The impact of the frequency converter on the deceleration motor and a few requirements to pay attention to.
Regarding the impact of frequency converters on reduction motors and some requirements to pay attention to, let me share some insights.
Release time:
2022-08-11 15:27
1,Reduction MotorThe efficiency and temperature rise issues of electric motors
Regardless of the form of the inverter reduction motor, different degrees of harmonic voltage and current will be generated during operation. Higher harmonics can lead to increased copper consumption in the stator, rotor copper (aluminum), iron, and additional losses in the motor. When higher harmonic voltages cut off the rotor guide plate at larger differentials, significant rotor losses occur. Additionally, the increased copper consumption due to the skin effect should be considered. These losses will cause the motor to generate extra heat, reduce efficiency, and lower output power.
2. Insulation strength issues of reduction motors
Many use PWM control methods. The carrier frequency is about several thousand to tens of thousands of hertz, currently for small and medium-sized inverters. This allows the motor stator windings to withstand higher voltage rise rates, which equates to applying steep impulse voltages to the motor, thereby putting the inter-turn insulation of the motor to a more severe test.
3. Basic requirements for the working environment of single-phase speed-regulating motor inverters
Due to the use of high-voltage IGBT and other power devices in the inverter part of high-voltage inverters, their switching frequency is greater than 100Hz, which easily forms high-order harmonic currents, causing the inverter devices to generate a certain amount of heat during operation. Typically, an exhaust fan is installed at the top of the inverter cabinet to expel heat from the cabinet into the room, which continuously raises the indoor environmental temperature, ultimately affecting the reliable operation of various devices in the cabinet.
4. Technical improvement of the control of the circuit breaker at the outlet of the high-voltage power supply system for single-phase speed-regulating motors
The high-voltage side of the transformer used in the frequency conversion speed regulation device should be directly connected to the switching equipment in the high-voltage system, but the protection range of the switching equipment only covers the short circuit between the power supply line and the low-voltage side of the transformer. The faults of the inverter should be handled by the detection and protection system of the inverter itself.
5. Revisions of the characteristic tests and technical specifications of single-phase speed-regulating motors
When ordinary motors use frequency conversion power supply, the harmonic components of the voltage and current output by the inverter will increase the losses of the motor, reduce efficiency, and raise the temperature. The increase in losses caused by high-order harmonics is mainly manifested as increased copper consumption, iron losses, and additional losses in the stator and rotor. Among these, the rotor copper consumption is the largest because the asynchronous motor always operates in a state where the slip is close to 1, resulting in very high rotor copper consumption. In ordinary asynchronous motors, in order to improve the starting performance of the motor, the skin effect of the rotor increases the actual impedance, thereby increasing copper consumption.
6. Key points for selecting and laying power cables for single-phase speed-regulating motors
Since the connection between the inverter output and the motor is a cable connection, and each phase of the line has a capacitance to ground, the capacitive currents on the line are not equal. If the cable connection distance is long and there are high-order harmonic currents in the line, once a single-phase ground fault occurs, the arc extinguishing time caused by the fault capacitive current can be too long, causing the cable to heat up at this end, resulting in fault-free insulation.
SailentHaving deep experience in the small modulus gear industry and micro precision planetary gearbox industry for many years, with a stable technical team and profound technical accumulation, it is a national high-tech enterprise, having obtained more than 30 patents, and can provide customers with precision small modulus gears, micro precision planetary gearboxes, and overall solutions for DC reduction motors. It has gained the trust of customers and has a good reputation, worthy of your trust.
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Introduction to Micro DC Gear Motors
Introduction to Micro DC Gear Motors Micro DC gear motors are a miniaturized motor system, typically consisting of a DC motor and a gearbox. Here are some related introductions to micro DC gear motors: DC Motor Section: Working Principle: The DC motor generates current by moving a conductive coil in a magnetic field, thus producing electromagnetic force to drive the motor's rotation. Structure: Micro DC motors usually adopt a separate structure, including an armature (rotating part) and an electromagnet (stator part). Types: Common types of DC motors include brushed DC motors and brushless DC motors. Brushed DC motors use brushes to connect to the armature, while brushless DC motors control current through an electronic speed controller, eliminating the need for brushes. Gearbox Section: Function: The gearbox is used to slow down the motor's output speed while increasing torque. This is crucial for applications requiring higher torque and lower speeds, such as robotic arms and camera gimbals. Structure: Gearboxes typically consist of gears that achieve the reduction ratio through different gear combinations. The reduction ratio is the ratio of input speed to output speed. Types: Common types of gearboxes include planetary gears, worm gears, and helical gears. Different types of gearboxes are suitable for different application scenarios. Applications: Micro DC gear motors are widely used in various fields, including consumer electronics (such as cameras and printers), medical devices, robotics, and automotive electronics. In these applications, micro DC gear motors are typically used to control precise movements, provide sufficient torque, and achieve efficient performance in limited spaces. Control and Drive: Micro DC gear motors usually require corresponding electronic speed controllers or controllers to precisely control rotation speed and direction. The control system can adjust the motor's output according to application needs, achieving precise position control and speed regulation. Performance Parameters: The performance parameters of micro DC gear motors include rated voltage, rated speed, rated torque, efficiency, etc. These parameters are crucial for selecting and designing motor systems. In summary, micro DC gear motors have been widely applied under the trends of miniaturization, precision, and efficiency, providing reliable driving force for many electric devices and systems.
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