1200w Sine wave and square wave motor comparison

Rotor

Weight

Curve

Difference

The magnetic steel is sine wave magnetization, the back electromotive force is also sine wave, and the current is also sine wave. A power cycle generally has at least 18 vectors. A higher performance MCU or DSP is required to achieve this. 1 kw/1.2 kw/1.5 kw/2 kw SVPWM controlling, over that FOC controlling.

The magnetic steel is square wave magnetization, the control voltage PWM is also square wave, and the current is also square wave. There are six space vectors in one electrical cycle. Simple control and low cost. Ordinary MCU can control it.

Advantage

1. Low noise. 2, linear general wave controller is good. 3. The waveform is more in line with the working principle of the motor, and the motor efficiency is higher under climbing or heavy load acceleration. Sine wave voltage utilization rate is about 85%~95%, with weak magnetic function, the speed can run higher. 4. Low heat

Advantages: 1, simple matching, more reliable controller; 2, the price is cheap, there is a large choice of space; 3, cruise relative to the sine wave controller to save power; 4, can improve the acceleration; 5, EABS braking effect is better than sine wave controller; 6, cannot need weak magnetic can directly run out of the motor speed, high voltage utilization.

Disadvantage

The price is higher than the wave controller. Need technique to match the motor with controller

Disadvantages: 0-5km/h starting vibration; Loud noise; Some controllers are not linear and easy to punch; Not smart enough, basically adjustable after the factory; The motor efficiency of acceleration and heavy load is low.

RPM

Under the voltage of 60v, the speed of the motor can be increased to 3700 to 4000 RPM, the higher the speed, the smaller the torque. Motor speed adjustment is convenient

Under the voltage of 60v, the speed is about 3000 to 3300 RPM, and the speed cannot be adjusted

Conclusion

Through the above comparison, the square wave and sine wave controller of electric vehicle have advantages and disadvantages. With the change of consumer demand, the electric vehicle sine wave controller has more advantages in the market because of its ultra-quiet, energy-saving and environmental protection advantages. Flexible speed adjustment.

At present, the shipments of square wave motors to the Indian market are still large, plus the previous stock. The volume of square wave motor is still very large.