduced.

    5, the edge of the trough has no sharp edges

 The trough should be designed to facilitate the manufacture of die. Die quenching. The grooves sharp corners often due to stress concentration and cracks. Rounded corners also helps extend die life. Slotted design their edges should be rounded corner radius shall be not less than 1 mm.

    6, try to use round-bottomed groove instead of the flat-bottomed groove

    Round-bottomed groove advantages: round-bottomed grooves can improve the filling of the wire. Slot insulation is not damaged, in the case of the same slot fill factor, round-bottomed groove embedded line easier than the flat-bottomed groove. The rotor cast aluminum, round-bottomed groove than the flat-bottomed aluminum tank water filling. Round-bottomed groove than the flat-bottomed groove easy to mold manufacturing.

    7, the motor core slot width is not too large

    Motor notch is too small, offline difficult. Motor notch too. The air gap magnetic flux distribution uneven tooth harmonics increases. Additional losses increase. Notch width is generally semi-closed grooves 2-3 wires of diameter approximately 3.5mm. Low pressure forming the slot structure of the coil using the semi-section of the opening of the four components of the tank, so that the notch width is reduced by half the groove width.

    8, the number of stator slots not too much or too little

    Asynchronous motor stator slots, magnetic force, EMF waveform. Additional loss is small, the high efficiency of the motor. Number of slots, but also increases the contact area of the coil and the core, coil cooling, low temperature rise. Number of slots, core Ministry of teeth too narrow, stamping deformation process is poor. Slot number of the mold manufacturing cost increase, motor design, coil manufacturing and offline working hours in general. Number of stator slots, motor performance. But the cost is high.

    9, asynchronous motor to avoid using too large or too small air gap

    The air gap is the gap between the motor stator and rotor. The size of the air gap of the motor performance and manufacturing processes have a great impact. Air gap. Reluctance excitation ampere turns the motor excitation current increases. Motor power factor reduction. But the air gap Ambassador harmonic field weakening, the additional loss of the motor is reduced. The air gap is large, the motor parts the concentricity and assembling accuracy required to reduce; air gap is too small, easy to cause the stator and rotor sweep chamber, and leaving the motor efficiency is reduced due to the increase in additional loss.