The low-pressure high-power variable-frequency motor
The utility model relates to the electrical engineering field, relates in particular to a kind of low-pressure high-power variable-frequency motor.
Present most of low-pressure high-power adjustable frequency motor, mostly be permanent torque frequency control, frequency range is that 30Hz ~ 70Hz can not satisfy the requirement that the low-pressure high-power variable-frequency motor uses in some specific occasions, in addition, when frequency converter in when work, can produce high order harmonic component and give electrical machine insulation and motor bearings, cause the damage of motor bearings, therefore, understand reduced rate adjustable frequency motor power, reduce the operating efficiency of variable-frequency motor, even can shorten the useful life of motor.
The utility model content
At above-mentioned defective or deficiency, the utility model provides a kind of low-pressure high-power variable-frequency motor, can reduce the damage of high order harmonic component to motor and motor bearings, prolongs motor useful life.
For reaching above purpose, the utility model provides following technical scheme:
Comprise support, motor shaft and the rotor that is connected with motor shaft, rotor is provided with motor stator, and the two ends of described support are provided with end cap, offers through hole on the end cap, in through hole, and the unsupported end of bearing is arranged with first insulating case to motor shaft by Bearing Installation.
Described bearing is a ball bearing.
Described motor stator is wound with some circle coils outward.
The coil of described motor stator is set with second insulating case outward.
Described rotor both sides are installed the centrifugal blower that has air inlet and air outlet respectively, and the lower end of support is provided with the motor air outlet.
The air outlet place of described centrifugal blower is provided with deep bead.
The encoder that is used to measure motor speed is installed on the described motor shaft.
Described motor is outside equipped with outlet box.
The utility model provides a kind of low-pressure high-power variable-frequency motor; with motor shaft by Bearing Installation on the through hole of the end plate of support; and the unsupported end of bearing is arranged with first insulating case; this structure makes when the low-pressure high-power adjustable frequency motor rotates; produce high order harmonic component between isolated frequency converter generation and the motor; and then motor bearings played a protective role, prolong motor useful life.
Further, the utility model adopts ball bearing that motor shaft is installed, because ball bearing is made up of ball, interior ring, outer and retainer, wherein, ball is normally made with high chrome with ring, has high loadability, therefore, when motor is in the high frequency rotation, can satisfy the strong requirement of overload capacity.
Further, also be provided with the centrifugal blower that has air inlet and air outlet in the utility model and motor is carried out the forced ventilation mode cool off, guaranteed that motor can cool off fast, has guaranteed the fail safe of machine operation when high frequency moves.
Description of drawings
Fig. 1 is the structural representation of the low-pressure high-power variable-frequency motor that provides of the utility model.
Among the figure, 1 is bearing, and 2 is end cap, and 3 is support, and 4 is centrifugal blower, and 5 is outlet box, and 6 is motor stator, and 7 is rotor, and 8 is deep bead, and 9 is encoder, and 10 is the centrifugal blower air outlet.
Below in conjunction with accompanying drawing the utility model is done detailed description.
With reference to shown in Figure 1, the utility model provides a kind of low-pressure high-power variable-frequency motor, the employing frequency converter starts, this low-pressure high-power variable-frequency motor comprises: support 3, motor shaft and the rotor 7 that is connected with motor shaft, rotor 7 is provided with motor stator 6, be wound with some circle coils on the motor stator 6, in order to realize motor operate as normal when the high frequency, compared with prior art, the circle coil that twines on the motor stator 6 increases 2 times, so that motor when rotating electromagnetic field increase, and outside the coil of motor stator 6, be set with strengthened second insulating case, the reinforcement placement realizes by the back degree that changes second insulating case, when the motor that makes satisfies the requirement of the continuous variation of load, can also keep out the frequency converter harmonic wave to motor oscillating and The noise; The two ends of the support 3 of motor are provided with end cap 2, offer through hole on the end cap 2, motor shaft is installed in the through hole by bearing 1, and the encoder 9 that is used to measure motor speed is installed on the motor shaft, and the unsupported end of bearing 1 is arranged with first insulating case, wherein, described bearing 1 is a ball bearing, and encoder 9 is a photoelectric encoder, and, by the method for corresponding calculating and analysis, motor bearings structure and rotor critical speed are verified, it is guaranteed in the reliability operation.
Preferably, in order to guarantee that motor can normally dispel the heat when the high-frequency work, the centrifugal blower 4 that has air inlet and air outlet is installed respectively in rotor 7 both sides, the lower end of support 3 is provided with motor air outlet 10, air outlet 10 places of centrifugal blower 4 are provided with deep bead 8, and described motor also is provided with outlet box 5 outward.
The low-pressure high-power variable-frequency motor that the utility model provides is because to motor stator, motor bearings and cooling system improve, and have realized that machine operation speed adjustable range width can reach 5-150Hz; Secondly, constantly change the demanding problem of overload capacity at motor load, the insulating barrier of motor stator and bearing arrangement improved when motor was moved, and made motor when high frequency moves, still operate as normal, improve motor reliability running time, prolonged useful life; At last, under the condition of use capacity, installation site qualification, can make motor volume littler, performance is more superior.