ROTEK motor Germany ROTEK model ROTEK price

ROTEK motors are permanent magnet motors commutated or controlled by electronic circuits or current. Permanent magnet brushless motors come in two types: sine wave drive and square wave drive. Those with rectangular wave drive current are commonly referred to as permanent magnet brushless DC motors, while those with sine wave drive current are commonly referred to as permanent magnet AC servo motors. Based on sensor type, they can be classified into sensor-equipped motors and sensorless motors.

ROTEK motor operating principle

The motor has two windings: a starting winding and a running winding. These two windings are spatially displaced by 90 degrees. A capacitor with larger capacitance is connected in series with the starting winding. When single-phase AC power is applied to the running and starting windings, the capacitor causes the current in the starting winding to lead the current in the running winding by 90 degrees in time, reaching its peak first. This creates two identical pulsating magnetic fields in time and space, generating a rotating magnetic field in the air gap between the stator and rotor. Under the influence of this rotating magnetic field, an induced current is generated in the motor rotor. The interaction between this current and the rotating magnetic field produces electromagnetic torque, causing the motor to rotate.

Basic meaning of ROTEK motor

A motor is what people commonly refer to today as a starter motor. It rotates the starter rotor by passing current through coils in a magnetic field. The small gear on the rotor drives the engine flywheel, which in turn rotates the crankshaft to start the vehicle. Two component innovations—the new low-cost spark plug with a porcelain base and the starter—laid the technical foundation for automotive development. The electric starter replaced the heavy and dangerous hand crank, making driving safer, easier, and more convenient, and it was particularly favored by a broad new consumer base, including women. At the time, Henry Leland, manager of General Motors' Cadillac division, immediately recognized the potential of this technological achievement and quickly adopted it as standard equipment on the company's 1912 version Cadillac models. This Cadillac consequently became known as the "car without a crank." The introduction of the electric starter is still widely regarded as the most influential automotive innovation of the twentieth century.

ROTEK motor braking methods

Electrical braking methods for motors include: dynamic braking, plugging, and regenerative braking. (1) In dynamic braking, the three-phase AC power supply to the motor is disconnected, and DC power is applied to the stator winding. At the moment the AC power is cut off, due to inertia, the motor continues to rotate in the original direction. This method is characterized by smooth braking but requires a DC power source. For high-power motors, the cost of the required DC equipment is high, and the braking force is low at low speeds. (2) Plugging is divided into load plugging and power supply plugging. Load plugging, also known as reverse torque braking under load, allows heavy loads to descend slowly at a stable speed. The characteristics of this braking method are: the power supply does not need to be reversed, no special braking equipment is required, and the braking speed can be adjusted. However, it is only applicable to wound-rotor motors, where a large resistance must be inserted in series into the rotor circuit to make the slip greater than 1. In power supply plugging, when the motor needs to be braked, any two phase power lines are swapped to reverse the rotating magnetic field, resulting in rapid braking. When the motor speed reaches zero, the power is immediately cut off. The characteristics of this method are: quick stopping and strong braking force without the need for braking equipment. However, due to the high current during braking, the impact is also significant, which can easily cause the motor to overheat or damage components in the transmission system. Regenerative braking, also known as feedback braking, occurs when the motor speed exceeds the synchronous speed of the rotating magnetic field under the action of a heavy load (such as when a crane motor lowers a load). At this point, an induced current is generated in the rotor conductors, producing a torque opposite to the direction of rotation under the influence of the rotating magnetic field. However, since the motor speed is high, a speed reduction device is required.

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