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山东无刷直流电机生产结构及特点介绍

来源:http://www.jnmcd.com 发布时间:2019-04-08 浏览:
直流无刷电机是同步电机的一种,也就是说电机转子的转速受电机定子旋转磁场的速度及转子极数(p)影响:n=60.f/p。直流无刷电机在转子极数固定状况下,改动定子旋转磁场的频率就能够改动转子的转速。直流无刷电机即是将同步电机加上电子式控制(驱动器),控制定子旋转磁场的频率并将电机转子的转速回授至控制中心重复校正,以期到达接近直流电机特性的方式。也就是说直流无刷电机可以在额定负载范围内当负载变化时仍能够控制电机转子维持一定的转速。
Brushless DC motor is a kind of synchronous motor, that is to say, the speed of motor rotor is affected by the speed of stator rotating magnetic field and the number of rotor poles (p): n = 60.f/p. When the pole number of the rotor is fixed, the rotor speed can be changed by changing the frequency of the stator rotating magnetic field. Brushless DC motor is a synchronous motor plus electronic control (driver), which controls the frequency of stator rotating magnetic field and feeds the speed of motor rotor back to the control center for repetitive correction, in order to reach the way close to the characteristics of DC motor. That is to say, the brushless DC motor can control the motor rotor to maintain a certain speed when the load changes in the rated load range.
直流无刷驱动器包括电源部及控制部:电源部提供三相电源给电机,控制部则依需求转换输入电源频率。电源部能够直接以直流电输入(普通为24v)或以交流电输入(110v/220v),假如输入是交流电就得先经转换器(converter)转成直流。不管是直流电输入或交流电输入要转入电机线圈前须先将直流电压由换流器(inverter)转成3相电压来驱动电机。
The DC brushless driver includes power supply and control unit: the power supply provides three-phase power supply to the motor, and the control unit converts the input power frequency according to the demand. The power supply can be directly input by direct current (usually 24v) or by alternating current (110v/220v). If the input is alternating current, it must be converted to direct current by converter. Whether DC or AC input is to be converted into motor coil, the DC voltage must be converted from a converter to a three-phase voltage to drive the motor.
换流器(inverter)普通由6个功率晶体管(q1~q6)分为上臂(q1、q3、q5)/下臂(q2、q4、q6)衔接电机作为控制流经电机线圈的开关。控制部则提供pwm(脉冲宽度调制)决议功率晶体管开关频度及换流器(inverter)换相的机遇。
Converter (Inverter) is generally divided into six power transistors (q1-q6) which are connected by upper arm (q1, q3, q5)/lower arm (q2, q4, q6) motor as a switch to control the flow through the motor coil. The control unit provides the opportunity for PWM (pulse width modulation) to determine the switching frequency of power transistors and commutation of converters.
山东无刷电机
直流无刷电机普通希望运用在当负载变动时速度能够稳定于设定值而不会变动太大的速度控制,所以直流无刷电机内部装有能感应磁场的霍尔传感器(hall-sensor),做为速度之闭回路控制,同时也做为相序控制的根据。但这只是用来做为速度控制并不能拿来做为定位控制。
DC brushless motor usually hopes to use speed control which can be stabilized at the set value without too much change when the load changes. So Hall-sensor is installed inside the brushless DC motor, which can induce magnetic field, as the closed-loop control of speed, and as the basis of phase sequence control. But this is only used as speed control and not as positioning control.
直流无刷电机特性
Characteristics of DC Brushless Motor
1、直流无刷电机可替代直流电机调速、变频器+变频电机调速、异步电机+减速机调速;
1. DC brushless motor can replace DC motor speed regulation, frequency converter + frequency converter motor speed regulation, asynchronous motor + reducer speed regulation;
2、直流无刷电机具有传统直流电机的优点,同时又取消了碳刷、滑环构造;
2. The brushless DC motor has the advantages of traditional DC motor, while the structure of carbon brush and sliding ring is cancelled.
3、直流无刷电机能够低速大功率运转,能够省去减速机直接驱动大的负载;
3. The brushless DC motor can operate at low speed and high power, which can save the heavy load directly driven by the reducer.
4、直流无刷电机体积小、重量轻、出力大;
4. DC brushless motor has small volume, light weight and large output.
5、直流无刷电机转矩特性优良,中、低速转矩性能好,启动转矩大,启动电流小;
5. DC brushless motor has excellent torque characteristics, good middle and low speed torque performance, large starting torque and small starting current.
6、直流无刷电机无级调速,调速范围广,过载才能强;
6. DC brushless motor stepless speed regulation, wide range of speed regulation, overload can be strong;
7、直流无刷电机软启软停、制动特性好,可省去原有的机械制动或电磁制动安装;
7. The brushless DC motor has good soft start, soft stop and braking characteristics, which can eliminate the original mechanical braking or electromagnetic braking installation.
8、直流无刷电机效率高,电机自身没有励磁损耗和碳刷损耗,消弭了多级减速耗,综合节电率可达20%~60%。
8. DC brushless motor has high efficiency, no excitation loss and carbon brush loss, eliminating multi-stage deceleration loss, and the comprehensive power saving rate can reach 20%~60%.
9、直流无刷电机牢靠性高,稳定性好,顺应性强,维修与颐养简单;
9. DC brushless motor has high reliability, good stability, strong adaptability and simple maintenance.
10、直流无刷电机耐平稳震动,噪音低,震动小,运转平滑,寿命长;
10. DC brushless motor can withstand stable vibration, low noise, small vibration, smooth operation and long service life.
11、直流无刷电机不产生火花,特别合适爆炸性场所,有防爆型;
11. DC brushless motor does not produce sparks, especially suitable for explosive places, with explosion-proof type;
12、直流无刷电机依据需求可选梯形波磁场电机和正弦波磁场电机。
12. DC brushless motor can choose trapezoidal wave magnetic field motor and sinusoidal wave magnetic field motor according to demand.
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