A method for instantaneously boosting peak power of a motor

Abstract

The application provides a method for instantaneously improving the peak power of a motor, which lowers the direct-axis current (id), increases the quadrature-axis current (iq) and widens the working characteristic curve of the motor by means of pumping voltage without changing the peak phase current, so that the instantaneously improved peak power of the motor is realized, the response speed of the system is improved and the response time of the system is reduced. Through the adjustment of the control method, the motor can be designed according to the conventional working power, so that the volume of the motor is reduced, the weight of the motor is reduced and the goal of reducing cost and increasing benefit is achieved.

Description

Technical Field

[0001] This invention relates to the field of automobile chassis, and more particularly to a method for instantaneously increasing the peak power of a motor. Background Technology

[0002] With the increasing prevalence of intelligent vehicles and electric vehicles, the demands on the intelligence of chassis systems are rising. The motors required by chassis systems share a common characteristic: under normal operating conditions, the required motor output power is relatively low, and normal operating conditions account for a very high proportion of the entire working cycle; however, some special operating conditions, which account for a very small proportion, require high instantaneous motor output power, fast motor response speed, and extremely short operating times. In these special operating conditions, the required motor output power often needs to be approximately 1.3 to 2 times that of normal operating conditions.

[0003] The design of a chassis system needs to meet both standard operating conditions and a few special operating conditions. Therefore, the motor output must be designed according to these special conditions. When the chassis system is operating under standard conditions, it may be overpowered, resulting in wasted system resources.

[0004] When designing existing chassis systems, the magnetic circuit design of the motor is based on the peak power required for a very small proportion of special operating conditions. This design scheme can meet the needs of both special and conventional operating conditions at the same time.

[0005] The main drawback of existing technologies is that special operating conditions account for a very small percentage of the product's lifecycle. During these special conditions, the motor requires both high output power and high speed. Conventional designs employ field weakening control, adjusting the direct-axis current (id) to weaken the field and the quadrature-axis current (iq) to adjust the output torque. However, this adjustment is limited by the system's phase current. Therefore, the motor design can only be tailored to meet the peak power point requirements of these special operating conditions. But under normal operating conditions, the motor operates under low load most of the time, and only a very small percentage under medium load, meaning the motor is often overpowered. Existing designs are wasteful in terms of both weight and cost. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a method for instantaneously increasing the peak power of a motor. Under normal conditions, the motor operates at the vehicle body power supply voltage. Under special operating conditions, the entire motor power supply voltage is boosted by hardware circuitry. With the voltage increased, and assuming the phase current remains constant, the id current requirement at the same speed will decrease in the motor's weak magnetic region. While maintaining the total peak current, the iq current used to generate torque can be increased, thereby increasing the motor's output torque and altering its operating characteristic curve, widening its operating characteristic range. This method of adjusting the operating voltage divides the motor's operating area into two zones: the vehicle body power supply voltage operating zone and the boosted voltage operating zone under special operating conditions. During motor design, the entire motor scheme is designed according to normal operating conditions. Under special operating conditions, the voltage is boosted to operate the motor in the boosted voltage operating zone, instantly increasing the motor's peak output power and achieving rapid response. Once the special operating condition target is achieved, the motor can switch back to the vehicle body power supply voltage operating zone.

[0007] The purpose of this invention is to provide a method for instantaneously increasing the peak power of a motor. The motor operates in two voltage operating zones, including the vehicle body power supply voltage operating zone and the pump-up voltage operating zone. When the motor is in the pump-up voltage operating zone, by adjusting the bus voltage, the direct-axis current (id) of the motor is reduced and the quadrature-axis current (iq) is increased, thereby improving the torque output capability and instantaneously increasing the peak power of the motor, thus achieving the purpose of improving the motor response speed.

[0008] Further improvements include: under normal operating conditions, the motor operates within the operating range of the vehicle body power supply voltage;

[0009] Further improvements include: under special operating conditions, the power supply to the motor is boosted by hardware-pumped voltage, which instantly changes the operating range of the motor's operating characteristic curve. Once the special operating conditions are completed, the operating range is switched back to the vehicle body power supply voltage range.

[0010] Further improvements are made by designing a smaller power motor for normal operating conditions. However, under special operating conditions, the existing output power is insufficient. By instantaneously increasing the supply voltage, the motor can operate in the pump-up voltage operating range, thus widening the motor's operating characteristic curve to meet the system's requirements.

