EMZ Elektro motor Germany EMZ Elektro model EMZ Elektro price

EMZ Elektro motors are permanent magnet motors commutated or controlled by electronic circuits. 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 sensored motors and sensorless motors.

EMZ Elektro motor energy-saving measures

Measures to improve motor efficiency. Motor energy saving is a systematic project involving the full life cycle of the motor, from design and manufacturing to selection, operation, adjustment, maintenance, and disposal. The effectiveness of energy-saving measures must be considered over the entire life cycle of the motor. Domestically and internationally, the main focus in this area is on improving motor efficiency from the following aspects. Energy-efficient motor design refers to the use of modern design methods such as optimization design technology, new material technology, control technology, integration technology, and testing technology to reduce power loss and improve efficiency, thereby designing high-efficiency motors. While converting electrical energy into mechanical energy, the motor itself also loses a portion of energy. Typical AC motor losses are generally divided into three parts: fixed losses, variable losses, and stray losses. Variable losses change with load and include stator resistance loss (copper loss), rotor resistance loss, and brush resistance loss. Fixed losses are independent of load and include core loss and mechanical loss. Core loss consists of hysteresis loss and eddy current loss, which are proportional to the square of the voltage; hysteresis loss is also inversely proportional to frequency. Other stray losses include mechanical losses and other losses, such as bearing friction loss and windage loss caused by the rotation of fans, rotors, etc.

EMZ Elektro motor classification

Motors are classified by the supply method of excitation current. Permanent magnet synchronous motors are synchronous motors that use permanent magnets to establish the excitation magnetic field; the stator generates a rotating magnetic field, and the rotor is made of permanent magnet material. Synchronous motors require a DC magnetic field for energy conversion; the DC current producing this field is called the motor's excitation current. Separately excited motors obtain excitation current from another power source. Self-excited motors obtain excitation current from the motor itself. Classified by supply frequency, permanent magnet brushless motors include permanent magnet brushless DC motors and permanent magnet brushless AC motors; both require variable frequency power supply when operating as motors. The former requires only a square wave inverter, while the latter requires a sine wave inverter. Classified by air gap magnetic field distribution: Sine wave permanent magnet synchronous motor: The magnetic poles use permanent magnet material. When three-phase sine wave current is input, the air gap magnetic field distributes according to a sine law, abbreviated as permanent magnet synchronous motor. Trapezoidal wave permanent magnet synchronous motor: The magnetic poles still use permanent magnet material, but square wave current is input, resulting in a trapezoidal distribution of the air gap magnetic field, with performance closer to that of a DC motor. A self-controlled variable frequency synchronous motor constructed with a trapezoidal wave permanent magnet synchronous motor is also known as a brushless DC motor.

EMZ Elektro motor structure

The motor electronic commutation circuit consists of two main parts: the power conversion circuit and the control circuit. Working in conjunction with position sensors, it controls the energization sequence and timing of each phase winding of the motor stator, performing a function similar to mechanical commutation. During system operation, the power converter accepts control information from the control circuit and distributes power from the system work supply to each phase winding on the stator of the BLDCM according to a certain logical relationship, enabling the motor to generate continuous torque. The inverter converts DC current into AC current to supply the motor. Unlike general inverters, its output frequency is not independently adjusted but is controlled by the rotor position signal, making it a "self-controlled inverter." Permanent magnet brushless motors BLDCM utilize a self-controlled inverter, ensuring that the frequency of the motor input current remains synchronized with the motor speed. Consequently, the motor and inverter do not experience oscillation or loss of synchronism, which is one of the significant advantages of permanent magnet brushless motors BLDCM. Electric vehicle motor The energization sequence and timing of each motor winding mainly depend on signals from position sensors. However, signals generated by the position sensor generally cannot directly drive the power switching elements of the power converter. They often require logical processing and isolation via the control circuit before driving the switching elements of the power converter. The function of the driver circuit is to process the rotor position signals detected by the position sensor and output them according to a specific logic code to trigger the power switching transistors.

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