1. The torque motor test bench is a planar permanent magnet DC motor with multiple poles. In order to reduce torque ripple and speed ripple, the number of slots, commutator segments, and series conductors in the armature are increased. There are two types of torque motors, one is DC torque motor, and the other is AC torque motor. In this case, the self inductance reactance of the DC torque motor is very low, therefore it has good response capability; Its output torque is independent of the rotor speed and position, and directly related to the input current; When approaching blockage, there is no need for gear reduction to connect with the load, thus generating a large torque to inertia ratio on the load shaft and effectively overcoming system errors caused by reduction gears. AC torque motors can also be divided into synchronous motors and asynchronous motors, among which squirrel cage asynchronous motors are mainly low-speed high torque motors. Normally, in the textile industry, the working principle and structure of AC torque motors are basically the same as single-phase asynchronous motors, but due to their high resistance, they have soft mechanical properties.
2. The reluctance motor test bench is a new type of variable speed motor, which has a very simple, sturdy structure, low cost, fast speed, and is a strong competitor to traditional control motors with great market prospects. However, due to motor torque pulsation, operating noise, and large vibration, it takes some time to optimize and improve to meet market demand.
3. The brushless DC motor test bench (BLDCM) is developed based on brushed DC motors, but its driving current is entirely AC; Brushless DC motors can be divided into brushless motors and brushless motors. Normally, the driving current of a brushless motor is divided into trapezoidal waves (commonly referred to as "square waves") and sine waves. Sometimes, the former is called a DC brushless motor, while the latter is called an AC servo motor. Brushless DC motors generally adopt a "slender" structure to reduce their inertia. Compared with brushed DC motors, it has much smaller weight and volume, and its inertia performance is reduced by 40% to 50%. Due to manufacturing process issues with permanent magnet materials, the power of a typical brushless DC motor does not exceed 100kW. This electric motor has good mechanical and adjustment performance, with advantages such as a good speed range, long service life, simple maintenance, low noise, and no brushes. Therefore, it has a wide range of application prospects.