[0011] The beneficial effects of this invention are:

[0012] 1. Improve system response time:

[0013] By boosting the voltage, the demand for direct-axis current (id) is reduced without changing the peak phase current, while the regulation capability of quadrature-axis current (iq) is increased. This broadens the operating characteristic curve of the motor, thereby increasing the instantaneous peak power of the motor, which in turn improves the system's response speed and reduces the system's response time.

[0014] 2. Cost reduction and efficiency improvement:

[0015] By adjusting the control method, the motor can be designed according to the power of normal operating conditions, thereby reducing the size and weight of the motor and achieving the goal of cost reduction and efficiency improvement. Attached Figure Description

[0016] Figure 1 This is the system architecture diagram of the present invention.

[0017] Figure 2 This is a graph showing the operating characteristics of the motor in this invention. Detailed Implementation

[0018] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0019] like Figure 1 and 2 As shown, this embodiment provides a method for instantaneously increasing the peak power of a motor. The motor operates in two voltage operating zones, including the vehicle body power supply voltage operating zone and the pump-up voltage operating zone. When the motor is in the pump-up voltage operating zone, by adjusting the bus voltage, the direct-axis current (id) of the motor is reduced and the quadrature-axis current (iq) is increased, thereby improving the torque output capability and instantaneously increasing the peak power of the motor, thus achieving the purpose of improving the motor response speed.

[0020] Under special operating conditions, the power supply to the motor is boosted by hardware pumping voltage, which instantly changes the operating range of the motor's operating characteristic curve. Once the special operating conditions are completed, the operating range of the vehicle body power supply voltage is switched back.

[0021] The motor is designed for relatively small power under normal operating conditions. However, under special operating conditions, the existing output power is insufficient. By instantaneously increasing the supply voltage, the motor can be made to operate in the pump-up voltage operating range, thus widening the motor's operating characteristic curve to meet the system requirements.

[0022] The motor's operating range is divided into two zones. When operating at the vehicle's power supply voltage, the motor operates under normal conditions. When the motor needs to perform special operating conditions, the input voltage is boosted, causing the motor to instantly switch to the boosted voltage operating zone. By boosting the voltage, the direct-axis current (id) is reduced while the quadrature-axis current (iq) is increased without increasing the phase current, thereby increasing the power.

[0023] Improve system response time:

[0024] By boosting the voltage, without changing the peak phase current, the direct-axis current (id) is reduced and the quadrature-axis current (iq) is increased, thus widening the motor's operating characteristic curve and achieving an instantaneous increase in the motor's peak power. This improves the system's response speed and reduces the system's response time.

[0025] Cost reduction and efficiency improvement:

[0026] By adjusting the control method, the motor can be designed according to the power of normal operating conditions, thereby reducing the size and weight of the motor and achieving the goal of cost reduction and efficiency improvement.

Claims

1. A method for instantaneously increasing the peak power of a motor, characterized in that: The motor operates in two voltage operating regions: the vehicle body power supply voltage operating region and the pump-up voltage operating region. When the motor is in the pump-up voltage operating region, by adjusting the bus voltage, under the premise that the phase current remains unchanged, the direct-axis current (id) of the motor is reduced and the quadrature-axis current (iq) is increased in the motor's field weakening region. This increases the torque output capability while keeping the total peak current constant, instantly increasing the motor's peak power. This changes the motor's operating characteristic curve, widens the operating characteristic region, and achieves the purpose of improving the motor's response speed.

2. The method for instantaneously increasing the peak power of a motor according to claim 1, characterized in that: Under normal operating conditions, the motor operates within the voltage range of the vehicle body power supply.

3. The method for instantaneously increasing the peak power of a motor according to claim 1, characterized in that: Under special operating conditions, the power supply to the motor is increased by hardware-pumped voltage, which instantly changes the motor's operating characteristic curve.

4. The method for instantaneously increasing the peak power of a motor according to claim 1, characterized in that: The motor is designed for relatively small power under normal operating conditions. However, under special operating conditions, the existing output power is insufficient. By instantaneously increasing the supply voltage, the motor can be made to operate in the pump-up voltage operating range, thus widening the motor's operating characteristic curve to meet the system requirements.

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