The advantages and disadvantages of the motor
1., permanent magnet synchronous motor characteristics: permanent magnet synchronous motor is simple in structure, small in size, light in weight, small in loss and high in efficiency. Compared with DC motor, it has no disadvantages such as commutator and brush of DC motor. Compared with the induction motor, because it does not require reactive excitation current, high efficiency, high power factor and torque inertia ratio, reducing the consumption of stator current and stator resistance, rotor parameters can be measured, and the control performance is good; but it is also compared with the induction motor, the disadvantages of high cost, difficult to start etc.. Compared with ordinary synchronous motor, it eliminates the excitation device, to simplify the structure, improve the efficiency of. Permanent magnet synchronous motor vector control system can achieve high accuracy, high dynamic performance and wide range of speed control or location control. Therefore, permanent magnet synchronous motor vector control system has attracted wide attention of scholars at home and abroad.
The characteristic of 2. reluctance synchronous motor is that the structure is simple, the rotor has no electromagnetic loss, and it can avoid the noise of switched reluctance motor and the torque ripple in low speed operation.
3. features: 1) hysteresis synchronous motor self starting, and stable synchronization, without starting windings or other starting device. 2) the rotor has no magnetic pole structure, nor needs to be magnetized in advance. The magnetic pole is magnetized by the stator rotating magnetic field, so it is easy to design a multipole motor. 3) from starting, running to entering synchronization, from no-load operation to the maximum output synchronous torque, the input current is almost constant, but the power factor is low. 4) without sliding contact, the motor structure is simple, the cost is low, the operation is reliable, the mechanical strength is high, and the operation noise is small.
4., three-phase asynchronous motor features: advantages: compared with single-phase asynchronous motor, three-phase asynchronous motor is simple in structure, easy to manufacture, good in operation performance, and can save all kinds of materials, and the price is cheap. Shortcomings: the power factor lag, the light load power factor is low, the speed regulation performance is slightly poor.
5., the characteristics of the unidirectional asynchronous motor are: the power supply is convenient, the structure is simple, the price is low, and the operation is reliable. It is widely used in offices, families and hospitals, such as single phase power supply.
6. hood asynchronous motor features: the hood type AC motor is simple in structure, low in production cost and less in operation noise.
7. single-phase series motor characteristics: whether using DC power or AC power, the mechanical characteristics of single-phase series motor are similar to the mechanical characteristics of common series DC motor. Single phase series excited motor has great starting torque and soft mechanical characteristics. Because of its high speed, small volume, high starting torque and adjustable speed, it can be used both in DC power supply and in single-phase AC power supply, so it has been widely applied in electric tools.
The characteristics of 8. AC and DC motor are: the internal structure of AC and DC motor is not very different from the pure DC motor. All of them are driven by electric brush through the steering electric appliance, and the current is input into armature winding, and its magnetic field is in series form with the armature winding. Dual motor steering switch is very convenient, as long as the switch will coil reverse, which can realize the motor rotor and the clockwise reverse.
9. features: a repulsion motor single-phase AC motor commutator. The stator windings are powered by a single phase, and the rotor is a loan. A structure of the repulsion motor (a brush) in the stator windings) can brush brush armature winding short circuit with a commutator.